ENGINE CONTROL SYSTEM (2GR-FE) (DIAGNOSTIC CODES (P0010-P0340) & CIRCUIT TESTS)

• HEADINGS
  • SFI SYSTEM
    • DTC P0010: Camshaft Position "A" Actuator Circuit (Bank 1); DTC P0020: Camshaft Position "A" Actuator Circuit (Bank 2)
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • COMPONENT OPERATING RANGE
      • WIRING DIAGRAM
      • CONFIRMATION DRIVING PATTERN
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P0011: Camshaft Position "A" - Timing Over-Advanced or System Performance (Bank 1); DTC P0012: Camshaft Position "A" - Timing Over-Retarded (Bank 1); DTC P0021: Camshaft Position "A" - Timing Over-Advanced or System Performance (Bank 2); DTC P0022: Camshaft Position "A" - Timing Over-Retarded (Bank 2)
      • CAUTION / NOTICE / HINT
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • WIRING DIAGRAM
      • CONFIRMATION DRIVING PATTERN
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P0013: Camshaft Position "B" Actuator Circuit / Open (Bank 1); DTC P0023: Camshaft Position "B" Actuator Circuit / Open (Bank 2)
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • COMPONENT OPERATING RANGE
      • WIRING DIAGRAM
      • CONFIRMATION DRIVING PATTERN
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P0014: Camshaft Position "B" - Timing Over-Advanced or System Performance (Bank 1); DTC P0015: Camshaft Position "B" - Timing Over-Retarded (Bank 1); DTC P0024: Camshaft Position "B" - Timing Over-Advanced or System Performance (Bank 2); DTC P0025: Camshaft Position "B" - Timing Over-Retarded (Bank 2)
      • CAUTION / NOTICE / HINT
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • WIRING DIAGRAM
      • CONFIRMATION DRIVING PATTERN
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P0016: Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A); DTC P0018: Crankshaft Position - Camshaft Position Correlation (Bank 2 Sensor A)
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • WIRING DIAGRAM
      • CONFIRMATION DRIVING PATTERN
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P0017: Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor B); DTC P0019: Crankshaft Position - Camshaft Position Correlation (Bank 2 Sensor B)
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • WIRING DIAGRAM
      • CONFIRMATION DRIVING PATTERN
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P0031: Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1); DTC P0032: Oxygen (A/F) Sensor Heater Control Circuit High (Bank 1 Sensor 1); DTC P0051: Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 2 Sensor 1); DTC P0052: Oxygen (A/F) Sensor Heater Control Circuit High (Bank 2 Sensor 1); DTC P101D: A/F Sensor Heater Circuit Performance Bank 1 Sensor 1 Stuck ON; DTC P103D: A/F Sensor Heater Circuit Performance Bank 2 Sensor 1 Stuck ON
      • CAUTION / NOTICE / HINT
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • COMPONENT OPERATING RANGE
      • MONITOR RESULT
      • WIRING DIAGRAM
      • CONFIRMATION DRIVING PATTERN
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P0037: Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2); DTC P0038: Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 2); DTC P0057: Oxygen Sensor Heater Control Circuit Low (Bank 2 Sensor 2); DTC P0058: Oxygen Sensor Heater Control Circuit High (Bank 2 Sensor 2); DTC P0141: Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 2); DTC P0161: Oxygen Sensor Heater Circuit Malfunction (Bank 2 Sensor 2); DTC P102D: O2 Sensor Heater Circuit Performance Bank 1 Sensor 2 Stuck ON; DTC P105D: O2 Sensor Heater Circuit Performance Bank 2 Sensor 2 Stuck ON
      • CAUTION / NOTICE / HINT
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • COMPONENT OPERATING RANGE
      • MONITOR RESULT
      • WIRING DIAGRAM
      • CONFIRMATION DRIVING PATTERN
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P0101: Mass or Volume Air Flow Circuit Range / Performance Problem
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • WIRING DIAGRAM
      • CONFIRMATION DRIVING PATTERN
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P0102: Mass or Volume Air Flow Circuit Low Input; DTC P0103: Mass or Volume Air Flow Circuit High Input
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • COMPONENT OPERATING RANGE
      • WIRING DIAGRAM
      • CONFIRMATION DRIVING PATTERN
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P0111: Intake Air Temperature Sensor Gradient Too High
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • WIRING DIAGRAM
      • CONFIRMATION DRIVING PATTERN
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P0112: Intake Air Temperature Circuit Low Input; DTC P0113: Intake Air Temperature Circuit High Input
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • COMPONENT OPERATING RANGE
      • WIRING DIAGRAM
      • CONFIRMATION DRIVING PATTERN
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P0115: Engine Coolant Temperature Circuit; DTC P0117: Engine Coolant Temperature Circuit Low Input; DTC P0118: Engine Coolant Temperature Circuit High Input
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • COMPONENT OPERATING RANGE
      • WIRING DIAGRAM
      • CONFIRMATION DRIVING PATTERN
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P0116: Engine Coolant Temperature Circuit Range / Performance Problem
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • COMPONENT OPERATING RANGE
      • CONFIRMATION DRIVING PATTERN
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P011B: Engine Coolant Temperature / Intake Air Temperature Correlation
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • CONFIRMATION DRIVING PATTERN
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P0120: Throttle / Pedal Position Sensor / Switch "A" Circuit; DTC P0121: Throttle / Pedal Position Sensor / Switch "A" Circuit Range / Performance Problem; DTC P0122: Throttle / Pedal Position Sensor / Switch "A" Circuit Low Input; DTC P0123: Throttle / Pedal Position Sensor / Switch "A" Circuit High Input; DTC P0220: Throttle / Pedal Position Sensor / Switch "B" Circuit; DTC P0222: Throttle / Pedal Position Sensor / Switch "B" Circuit Low Input; DTC P0223: Throttle / Pedal Position Sensor / Switch "B" Circuit High Input; DTC P2135: Throttle / Pedal Position Sensor / Switch "A" / "B" Voltage Correlation
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • COMPONENT OPERATING RANGE
      • FAIL-SAFE
      • WIRING DIAGRAM
      • CONFIRMATION DRIVING PATTERN
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P0125: Insufficient Coolant Temperature for Closed Loop Fuel Control
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • WIRING DIAGRAM
      • CONFIRMATION DRIVING PATTERN
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
      • CAUTION / NOTICE / HINT
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • CONFIRMATION DRIVING PATTERN
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P0136: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2); DTC P0137: Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 2); DTC P0138: Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 2); DTC P0139: Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 2); DTC P0156: Oxygen Sensor Circuit Malfunction (Bank 2 Sensor 2); DTC P0157: Oxygen Sensor Circuit Low Voltage (Bank 2 Sensor 2); DTC P0158: Oxygen Sensor Circuit High Voltage (Bank 2 Sensor 2); DTC P0159: Oxygen Sensor Circuit Slow Response (Bank 2 Sensor 2)
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • COMPONENT OPERATING RANGE
      • MONITOR RESULT
      • WIRING DIAGRAM
      • CONFIRMATION DRIVING PATTERN
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P014C: A/F Sensor Slow Response - Rich to Lean Bank 1 Sensor 1; DTC P014D: A/F Sensor Slow Response - Lean to Rich Bank 1 Sensor 1; DTC P014E: A/F Sensor Slow Response - Rich to Lean Bank 2 Sensor 1; DTC P014F: A/F Sensor Slow Response - Lean to Rich Bank 2 Sensor 1; DTC P015A: A/F Sensor Delayed Response - Rich to Lean Bank 1 Sensor 1; DTC P015B: A/F Sensor Delayed Response - Lean to Rich Bank 1 Sensor 1; DTC P015C: A/F Sensor Delayed Response - Rich to Lean Bank 2 Sensor 1; DTC P015D: A/F Sensor Delayed Response - Lean to Rich Bank 2 Sensor 1
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • MONITOR RESULT
      • CONFIRMATION DRIVING PATTERN
      • WIRING DIAGRAM
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P0171: System Too Lean (Bank 1); DTC P0172: System Too Rich (Bank 1); DTC P0174: System Too Lean (Bank 2); DTC P0175: System Too Rich (Bank 2)
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • WIRING DIAGRAM
      • CONFIRMATION DRIVING PATTERN
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P0230: Fuel Pump Primary Circuit
      • DESCRIPTION
      • WIRING DIAGRAM
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P0300: Random / Multiple Cylinder Misfire Detected; DTC P0301: Cylinder 1 Misfire Detected; DTC P0302: Cylinder 2 Misfire Detected; DTC P0303: Cylinder 3 Misfire Detected; DTC P0304: Cylinder 4 Misfire Detected; DTC P0305: Cylinder 5 Misfire Detected; DTC P0306: Cylinder 6 Misfire Detected
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • MONITOR RESULT
      • WIRING DIAGRAM
      • CONFIRMATION DRIVING PATTERN
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P0327: Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor); DTC P0328: Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor); DTC P0332: Knock Sensor 2 Circuit Low Input (Bank 2); DTC P0333: Knock Sensor 2 Circuit High Input (Bank 2)
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • WIRING DIAGRAM
      • CONFIRMATION DRIVING PATTERN
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P0335: Crankshaft Position Sensor "A" Circuit; DTC P0339: Crankshaft Position Sensor "A" Circuit Intermittent
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • COMPONENT OPERATING RANGE
      • WIRING DIAGRAM
      • CONFIRMATION DRIVING PATTERN
      • INSPECTION PROCEDURE
      • PROCEDURE
    • DTC P0340: Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor); DTC P0342: Camshaft Position Sensor "A" Circuit Low Input (Bank 1 or Single Sensor); DTC P0343: Camshaft Position Sensor "A" Circuit High Input (Bank 1 or Single Sensor); DTC P0345: Camshaft Position Sensor "A" Circuit (Bank 2); DTC P0347: Camshaft Position Sensor "A" Circuit Low Input (Bank 2); DTC P0348: Camshaft Position Sensor "A" Circuit High Input (Bank 2)
      • DESCRIPTION
      • MONITOR DESCRIPTION
      • MONITOR STRATEGY
      • TYPICAL ENABLING CONDITIONS
      • TYPICAL MALFUNCTION THRESHOLDS
      • COMPONENT OPERATING RANGE
      • WIRING DIAGRAM
      • CONFIRMATION DRIVING PATTERN
      • INSPECTION PROCEDURE
      • PROCEDURE
• FIGURES
  • Fig. 1: Camshaft Position Sensor Communication Diagram
  • Fig. 2: Identifying Camshaft Timing Oil Control Valve For Intake Camshaft Wiring Diagram
  • Fig. 3: Measuring Resistance Between Terminals Of OCV
  • Fig. 4: Identifying Confirmation Driving Pattern
  • Fig. 5: Identifying Camshaft Pulley & Camshaft Bearing Cap Timing Marks
  • Fig. 6: Measuring Resistance Between Terminals Of OCV
  • Fig. 7: Applying Positive Battery Voltage To Terminal 1 And The Negative Battery Voltage To Terminal 2
  • Fig. 8: Locating Oil Pipe No. 1 Assembly & Bolts
  • Fig. 9: Camshaft Position Sensor Communication Diagram
  • Fig. 10: Identifying Camshaft Timing Oil Control Valve For Exhaust Camshaft Wiring Diagram
  • Fig. 11: Measuring Resistance Between Terminals Of OCV
  • Fig. 12: Identifying Confirmation Driving Pattern
  • Fig. 13: Identifying Valve Timing Marks
  • Fig. 14: Measuring Resistance Between Terminals Of OCV
  • Fig. 15: Applying Positive Battery Voltage To Terminal 1 And The Negative Battery Voltage To Terminal 2
  • Fig. 16: Locating Oil Pipe No. 1 Assembly & Bolts
  • Fig. 17: Identifying Confirmation Driving Pattern
  • Fig. 18: Identifying Valve Timing Marks
  • Fig. 19: Measuring Resistance Between Terminals Of OCV
  • Fig. 20: Applying Positive Battery Voltage To Terminal 1 And The Negative Battery Voltage To Terminal 2
  • Fig. 21: Locating Oil Pipe No. 1 Assembly & Bolts
  • Fig. 22: Identifying Confirmation Driving Pattern
  • Fig. 23: Identifying Valve Timing Marks
  • Fig. 24: Measuring Resistance Between Terminals Of OCV
  • Fig. 25: Applying Positive Battery Voltage To Terminal 1 And The Negative Battery Voltage To Terminal 2
  • Fig. 26: Locating Oil Pipe No. 1 Assembly & Bolts
  • Fig. 27: Identifying Oxygen (A/F) Sensor Heater Control Circuit Diagram
  • Fig. 28: Identifying Confirmation Driving Pattern
  • Fig. 29: Identifying Air Fuel Ratio Sensor Connector
  • Fig. 30: Identifying Air Fuel Ratio Sensor Connector
  • Fig. 31: Identifying Reference System Diagram Of Bank 1 Sensor 2
  • Fig. 32: Identifying Confirmation Driving Pattern
  • Fig. 33: Identifying Heated Oxygen Sensor Connector
  • Fig. 34: Identifying Heated Oxygen Sensor Connector
  • Fig. 35: Confirmation Driving Pattern
  • Fig. 36: Identifying Temperature Sensor Circuit
  • Fig. 37: Identifying ECM Wiring Diagram
  • Fig. 38: Identifying Confirmation Driving Pattern
  • Fig. 39: Identifying Mass Air Flow Meter Connector
  • Fig. 40: Identifying Mass Air Flow Meter Connector
  • Fig. 41: Intake Air Temperature Sensor Graph
  • Fig. 42: Identifying Confirmation Driving Pattern
  • Fig. 43: IAT Sensor Graph
  • Fig. 44: Identifying IAT Sensor Wiring Diagram
  • Fig. 45: Identifying Mass Air Flow Meter Connector
  • Fig. 46: Identifying Mass Air Flow Meter Connector
  • Fig. 47: Identifying Engine Coolant Temperature Sensor Wiring Diagram
  • Fig. 48: Identifying Engine Coolant Temperature Sensor Connector
  • Fig. 49: Identifying Engine Coolant Temperature Sensor Connector
  • Fig. 50: Identifying Confirmation Driving Pattern
  • Fig. 51: Identifying IAT Sensor Graph
  • Fig. 52: Identifying Confirmation Driving Pattern
  • Fig. 53: Identifying Throttle Position Sensor & Graph
  • Fig. 54: Identifying Throttle Control Motor/Throttle Position Sensor Wiring Diagram
  • Fig. 55: Identifying Confirmation Driving Pattern
  • Fig. 56: Identifying Engine Coolant Temperature Graph
  • Fig. 57: Identifying Confirmation Driving Pattern
  • Fig. 58: Heated Oxygen Sensor Output Voltage Graph
  • Fig. 59: Heated Oxygen Sensor Circuit Voltage Variation Graph
  • Fig. 60: Identifying Heated Oxygen Circuit Low Voltage Graph
  • Fig. 61: Identifying DTC Detection Area
  • Fig. 62: Identifying Relationship Between Element Temperature And Impedance Graph
  • Fig. 63: Identifying Confirmation Driving Pattern
  • Fig. 64: Identifying Confirmation Driving Pattern
  • Fig. 65: Identifying Heated Oxygen Sensor Connector
  • Fig. 66: A/F Sensor Voltage Graph
  • Fig. 67: Identifying Air-Fuel Ratio (A/F) Sensor Output
  • Fig. 68: Identifying Confirmation Driving Pattern
  • Fig. 69: Fuel System Malfunction Threshold Condition Graph
  • Fig. 70: Identifying Confirmation Driving Pattern
  • Fig. 71: Identifying Air Fuel Ratio Sensor Connector
  • Fig. 72: Identifying Air Fuel Ratio Sensor Connector
  • Fig. 73: Identifying Vehicle Speed Driving Pattern
  • Fig. 74: Identifying Crankshaft Position Sensor Wiring Diagram (1 Of 2)
  • Fig. 75: Identifying Crankshaft Position Sensor Wiring Diagram (2 Of 2)
  • Fig. 76: Identifying Fuel Pump Relay Terminals
  • Fig. 77: Identifying ECM Communication Diagram
  • Fig. 78: Identifying Ignition System Wiring Diagram (1 Of 2)
  • Fig. 79: Identifying Ignition System Wiring Diagram (2 Of 2)
  • Fig. 80: Identifying Spark Plug
  • Fig. 81: Identifying Injector Connector
  • Fig. 82: Identifying Spark Plug
  • Fig. 83: Identifying Injector Connector
  • Fig. 84: Knock Sensor Signal Waveform Graph
  • Fig. 85: Identifying Knock Sensor Wiring Diagram
  • Fig. 86: Identifying BD1 Connector
  • Fig. 87: Identifying ECM
  • Fig. 88: Identifying BD1 Connector
  • Fig. 89: Identifying VV1, VV2 & NE Signal Waveform
  • Fig. 90: Identifying Sensor For Intake Camshaft Wiring Diagram
  • Fig. 91: Identifying Crankshaft Position Sensor Connector
  • Fig. 92: Checking CKP Sensor Installation
  • Fig. 93: Identifying VV1, VV2 & NE Signal Waveforms
  • Fig. 94: Identifying VVT Sensor Connector
  • Fig. 95: Checking CKP Sensor Installation
• TABLES
  • P0011, P0021:
  • P0012, P0022:
  • TEXT IN ILLUSTRATION
  • TEXT IN ILLUSTRATION
  • TEXT IN ILLUSTRATION
  • ADVANCED CAMSHAFT TIMING:
  • RETARDED CAMSHAFT TIMING:
  • TEXT IN ILLUSTRATION
  • TEXT IN ILLUSTRATION
  • TEXT IN ILLUSTRATION
  • ALL:
  • TEXT IN ILLUSTRATION
  • TEXT IN ILLUSTRATION
  • TEXT IN ILLUSTRATION
  • ALL:
  • TEXT IN ILLUSTRATION
  • TEXT IN ILLUSTRATION
  • TEXT IN ILLUSTRATION
  • ALL:
  • P0031 AND P0051:
  • P0032 AND P0052:
  • P101D AND P103D:
  • P0031 AND P0051:
  • P0032 AND P0052:
  • P0031 AND P0051:
  • P0032 AND P0052:
  • P101D AND P103D:
  • TEXT IN ILLUSTRATION
  • TEXT IN ILLUSTRATION
  • ALL:
  • P0037 AND P0057:
  • P0038 AND P0058 (CASE 1):
  • P0038 AND P0058 (CASE 2):
  • P0141 AND P0161:
  • P102D AND P105D:
  • P0037 AND P0057:
  • P0038 AND P0058:
  • P0141 AND P0161 (HEATER PERFORMANCE MONITOR CHECK):
  • P102D AND P105D:
  • TEXT IN ILLUSTRATION
  • TEXT IN ILLUSTRATION
  • P0102:
  • P0103:
  • TEXT IN ILLUSTRATION
  • TEXT IN ILLUSTRATION
  • ALL:
  • AFTER ENGINE STOP:
  • AFTER COLD ENGINE START:
  • AFTER ENGINE STOP:
  • AFTER COLD ENGINE START:
  • P0112:
  • P0113:
  • TEXT IN ILLUSTRATION
  • TEXT IN ILLUSTRATION
  • P0115:
  • P0117:
  • P0118:
  • TEXT IN ILLUSTRATION
  • TEXT IN ILLUSTRATION
  • ALL:
  • ENGINE COOLANT TEMPERATURE SENSOR COLD START MONITOR:
  • ENGINE COOLANT TEMPERATURE SENSOR SOAK MONITOR:
  • ENGINE COOLANT TEMPERATURE SENSOR COLD START MONITOR:
  • ENGINE COOLANT TEMPERATURE SENSOR SOAK MONITOR:
  • REFERENCE (NORMAL CONDITION)
  • P0120, P0122, P0123, P0220, P0222, P0223, P2135
  • P0121
  • P0120:
  • P0121:
  • P0122:
  • P0123:
  • P0220:
  • P0222:
  • P0223:
  • P2135:
  • FOR MEXICO MODELS
  • HEATED OXYGEN SENSOR OUTPUT VOLTAGE (OUTPUT VOLTAGE, LOW OUTPUT VOLTAGE):
  • HEATED OXYGEN SENSOR IMPEDANCE (LOW):
  • HEATED OXYGEN SENSOR IMPEDANCE (HIGH):
  • HEATED OXYGEN SENSOR OUTPUT VOLTAGE (EXTREMELY HIGH):
  • HEATED OXYGEN SENSOR VOLTAGE DURING FUEL CUT:
  • HEATED OXYGEN SENSOR OUTPUT VOLTAGE (OUTPUT VOLTAGE):
  • HEATED OXYGEN SENSOR OUTPUT VOLTAGE (LOW OUTPUT VOLTAGE):
  • HEATED OXYGEN SENSOR IMPEDANCE (LOW):
  • HEATED OXYGEN SENSOR IMPEDANCE (HIGH):
  • HEATED OXYGEN SENSOR OUTPUT VOLTAGE (EXTREMELY HIGH):
  • HEATED OXYGEN SENSOR VOLTAGE DURING FUEL-CUT:
  • TEXT IN ILLUSTRATION
  • AIR FUEL RATIO SENSOR (BANK 1, 2) SLOW RESPONSE (RICH TO LEAN)
  • AIR FUEL RATIO SENSOR (BANK 1, 2) SLOW RESPONSE (LEAN TO RICH)
  • AIR FUEL RATIO SENSOR (BANK 1, 2) DELAYED RESPONSE (RICH TO LEAN)
  • AIR FUEL RATIO SENSOR (BANK 1, 2) DELAYED RESPONSE (LEAN TO RICH)
  • RESULT
  • RESULT
  • RESULT
  • FUEL-TRIM:
  • FUEL-TRIM:
  • RESULT
  • TEXT IN ILLUSTRATION
  • TEXT IN ILLUSTRATION
  • MISFIRE:
  • MONITOR PERIOD OF EMISSION-RELATED-MISFIRE:
  • MONITOR PERIOD OF CATALYST-DAMAGED-MISFIRE (MIL BLINKS):
  • MISFIRE: FOR MEXICO MODELS
  • MONITOR PERIOD OF EMISSION-RELATED-MISFIRE: FOR MEXICO MODELS
  • MONITOR PERIOD OF CATALYST-DAMAGED-MISFIRE (MIL BLINKS): FOR MEXICO MODELS
  • MONITOR PERIOD OF EMISSION-RELATED-MISFIRE:
  • MONITOR PERIOD OF CATALYST-DAMAGED-MISFIRE (MIL BLINKS):
  • MONITOR PERIOD OF EMISSION-RELATED-MISFIRE: FOR MEXICO MODELS
  • MONITOR PERIOD OF CATALYST-DAMAGED-MISFIRE (MIL BLINKS): FOR MEXICO MODELS
  • RECOMMENDED SPARK PLUG:
  • TEXT IN ILLUSTRATION
  • RECOMMENDED SPARK PLUG:
  • TEXT IN ILLUSTRATION
  • RESULT
  • RESULT
  • KNOCK SENSOR RANGE CHECK (LOW VOLTAGE) P0327 AND P0332:
  • KNOCK SENSOR RANGE CHECK (HIGH VOLTAGE) P0328 AND P0333:
  • TEXT IN ILLUSTRATION
  • TEXT IN ILLUSTRATION
  • TEXT IN ILLUSTRATION
  • ALL:
  • P0335: CRANKSHAFT POSITION SENSOR RANGE CHECK/RATIONALITY
  • P0335: CRANKSHAFT POSITION SENSOR VERIFY PULSE INPUT (CASE 1)
  • P0335: CRANKSHAFT POSITION SENSOR VERIFY PULSE INPUT (CASE 2)
  • CRANKSHAFT POSITION SENSOR RANGE CHECK/RATIONALITY
  • CRANKSHAFT POSITION SENSOR VERIFY PULSE INPUT
  • TEXT IN ILLUSTRATION
  • ALL:
  • P0340: VVT SENSOR (BANK 1) VERIFY PULSE INPUT (CASE 1)
  • P0340: VVT SENSOR (BANK 1) VERIFY PULSE INPUT (CASE 2)
  • P0342, P0343: VVT SENSOR (BANK 1) RANGE CHECK
  • P0345: VVT SENSOR (BANK 2) VERIFY PULSE INPUT
  • P0347, P0348: VVT SENSOR (BANK 1) RANGE CHECK
  • P0340: VVT SENSOR (BANK 1) VERIFY PULSE INPUT (CASE 1)
  • P0340: VVT SENSOR (BANK 1) VERIFY PULSE INPUT (CASE 2)
  • P0342, P0347: VVT SENSOR (BANK1, 2) RANGE CHECK (LOW VOLTAGE)
  • P0343, P0348: VVT SENSOR (BANK1, 2) RANGE CHECK (HIGH VOLTAGE)
  • P0345: VVT SENSOR (BANK 2) VERIFY PULSE INPUT
  • TEXT IN ILLUSTRATION

2011 ENGINE PERFORMANCE

Engine Control System (2GR-FE) (Diagnostic Codes (P0010-P0340) & Circuit Tests) Highlander

SFI SYSTEM

DTC P0010: Camshaft Position "A" Actuator Circuit (Bank 1); DTC P0020: Camshaft Position "A" Actuator Circuit (Bank 2)

DESCRIPTION

The Variable Valve Timing (VVT) system includes the ECM, camshaft oil control valve and VVT controller. The ECM sends a target duty-cycle control signal to the camshaft oil control valve. This control signal regulates the oil pressure supplied to the VVT controller. Camshaft timing control is performed according to engine operating conditions such as intake air volume, throttle valve position and engine coolant temperature. The ECM controls the camshaft oil control valve, based on the signals transmitted by several sensors. The VVT controller regulates the intake camshaft angle using oil pressure through the camshaft oil control valve. As a result, the relative positions of the camshaft and crankshaft are optimized, the engine torque and fuel economy improves, and the exhaust emissions decrease under overall driving conditions. The ECM detects the actual intake valve timing using signals from the camshaft and crankshaft position sensors, and performs feedback control. This is how the target intake valve timing is verified by the ECM.

Fig. 1: Camshaft Position Sensor Communication Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DTC No.	DTC Detection Condition	Trouble Area
P0010	Open or short in camshaft oil control valve for intake camshaft (bank 1) circuit timing (1 trip detection logic)	Open or short in camshaft timing oil control valve for intake camshaft (bank 1) circuit Camshaft timing oil control valve for intake camshaft (bank 1) ECM
P0020	Open or short in camshaft timing oil control valve for intake camshaft (bank 2) circuit (1 trip detection logic)	Open or short in camshaft timing oil control valve for intake camshaft (bank 2) circuit Camshaft timing oil control valve for intake camshaft (bank 2) ECM

MONITOR DESCRIPTION

After the ECM sends the "target" duty-cycle signal to the camshaft timing oil control valve, the ECM monitors the camshaft oil control valve current to establish an "actual" duty-cycle. The ECM detects a malfunction and sets a DTC when the actual duty-cycle ratio varies from the target duty-cycle ratio.

MONITOR STRATEGY

Related DTCs	P0010: VVT OCV (bank 1) range check P0020: VVT OCV (bank 2) range check
Required sensors / components (Main)	VVT OCV (VVT camshaft oil control valve)
Required sensors / components (Sub)	-
Frequency of operation	Continuous
Duration	1 second
MIL operation	Immediately
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever these DTCs are not present	None
All of the following conditions are met:	-
Starter	OFF
Ignition switch	ON (IG)
Time after turning ignition switch off to on (IG)	0.5 seconds or more

TYPICAL MALFUNCTION THRESHOLDS

One of the following conditions is met:	Condition A, B or C
A. All of the following conditions are met:	-
Battery voltage	11 to 13 V
Target duty ratio	Less than 70%
Output signal duty ratio	100% or more
B. All of the following conditions are met:	-
Battery voltage	13 V or more
Target duty ratio	Less than 80%
Output signal duty ratio	100% or more
C. All of the following conditions are met:	-
Current cut status	Not cut
Output signal duty ratio	3% or less

COMPONENT OPERATING RANGE

VVT OCV duty ratio

More than 3%, and Less than 100%

WIRING DIAGRAM

Fig. 2: Identifying Camshaft Timing Oil Control Valve For Intake Camshaft Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

CONFIRMATION DRIVING PATTERN

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch on (IG) and turn the Techstream on.
6. Wait 5 seconds.
7. Enter the following menus: Powertrain / Engine and ECT / Trouble Code.
8. Read the pending DTCs.

   HINT:

   • If a pending DTC is output, the system is malfunctioning.
   • If a pending DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
10. Input the DTC: P0010 or P0020.
11. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
12. If the judgment result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs, refer to DTC CHECK / CLEAR .

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

HINT:

• If DTC P0010 is displayed, check the intake camshaft circuit for the right bank VVT system.
• Bank 1 refers to the bank that includes the No. 1 cylinder*.

  *: The No. 1 cylinder is the cylinder which is farthest from the transmission.

• Bank 2 refers to the bank that does not include the No. 1 cylinder.
• If DTC P0020 is displayed, check the intake camshaft circuit for the left bank VVT system.
• Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE OIL CONTROL VALVE FOR INTAKE CAMSHAFT)
   1. Connect the Techstream to the DLC3.
   2. Start the engine and turn the tester on.
   3. Warm up the engine.
   4. Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the VVT Linear (Bank 1) or Control the VVT Linear (Bank 2).
   5. Check the engine speed while operating the oil control valve using the tester.

      OK

      Tester Operation	Specified Condition
      0%	Normal engine speed
      100%	Engine idles roughly or stalls (soon after OCV switched from OFF to ON)

   NG --> See step 2

   OK --> See step 5

2. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (FOR INTAKE CAMSHAFT)
   1. Disconnect the intake camshaft timing oil control valve connector.

      Fig. 3: Measuring Resistance Between Terminals Of OCV
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection	Condition	Specified Condition
      1 - 2	20°C (68°F)	6.9 to 7.9 ohms

   3. Reconnect the camshaft timing oil control valve connector.

   NG --> See step 6

   OK: Go to next step

3. CHECK HARNESS AND CONNECTOR (CAMSHAFT TIMING OIL CONTROL VALVE - ECM)
   1. Disconnect the intake camshaft timing camshaft oil control valve connector.
   2. Disconnect the ECM connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)

      Bank 1

      Bank 2

      Tester Connection	Condition	Specified Condition
      B50-19 (OC1+) - B24-1	Always	Below 1 ohms
      B50-20 (OC1-) - B24-2	Always	Below 1 ohms

      Tester Connection	Condition	Specified Condition
      B51-19 (OC2+) - B25-1	Always	Below 1 ohms
      B51-20 (OC2-) - B25-2	Always	Below 1 ohms

      Standard resistance (Check for short)

      Bank 1

      Bank 2

      Tester Connection	Condition	Specified Condition
      B50-19 (OC1+) or B24-1 - Body ground	Always	10 kohms or higher
      B50-20 (OC1-) or B24-2 - Body ground	Always	10 kohms or higher

      Tester Connection	Condition	Specified Condition
      B51-19 (OC2+) or B25-1 - Body ground	Always	10 kohms or higher
      B51-20 (OC2-) or B25-2 - Body ground	Always	10 kohms or higher

   4. Reconnect the camshaft timing oil control valve connector.
   5. Reconnect the ECM connector.

   NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (CAMSHAFT TIMING OIL CONTROL VALVE - ECM)

   OK --> See step 4

4. REPLACE ECM. Refer to COMPONENTS
5. CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS
6. REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY. Refer to REMOVAL

DTC P0011: Camshaft Position "A" - Timing Over-Advanced or System Performance (Bank 1); DTC P0012: Camshaft Position "A" - Timing Over-Retarded (Bank 1); DTC P0021: Camshaft Position "A" - Timing Over-Advanced or System Performance (Bank 2); DTC P0022: Camshaft Position "A" - Timing Over-Retarded (Bank 2)

CAUTION / NOTICE / HINT

HINT:

If DTC P0011, P0012, P0021 or P0022 is present, check the VVT (Variable Valve Timing) system.

DESCRIPTION

Refer to DTC P0010, refer to DESCRIPTION.

DTC No.	DTC Detection Condition	Trouble Area
P0011 P0021	Valve timing is not adjusted in valve timing advance range (1 trip detection logic)	Valve timing Camshaft timing oil control valve for intake camshaft Camshaft timing oil control valve filter Intake camshaft (bank 1, 2) timing gear assembly ECM
P0012 P0022	Valve timing is not adjusted in valve timing retard range (2 trip detection logic)	Valve timing Camshaft timing oil control valve for intake camshaft Camshaft timing oil control valve filter Intake camshaft (bank 1, 2) timing gear assembly ECM

MONITOR DESCRIPTION

The ECM optimizes the intake valve timing using the VVT (Variable Valve Timing) system to control the intake camshaft. The VVT system includes the ECM, the oil control valve and the VVT controller. The ECM sends a target duty-cycle control signal to the camshaft timing oil control valve. This control signal regulates the oil pressure applied to the VVT controller. The VVT controller can advance or retard the intake camshaft.

If the difference between the target and actual intake valve timings is large, and changes in actual intake valve timing are small, the ECM interprets this as the VVT controller stuck malfunction and sets a DTC.

Example:

• A DTC will be set when the following conditions 1 and 2 are met:
• 1) It takes 5 seconds or more to change the valve timing by 5° CA.
• 2) After above condition 1 is met, the camshaft timing oil control valve is forcibly activated for 10 seconds.

  DTCs P0011 and P0021 (Advanced Cam Timing) are detected with 1 trip detection logic.

  DTCs P0012 and P0022 (Retarded Cam Timing) are detected with 2 trip detection logic.

  These DTCs indicate that the VVT controller cannot operate properly due to camshaft timing oil control valve malfunctions or the presence of foreign objects in the camshaft timing oil control valve.

• The monitor will not run unless the following conditions are met:

  - The engine is warm (the engine coolant temperature is 75°C [167°F] or more).

  - The vehicle has been driven at more than 40 mph (64 km/h) for 3 minutes.

  - The engine has idled for 3 minutes.

MONITOR STRATEGY

Related DTCs	P0011: Advanced intake camshaft timing (bank 1) P0012: Retarded intake camshaft timing (bank 1) P0021: Advanced intake camshaft timing (bank 2) P0022: Retarded intake camshaft timing (bank 2)
Required sensors / components (Main)	VVT OCV, VVT Actuator
Required sensors / components (Related)	Crankshaft position sensor, Camshaft position sensor, ECT sensor
Frequency of operation	Continuous
Duration	Less than 10 seconds
MIL operation	P0011 and P0021: Immediate P0012 and P0022: 2 driving cycles
Sequence operation	None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever these DTCs are not present	P0010, P0020 (OCV bank 1, 2) P0016, P0018 (VVT system bank 1, 2 - misalignment) P0102, P0103 (MAF meter) P0115, P0117, P0118 (ECT sensor) P0125 (Insufficient ECT for closed loop) P0335 (CKP sensor)
Battery voltage	11 V or more
Engine RPM	500 to 4000 RPM
ECT	75 to 100°C (167 to 212°F)

TYPICAL MALFUNCTION THRESHOLDS

P0011, P0021:

Duration of actual valve timing and target valve timing	More than 5°CA (Crankshaft angle)
Valve timing	No change in advanced valve timing

P0012, P0022:

Duration of actual valve timing and target valve timing	More than 5°CA (Crankshaft angle)
Valve timing	No change in retarded valve timing

If the difference between the target and actual camshaft timings is greater than the specified value, the ECM operates the VVT actuator.

Then, the ECM monitors the camshaft timing change for 5 seconds.

WIRING DIAGRAM

Refer to DTC P0010, refer to WIRING DIAGRAM.

CONFIRMATION DRIVING PATTERN

Fig. 4: Identifying Confirmation Driving Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch on (IG) and turn the Techstream on [A].
6. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [B].
7. Drive the vehicle at approximately 60 km/h (37 mph) for 10 minutes or more [C].

   WARNING:

   When performing the confirmation driving pattern, obey all speed limits and traffic laws.

8. Idle the engine for 3 minutes or more [D].
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [E].
10. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P0011, P0012, P0021 or P0022.
13. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [F] through [H].
14. Repeat the pattern of accelerating the vehicle from rest to approximately 60 km/h (37 mph) and then decelerating the vehicle 10 to 15 times [F].

    WARNING:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

    HINT:

    Depress the accelerator pedal by a large amount.

15. Idle the engine for 3 minutes or more [G].
16. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [H].
17. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
18. Check the DTC judgment result again.

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or UNKNOWN, perform the following procedure.
19. Perform a universal trip and check for permanent DTCs, refer to DTC CHECK / CLEAR .

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

Abnormal bank	Advanced timing over (Valve timing is out of specified range)	Retarded timing over (Valve timing is out of specified range)
Bank 1	P0011	P0012
Bank 2	P0021	P0022

HINT:

• If DTC P0011 or P0012 is displayed, check the bank 1 VVT system circuit.
• Bank 1 refers to the bank that includes the No. 1 cylinder*.

  *: The No. 1 cylinder is the cylinder which is farthest from the transmission.

• Bank 2 refers to the bank that does not include the No. 1 cylinder.
• If DTC P0021 or P0022 is displayed, check the bank 2 VVT system circuit.
• Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0011, P0012, P0021 OR P0022)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG) and turn the tester on.
   3. Select the following menu items: Powertrain / Engine and ECT / Trouble Code.
   4. Read the DTCs.

      Result

      Display (DTC Output)	Proceed to
      P0011, P0012, P0021 or P0022	A
      P0011, P0012, P0021 or P0022 and other DTCs	B

      HINT:

      If any DTCs other than P0011, P0012, P0021 or P0022 are output, troubleshoot those DTCs first.

   B --> See step 9

   A: Go to next step

2. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE OIL CONTROL VALVE FOR INTAKE CAMSHAFT)
   1. Connect the Techstream to the DLC3.
   2. Start the engine and turn the tester on.
   3. Warm up the engine.
   4. Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the VVT Linear (Bank 1) or Control the VVT Linear (Bank 2).
   5. Check the engine speed while operating the oil control valve using the tester.

      OK

      Tester Operation	Specified Condition
      0%	Normal engine idle speed
      100%	Engine idles roughly or stalls (soon after OCV switched from OFF to ON)

   NG --> See step 4

   OK: Go to next step

3. CHECK WHETHER DTC OUTPUT RECURS (DTC P0011, P0012, P0021 OR P0022)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG) and turn the tester on.
   3. Clear the DTCs, refer to DTC CHECK / CLEAR .
   4. Start the engine and warm it up.
   5. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
   6. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
   7. Read the DTCs using the tester.

      OK

      No pending DTC output.

   NG --> See step 4

   OK --> SYSTEM IS OK

4. CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN)
   1. Remove the cylinder head covers RH and LH.

      Fig. 5: Identifying Camshaft Pulley & Camshaft Bearing Cap Timing Marks
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Turn the crankshaft to align the timing marks of the crankshaft.
   3. Align the notch of the crankshaft pulley to the "0" position.
   4. Check if the timing marks of the camshaft pulley and camshaft bearing cap align.
   5. Turn the crankshaft clockwise by 360° if the timing marks do not align. Check if they align once again.

      OK

      The timing marks of the camshaft pulley and the camshaft bearing cap align when the notch of the crankshaft pulley is in the "0" position.

      TEXT IN ILLUSTRATION
      

      *1	Timing Mark

   NG --> See step 10

   OK: Go to next step

5. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (FOR INTAKE CAMSHAFT)
   1. Remove the intake camshaft timing oil control valve.
   2. Measure the resistance according to the value(s) in the table below.

      Fig. 6: Measuring Resistance Between Terminals Of OCV
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Standard resistance

      Tester Connection	Condition	Specified Condition
      1 - 2	20°C (68°F)	6.9 to 7.9 ohms

   3. Apply the positive battery voltage to terminal 1 and the negative battery voltage to terminal 2. Check the valve operation.

      Fig. 7: Applying Positive Battery Voltage To Terminal 1 And The Negative Battery Voltage To Terminal 2
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      OK

      Valve moves quickly.

      TEXT IN ILLUSTRATION
      

      *1	Valve Moves

   4. Reinstall the camshaft timing oil control valve.

   NG --> See step 11

   OK: Go to next step

6. CHECK OIL PIPE AND OIL CONTROL VALVE FILTER
   1. Remove the oil pipe No. 1 or oil pipe assembly.

      Fig. 8: Locating Oil Pipe No. 1 Assembly & Bolts
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Remove the oil control valve filter.
   3. Check that the filter and pipe are not clogged.

      OK

      The filter and pipe are not clogged.

      TEXT IN ILLUSTRATION
      

      *1	RH Bank
      *2	LH Bank

   NG --> REPLACE OIL CONTROL VALVE FILTER OR PIPE

   OK: Go to next step

7. REPLACE CAMSHAFT TIMING GEAR ASSEMBLY

   NEXT: Go to next step

8. CHECK WHETHER DTC OUTPUT RECURS
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG) and turn the tester on.
   3. Clear the DTCs, refer to DTC CHECK / CLEAR .
   4. Start the engine and warm it up.
   5. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
   6. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
   7. Read the pending DTCs.

      OK

      No pending DTC output.

      HINT:

      DTC P0011, P0012, P0021 or P0022 is output when foreign objects in engine oil are caught in some parts of the system. These codes will stay output even if the system returns to normal after a short time. These foreign objects are then captured by the oil filter, thus eliminating the source of the problem.

   NG --> See step 12

   OK --> SYSTEM IS OK

9. GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART
10. ADJUST VALVE TIMING. Refer to REASSEMBLY
11. REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY. Refer to REMOVAL
12. REPLACE ECM. Refer to COMPONENTS

DTC P0013: Camshaft Position "B" Actuator Circuit / Open (Bank 1); DTC P0023: Camshaft Position "B" Actuator Circuit / Open (Bank 2)

DESCRIPTION

The Variable Valve Timing (VVT) system includes the ECM, camshaft timing oil control valve and VVT controller. The ECM sends a target duty-cycle control signal to the camshaft timing oil control valve. This control signal regulates the oil pressure supplied to the VVT controller. Camshaft timing control is performed according to engine operating conditions such as the intake air volume, throttle valve position and engine coolant temperature. The ECM controls the camshaft timing oil control valve, based on the signals transmitted by several sensors. The VVT controller regulates the exhaust camshaft angle using oil pressure through the camshaft timing oil control valve. As a result, the relative positions of the camshaft and crankshaft are optimized, the engine torque and fuel economy improve, and the exhaust emissions decrease under overall driving conditions. The ECM detects the actual exhaust valve timing using signals from the camshaft and crankshaft position sensors, and performs feedback control. This is how the target intake valve timing is verified by the ECM.

Fig. 9: Camshaft Position Sensor Communication Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DTC No.	DTC Detection Condition	Trouble Area
P0013	Open or short in camshaft timing oil control valve for exhaust camshaft (bank 1) circuit (1 trip detection logic)	Open or short in camshaft timing oil control valve for exhaust camshaft (bank 1) circuit Camshaft timing oil control valve for exhaust camshaft (bank 1) ECM
P0023	Open or short in camshaft timing oil control valve for exhaust camshaft (bank 2) circuit (1 trip detection logic)	Open or short in camshaft timing oil control valve for exhaust camshaft (bank 2) circuit Camshaft timing oil control valve for exhaust camshaft (bank 2) ECM

MONITOR DESCRIPTION

The ECM optimizes the valve timing using the VVT system to control the exhaust camshaft. The VVT system includes the ECM, the camshaft timing oil control valve and the VVT controller. The ECM sends a target duty-cycle control signal to the camshaft timing oil control valve. This control signal regulates the oil pressure supplied to the VVT controller. The VVT controller can advance or retard the exhaust camshaft.

After the ECM sends the target duty-cycle signal to the camshaft timing oil control valve, the ECM monitors the camshaft timing oil control valve current to establish an actual duty-cycle. The ECM determines the existence of a malfunction and sets the DTC when the actual duty-cycle ratio varies from the target duty-cycle ratio.

MONITOR STRATEGY

Related DTCs	P0013: VVT OCV (bank 1) range check P0023: VVT OCV (bank 2) range check
Required sensors / components (Main)	VVT OCV (Variable Valve Timing oil control valve)
Required sensors / components (Sub)	-
Frequency of operation	Continuous
Duration	1 second
MIL operation	Immediate
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever these DTCs are not present	None
All of the following conditions are met	-
Starter	OFF
Ignition switch	ON
Time after ignition switch off to on	0.5 seconds or more

TYPICAL MALFUNCTION THRESHOLDS

Exhaust VVT oil control valve condition	No operation record
One of the following conditions is met:	Condition A, B or C
A. All of the following conditions are met	-
Battery voltage	11 to 13 V
Target duty ratio	Less than 70%
B. All of the following conditions are met:	-
Battery voltage	13 V or more
Target duty ratio	Less than 80%
C. All of the following conditions are met:	-
Current cut status	Not cut
Output signal duty ratio	Less than 3%

COMPONENT OPERATING RANGE

Output signal duty ratio

More than 3%, and less than 100%

WIRING DIAGRAM

Fig. 10: Identifying Camshaft Timing Oil Control Valve For Exhaust Camshaft Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

CONFIRMATION DRIVING PATTERN

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch on (IG) and turn the Techstream on.
6. Wait 5 seconds.
7. Enter the following menus: Powertrain / Engine and ECT / Trouble Code.
8. Read the pending DTCs.

   HINT:

   • If a pending DTC is output, the system is malfunctioning.
   • If a pending DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
10. Input the DTC: P0013 or P0023.
11. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
12. If the judgment result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs, refer to DTC CHECK / CLEAR .

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

HINT:

• If DTC P0013 is displayed, check the exhaust camshaft circuit for the bank 1 VVT system.
• Bank 1 refers to the bank that includes the No. 1 cylinder*.

  *: The No. 1 cylinder is the cylinder which is farthest from the transmission.

• Bank 2 refers to the bank that does not include the No. 1 cylinder.
• If DTC P0023 is displayed, check the exhaust camshaft circuit for the bank 2 VVT system.
• Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE OIL CONTROL VALVE FOR INTAKE CAMSHAFT)
   1. Connect the Techstream to the DLC3.
   2. Start the engine and turn the tester on.
   3. Warm up the engine.
   4. Select the following menus: Powertrain/ Engine and ECT / Active Test / Control the VVT Exhaust Linear (Bank 1) or Control the VVT Exhaust Linear (Bank 2).
   5. Check the engine speed while operating the oil control valve using the tester.

      OK

      Tester Operation	Specified Condition
      0% (OFF)	Normal engine speed
      127% (ON)	Engine idles roughly or stalls (soon after oil control valve switched from OFF to ON)

   NG --> See step 3

   OK --> See step 2

2. CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS
3. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY
   1. Disconnect the exhaust camshaft timing oil control valve connector.

      Fig. 11: Measuring Resistance Between Terminals Of OCV
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection	Condition	Specified Condition
      1 - 2	20°C (68°F)	6.9 to 7.9 ohms

   3. Reconnect the camshaft timing oil control valve connector.

   NG --> See step 4

   OK: Go to next step

4. REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY. Refer to REMOVAL
5. CHECK HARNESS AND CONNECTOR (CAMSHAFT TIMING OIL CONTROL VALVE - ECM)
   1. Disconnect the exhaust camshaft timing oil control valve connector.
   2. Disconnect the ECM connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)

      Bank 1

      Bank 2

      Tester Connection	Condition	Specified Condition
      B50-21 (OE1+) - B44-1	Always	Below 1 ohms
      B50-22 (OE1-) - B44-2	Always	Below 1 ohms

      Tester Connection	Condition	Specified Condition
      B51-21 (OE2+) - B41-1	Always	Below 1 ohms
      B51-22 (OE2-) - B41-2	Always	Below 1 ohms

      Standard resistance (Check for short)

      Bank 1

      Bank 2

      Tester Connection	Condition	Specified Condition
      B50-21 (OE1+) or B44-1 - Body ground	Always	10 kohms or higher
      B50-22 (OE1-) or B44-2 - Body ground	Always	10 kohms or higher

      Tester Connection	Condition	Specified Condition
      B51-21 (OE2+) or B41-1 - Body ground	Always	10 kohms or higher
      B51-22 (OE2-) or B41-2 - Body ground	Always	10 kohms or higher

   4. Reconnect the ECM connector.
   5. Reconnect the camshaft timing oil control valve connector.

   NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (CAMSHAFT TIMING OIL CONTROL VALVE - ECM)

   OK --> See step 6

6. REPLACE ECM. Refer to COMPONENTS

DTC P0014: Camshaft Position "B" - Timing Over-Advanced or System Performance (Bank 1); DTC P0015: Camshaft Position "B" - Timing Over-Retarded (Bank 1); DTC P0024: Camshaft Position "B" - Timing Over-Advanced or System Performance (Bank 2); DTC P0025: Camshaft Position "B" - Timing Over-Retarded (Bank 2)

CAUTION / NOTICE / HINT

HINT:

If DTC P0014, P0015, P0024 or P0025 is present, check the VVT (Variable Valve Timing) system.

DESCRIPTION

Refer to DTC P0013, refer to DESCRIPTION.

DTC No.	DTC Detection Condition	Trouble Area
P0014 P0024	Valve timing is not adjusted in valve timing advance range (2 trip detection logic)	Valve timing Camshaft timing oil control valve for exhaust camshaft Camshaft timing oil control valve filter Exhaust camshaft timing gear assembly ECM
P0015 P0025	Valve timing is not adjusted in valve timing retard range (1 trip detection logic)	Valve timing Camshaft timing oil control valve for exhaust camshaft Camshaft timing oil control valve filter Exhaust camshaft timing gear assembly ECM

MONITOR DESCRIPTION

DTC P0014 and P0024

The ECM compares current valve timing with target valve timing, while the engine is running and after being warmed up, in order to monitor the VVT system on the exhaust side. Valve timing is calculated from the positions of the camshaft and crankshaft. The ECM controls the engine so that current valve timing meets target valve timing. If these timings are not met, the ECM determines this as a malfunction.

DTC P0015 and P0025

The ECM compares current valve timing with target valve timing, while the engine is running and after being warmed up, in order to monitor the VVT system on the exhaust side. Valve timing is calculated from the positions of the camshaft and crankshaft. The ECM controls the engine so that current valve timing meets target valve timing. If these timings are not met, the ECM determines this as a malfunction.

Example:

• A DTC is stored when the following conditions 1 and 2 are met for 10 seconds or more.
• 1. It takes 5 seconds or more to change the value timing by 5°CA.
• 2. After the above condition 1 is met, the camshaft timing oil control value is forcibly activated during 10 seconds.

MONITOR STRATEGY

Related DTCs	P0014: Advanced exhaust camshaft timing (bank 1) P0015: Retarded exhaust camshaft timing (bank 1) P0024: Advanced exhaust camshaft timing (bank 2) P0025: Retarded exhaust camshaft timing (bank 2)
Required Sensors / Components (Main)	VVT camshaft timing oil control valve and VVT Actuator
Required Sensors / Components (Related)	P0014 and P0015: Exhaust camshaft control actuator bank 1 Exhaust camshaft timing oil control valve bank 1 P0024 and P0025: Exhaust camshaft control actuator bank 2 Exhaust camshaft timing oil control valve bank 2
Frequency of Operation	Continuously
Duration	Less than 10 seconds
MIL Operation	P0014 and P0024: 2 driving cycles P0015 and P0025: Immediate
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever these DTCs are not present	P0013, P0023 (Exhaust OCV bank 1, 2) P0017, P0019 (Exhaust VVT system bank 1, 2 - misalignment) P0102, P0103 (MAF meter) P0115, P0117, P0118 (ECT sensor) P0125 (Insufficient ECT for closed loop) P0335 (CKP sensor)
Battery voltage	11 V or more
Engine RPM	500 to 4000 RPM
Engine coolant temperature	75 to 100°C (167 to 212°F)

TYPICAL MALFUNCTION THRESHOLDS

ADVANCED CAMSHAFT TIMING:

Deviation of actual valve timing and target valve timing	More than 5 °CA (Crankshaft Angle)
Valve timing	No change in advanced valve timing

RETARDED CAMSHAFT TIMING:

Deviation of actual valve timing and target valve timing	More than 5 °CA (Crankshaft Angle)
Valve timing	No change in advanced valve timing

If the difference between the target and actual camshaft timings is greater than the specified value, the ECM operates the VVT actuator.

Then, the ECM monitors the camshaft timing change for 5 seconds.

WIRING DIAGRAM

Refer to DTC P0013, refer to WIRING DIAGRAM.

CONFIRMATION DRIVING PATTERN

Fig. 12: Identifying Confirmation Driving Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch on (IG) and turn the Techstream on [A].
6. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [B].
7. Drive the vehicle at approximately 60 km/h (37 mph) for 10 minutes or more [C].

   WARNING:

   When performing the confirmation driving pattern, obey all speed limits and traffic laws.

8. Idle the engine for 3 minutes or more [D].
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [E].
10. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P0014, P0015, P0024 or P0025.
13. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [F] through [H].
14. Repeat the pattern of accelerating the vehicle from rest to approximately 60 km/h (37 mph) and then decelerating the vehicle 10 to 15 times [F].

    WARNING:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

    HINT:

    Depress the accelerator pedal by a large amount.

15. Idle the engine for 3 minutes or more [G].
16. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [H].
17. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
18. Check the DTC judgment result again.

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or UNKNOWN, perform the following procedure.
19. Perform a universal trip and check for permanent DTCs, refer to DTC CHECK / CLEAR .

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

Abnormal bank	Advanced timing over (Valve timing is out of specified range)	Retarded timing over (Valve timing is out of specified range)
Bank 1	P0014	P0015
Bank 2	P0024	P0025

HINT:

• If DTC P0014 or P0015 is displayed, check the bank 1 VVT system circuit.
• Bank 1 refers to the bank that includes the No. 1 cylinder*.

  *: The No. 1 cylinder is the cylinder which is farthest from the transmission.

• Bank 2 refers to the bank that does not include the No. 1 cylinder.
• If DTC P0024 or P0025 is displayed, check the bank 2 VVT system circuit.
• Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0014, P0015, P0024 OR P0025)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG) and turn the tester on.
   3. Select the following menu items: Powertrain / Engine and ECT / Trouble Code.
   4. Read the DTCs.

      Result

      Display (DTC Output)	Proceed to
      P0014, P0015, P0024 or P0025	A
      P0014, P0015, P0024 or P0025 and other DTCs	B

      HINT:

      If any DTCs other than P0014, P0015, P0024 or P0025 are output, troubleshoot those DTCs first.

   B --> See step 9

   A: Go to next step

2. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE OIL CONTROL VALVE FOR EXHAUST CAMSHAFT)
   1. Connect the Techstream to the DLC3.
   2. Start the engine and turn the tester on.
   3. Warm up the engine.
   4. Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the VVT Exhaust Linear (Bank 1) or Control the VVT Exhaust Linear (Bank 2).
   5. Check the engine speed while operating the oil control valve using the tester.

      OK

      Tester Operation	Specified Condition
      0% (OFF)	Normal engine idle speed
      127% (ON)	Engine idles roughly or stalls (soon after OCV switched from OFF to ON)

   NG --> See step 4

   OK: Go to next step

3. CHECK WHETHER DTC OUTPUT RECURS (DTC P0014, P0015, P0024 OR P0025)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG) and turn the tester on.
   3. Clear the DTCs, refer to DTC CHECK / CLEAR .
   4. Start the engine and warm it up.
   5. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
   6. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
   7. Read the DTCs using the tester.

      OK

      No pending DTC output.

   NG --> See step 4

   OK --> SYSTEM IS OK

4. CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMP TEETH ON TIMING CHAIN)
   1. Remove the cylinder head covers RH and LH.

      Fig. 13: Identifying Valve Timing Marks
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Turn the crankshaft to align the matchmarks of the crankshaft.
   3. Align the notch of the crankshaft pulley to the "0" position.
   4. Check if the matchmarks of the camshaft pulley and camshaft bearing cap align.

      TEXT IN ILLUSTRATION
      

      *1	Timing Mark

   5. Turn the crankshaft clockwise by 360° if the matchmarks do not align. Check if they align once again.

      OK

      The matchmarks of the camshaft pulley and the camshaft bearing cap align when the notch of the crankshaft pulley is in the "0" position.

   NG --> See step 10

   OK: Go to next step

5. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (FOR EXHAUST CAMSHAFT)
   1. Remove the exhaust camshaft timing oil control valve.
   2. Measure the resistance according to the value(s) in the table below.

      Fig. 14: Measuring Resistance Between Terminals Of OCV
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Standard resistance

      Tester Connection	Condition	Specified Condition
      1 - 2	20°C (68°F)	6.9 to 7.9 ohms

   3. Apply the positive battery voltage to terminal 1 and the negative battery voltage to terminal 2. Check the valve operation.

      Fig. 15: Applying Positive Battery Voltage To Terminal 1 And The Negative Battery Voltage To Terminal 2
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      OK

      Valve moves quickly.

      TEXT IN ILLUSTRATION
      

      *1	Valve Moves

   4. Reinstall the camshaft timing oil control valve.

   NG --> See step 11

   OK: Go to next step

6. CHECK OIL PIPE AND OIL CONTROL VALVE FILTER
   1. Remove the oil pipe No. 1 or oil pipe assembly.

      Fig. 16: Locating Oil Pipe No. 1 Assembly & Bolts
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Remove the oil control valve filter.
   3. Check that the filter and pipe are not clogged.

      TEXT IN ILLUSTRATION
      

      *1	RH Bank
      *2	LH Bank

      OK

      The filter and pipe are not clogged.

   NG --> REPLACE OIL CONTROL VALVE FILTER OR PIPE

   OK: Go to next step

7. REPLACE CAMSHAFT TIMING GEAR ASSEMBLY

   NEXT: Go to next step

8. CHECK WHETHER DTC OUTPUT RECURS
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG) and turn the tester on.
   3. Clear the DTCs, refer to DTC CHECK / CLEAR .
   4. Start the engine and warm it up.
   5. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
   6. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
   7. Confirm that no DTC is set using the tester.

      OK

      No pending DTC output.

      HINT:

      DTC P0014, P0015, P0024 or P0025 is output when foreign objects in engine oil are caught in some parts of the system. These codes will stay registered even if the system returns to normal after a short time. These foreign objects are then captured by the oil filter, thus eliminating the source of the problem.

   NG --> See step 12

   OK --> SYSTEM IS OK

9. GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART
10. ADJUST VALVE TIMING. Refer to REASSEMBLY
11. REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY. Refer to REMOVAL
12. REPLACE ECM. Refer to COMPONENTS

DTC P0016: Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A); DTC P0018: Crankshaft Position - Camshaft Position Correlation (Bank 2 Sensor A)

DESCRIPTION

Refer to DTC P0335, refer to DESCRIPTION.

DTC No.	DTC Detection Condition	Trouble Area
P0016	Deviations in crankshaft position sensor and VVT sensor 1 (for intake camshaft) 1 signals (2 trip detection logic)	Valve timing Camshaft timing oil control valve for intake camshaft Camshaft timing oil control valve filter Intake camshaft timing gear assembly ECM
P0018	Deviations in crankshaft position sensor and VVT sensor 2 (for intake camshaft) 1 signals (2 trip detection logic)

MONITOR DESCRIPTION

The ECM optimizes the valve timing by using the VVT (Variable Valve Timing) system to control the intake camshaft. The VVT system includes the ECM, the camshaft timing oil control valve and the VVT controller.

The ECM sends a target duty-cycle control signal to the camshaft timing oil control valve. This control signal regulates the oil pressure applied to the VVT controller. The VVT controller can advance or retard the intake camshaft. The ECM calibrates the intake valve timing by setting the intake camshaft to the most retarded angle while the engine is idling. The ECM closes the camshaft timing oil control valve to retard the cam. The ECM stores this value as the VVT learning value. When the difference between the target and actual intake valve timings is 5° CA (Crankshaft Angle) or less, the ECM stores it.

If the VVT learning value matches the following conditions, the ECM determines the existence of a malfunction in the VVT system, and sets the DTC.

• The VVT learning value: Less than 18.5° CA, or more than 43.5° CA.
• The above condition continues for 18 seconds or more.

This DTC indicates that the intake camshaft has been installed toward the crankshaft at an incorrect angle, caused by factors such as the timing chain having jumped a tooth.

This monitor begins to run after the engine has idled for 5 minutes.

MONITOR STRATEGY

Related DTCs	P0016: Crankshaft position - Camshaft position misaligned at idling (bank 1) P0018: Crankshaft position - Camshaft position misaligned at idling (bank 2)
Required Sensors / Components (Main)	VVT actuator
Required Sensors / Components (Related)	Camshaft position sensor, Crankshaft position sensor
Frequency of Operation	Once per driving cycle
Duration	Less than 60 seconds
MIL Operation	2 driving cycles
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

ALL:

The monitor will run whenever these DTCs are not present	P0010, P0020 (OCV bank 1, 2) P0102, P0103 (MAF meter) P0115, P0117, P0118 (ECT sensor) P0125 (Insufficient ECT for closed loop) P0335 (CKP sensor)
Engine RPM	500 to 1000 RPM

TYPICAL MALFUNCTION THRESHOLDS

One of the following conditions is met:	Condition 1 or 2
1. VVT learning value at maximum retarded valve timing	Less than 18.5° CA
2. VVT learning value at maximum retarded valve timing	More than 43.5° CA

WIRING DIAGRAM

Refer to DTC P0335, refer to WIRING DIAGRAM.

CONFIRMATION DRIVING PATTERN

Fig. 17: Identifying Confirmation Driving Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch on (IG) and turn the Techstream on [A].
6. Start the engine and warm it up until the ECT reaches 75°C (167°F) or higher [B].
7. Idle the engine for 5 minutes or more [C].
8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].
9. Read the pending DTCs.

   HINT:

   • If a pending DTC is output, the system is malfunctioning.
   • If a pending DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
11. Input the DTC: P0016 or P0018.
12. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [E] through [G].
13. Drive the vehicle for 2 to 3 minutes [E].

    WARNING:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

14. Idle the engine for 5 minutes or more [F].
15. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [G].
16. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
17. Check the DTC judgment result.
18. If the judgment result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs, refer to DTC CHECK / CLEAR .

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

HINT:

• Bank 1 refers to the bank that includes the No. 1 cylinder*.

  *: The No. 1 cylinder is the cylinder which is farthest from the transmission.

• Bank 2 refers to the bank that does not include the No. 1 cylinder.
• Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0016 OR P0018)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG) and turn the tester on.
   3. Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.
   4. Read the DTCs.

      Result

      Display (DTC Output)	Proceed to
      P0016 or P0018	A
      P0016 or P0018 and other DTCs	B

      HINT:

      If any DTCs other than P0016 or P0018 are output, troubleshoot those DTCs first.

   B --> See step 10

   A: Go to next step

2. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE OIL CONTROL VALVE FOR INTAKE CAMSHAFT)
   1. Connect the Techstream to the DLC3.
   2. Start the engine and turn the tester on.
   3. Warm up the engine.
   4. Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the VVT Linear (Bank 1) or Control the VVT Linear (Bank 2).
   5. Check the engine speed while operating the oil control valve using the tester.

      OK

      Tester Operation	Specified Condition
      0%	Normal engine idle speed
      100%	Engine idles roughly or stalls (soon after OCV switched from OFF to ON)

   NG --> See step 4

   OK: Go to next step

3. CHECK WHETHER DTC OUTPUT RECURS (DTC P0016 OR P0018)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG) and turn the tester on.
   3. Clear the DTCs, refer to DTC CHECK / CLEAR .
   4. Start the engine and warm it up.
   5. Drive the vehicle accordance with the driving pattern described in the Confirmation Driving Pattern.
   6. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
   7. Read the pending DTCs using the tester.

      OK

      No DTC output.

   NG --> See step 4

   OK --> END

4. CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN)
   1. Remove the cylinder head covers RH and LH.

      Fig. 18: Identifying Valve Timing Marks
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Turn the crankshaft to align the timing marks of the crankshaft.
   3. Align the notch of the crankshaft pulley to the "0" position.
   4. Check if the timing marks of the camshaft pulley and camshaft bearing cap align.

      TEXT IN ILLUSTRATION
      

      *1	Timing Mark

   5. Turn the crankshaft clockwise 360° if the timing marks do not align. Check if they align once again.

      OK

      The timing marks of the camshaft pulley and the camshaft bearing cap align when the notch of the crankshaft pulley is in the "0" position.

   NG --> See step 11

   OK: Go to next step

5. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (FOR INTAKE CAMSHAFT)
   1. Remove the intake camshaft timing oil control valve.
   2. Measure the resistance according to the value(s) in the table below.

      Fig. 19: Measuring Resistance Between Terminals Of OCV
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Standard resistance

      Tester Connection	Condition	Specified Condition
      1 - 2	20°C (68°F)	6.9 to 7.9 ohms

   3. Apply the positive battery voltage to terminal 1 and the negative battery voltage to terminal 2. Check the valve operation.

      Fig. 20: Applying Positive Battery Voltage To Terminal 1 And The Negative Battery Voltage To Terminal 2
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      OK

      Valve moves quickly.

      TEXT IN ILLUSTRATION
      

      *1	Valve Moves

   4. Reinstall the camshaft timing oil control valve.

   NG --> See step 12

   OK: Go to next step

6. CHECK OIL PIPE AND OIL CONTROL VALVE FILTER
   1. Remove the oil pipe No. 1 or oil pipe assembly.

      Fig. 21: Locating Oil Pipe No. 1 Assembly & Bolts
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Remove the oil control valve filter.
   3. Check that the filter and pipe are not clogged.

      TEXT IN ILLUSTRATION
      

      *1	RH Bank
      *2	LH Bank

      OK

      The filter and pipe are not clogged.

   NG --> REPLACE OIL CONTROL VALVE FILTER OR PIPE

   OK: Go to next step

7. REPLACE CAMSHAFT TIMING GEAR ASSEMBLY

   NEXT: Go to next step

8. CHECK WHETHER DTC OUTPUT RECURS
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG) and turn the tester on.
   3. Clear the DTCs, refer to DTC CHECK / CLEAR .
   4. Start the engine and warm it up.
   5. Drive the vehicle accordance with the driving pattern described in the Confirmation Driving Pattern.
   6. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
   7. Read the pending DTCs using the tester.

      OK

      No DTC output.

      HINT:

      DTC P0016 or P0018 is output when foreign objects in engine oil are caught in some parts of the system. These codes will stay output even if the system returns to normal after a short time. These foreign objects are then captured by the oil filter, thus eliminating the source of the problem.

   NG --> See step 9

   OK --> END

9. REPLACE ECM. Refer to COMPONENTS
10. GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART
11. ADJUST VALVE TIMING. Refer to REASSEMBLY
12. REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY. Refer to REMOVAL

DTC P0017: Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor B); DTC P0019: Crankshaft Position - Camshaft Position Correlation (Bank 2 Sensor B)

DESCRIPTION

Refer to DTC P0335, refer to DTC P0335: Crankshaft Position Sensor "A" Circuit; DTC P0339: Crankshaft Position Sensor "A" Circuit Intermittent.

DTC No.	DTC Detection Condition	Trouble Area
P0017	Deviations in crankshaft position sensor and VVT sensor 1 (for exhaust camshaft) 1 signals (2 trip detection logic)	Valve timing Camshaft timing oil control valve for exhaust camshaft Camshaft timing oil control valve filter Exhaust camshaft timing gear assembly ECM
P0019	Deviations in crankshaft position sensor and VVT sensor 2 (for exhaust camshaft) 2 signals (2 trip detection logic)

MONITOR DESCRIPTION

The ECM checks valve timing (VVT learning value) on the exhaust side while the engine is running at a low speed, in order to monitor the gap between current and target valve timings on the exhaust side. The VVT learning value is calculated from the positions of the camshaft and crankshaft. The camshaft will come to the most retarded position when the engine is running at a low speed. If the camshaft position is normal, the VVT learning value should be within the specified range. If the VVT learning value is not within the specified range, the ECM determines this as a malfunction.

MONITOR STRATEGY

Related DTCs	P0017: Exhaust valve timing misalignment at idling (bank 1) P0019: Exhaust valve timing misalignment at idling (bank 2)
Required Sensors / Components (Main)	Timing chain/belt
Required Sensors / Components (Related)	None
Frequency of Operation	Once per driving cycle
Duration	Less than 60 seconds
MIL Operation	2 driving cycles
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

ALL:

The monitor will run whenever these DTCs are not present	P0013, P0023 (Exhaust OCV bank 1, 2) P0102, P0103 (MAF meter) P0115, P0117, P0118 (ECT sensor) P0125 (Insufficient ECT for closed loop) P0335 (CKP sensor)
Engine RPM	500 to 1000 RPM

TYPICAL MALFUNCTION THRESHOLDS

One of the following conditions is met:	Condition A, B, C or D
A. VVT learning value at maximum advanced valve timing (Bank 1)	Less than 77°CA
B. VVT learning value at maximum advanced valve timing (Bank 2)	Less than 77°CA
C. VVT learning value at maximum advanced valve timing (Bank 1)	More than 102°CA
D. VVT learning value at maximum advanced valve timing (Bank 2)	More than 102°CA

WIRING DIAGRAM

Refer to DTC P0335, refer to WIRING DIAGRAM.

CONFIRMATION DRIVING PATTERN

Fig. 22: Identifying Confirmation Driving Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch on (IG) and turn the Techstream on [A].
6. Start the engine and warm it up until the ECT reaches 75°C (167°F) or higher [B].
7. Idle the engine for 5 minutes or more [C].
8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].
9. Read the pending DTCs.

   HINT:

   • If a pending DTC is output, the system is malfunctioning.
   • If a pending DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
11. Input the DTC: P0017 or P0019.
12. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [E] through [G].
13. Drive the vehicle for 2 to 3 minutes [E].

    WARNING:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

14. Idle the engine for 5 minutes or more [F].
15. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [G].
16. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
17. Check the DTC judgment result.
18. If the judgment result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs, refer to DTC CHECK / CLEAR .

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

HINT:

• Bank 1 refers to the bank that includes the No. 1 cylinder*.

  *: The No. 1 cylinder is the cylinder which is farthest from the transmission.

• Bank 2 refers to the bank that does not include the No. 1 cylinder.
• Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0017 AND P0019)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG) and turn the tester on.
   3. Select the following menu items: Powertrain / Engine and ECT / Trouble Code.
   4. Read the DTCs.

      Result

      Display (DTC Output)	Proceed to
      P0017 or P0019	A
      P0017 or P0019 and other DTCs	B

      HINT:

      If any DTCs other than P0017 or P0019 are output, troubleshoot those DTCs first.

   B --> See step 9

   A: Go to next step

2. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE OIL CONTROL VALVE FOR EXHAUST CAMSHAFT)
   1. Connect the Techstream to the DLC3.
   2. Start the engine and turn the tester on.
   3. Warm up the engine.
   4. Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the VVT Exhaust Linear (Bank 1) or Control the VVT Exhaust Linear (Bank 2).
   5. Check the engine speed while operating the oil control valve using the tester.

      OK

      Tester Operation	Specified Condition
      0% (Oil control valve OFF)	Normal engine idle speed
      127% (Oil control valve ON)	Engine idles roughly or stalls (soon after OCV switched from OFF to ON)

   NG --> See step 4

   OK: Go to next step

3. CHECK WHETHER DTC OUTPUT RECURS (DTC P0017 OR P0019)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG) and turn the tester on.
   3. Clear the DTCs, refer to DTC CHECK / CLEAR .
   4. Start the engine and warm it up.
   5. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
   6. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
   7. Read the pending DTCs using the tester.

      OK

      No DTC output.

   NG --> See step 4

   OK --> END

4. CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMP TEETH ON TIMING CHAIN)
   1. Remove the cylinder head covers RH and LH.

      Fig. 23: Identifying Valve Timing Marks
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Turn the crankshaft to align the matchmarks of the crankshaft.
   3. Align the notch of the crankshaft pulley to the "0" position.
   4. Check if the matchmarks of the camshaft pulley and camshaft bearing cap align.

      TEXT IN ILLUSTRATION
      

      *1	Timing Mark

   5. Turn the crankshaft clockwise by 360° if the matchmarks do not align. Check if they align once again.

      OK

      The matchmarks of the camshaft pulley and the camshaft bearing cap align when the notch of the crankshaft pulley is in the "0" position.

   NG --> See step 10

   OK: Go to next step

5. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (FOR EXHAUST CAMSHAFT)
   1. Remove the exhaust camshaft timing oil control valve.
   2. Measure the resistance according to the value(s) in the table below.

      Fig. 24: Measuring Resistance Between Terminals Of OCV
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Standard resistance

      Tester Connection	Condition	Specified Condition
      1 - 2	20°C (68°F)	6.9 to 7.9 ohms

   3. Apply the positive battery voltage to terminal 1 and the negative battery voltage to terminal 2. Check the valve operation.

      Fig. 25: Applying Positive Battery Voltage To Terminal 1 And The Negative Battery Voltage To Terminal 2
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      OK

      Valve moves quickly.

      TEXT IN ILLUSTRATION
      

      *1	Valve Moves

   4. Reinstall the camshaft timing oil control valve.

   NG --> See step 11

   OK: Go to next step

6. CHECK OIL CONTROL VALVE FILTER AND PIPE
   1. Remove the oil pipe No. 1 or oil pipe assembly.

      Fig. 26: Locating Oil Pipe No. 1 Assembly & Bolts
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Remove the oil control valve filter.
   3. Check that the filter and pipe are not clogged.

      TEXT IN ILLUSTRATION
      

      *1	RH Bank
      *2	LH Bank

      OK

      The filter and pipe are not clogged.

   NG --> REPLACE OIL CONTROL VALVE FILTER OR PIPE

   OK: Go to next step

7. REPLACE CAMSHAFT TIMING GEAR ASSEMBLY

   NEXT: Go to next step

8. CHECK WHETHER DTC OUTPUT RECURS
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG) and turn the tester on.
   3. Clear the DTCs, refer to DTC CHECK / CLEAR .
   4. Start the engine and warm it up.
   5. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
   6. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
   7. Confirm that no DTC pending is set using the tester.

      OK

      No DTC output.

      HINT:

      DTC P0017 or P0019 is output when foreign objects in engine oil are caught in some parts of the system. These codes will stay registered even if the system returns to normal after a short time. These foreign objects are then captured by the oil filter, thus eliminating the source of the problem.

   NG --> See step 12

   OK --> END

9. GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART
10. ADJUST VALVE TIMING. Refer to REASSEMBLY
11. REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY. Refer to REMOVAL
12. REPLACE ECM. Refer to COMPONENTS

DTC P0031: Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1); DTC P0032: Oxygen (A/F) Sensor Heater Control Circuit High (Bank 1 Sensor 1); DTC P0051: Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 2 Sensor 1); DTC P0052: Oxygen (A/F) Sensor Heater Control Circuit High (Bank 2 Sensor 1); DTC P101D: A/F Sensor Heater Circuit Performance Bank 1 Sensor 1 Stuck ON; DTC P103D: A/F Sensor Heater Circuit Performance Bank 2 Sensor 1 Stuck ON

CAUTION / NOTICE / HINT

HINT:

• Although the DTC titles say the oxygen sensor, these DTCs relate to the air fuel ratio sensor.
• Sensor 1 refers to the sensor mounted in front of the three-way catalytic converter and located near the engine assembly.

DESCRIPTION

Refer to DTC P2195, refer to DESCRIPTION .

HINT:

• When any of these DTCs are set, the ECM enters fail-safe mode. The ECM turns off the air fuel ratio sensor heater in fail-safe mode. Fail-safe mode continues until the ignition switch is turned off.
• The ECM provides a pulse width modulated control circuit to adjust the current through the heater. The air fuel ratio sensor heater circuit uses a relay on the +B side of the circuit.

Fig. 27: Identifying Oxygen (A/F) Sensor Heater Control Circuit Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DTC No.	DTC Detection Condition	Trouble Area
P0031 P0051	Air fuel ratio sensor heater (bank 1, 2, sensor 1) current less than 0.8 A (1 trip detection logic)	Open in air fuel ratio sensor heater circuit Air fuel ratio sensor heater (Bank 1, 2 Sensor 1) A/F relay ECM
P0032 P0052	Air-Fuel Ratio (A/F) sensor heater (bank 1, 2, sensor 1) current fail (1 trip detection logic)	Short in air fuel ratio sensor heater circuit Air fuel ratio sensor heater (Bank 1, 2 Sensor 1) A/F relay ECM
P101D P103D	The heater current is higher than the specified value while the heater is no operating (1 trip detection logic)	ECM

HINT:

• Bank 1 refers to the bank that includes cylinder No. 1.
• Bank 2 refers to the bank that does not include cylinder No. 1.
• Sensor 1 refers to the closest sensor to the engine assembly.
• Sensor 2 refers to the furthest sensor away from the engine assembly.

MONITOR DESCRIPTION

The ECM uses information from the air fuel ratio sensor to regulate the air-fuel ratio and keep it close to the stoichiometric level. This maximizes the ability of the three-way catalytic converter to purify the exhaust gas.

The air fuel ratio sensor detects oxygen levels in the exhaust gas and transmits the information to the ECM. The inner surface of the sensor element is exposed to the outside air. The outer surface of the sensor element is exposed to the exhaust gas. The sensor element is made of platinum coated zirconia and includes an integrated heating element.

The zirconia element generates small voltage when there is a large difference in the oxygen concentrations between the exhaust gas and outside air. The platinum coating amplifies this voltage generation.

The air fuel ratio sensor is more efficient when heated. When the exhaust gas temperature is low, the sensor cannot generate useful voltage signals without supplementary heating. The ECM regulates the supplementary heating using a duty-cycle approach to adjust the average current in the sensor heater element. If the heater current is outside the normal range, the signal transmitted by the air fuel ratio sensor will be inaccurate, as a result, the ECM will be unable to regulate air-fuel ratio properly.

When the current in the air fuel ratio sensor heater is outside the normal operating range, the ECM interprets this as a malfunction in the sensor heater and sets a DTC.

Example:

• The ECM sets DTC P0032 or P0052 when the current in the air fuel ratio sensor heater is fail. Conversely, when the heater current is less than 0.8 A, DTC P0031 or P0051 is set.

MONITOR STRATEGY

Related DTCs	P0031: Air fuel ratio sensor heater (Bank 1) range check (Low current) P0032: Air fuel ratio sensor heater (Bank 1) range check (High current) P0051: Air fuel ratio sensor heater (Bank 2) range check (Low current) P0052: Air fuel ratio sensor heater (Bank 2) range check (High current) P101D: Air fuel ratio sensor heater (for bank 1) performance P103D: Air fuel ratio sensor heater (for bank 2) performance
Required sensors / components (Main)	Air fuel ratio sensor heater (bank 1 and bank 2)
Required sensors / components (Related)	-
Frequency of operation	Continuous
Duration	10 seconds
MIL operation	Immediate
Sequence operation	None

TYPICAL ENABLING CONDITIONS

ALL:

The monitor will run whenever these DTCs are not present

None

P0031 AND P0051:

Battery voltage	10.5 V or more
Heater output duty	50% or more
Time after engine starts	10 seconds or more
Active heater off control	Not operating
Active heater on control	Not operating

P0032 AND P0052:

Battery voltage	10.5 V or more
Heater output duty	More than 0%
Time after engine start	10 seconds or more
Active heater off control	Not operating
Active heater on control	Not operating

P101D AND P103D:

Monitor runs whenever following DTCs not stored	P0031, P0051 (Air fuel ratio sensor heater)
Battery voltage	10.5 V or more
Time after heater ON	5 seconds or more
Active heater OFF control	Not operating
Active heater ON control	Not operating
Air fuel ratio sensor duty-cycle	10 to 60%
Air fuel ratio sensor heater ON current	0.8% or more

TYPICAL MALFUNCTION THRESHOLDS

P0031 AND P0051:

Both of the following conditions are met:	Condition A and B
A. Heater output	ON
B. Heater current	Less than 0.8 A

P0032 AND P0052:

Both of the following conditions are met:	Condition A and B
A. Heater output	ON
B. Hybrid IC high current limit port	Fail

COMPONENT OPERATING RANGE

P0031 AND P0051:

Air fuel ratio sensor heater current

0.8 A or more

P0032 AND P0052:

Heater output	ON
Hybrid IC high current limiter port	Fail

P101D AND P103D:

Hybrid IC high current limiter port

Fail

MONITOR RESULT

Refer to CHECKING MONITOR STATUS, refer to CHECKING MONITOR STATUS .

WIRING DIAGRAM

Refer to DTC P2195, refer to WIRING DIAGRAM .

CONFIRMATION DRIVING PATTERN

Fig. 28: Identifying Confirmation Driving Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn the Techstream on.
3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch on (IG) and turn the Techstream on [A].
6. Start the engine and idle it for 5 minutes or more [B].
7. With the vehicle stationary, depress the accelerator pedal and maintain an engine speed of 3000 RPM for 1 minute [C].
8. Idle the engine for 5 minutes or more [D].
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [E].
10. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P0031, P0032, P0051, P0052, P101D or P103D.
13. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
14. If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [B] through [E] again.
15. If no pending DTC is output, perform a universal trip and check for permanent DTCs, refer to DTC CHECK / CLEAR .

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

NOTE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT:

• Bank 1 refers to the bank that includes the No. 1 cylinder*.

  *: The No. 1 cylinder is the cylinder which is farthest from the transmission.

• Bank 2 refers to the bank that does not include the No. 1 cylinder.
• Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)
   1. Disconnect the air fuel ratio sensor connector.

      Fig. 29: Identifying Air Fuel Ratio Sensor Connector
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Bank 1

      Bank 2

      Tester Connection	Condition	Specified Condition
      1 (HA1A) - 2 (+B)	20°C (68°F)	1.6 to 3.2 ohms
      1 (HA1A) - 4 (A1A-)	Always	10 kohms or higher

      Tester Connection	Condition	Specified Condition
      1 (HA2A) - 2 (+B)	20°C (68°F)	1.6 to 3.2 ohms
      1 (HA2A) - 4 (A2A-)	Always	10 kohms or higher

      TEXT IN ILLUSTRATION
      

      *1	Bank 1
      *2	Bank 2
      *a	Component without harness connected (Air Fuel Ratio Sensor)

   3. Reconnect the air fuel ratio sensor connector.

   NG --> See step 5

   OK: Go to next step

2. CHECK TERMINAL VOLTAGE (+B OF AIR FUEL RATIO SENSOR)
   1. Disconnect the air fuel ratio sensor connector.

      Fig. 30: Identifying Air Fuel Ratio Sensor Connector
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Turn the ignition switch on (IG).
   3. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Bank 1

      Bank 2

      Tester Connection	Switch Condition	Specified Condition
      B20-2 (+B) - Body ground	Ignition switch on (IG)	9 to 14 V

      Tester Connection	Switch Condition	Specified Condition
      B19-2 (+B) - Body ground	Ignition switch on (IG)	9 to 14 V

      TEXT IN ILLUSTRATION
      

      *1	Bank 1
      *2	Bank 2
      *a	Front view of wire harness connector (to Air Fuel Ratio Sensor)

   4. Reconnect the air fuel ratio sensor connector.

   NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (A/F RELAY - AIR FUEL RATIO SENSOR)

   OK: Go to next step

3. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR RELAY - ECM)
   1. Disconnect the air fuel ratio sensor connector.
   2. Disconnect the ECM connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)

      Bank 1

      Bank 2

      Tester Connection	Condition	Specified Condition
      B20-1 (HA1A) - B48-17 (HA1A)	Always	Below 1 ohms

      Tester Connection	Condition	Specified Condition
      B19-1 (HA2A) - B48-19 (HA2A)	Always	Below 1 ohms

      Standard resistance (Check for short)

      Bank 1

      Bank 2

      Tester Connection	Condition	Specified Condition
      B20-1 (HA1A) or B48-17 (HA1A) - Body ground	Always	10 kohms or higher

      Tester Connection	Condition	Specified Condition
      B19-1 (HA2A) or B48-19 (HA2A) - Body ground	Always	10 kohms or higher

   4. Reconnect the ECM connector.
   5. Reconnect the air fuel ratio sensor connector.

   NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (AIR FUEL RATIO SENSOR - ECM)

   OK: Go to next step

4. CHECK WHETHER DTC OUTPUT RECURS
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG).
   3. Turn the tester on.
   4. Clear the DTCs, refer to DTC CHECK / CLEAR .
   5. Start the engine.
   6. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
   7. Select the following menu items: Powertrain / Engine and ECT / Trouble Code.
   8. Read the DTCs.

      Result

      Display (DTC Output)	Proceed to
      No output	A
      P0031, P0032, P0051, P0052, P101D and/or P103D	B

   B --> See step 6

   A --> See step 7

5. REPLACE AIR FUEL RATIO SENSOR. Refer to COMPONENTS
6. REPLACE ECM. Refer to COMPONENTS
7. CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS

DTC P0037: Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2); DTC P0038: Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 2); DTC P0057: Oxygen Sensor Heater Control Circuit Low (Bank 2 Sensor 2); DTC P0058: Oxygen Sensor Heater Control Circuit High (Bank 2 Sensor 2); DTC P0141: Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 2); DTC P0161: Oxygen Sensor Heater Circuit Malfunction (Bank 2 Sensor 2); DTC P102D: O2 Sensor Heater Circuit Performance Bank 1 Sensor 2 Stuck ON; DTC P105D: O2 Sensor Heater Circuit Performance Bank 2 Sensor 2 Stuck ON

CAUTION / NOTICE / HINT

HINT:

Sensor 2 refers to the sensor mounted behind the three-way catalytic converter and located furthest from the engine assembly.

DESCRIPTION

Refer to DTC P0136, refer to DTC P0136: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2); DTC P0137: Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 2); DTC P0138: Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 2); DTC P0139: Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 2); DTC P0156: Oxygen Sensor Circuit Malfunction (Bank 2 Sensor 2); DTC P0157: Oxygen Sensor Circuit Low Voltage (Bank 2 Sensor 2); DTC P0158: Oxygen Sensor Circuit High Voltage (Bank 2 Sensor 2); DTC P0159: Oxygen Sensor Circuit Slow Response (Bank 2 Sensor 2).

HINT:

When any of these DTCs are set, the ECM enters fail-safe mode. The ECM turns off the heated oxygen sensor heater in fail-safe mode. Fail-safe mode continues until the ignition switch is turned off.

Fig. 31: Identifying Reference System Diagram Of Bank 1 Sensor 2
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DTC No.	DTC Detection Condition	Trouble Area
P0037 P0057	Heated oxygen sensor heater current is less than 0.3 A (1 trip detection logic)	Open in heated oxygen sensor heater circuit Heated oxygen sensor heater ECM
P0038 P0058	Heated oxygen sensor heater current is more than specified value while the heater is operating (1 trip detection logic)	Open in heated oxygen sensor heater circuit Heated oxygen sensor heater ECM
P0141 P0161	Cumulative heater resistance correction value exceeds the acceptable threshold (2 trip detection logic)	Heated oxygen sensor ECM
P102D P105D	The heater current is higher than the specified value while the heater is not operating (1 trip detection logic)	ECM

HINT:

• Bank 1 refers to the bank that includes cylinder No. 1.
• Bank 2 refers to the bank that does not include cylinder No. 1.
• Sensor 1 refers to the sensor closest to the engine assembly.
• Sensor 2 refers to the sensor furthest away from the engine assembly.

MONITOR DESCRIPTION

The sensing position of the heated oxygen sensor has a zirconia element which is used to detect the oxygen concentration in the exhaust gas. If the zirconia element is at the appropriate temperature, and the difference between the oxygen concentrations surrounding the inside and outside surfaces of the sensor is large, the zirconia element generates voltage signals. In order to increase the oxygen concentration detecting capacity of the zirconia element, the ECM supplements the heat from the exhaust with heat from a heating element inside the sensor.

Heated oxygen sensor heater range check (P0037, P0038, P0057 and P0058):

• The ECM monitors the current applied to the heated oxygen sensor heater to check the heater for malfunctions. If the current is below the threshold value, the ECM will determine that there is an open circuit in the heater. If the current is above the threshold value, the ECM will determine that there is a short circuit in the heater.

  Example:

  • The ECM sets DTC P0038 or P0058 when the current in the heated oxygen sensor heater is more than 2 A. Conversely, when the heater current is less than 0.3 A, DTC P0037 or P0057 is set.

Heated oxygen sensor heater performance (P0141 and P0161):

• After the accumulated heater ON time exceeds 100 seconds, the ECM calculates the heater resistance using the battery voltage and the current applied to the heater. If the resistance is above the threshold value, the ECM will determine that there is a malfunction in the heated oxygen sensor heater and set DTC P0141 and P0161.

MONITOR STRATEGY

Related DTCs	P0037: Heated oxygen sensor heater (bank 1) open/short (Low electrical current) P0038: Heated oxygen sensor heater (bank 1) open/short (High electrical current) P0057: Heated oxygen sensor heater (bank 2) open/short (Low electrical current) P0058: Heated oxygen sensor heater (bank 2) open/short (High electrical current) P0141: Heated oxygen sensor heater performance (bank 1 sensor 2) P0161: Heated oxygen sensor heater performance (bank 2 sensor 2) P102D: Heated oxygen sensor heater stuck ON (bank 1 sensor 2) P105D: Heated oxygen sensor heater stuck ON (bank 2 sensor 2)
Required Sensors / Components (Main)	Heated oxygen sensor heater (bank 1, 2 and 2)
Required Sensors / Components (Related)	Vehicle speed sensor
Frequency of Operation	Continuous
Duration	0.5 seconds: P0037, P0057, P102D and P105D 2 seconds: P0038 and P0058 10 seconds: P0141 and P0161
MIL Operation	Immediate: P0037, P0038, P0057 and P0058 2 driving cycles: P0141 and P0161
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

ALL:

The monitor will run whenever these DTCs are not present

None

P0037 AND P0057:

Battery voltage

More than 10.5 V

P0038 AND P0058 (CASE 1):

Battery voltage	More than 10.5 V
Engine	Running
Starter	OFF

P0038 AND P0058 (CASE 2):

Battery voltage

More than 10.5 V

P0141 AND P0161:

One of the following conditions is met:	Condition A or B
A. All of the following conditions are met:	Conditions 1, 2, 3, 4 and 5
1. Battery voltage	10.5 V or more
2. Fuel cut	OFF
3. Time after fuel cut ON to OFF	30 seconds or more
4. Accumulated heater ON time	100 seconds or more
5. Learned heater OFF current operation	Completed
B. Duration that rear heated oxygen sensor impedance is less than 15 kohms	2 seconds or more

P102D AND P105D:

Monitor runs whenever following DTCs not stored	P0031, P0032, P0051, P0052 (Air fuel ratio sensor heater) P0037, P0038, P0057, P0058 (Rear oxygen sensor heater)
Battery voltage	10.5 V or more
Engine	Running
Starter	OFF
Catalyst active A/F complete	Not operating
Time after heater ON	10.5 seconds or more

HINT:

When the values for the Data List items. O2 Heater Curr Val B1S2 and O2 Heater Curr Val B2S2 are not 0 A, the heater is on.

TYPICAL MALFUNCTION THRESHOLDS

P0037 AND P0057:

Heater Current - Learned heater OFF current

Less than 0.3 A

P0038 AND P0058:

Both of the following conditions are met:	Condition A and B
A. Hybrid IC high current limiter monitor input	Fail
B. Heater output	ON

P0141 AND P0161 (HEATER PERFORMANCE MONITOR CHECK):

Accumulated heater resistance

Varies with sensor element temperature (Example: More than 23 ohms)

P102D AND P105D:

Heated oxygen sensor heater ON current

1 A or more

COMPONENT OPERATING RANGE

Heated oxygen sensor heater current

0.3 to 2 A (when engine idles, heated oxygen sensor warmed up and battery voltage 11 to 14 V)

MONITOR RESULT

Refer to CHECKING MONITOR STATUS, refer to CHECKING MONITOR STATUS .

WIRING DIAGRAM

Refer to DTC P0136, refer to WIRING DIAGRAM.

CONFIRMATION DRIVING PATTERN

Fig. 32: Identifying Confirmation Driving Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn the Techstream on.
3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch on (IG) and turn the Techstream on [A].
6. Start the engine and idle it for 5 minutes or more [B].
7. With the vehicle stationary, depress the accelerator pedal and maintain an engine speed of 3000 RPM for 1 minute [C].
8. Idle the engine for 5 minutes or more [D].
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [E].
10. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P0037, P0038, P0057, P0058, P0141, P0161, P102D or P105D.
13. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
14. If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [B] through [E] again.
15. If no pending DTC is output, perform a universal trip and check for permanent DTCs, refer to DTC CHECK / CLEAR .

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

NOTE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT:

• Bank 1 refers to the bank that includes the No. 1 cylinder*.

  *: The No. 1 cylinder is the cylinder which is farthest from the transmission.

• Bank 2 refers to the bank that does not include the No. 1 cylinder.
• If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
• Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)
   1. Disconnect the heated oxygen sensor connector.

      Fig. 33: Identifying Heated Oxygen Sensor Connector
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Bank 1

      Bank 2

      Tester Connection	Condition	Specified Condition
      1 (HT1B) - 2 (+B)	20°C (68°F)	11 to 16 ohms
      1 (HT1B) - 4 (E2)	Always	10 kohms or higher

      Tester Connection	Condition	Specified Condition
      1 (HT2B) - 2 (+B)	20°C (68°F)	11 to 16 ohms
      1 (HT2B) - 4 (E2)	Always	10 kohms or higher

      TEXT IN ILLUSTRATION
      

      *1	Bank 1
      *2	Bank 2
      *a	Component without harness connected (Heated Oxygen Sensor)

   3. Reconnect the heated oxygen sensor connector.

   NG --> See step 5

   OK: Go to next step

2. CHECK TERMINAL VOLTAGE (+B TERMINAL OF HEATED OXYGEN SENSOR)
   1. Disconnect the heated oxygen sensor connector.

      Fig. 34: Identifying Heated Oxygen Sensor Connector
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Turn the ignition switch on (IG).
   3. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Bank 1

      Bank 2

      Tester Connection	Switch Condition	Specified Condition
      P1-2 (+B) - Body ground	Ignition switch on (IG)	9 to 14 V

      Tester Connection	Switch Condition	Specified Condition
      B39-2 (+B) - Body ground	Ignition switch on (IG)	9 to 14 V

      TEXT IN ILLUSTRATION
      

      *1	Bank 1
      *2	Bank 2
      *a	Front view of wire harness connector (to Heated Oxygen Sensor)

   4. Reconnect the heated oxygen sensor connector.

   NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI RELAY - HEATED OXYGEN SENSOR)

   OK: Go to next step

3. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM)
   1. Disconnect the heated oxygen sensor connector.
   2. Disconnect the ECM connectors.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)

      Bank 1

      Bank 2

      Tester Connection	Condition	Specified Condition
      P1-1 (HT1B) - B48-12 (HT1B)	Always	Below 1 ohms

      Tester Connection	Condition	Specified Condition
      B39-1 (HT2B) - B48-13 (HT2B)	Always	Below 1 ohms

      Standard resistance (Check for short)

      Bank 1

      Bank 2

      Tester Connection	Condition	Specified Condition
      P1-1 (HT1B) or B48-12 (HT1B) - Body ground	Always	10 kohms or higher

      Tester Connection	Condition	Specified Condition
      B39-1 (HT2B) or B48-13 (HT2B) - Body ground	Always	10 kohms or higher

   4. Reconnect the ECM connectors.
   5. Reconnect the heated oxygen sensor connector.

   NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (HEATED OXYGEN SENSOR - ECM)

   OK: Go to next step

4. CHECK WHETHER DTC OUTPUT RECURS
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG).
   3. Turn the tester on.
   4. Clear the DTCs, refer to DTC CHECK / CLEAR .
   5. Start the engine.
   6. Drive the vehicle accordance with the driving pattern described in the Confirmation Driving Pattern.
   7. Select the following menu items: Powertrain / Engine and ECT / Trouble Code.
   8. Read the DTCs.

      Result

      Display (DTC Output)	Proceed to
      No output	A
      P0037, P0038, P0057, P0058, P0141 and/or P0161	B

   B --> See step 6

   A --> See step 7

5. REPLACE HEATED OXYGEN SENSOR. Refer to COMPONENTS
6. REPLACE ECM. Refer to COMPONENTS
7. CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS

DTC P0101: Mass or Volume Air Flow Circuit Range / Performance Problem

DESCRIPTION

Refer to DTC P0102, refer to DESCRIPTION.

DTC No.	DTC Detection Condition	Trouble Area
P0101	Conditions (a), (b), (c), (d) and (e) continue for more than 10 seconds (2 trip detection logic): (a) Engine running (b) Engine coolant temperature 70°C (158°F) or higher (c) Throttle Position (TP) sensor voltage 0.24 V to 2.0 V (d) Average engine load value ratio less than 0.84, or more than 1.44 (varies with estimated engine load) Average engine load value ratio = Average engine load based on MAF meter output / Average engine load estimated from driving conditions (e) Average air-fuel ratio less than -20%, or more than 20%	Mass Air Flow (MAF) meter Air induction system PCV hose connections

MONITOR DESCRIPTION

The mass air flow meter is a sensor that measures the amount of air flowing through the throttle valve. The ECM uses this information to determine the fuel injection time and to provide an appropriate air fuel ratio.

Inside the mass air flow meter, there is a heated platinum wire which is exposed to the flow of intake air. By applying a specific electrical current to the wire, the ECM heats it to a specific temperature. The flow of incoming air cools both the wire and an internal thermistor, changing their resistance. To maintain a constant current value, the ECM varies the voltage applied to these components of the mass air flow meter. The voltage level is proportional to the air flow through the sensor, and the ECM uses it to calculate the intake air volume.

If there is a defect in the sensor, or an open or short in the circuit, the voltage level deviates from the normal operating range. The ECM interprets this deviation as a malfunction in the mass air flow meter and sets the DTC.

Example:

• If the voltage is more than 2.2 V, or less than 0.73 V while idling, the ECM determines that there is a malfunction in the mass air flow meter and sets the DTC.

MONITOR STRATEGY

Related DTCs	P0101: Mass air flow meter rationality
Required Sensors / Components (Main)	Mass air flow meter
Required Sensors / Components (Related)	Crankshaft position sensor, engine coolant temperature sensor and throttle position sensor
Frequency of Operation	Continuous
Duration	10 times
MIL Operation	2 driving cycles
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever these DTCs are not present	None
Throttle position (Throttle position sensor voltage)	0.24 V to 2 V
Engine	Running
Battery voltage	10.5 V or more
Engine coolant temperature	70°C (158°F) or more
Intake air temperature sensor current (P0112, P0113)	OK
Engine coolant temperature sensor current (P0115, P0117, P0118)	OK
Crankshaft position sensor current (P0335)	OK
Throttle position sensor current (P0120, P0121, P0122, P0123)	OK
Fuel tank pressure sensor (P0452, P0453)	OK
EVAP leak detection pump (P2401, P2402)	OK
EVAP vent valve (P2419, P2420)	OK

TYPICAL MALFUNCTION THRESHOLDS

Averaged air-fuel ratio	Less than -20%, or more than 20%
Averaged engine load	Less than 0.84 or more than 1.44

WIRING DIAGRAM

Refer to DTC P0102, refer to WIRING DIAGRAM.

CONFIRMATION DRIVING PATTERN

Fig. 35: Confirmation Driving Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG).
3. Turn the Techstream on.
4. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
5. Turn the ignition switch off and wait for at least 30 seconds.
6. Turn the ignition switch on (IG) and turn the Techstream on.
7. Start the engine and warm it up until the engine coolant temperature reaches 70°C (158°F) or higher [A].
8. Drive the vehicle at approximately 80 km/h (50 mph) to 112 km/h (70 mph) for 5 minutes or more [B].

   WARNING:

   When performing the confirmation driving pattern, obey all speed limits and traffic laws.

   HINT:

   Drive while keeping the engine load as stable as possible.

9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
10. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P0101.
13. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [B] through [C] again.
14. If no pending DTC is output, perform a universal trip and check for permanent DTCs, refer to DTC CHECK / CLEAR .

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

HINT:

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0101)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG).
   3. Turn the tester on.
   4. Select the following menu items: Powertrain / Engine and ECT / Trouble Code.
   5. Read the DTCs.

      Result

      Display (DTC Output)	Proceed to
      P0101 and other DTCs	A
      P0101	B

      HINT:

      If any DTCs other than P0101 are output, troubleshoot those DTCs first.

   B --> See step 3

   A --> See step 2

2. GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART
3. REPLACE MASS AIR FLOW METER. Refer to COMPONENTS

DTC P0102: Mass or Volume Air Flow Circuit Low Input; DTC P0103: Mass or Volume Air Flow Circuit High Input

DESCRIPTION

The mass air flow meter is a sensor that measures the amount of air flowing through the throttle valve. The ECM uses this information to determine the fuel injection time and to provide appropriate air fuel ratio. Inside the mass air flow meter, there is a heated platinum wire which is exposed to the flow of intake air.

By applying a specific electrical current to the wire, the ECM heats it to a specific temperature. The flow of incoming air cools both the wire and an internal thermistor, changing their resistance. To maintain a constant current value, the ECM varies the voltage applied to these components in the mass air flow meter. The voltage level is proportional to the air flow through the sensor, and the ECM uses it to calculate the intake air volume.

The circuit is constructed so that the platinum hot wire and the temperature sensor provide a bridge circuit, and the power transistor is controlled so that the potentials of A and B remain equal to maintain the predetermined temperature.

HINT:

When any of these DTCs are set, the ECM enters fail-safe mode. During fail-safe mode, the ignition timing is calculated by the ECM, according to the engine RPM and throttle valve position. Fail-safe mode continues until a pass condition is detected.

Fig. 36: Identifying Temperature Sensor Circuit
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DTC No.	DTC Detection Condition	Trouble Area
P0102	Mass air flow meter voltage is below 0.2 V for 3 seconds (1 trip detection logic: Engine speed is less than 4000 RPM) (2 trip detection logic: Engine speed is 4000 RPM or more)	Open in mass air flow meter circuit Short in ground circuit Mass air flow meter ECM
P0103	Mass air flow meter voltage is higher than 4.9 V for 3 seconds (1 trip detection logic: Engine speed is less than 4000 RPM) (2 trip detection logic: Engine speed is 4000 RPM or more)	Short in mass air flow meter circuit (+B circuit) Mass air flow meter ECM

HINT:

When any of these DTCs are set, check the air flow rate by selecting the following menu items: Powertrain / Engine and ECT / Data List / All Data / MAF.

Mass Air Flow Rate (gm/s)	Malfunctions
Approximately 0.0	Open in mass air flow meter power source circuit Open or short in VG circuit
271.0 or more	Open in E2G circuit

MONITOR DESCRIPTION

If there is a defect in the mass air flow meter or an open or short circuit, the voltage level deviates from the normal operating range. The ECM interprets this deviation as a malfunction in the mass air flow meter and sets a DTC.

Example:

• When the sensor voltage output remains less than 0.2 V, or more than 4.9 V, for more than 3 seconds, the ECM sets a DTC.
• If the malfunction is not repaired successfully, a DTC is set 3 seconds after the engine is next started.

MONITOR STRATEGY

Related DTCs	P0102: Mass air flow meter range check (Low voltage) P0103: Mass air flow meter range check (High voltage)
Required Sensors / Components (Main)	Mass air flow meter
Required Sensors / Components (Related)	Crankshaft position sensor
Frequency of Operation	Continuous
Duration	3 seconds
MIL Operation	Immediate: Engine RPM less than 4000 RPM 2 driving cycles: Engine RPM 4000 RPM or more
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever these DTCs are not present

None

TYPICAL MALFUNCTION THRESHOLDS

P0102:

Mass air flow meter voltage

Less than 0.2 V

P0103:

Mass air flow meter voltage

More than 4.9 V

COMPONENT OPERATING RANGE

Mass air flow meter voltage

Between 0.2 V and 4.9 V

WIRING DIAGRAM

Fig. 37: Identifying ECM Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

CONFIRMATION DRIVING PATTERN

Fig. 38: Identifying Confirmation Driving Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn the Techstream on.
3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch on (IG) and turn the Techstream on [A].
6. Start the engine.
7. Idle the engine for 5 seconds [B].
8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
9. Read the pending DTCs.

   HINT:

   • If a pending DTC is output, the system is malfunctioning.
   • If a pending DTC is not output, perform the following procedure.
10. Run the engine at an engine speed of 4000 RPM for 5 seconds [D].
11. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [E].
12. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
13. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
14. Input the DTC: P0102 or P0103.
15. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [B] through [C] again.
16. If no pending DTC is output, perform a universal trip and check for permanent DTCs, refer to DTC CHECK / CLEAR .

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

NOTE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT:

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. READ DTC OUTPUT
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG).
   3. Turn the Techstream on.
   4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
   5. Read the DTCs.

      Result

      Result	Proceed to
      DTC P0102 is output	A
      DTC P0103 is output	B

   B --> See step 5

   A: Go to next step

2. CHECK HARNESS AND CONNECTOR (POWER SOURCE VOLTAGE)
   1. Disconnect the mass air flow meter connector.

      Fig. 39: Identifying Mass Air Flow Meter Connector
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Turn the ignition switch on (IG).
   3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection	Switch Condition	Specified Condition
      B10-3 (+B) - Body ground	Ignition switch on (IG)	11 to 14 V

      TEXT IN ILLUSTRATION
      

      *a	Front view of wire harness connector (to Mass Air Flow Meter)

   4. Reconnect the mass air flow meter connector.

   NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MASS AIR FLOW METER - EFI MAIN RELAY)

   OK: Go to next step

3. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)
   1. Disconnect the mass air flow meter connector.
   2. Disconnect the ECM connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection	Condition	Specified Condition
      B10-5 (VG) - B50-14 (VG)	Always	Below 1 ohms
      B10-4 (E2G) - B50-13 (E2G)	Always	Below 1 ohms

      Standard Resistance (Check for Short)

      Tester Connection	Condition	Specified Condition
      B10-5 (VG) or B50-14 (VG) - Body ground	Always	10 kohms or higher

   4. Reconnect the mass air flow meter connector.
   5. Reconnect the ECM connector.

   NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MASS AIR FLOW METER - ECM)

   OK: Go to next step

4. INSPECT MASS AIR FLOW METER
   1. Perform On-vehicle Inspection, refer to ON-VEHICLE INSPECTION .
   2. Inspect the function of the mass air flow meter.
      1. Connect the Techstream to the DLC3.
      2. Turn the ignition switch on (IG).
      3. Turn the Techstream on.
      4. Enter the following menus: Powertrain / Engine / Data List / MAF.
      5. Start the engine.
      6. Check that the reading of the mass air flow meter changes when the engine is raced.

         OK

         The reading changes.

   NG --> See step 8

   OK --> See step 7

5. CHECK HARNESS AND CONNECTOR (SENSOR GROUND)
   1. Disconnect the mass air flow meter connector.

      Fig. 40: Identifying Mass Air Flow Meter Connector
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection	Condition	Specified Condition
      B10-4 (E2G) - Body ground	Always	Below 1 ohms

      TEXT IN ILLUSTRATION
      

      *a	Front view of wire harness connector (to Mass Air Flow Meter)

   3. Reconnect the mass air flow meter connector.

   NG --> See step 6

   OK --> See step 8

6. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)
   1. Disconnect the mass air flow meter connector.
   2. Disconnect the ECM connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection	Condition	Specified Condition
      B10-4 (E2G) - B50-13 (E2G)	Always	Below 1 ohms

   4. Reconnect the mass air flow meter connector.
   5. Reconnect the ECM connector.

   NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MASS AIR FLOW METER - ECM)

   OK --> See step 7

7. REPLACE ECM. Refer to COMPONENTS
8. REPLACE MASS AIR FLOW METER. Refer to REMOVAL

DTC P0111: Intake Air Temperature Sensor Gradient Too High

DESCRIPTION

Fig. 41: Intake Air Temperature Sensor Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

• The intake air temperature sensor, mounted on the mass air flow meter, monitors the intake air temperature. The intake air temperature sensor has a built-in thermistor with a resistance that varies according to the temperature of the intake air. When the intake air temperature becomes low, the resistance of the thermistor increases. When the temperature becomes high, the resistance drops. These variations in resistance are transmitted to the ECM as voltage changes (seeFig. 1).
• The intake air temperature sensor is powered by a 5 V supply from the THA terminal of the ECM, via resistor R.
• Resistor R and the intake air temperature sensor are connected in series. When the resistance value of the intake air temperature sensor changes according to changes in the intake air temperature, the voltage at terminal THA also varies. Based on this signal, the ECM increases the fuel injection volume when the engine is cold to improve driveability.

DTC No.	DTC Detection Condition	Trouble Area
P0111	The intake air temperature rise is large, from the previous trip warm-up to the following trip.(2 trip detection logic) When the change in the intake air temperature after engine start is less than the threshold value.	Mass air flow meter assembly

MONITOR DESCRIPTION

The ECM performs OBD II monitoring based on the values from the intake air temperature sensor. If there is no change in the sensor value, the ECM will not be able to perform OBD II monitoring or will misdiagnose that there is a malfunction in the sensor. The ECM detects the stuck intake air temperature sensor value by performing monitoring after the ignition switch is turned off or the ignition is started (short soak or long soak).

MONITOR STRATEGY

Related DTCs	P0111: Intake air temperature sensor rationality (After engine stop) P0111: Intake air temperature sensor rationality (After cold engine start)
Required Sensors / Components (Main)	Intake Air Temperature (IAT) sensor
Required Sensors / Components (Sub)	-
Frequency of Operation	Once per driving cycle
Duration	5 hours
MIL Operation	2 driving cycles
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

ALL:

The monitor will run whenever these DTCs are not present

None

AFTER ENGINE STOP:

Time after engine start	10 seconds or more
Battery voltage	10.5 V or more
IAT sensor circuit (P0112, P0113)	OK
ECT sensor circuit (P0115, P0117, P0118)	OK
MAF meter circuit (P0102, P0103)	OK
ECT change since engine stop	-40°C (40°F) or more
Accumulated MAF amount before engine stop	2393 g or more
Key-off duration	35 minutes

AFTER COLD ENGINE START:

Key-off duration	5 hours
Time after engine start	10 seconds or more
IAT sensor circuit (P0112, P0113)	OK
ECT sensor circuit (P0115, P0117, P0118)	OK
MAF meter circuit (P0102, P0103)	OK
ECT	70°C (158°F) or more
Accumulated MAF amount	2393 g or more
One of the following conditions 1 or 2 is met:	-
1. Duration while engine load is low	120 seconds or more
2. Duration while engine load is high	10 seconds or more

TYPICAL MALFUNCTION THRESHOLDS

AFTER ENGINE STOP:

Intake air temperature change

Less than 1°C (33.8°F)

AFTER COLD ENGINE START:

Intake air temperature change

Less than 1°C (33.8°F)

WIRING DIAGRAM

Refer to DTC P0112, refer to WIRING DIAGRAM.

CONFIRMATION DRIVING PATTERN

Fig. 42: Identifying Confirmation Driving Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn the Techstream on.
3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch on (IG) and turn the Techstream on [A].
6. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [B].
7. Idle the engine for 5 minutes or more [C].

   HINT:

   During steps [A] through [C], if the change in the intake air temperature is less than 1°C (1.8°F), the intake air temperature sensor (mass air flow meter assembly) is malfunctioning. It is not necessary to continue this procedure.

8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].
9. Read the pending DTCs.

   HINT:

   • If a pending DTC is output, the system is malfunctioning.
   • If a pending DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
11. Input the DTC: P0111.
12. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [E] and [F].
13. Drive the vehicle at 40 km/h (25 mph) or more for a total of 5 minutes or more [E].

    WARNING:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

14. Check the DTC judgment result again [F].

    HINT:

    If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [E] and [F] again.

15. If no pending DTC is output, perform a universal trip and check for permanent DTCs, refer to DTC CHECK / CLEAR .

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0111)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG).
   3. Turn the tester on.
   4. Select the following menu items: Powertrain / Engine and ECT / Trouble Code.
   5. Read the DTCs.

      Result

      Display (DTC Output)	Proceed to
      P0111 and other DTCs	A
      P0111	B

      HINT:

      If any DTCs other than P0111 are output, troubleshoot those DTCs first.

   B --> See step 3

   A --> See step 2

2. GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART
3. REPLACE MASS AIR FLOW METER. Refer to COMPONENTS

DTC P0112: Intake Air Temperature Circuit Low Input; DTC P0113: Intake Air Temperature Circuit High Input

DESCRIPTION

The intake air temperature sensor, mounted on the mass air flow meter, monitors the intake air temperature. The intake air temperature sensor has a built-in thermistor with a resistance that varies according to the temperature of the intake air. When the intake air temperature is low, the resistance of the thermistor increases. When the temperature is high, the resistance drops. These variations in resistance are transmitted to the ECM as voltage changes (seeFig. 1).

The intake air temperature sensor is powered by a 5 V applied from the THA terminal of the ECM, via resistor R.

Resistor R and the intake air temperature sensor are connected in series. When the resistance value of the intake air temperature sensor changes, according to changes in the intake air temperature, the voltage at terminal THA also varies. Based on this signal, the ECM increases the fuel injection volume when the engine is cold to improve driveability.

Fig. 43: IAT Sensor Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

HINT:

When any of DTCs P0112 and P0113 are set, the ECM enters fail-safe mode. During fail-safe mode, the intake air temperature is estimated to be 20°C (68°F) by the ECM. Fail-safe mode continues until a pass condition is detected.

DTC No.	DTC Detection Condition	Trouble Area
P0112	Short in intake air temperature sensor circuit for 0.5 seconds (1 trip detection logic)	Short in intake air temperature sensor circuit Intake air temperature sensor (built into mass air flow meter) ECM
P0113	Open in intake air temperature sensor circuit for 0.5 seconds (1 trip detection logic)	Open in intake air temperature sensor circuit Intake air temperature sensor (built into mass air flow meter) ECM

HINT:

When any of these DTCs are set, check the IAT by selecting the following menu items: Powertrain / Engine and ECT / Data List / All Data / Intake Air.

Temperature Displayed	Malfunctions
-40°C (-40°F)	Open circuit
140°C (284°F)	Short circuit

MONITOR DESCRIPTION

The ECM monitors the sensor voltage and uses this value to calculate the intake air temperature. When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a malfunction in the intake air temperature sensor and sets a DTC.

Example:

• If the sensor voltage output is -40°C (-40°F) for 0.5 seconds or more, the ECM determines that there is an open in the intake air temperature sensor circuit, and sets DTC P0113. Conversely, if the voltage output is more than 140°C (284°F) for 0.5 seconds or more, the ECM determines that there is a short in the sensor circuit, and sets DTC P0112.
• If the malfunction is not repaired successfully, a DTC is set 0.5 seconds after the engine is next started.

MONITOR STRATEGY

Related DTCs	P0112: Intake air temperature sensor short (Low electrical voltage) P0113: Intake air temperature sensor open (High electrical voltage)
Required Sensors / Components (Main)	Intake air temperature sensor
Required sensors / Components (Related)	-
Frequency of Operation	Continuous
Duration	0.5 seconds
MIL Operation	Immediate
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever these DTCs are not present	None
Battery voltage	8 V or more
Ignition switch	ON (IG)
Starter	OFF

TYPICAL MALFUNCTION THRESHOLDS

P0112:

Intake air temperature sensor voltage

Less than 0.18 V [More than 140°C (284°F)]

P0113:

Intake air temperature sensor voltage

More than 4.91 V [Less than -40°C (-40°F)]

COMPONENT OPERATING RANGE

Intake air temperature sensor voltage

0.18 V to 4.91 V [-40 to 140°C (-40 to 284°F)]

WIRING DIAGRAM

Fig. 44: Identifying IAT Sensor Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

CONFIRMATION DRIVING PATTERN

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn the Techstream on.
3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch on (IG) and turn the Techstream on.
6. Wait 0.5 seconds or more.
7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
8. Read the pending DTCs.

   HINT:

   • If a pending DTC is output, the system is malfunctioning.
   • If a pending DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
10. Input the DTC: P0112 or P0113.
11. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
12. If the judgment result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs, refer to DTC CHECK / CLEAR .

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

HINT:

• If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
• Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. READ VALUE USING TECHSTREAM (INTAKE AIR TEMPERATURE)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG).
   3. Turn the tester on.
   4. Select the following menu items: Powertrain / Engine and ECT / Data List / Intake Air.
   5. Read the value displayed on the tester.

      Standard

      Same as actual intake air temperature.

      Result

      Temperature Displayed	Proceed to
      -40°C (-40°F)	A
      140°C (284°F)	B
      Same as actual intake air temperature	C

      HINT:

      • If there is an open circuit, the Techstream indicates -40°C (-40°F).
      • If there is a short circuit, the Techstream indicates 140°C (284°F).

   B --> See step 4

   C --> See step 7

   A: Go to next step

2. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS)
   1. Disconnect the mass air flow meter connector.

      Fig. 45: Identifying Mass Air Flow Meter Connector
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Connect terminals THA and E2 of the mass air flow meter wire harness side connector.
   3. Connect the Techstream to the DLC3.
   4. Turn the ignition switch on (IG).
   5. Turn the tester on.
   6. Select the following menu items: Powertrain / Engine and ECT / Data List / Intake Air.
   7. Read the value displayed on the tester.

      Standard

      140°C (284°F)

      TEXT IN ILLUSTRATION
      

      *1	Mass Air Flow Meter
      *2	ECM
      *a	Front view of wire harness connector (to Mass Air Flow Meter)

   8. Reconnect the mass air flow meter connector.

   NG --> See step 3

   OK --> See step 8

3. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)
   1. Disconnect the mass air flow meter connector.
   2. Disconnect the ECM connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Check for open

      Check for short

      Tester Connection	Condition	Specified Condition
      B50-15 (THA) - B10-1 (THA)	Always	Below 1 ohms
      B50-7 (ETHA) - B10-2 (E2)	Always	Below 1 ohms

      Tester Connection	Condition	Specified Condition
      B50-15 (THA) or B10-1 (THA) - Body ground	Always	10 kohms or higher
      B50-7 (ETHA) or B10-2 (E2) - Body ground	Always	10 kohms or higher

   4. Reconnect the mass air flow meter connector.
   5. Reconnect the ECM connector.

   NG --> See step 9

   OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MASS AIR FLOW METER - ECM)

4. READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS)
   1. Disconnect the mass air flow meter connector.

      Fig. 46: Identifying Mass Air Flow Meter Connector
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Connect the Techstream to the DLC3.
   3. Turn the ignition switch on (IG).
   4. Turn the tester on.
   5. Select the following menu items: Powertrain / Engine and ECT / Data List / Intake Air.
   6. Read the value displayed on the tester.

      Standard

      -40°C (-40°F)

      TEXT IN ILLUSTRATION
      

      *1	Mass Air Flow Meter
      *2	ECM

   7. Reconnect the mass air flow meter connector.

   NG --> See step 5

   OK --> See step 10

5. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)
   1. Disconnect the mass air flow meter connector.
   2. Connect the Techstream to the DLC3.
   3. Turn the ignition switch on (IG).
   4. Turn the tester on.
   5. Select the following menu items: Powertrain / Engine and ECT / Data List / Intake Air.
   6. Read the value displayed on the tester.

      Standard

      -40°C (-40°F)

   7. Reconnect the mass air flow meter connector.

   NG --> See step 6

   OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MASS AIR FLOW METER - ECM)

6. REPLACE ECM. Refer to COMPONENTS
7. CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS
8. REPLACE MASS AIR FLOW METER. Refer to COMPONENTS
9. REPLACE ECM. Refer to COMPONENTS
10. REPLACE MASS AIR FLOW METER. Refer to COMPONENTS

DTC P0115: Engine Coolant Temperature Circuit; DTC P0117: Engine Coolant Temperature Circuit Low Input; DTC P0118: Engine Coolant Temperature Circuit High Input

DESCRIPTION

A thermistor is built into the engine coolant temperature sensor, of which the resistance value varies according to the engine coolant temperature.

The structure of the sensor and its connection to the ECM are the same as those of the intake air temperature sensor.

HINT:

When any of DTCs P0115, P0117 and P0118 are set, the ECM enters fail-safe mode. During fail-safe mode, the engine coolant temperature is estimated to be 80°C (176°F) by the ECM. Fail-safe mode continues until a pass condition is detected.

DTC No.	Proceed to	DTC Detection Condition	Trouble Area
P0115	Step 1	Open or short in engine coolant temperature sensor circuit for 0.5 seconds (1 trip detection logic)	Open or short in engine coolant temperature sensor circuit Engine coolant temperature sensor ECM
P0117	Step 4	Short in engine coolant temperature sensor circuit for 0.5 seconds (1 trip detection logic)	Short in engine coolant temperature sensor circuit Engine coolant temperature sensor ECM
P0118	Step 2	Open in engine coolant temperature sensor circuit for 0.5 seconds (1 trip detection logic)	Open in engine coolant temperature sensor circuit Engine coolant temperature sensor ECM

HINT:

When any of these DTCs are set, check the engine coolant temperature by selecting the following menu items: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.

Temperature Displayed	Malfunctions
-40°C (-40°F)	Open circuit
140°C (284°F)	Short circuit

MONITOR DESCRIPTION

The engine coolant temperature sensor is used to monitor the engine coolant temperature. The engine coolant temperature sensor has a thermistor with a resistance that varies according to the temperature of the engine coolant. When the coolant temperature becomes low, the resistance in the thermistor increases. When the temperature becomes high, the resistance drops.

These variations in resistance are reflected in the voltage output from the sensor. The ECM monitors the sensor voltage and uses this value to calculate the engine coolant temperature. When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a fault in the engine coolant temperature sensor and sets a DTC.

Example:

• If the sensor voltage output is -40°C (-40°F) for 0.5 seconds or more, the ECM determines that there is an open in the engine coolant temperature sensor circuit, and sets DTC P0118. Conversely, if the voltage output is more than 140°C (284°F) for 0.5 seconds or more, the ECM determines that there is a short in the sensor circuit, and sets DTC P0117.
• If the malfunction is not repaired successfully, a DTC is set 0.5 seconds after the engine is next started.

MONITOR STRATEGY

Related DTCs	P0115: Engine coolant temperature sensor open/short (Fluctuating) P0117: Engine coolant temperature sensor short (Low electrical voltage) P0118: Engine coolant temperature sensor open (High electrical voltage)
Required Sensors / Components (Main)	Engine coolant temperature sensor
Required Sensors / Components (Related)	-
Frequency of Operation	Continuous
Duration	0.5 seconds
MIL Operation	Immediate
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever these DTCs are not present

None

TYPICAL MALFUNCTION THRESHOLDS

P0115:

Engine coolant temperature sensor voltage

Less than 0.14 V or more than 4.91 V

P0117:

Engine coolant temperature sensor voltage

Less than 0.14 V [More than 140°C (284°F)]

P0118:

Engine coolant temperature sensor voltage

More than 4.91 V [Less than -40°C (-40°F)]

COMPONENT OPERATING RANGE

Engine coolant temperature sensor voltage

0.14 V to 4.91 V [-40 to 140°C (-40 to 284°F)]

WIRING DIAGRAM

Fig. 47: Identifying Engine Coolant Temperature Sensor Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

CONFIRMATION DRIVING PATTERN

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn the Techstream on.
3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch on (IG) and turn the Techstream on.
6. Wait 0.5 seconds or more.
7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
8. Read the pending DTCs.

   HINT:

   • If a pending DTC is output, the system is malfunctioning.
   • If a pending DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
10. Input the DTC: P0115, P0117 or P0118.
11. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
12. If the judgment result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs, refer to DTC CHECK / CLEAR .

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

HINT:

• If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
• Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. READ VALUE USING TECHSTREAM (ENGINE COOLANT TEMPERATURE)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG).
   3. Turn the tester on.
   4. Select the following menu items: Powertrain / Engine and ECT / Data List / Coolant Temp.
   5. Read the value displayed on the tester.

      Standard

      Between 75°C and 97°C (167°F and 207°F) with warm engine.

      Result

      Temperature Displayed	Proceed to
      -40°C (-40°F)	A
      140°C (284°F)	B
      Between 75°C and 97°C (167°F and 207°F)	C

      HINT:

      • If there is an open circuit, the Techstream indicates -40°C (-40°F).
      • If there is a short circuit, the Techstream indicates 140°C (284°F).

   B --> See step 4

   C --> See step 8

   A: Go to next step

2. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS)
   1. Disconnect the engine coolant temperature sensor connector.

      Fig. 48: Identifying Engine Coolant Temperature Sensor Connector
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Connect terminals 1 and 2 of the engine coolant temperature sensor connector on the wire harness side.
   3. Connect the Techstream to the DLC3.
   4. Turn the ignition switch on (IG).
   5. Turn the tester on.
   6. Select the following menu items: Powertrain / Engine and ECT / Data List / Coolant Temp.
   7. Read the value displayed on the tester.

      Standard

      140°C (284°F)

      TEXT IN ILLUSTRATION
      

      *1	Engine Coolant Temperature Sensor
      *2	ECM
      *a	Front view of wire harness connector (to Engine Coolant Temperature Sensor)

   8. Reconnect the engine coolant temperature sensor connector.

   NG --> See step 3

   OK --> See step 9

3. CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)
   1. Confirm and connection at the engine coolant temperature sensor.
   2. Disconnect the engine coolant temperature sensor connector.
   3. Connect terminals THW and ETHW of the ECM connector.

      HINT:

      Before checking, do visual and contact pressure checks on the ECM connector.

   4. Connect the Techstream to the DLC3.
   5. Turn the ignition switch on (IG).
   6. Turn the tester on.
   7. Select the following menu items: Powertrain / Engine and ECT / Data List / Coolant Temp.
   8. Read the value displayed on the tester.

      Standard

      140°C (284°F)

   9. Reconnect the engine coolant temperature sensor connector.

   NG --> See step 7

   OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)

4. READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS)
   1. Disconnect the engine coolant temperature sensor connector.

      Fig. 49: Identifying Engine Coolant Temperature Sensor Connector
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Connect the Techstream to the DLC3.
   3. Turn the ignition switch on (IG).
   4. Turn the tester on.
   5. Select the following menu items: Powertrain / Engine and ECT / Data List / Coolant Temp.
   6. Read the value displayed on the tester.

      Standard

      -40°C (-40°F)

      TEXT IN ILLUSTRATION
      

      *1	Engine Coolant Temperature Sensor
      *2	ECM

   7. Reconnect the engine coolant temperature sensor connector.

   NG --> See step 5

   OK --> See step 10

5. CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)
   1. Disconnect the engine coolant temperature sensor connector.
   2. Connect the Techstream to the DLC3.
   3. Turn the ignition switch on (IG).
   4. Turn the tester on.
   5. Select the following menu items: Powertrain / Engine and ECT / Data List / Coolant Temp.
   6. Read the value displayed on the tester.

      Standard

      -40°C (-40°F)

   7. Reconnect the engine coolant temperature sensor connector.

   NG --> See step 6

   OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)

6. REPLACE ECM. Refer to COMPONENTS
7. REPLACE ECM. Refer to COMPONENTS
8. CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS
9. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to COMPONENTS
10. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to COMPONENTS

DTC P0116: Engine Coolant Temperature Circuit Range / Performance Problem

DESCRIPTION

Refer to DTC P0115, refer to DESCRIPTION.

DTC No.	DTC Detection Condition	Trouble Area
P0116	When either of following conditions met (2 trip detection logic): When cold engine started and engine warmed up, Engine Coolant Temperature (ECT) sensor value does not change. After warmed up engine started, ECT sensor value does not change when engine stopped and then next cold engine start performed.	Thermostat Engine coolant temperature sensor
P0116	For Mexico Models: Case 1: Engine Coolant Temperature (ECT) between 35°C and 60°C (95°F and 140°F) when engine started, and conditions (a) and (b) met (2 trip detection logic) (a) Vehicle driven at varying speeds (accelerated and decelerated) (b) ECT remains within 3°C (37.4°F) of initial ECT Case 2: ECT more than 60°C (140°F) when engine started, and conditions (a) and (b) met (6 trip detection logic) (a) Vehicle driven at varying speeds (accelerated and decelerated) (b) ECT measurements remain within 1°C (33.8°F) of initial ECT on 6 successive occasions	Thermostat ECT sensor

MONITOR DESCRIPTION

Engine coolant temperature sensor cold start monitor

When a cold engine start is performed and then the engine is warmed up, if the engine coolant temperature sensor value does not change, it is determined that a malfunction has occurred. If this is detected in 2 consecutive driving cycles, the MIL is illuminated and a DTC is stored.

Engine coolant temperature sensor soak monitor

If the engine coolant temperature sensor value does not change after the warmed up engine is stopped and then the next cold engine start is performed, it is determined that a malfunction has occurred. If this is detected in 2 consecutive driving cycles, the MIL is illuminated and a DTC is stored.

ECT sensor high side stuck monitor (only for Mexico models)

The ECM monitors the sensor voltage and uses this value to calculate the ECT. If the sensor voltage output deviates from the normal operating range, the ECM interprets this deviation as a malfunction in the ECT sensor and sets the DTC.

Examples:

• Upon starting the engine, the ECT is between 35°C and 60°C (95°F and 140°F). If after driving for 250 seconds, the ECT remains within 3°C (37.4°F) of the starting temperature, the DTC is set (2 trip detection logic).
• Upon starting the engine, the ECT is over 60°C (140°F). If after driving for 250 seconds, the ECM remains within 1°C (33.8°F) of the starting temperature, the DTC is set (6 trip detection logic).

MONITOR STRATEGY

Related DTCs	P0116: Engine coolant temperature sensor rationality (Engine coolant temperature sensor cold start monitor) P0116: Engine coolant temperature sensor rationality (Engine coolant temperature sensor soak monitor)
Required Sensors / Components (Main)	Engine coolant temperature sensor
Required Sensors / Components (Related)	Crankshaft position sensor, intake air temperature sensor and mass air flow meter
Frequency of Operation	Continuous
Duration	5 hours
MIL Operation	2 driving cycles
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

ALL:

The monitor will run whenever these DTCs are not present.

None

ENGINE COOLANT TEMPERATURE SENSOR COLD START MONITOR:

Battery voltage	10.5 V or more
Time after engine start	1 second or more
Engine coolant temperature at engine start	Less than 60°C (140°F)
Engine coolant temperature sensor circuit (P0115, P0117, P0118, P0125)	OK
Intake air temperature sensor circuit (P0112, P0113)	OK
Soak time	0 second or more
Accumulated mass air flow	1643 g or more
Engine	Running
Fuel cut	OFF
Difference between engine coolant temperature at engine start and intake air temperature	Less than 40°C (104°F)

ENGINE COOLANT TEMPERATURE SENSOR SOAK MONITOR:

Battery voltage	10.5 V or more
Engine	Running
Soak time	5 hours or more
Engine coolant temperature at engine start	60°C (140°F) or more
Accumulated mass air flow	3047 g or more

TYPICAL MALFUNCTION THRESHOLDS

ENGINE COOLANT TEMPERATURE SENSOR COLD START MONITOR:

Engine coolant temperature sensor value change

Less than 5°C (41°F)

ENGINE COOLANT TEMPERATURE SENSOR SOAK MONITOR:

Engine coolant temperature sensor value change

Less than 5°C (41°F)

COMPONENT OPERATING RANGE

Engine coolant temperature

Varies with actual engine coolant temperature

CONFIRMATION DRIVING PATTERN

Fig. 50: Identifying Confirmation Driving Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn the Techstream on.
3. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
4. Check that the coolant temperature is 60°C (140°F) or less.
5. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
6. Turn the ignition switch off and wait for at least 30 seconds.
7. Turn the ignition switch on (IG) and turn the Techstream on [A].
8. Start the engine and idle it for 5 minutes or more [B].

   HINT:

   If the engine coolant temperature does not change by 5°C (9°F) or more, the engine coolant temperature sensor is malfunctioning. It is not necessary to continue this procedure.

9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
10. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P0116.
13. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [D] and [E].
14. Drive the vehicle at 40 km/h (25 mph) or more for a total of 5 minutes or more [D].

    WARNING:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

    HINT:

    In the event of the driving pattern being interrupted (possibly due to factors such as traffic conditions), the driving pattern can be resumed.

15. Check the DTC judgment result again [E].

    HINT:

    If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [D] and [E] again.

16. If no pending DTC is output, perform a universal trip and check for permanent DTCs, refer to DTC CHECK / CLEAR .

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

HINT:

• If any of DTC P0115, P0117, P0118 or P0125 are set simultaneously with DTC P0116, the engine coolant temperature sensor may have an open or a short circuit. Troubleshoot those DTCs first.
• Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0166)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG).
   3. Turn the tester on.
   4. Select the following menu items: Powertrain / Engine and ECT / Trouble Code.
   5. Read the DTC.

      Result

      Display (DTC output)	Proceed to
      P0116	A
      P0116 and other DTCs	B

      HINT:

      If any DTCs other than P0116 are output, troubleshoot those DTCs first.

   B --> See step 3

   A: Go to next step

2. INSPECT THERMOSTAT
   1. Remove the thermostat, refer to REMOVAL .
   2. Check the valve opening temperature of the thermostat.

      Standard

      80 to 84°C (176 to 183°F)

      HINT:

      In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard.

   3. Reinstall the thermostat, refer to INSTALLATION .

   NG --> See step 4

   OK --> See step 5

3. GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART
4. REPLACE THERMOSTAT. Refer to COMPONENTS
5. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to COMPONENTS

DTC P011B: Engine Coolant Temperature / Intake Air Temperature Correlation

DESCRIPTION

The ECM calculates the difference between the readings of the coolant temperature sensor and intake air temperature sensor. If the difference is greater than 20°C (36°F), the ECM will judge this as a malfunction and will set this DTC.

DTC No.	DTC Detection Condition	Trouble Area
P011B	When conditions (a), (b), (c), (d) and (e) are met (2 trip detection) (a) Battery voltage is 10.5 V or more (b) 15 seconds after the engine has been started after the ignition switch has been off for more than 7 hours (c) The minimum intake air temperature after the engine has been started is more than -10°C (14°F) (d) The average coolant temperature before the engine is started is more than -10°C (14°F) (e) The difference between the readings of the ECT and IAT is greater than 20°C (36°F)	IAT sensor ECT sensor ECM

Fig. 51: Identifying IAT Sensor Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

HINT:

• Waiting is required to prevent the temperature of the engine from affecting the readings. If the engine has been operated recently, it will not be possible to accurately compare the readings.
• For diagnosis, in order to duplicate the detection conditions of the DTC, it is necessary to park the vehicle for 7 hours. Parking the vehicle for 7 hours ensures that the actual temperature of the ECT and IAT are very similar. When the vehicle has been parked for less than 7 hours, differences in the readings may exist, this does not necessarily indicate a fault.

MONITOR DESCRIPTION

The ECM monitors the difference between the Engine Coolant Temperature (ECT) and the Intake Air Temperature (IAT) when the engine is started cold to detect the engine temperature accurately. The monitor runs when the engine started cold after 7 hours or more have elapsed since the engine was stopped (ignition switch turned off) on the previous trip. If the difference between the ECT and the IAT on a cold start exceeds 20°C (36°F), the ECM interprets this as a malfunction in the ECT sensor circuit and IAT sensor circuit, and sets the DTC.

MONITOR STRATEGY

Related DTCs	P011B: ECT / IAT sensor correlation
Required Sensors / Components (Main)	ECT / IAT sensor
Required Sensors / Components (Related)	-
Frequency of Operation	Once per driving cycle
Duration	7 hours or more
MIL Operation	2 driving cycles
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever these DTCs are not present	None
All of following conditions are met	Conditions 1 and 2
1. All of following conditions are met	Conditions (a), (b), (c) and (d)
(a) After ignition switch ON and engine not running time	Less than 20 seconds
(b) Soak Time	7 hours or more
(c) Battery voltage	10.5 V or more
(d) Time after engine start	15 seconds or more
2. Either of the following conditions is met	Conditions (a) and (b)
(a) After engine start minimum IAT	-10°C (14°F) or more
(b) Before engine start ECT	-10°C (14°F) or more
Engine coolant temperature sensor circuit fail (P115, P0117, P0118, P0125)	OK
Intake air temperature sensor circuit fail (P0112, P0113)	OK
Soak timer circuit fail	OK

TYPICAL MALFUNCTION THRESHOLDS

Deviated ECT minus Deviated IAT

Less than -20°C (-36°F) or more than 20°C (36°F)

CONFIRMATION DRIVING PATTERN

Fig. 52: Identifying Confirmation Driving Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn the Techstream on.
3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation) [A].
4. Turn the ignition switch off.
5. With the engine stopped, leave the vehicle as is for 7.5 hours or more [B].
6. Start the engine and wait 60 seconds or more [C].
7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].
8. Read the pending DTCs.

   HINT:

   • If a pending DTC is output, the system is malfunctioning.
   • If a pending DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
10. Input the DTC: P011B.
11. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [A] through [D] again.
12. If no pending DTC is output, perform a universal trip and check for permanent DTCs, refer to DTC CHECK / CLEAR .

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION P011B)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG).
   3. Turn the tester on.
   4. Enter the following menus: Powertrain / Engine and ECT / Trouble Code.
   5. Read the DTCs.

      Result

      Display (DTC Output)	Proceed to
      P011B	A
      P011B and other DTCs	B

      HINT:

      If any DTCs other than P011B are output, troubleshoot those DTCs first.

   B --> See step 4

   A: Go to next step

2. READ VALUE USING TECHSTREAM (INTAKE AIR TEMPERATURE)
   1. Leave the vehicle for 7 hours or more.

      HINT:

      It is necessary to leave the vehicle for 7 hours or more to allow conditions similar to the DTC detection conditions.

   2. Connect the Techstream to the DLC3.
   3. Turn the ignition switch on (IG).
   4. Turn the tester ON.
   5. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Intake Air.
   6. Read the value displayed on the tester.

      OK

      The intake air temperature and the outside air temperature are within 10°C (50°F) of each other.

      HINT:

      Temperature readings on the vehicle's outside temperature gauge (if equipped) are not suitable for comparing to the IAT reading. The outside temperature gauge has a significant delay built in to prevent temperature swings from being displayed on its display. Use an accurate thermometer to determine the outside air temperature.

   NG --> See step 5

   OK: Go to next step

3. READ VALUE USING TECHSTREAM (COOLANT TEMPERATURE)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG).
   3. Turn the tester ON.
   4. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.

      OK

      The coolant temperature and the outside air temperature are within 10°C (50°F) of each other.

      HINT:

      If the result is not as specified, check if there are heat sources such as a block heater in the engine compartment.

   NG --> See step 7

   OK --> See step 6

4. GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART
5. REPLACE MASS AIR FLOW METER. Refer to REMOVAL
6. REPLACE ECM. Refer to COMPONENTS
7. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to REMOVAL

DTC P0120: Throttle / Pedal Position Sensor / Switch "A" Circuit; DTC P0121: Throttle / Pedal Position Sensor / Switch "A" Circuit Range / Performance Problem; DTC P0122: Throttle / Pedal Position Sensor / Switch "A" Circuit Low Input; DTC P0123: Throttle / Pedal Position Sensor / Switch "A" Circuit High Input; DTC P0220: Throttle / Pedal Position Sensor / Switch "B" Circuit; DTC P0222: Throttle / Pedal Position Sensor / Switch "B" Circuit Low Input; DTC P0223: Throttle / Pedal Position Sensor / Switch "B" Circuit High Input; DTC P2135: Throttle / Pedal Position Sensor / Switch "A" / "B" Voltage Correlation

DESCRIPTION

HINT:

This electrical throttle control system does not use a throttle cable.

The throttle position sensor is mounted on the throttle body, and detects the opening angle of the throttle valve. This sensor is a non-contact type, and uses Hall-effect elements, in order to yield accurate signals, even in extreme driving conditions, such as at high speeds as well as very low speeds.

The throttle position sensor has two sensor circuits which each transmits a signal, VTA1 and VTA2. VTA1 is used to detect the throttle valve angle and VTA2 is used to detect malfunctions in VTA1. The sensor signal voltages vary between 0 V and 5 V in proportion to the throttle valve opening angle, and are transmitted to the VTA terminals of the ECM.

As the valve closes, the sensor output voltage decreases and as the valve opens, the sensor output voltage increases. The ECM calculates the throttle valve opening angle according to these signals and controls the throttle actuator in response to driver inputs. These signals are also used in calculations such as air fuel ratio correction, power increase correction and fuel-cut control.

Fig. 53: Identifying Throttle Position Sensor & Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DTC No.	DTC Detection Condition	Trouble Area
P0120	Output voltage of VTA1 quickly fluctuates beyond lower and upper malfunction thresholds for 2 seconds (1 trip detection logic)	Throttle position sensor (built into throttle body) ECM
P0121	Difference between VTA1 and VTA2 voltages less than 0.8 V, or more than 1.6 V for 2 seconds (1 trip detection logic)	Throttle position sensor (built into throttle body)
P0122	Output voltage of VTA1 is 0.2 V or less for 2 seconds (1 trip detection logic)	Throttle position sensor (built into throttle body) Short in VTA1 circuit Open in VC circuit ECM
P0123	Output voltage of VTA1 is 4.535 V or more for 2 seconds (1 trip detection logic)	Throttle position sensor (built into throttle body) Open in VTA1 circuit Open in E2 circuit Short between VC and VTA1 circuits ECM
P0220	Output voltage of VTA2 quickly fluctuates beyond lower and upper malfunction thresholds for 2 seconds (1 trip detection logic)	Throttle position sensor (built into throttle body) ECM
P0222	Output voltage of VTA2 is 1.75 V or less for 2 seconds (1 trip detection logic)	Throttle position sensor (built into throttle body) Short in VTA2 circuit Open in VC circuit ECM
P0223	Output voltage of VTA2 is 4.8 V or more, and VTA1 is between 0.2 V and 2.02 V, for 2 seconds (1 trip detection logic)	Throttle position sensor (built into throttle body) Open in VTA2 circuit Open in E2 circuit Short between VC and VTA2 circuits ECM
P2135	Either condition (a) or (b) is met (1 trip detection logic): (a) Difference between output voltages of VTA1 and VTA2 is 0.02 V or less for 0.5 seconds or more (b) Output voltage of VTA1 is 0.2 V or less, and VTA2 is 1.75 V or less, for 0.4 seconds or more	Short between VTA1 and VTA2 circuits Throttle position sensor (built into throttle body) ECM

HINT:

• When any of these DTCs are set, check the throttle valve opening angle by selecting the following menu items on the Techstream: Powertrain / Engine and ECT / Data List / ETCS / Throttle Sensor Position No. 1 and Throttle Sensor Position No. 2.
• Throttle Sensor Position No. 1 denotes the VTA1 signal (expressed in percentages), and Throttle Sensor Position No. 2 denotes the VTA2 signal (expressed in voltages).

REFERENCE (NORMAL CONDITION)

Tester Display	Accelerator Pedal Fully Released	Accelerator Pedal Fully Depressed
Throttle Sensor Position No. 1	0.5 to 1.1 V	3.3 to 4.9 V
Throttle Sensor Position No. 2	2.1 to 3.1 V	4.5 to 5.0 V

MONITOR DESCRIPTION

P0120, P0122, P0123, P0220, P0222, P0223, P2135

The ECM uses the throttle position sensor to monitor the throttle valve opening angle. There are several checks that the ECM performs to confirm the proper operation of the throttle position sensor.

• A specific voltage difference is expected between the sensor terminals, VTA1 and VTA2, for each throttle valve opening angle. If the difference between VTA1 and VTA2 is incorrect, the ECM interprets this as a malfunction in the sensor, and sets a DTC.
• VTA1 and VTA2 each have a specific voltage range. If VTA1 or VTA2 is outside the normal operating range, the ECM interprets this as a malfunction in the sensor, and sets a DTC.
• VTA1 and VTA2 should never be close to the same voltage level. If VTA1 is within 0.02 V of VTA2, the ECM determines that there is a short circuit in the sensor, and sets a DTC.

If the malfunction is not repaired successfully, a DTC is set 2 seconds after the engine is next started.

P0121

This sensor transmits two signals: VTA1 and VTA2. VTA1 is used to detect the throttle opening angle and VTA2 is used to detect malfunctions in VTA1. The ECM performs several checks to confirm the proper operation of the throttle position sensor and VTA1.

For each throttle opening angle, a specific voltage difference is expected between the outputs of VTA1 and VTA2. If the voltage output difference between the two signals deviates from the normal operating range, the ECM interprets this as a malfunction of the throttle position sensor. The ECM illuminates the MIL and sets the DTC.

If the malfunction is not repaired successfully, the DTC is set 2 seconds after the engine is next started.

MONITOR STRATEGY

Related DTCs	P0120: Throttle position sensor 1 range check (Fluctuating) P0121: Throttle position sensor rationality P0122: Throttle position sensor 1 range check (Low voltage) P0123: Throttle position sensor 1 range check (High voltage) P0220: Throttle position sensor 2 range check (Fluctuating) P0222: Throttle position sensor 2 range check (Low voltage) P0223: Throttle position sensor 2 range check (High voltage) P2135: Throttle position sensor range check (Correlation)
Required Sensors / Components (Main)	Throttle position sensor
Required Sensors / Components (Related)	-
Frequency of Operation	Continuous
Duration	2 seconds: P0120, P0122, P0123, P0220, P0222 and P0223 (Accelerator pedal ON) Within 2 seconds: P0121 0.5 seconds: P2135 (Condition A) 0.4 seconds: P2135 (Condition B)
MIL Operation	Immediate
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

P0120, P0122, P0123, P0220, P0222, P0223, P2135

The monitor will run whenever these DTCs are not present	None
Either of following conditions A or B met	-
A. Ignition switch on (IG)	0.012 seconds or more
B. Electronic throttle actuator power	ON

P0121

This monitor will not run whenever these DTCs are not present	None
Either of the following conditions is met:	Condition 1 or 2
1. Ignition switch	ON (IG)
2. Electric throttle motor power	ON
Throttle position sensor malfunction (P0120, P0122, P0123, P0220, P0222, P0223, P2135)	Not detected

TYPICAL MALFUNCTION THRESHOLDS

P0120:

VTA1 voltage

0.2 V or less, or 4.535 V or more

P0121:

Difference of throttle position sensor voltage between VTA1 and VTA2 x 0.8	More than 1.6 V
Difference of throttle position sensor voltage between VTA1 and VTA2 x 0.8	Less than 0.8 V

P0122:

VTA1 voltage

0.2 V or less

P0123:

VTA1 voltage

4.535 V or more

P0220:

VTA2 voltage

1.75 V or less, or 4.8 V or more

P0222:

VTA2 voltage

1.75 V or less

P0223:

VTA2 voltage when VTA1 0.2 V to 2.02 V

4.8 V or more

P2135:

Either of following conditions A or B is met:	-
Condition A	-
Difference between VTA1 and VTA2 voltages	0.02 V or less
Condition B	-
Both of the following conditions are met	(a) or (b)
(a) VTA1 voltage	0.2 V or less
(b) VTA2 voltage	1.75 V or less

COMPONENT OPERATING RANGE

VTA1 voltage	0.2 to 4.535 V
VTA2 voltage	1.75 to 4.8 V

FAIL-SAFE

When any of these DTCs, as well as other DTCs relating to electronic throttle control system malfunctions, are set, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator off, and the throttle valve is returned to a 6° throttle angle by the return spring. The ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition timing, in accordance with the accelerator pedal opening angle, to allow the vehicle to continue at a minimal speed. If the accelerator pedal is depressed slowly, the vehicle can be driven slowly.

Fail-safe mode continues until a pass condition is detected, and the ignition switch is turned off.

WIRING DIAGRAM

Fig. 54: Identifying Throttle Control Motor/Throttle Position Sensor Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

CONFIRMATION DRIVING PATTERN

Fig. 55: Identifying Confirmation Driving Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn the Techstream on.
3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch on (IG) and turn the Techstream on [A].
6. Start the engine.
7. With the vehicle stationary, fully depress and release the accelerator pedal [B].
8. Idle the engine for 2 seconds or more [C].
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].
10. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P0120, P0121, P0122, P0123, P0220, P0222, P0223 or P2135.
13. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [B] through [D] again.
14. If no pending DTC is output, perform a universal trip and check for permanent DTCs, refer to DTC CHECK / CLEAR .

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

HINT:

• If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
• Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. READ VALUE USING TECHSTREAM (THROTTLE POS AND THROTTLE POS #2)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG) and turn the tester on.
   3. Select the following menu items: Powertrain / Engine and ECT / Data List / Throttle Position No. 1 and Throttle Sensor Position No. 2.
   4. Check the values displayed on the tester.

      Result

      When accelerator pedal released		When accelerator pedal depressed		Trouble Area	Proceed to
      Throttle Sensor Position No. 1	Throttle Sensor Position No. 2	Throttle Sensor Position No. 1	Throttle Sensor Position No. 2
      0 to 0.2 V	Between 0 V and 0.2 V	0 to 0.2 V	Between 0 V and 0.2 V	VC circuit open	A
      4.5 to 5.0 V	Between 4.5 V and 5.0 V	4.5 to 5.0 V	Between 4.5 V and 5.0 V	E2 circuit open	A
      0 to 0.2 V or 4.5 to 5.0 V	2.1 to 3.1 V (Fail-safe)	0 to 0.2 V or 4.5 to 5.0 V	2.1 to 3.1 V (Fail-safe)	VTA1 circuit open or ground short	A
      0.6 to 1.4 V (Fail-safe)	Between 0 V and 0.2 V, or 4.5 V and 5.0 V	0.6 to 1.4 V (Fail-safe)	Between 0 V and 0.2 V, or 4.5 V and 5.0 V	VTA2 circuit open or ground short	A
      0.5 to 1.1 V	Between 2.1 V and 3.1 V	3.2 to 4.8 V (Not fail-safe)	Between 4.6 V and 5.0 V (Not fail-safe)	Throttle position sensor circuit normal	B

      HINT:

      • DTC P0121 is stored when the voltages output from VTA1 and VTA2 are not consistent with the characteristics of the sensors. Therefore, check the Freeze Frame Data when this DTC is output. Use the following formula to confirm relative fluctuations in voltage.

        Features of sensor output

        VTA2 x 0.8 is approximately equal to VTA1 + 1.11 V

        VTA1: Throttle Position No. 1

        VTA2: Throttle position No. 2

      • If DTC P0121 is output, proceed to the "CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)".

   B --> See step 5

   A: Go to next step

2. CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)
   1. Disconnect the throttle body connector.
   2. Disconnect the ECM connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Check for open

      Check for short

      Tester Connection	Condition	Specified Condition
      B27-5 (VC) - B49-13 (VCTA)	Always	Below 1 ohms
      B27-6 (VTA) - B49-15 (VTA1)	Always	Below 1 ohms
      B27-4 (VTA2) - B49-16 (VTA2)	Always	Below 1 ohms
      B27-3 (E2) - B49-14 (ETA)	Always	Below 1 ohms

      Tester Connection	Condition	Specified Condition
      B27-5 (VC) or B49-13 (VCTA) - Body ground	Always	10 kohms or higher
      B27-6 (VTA) or B49-15 (VTA1) - Body ground	Always	10 kohms or higher
      B27-4 (VTA2) or B49-16 (VTA2) - Body ground	Always	10 kohms or higher

   4. Reconnect the throttle body connector.
   5. Reconnect the ECM connector.

   NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (THROTTLE POSITION SENSOR - ECM)

   OK: Go to next step

3. INSPECT ECM (VC VOLTAGE)
   1. Turn the ignition switch on (IG).
   2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection	Switch Condition	Specified Condition
      B49-13 (VCTA) - B49-14 (ETA)	Ignition switch on (IG)	4.5 to 5.0 V

   NG --> See step 6

   OK: Go to next step

4. REPLACE THROTTLE BODY
   1. Replace the throttle body, refer to COMPONENTS .

   NEXT: Go to next step

5. CHECK WHETHER DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG) and turn the tester on.
   3. Clear the DTCs, refer to DTC CHECK / CLEAR .
   4. Start the engine.
   5. With the vehicle stationary, fully depress and release the accelerator pedal.
   6. Allow the engine to idle for 2 seconds or more.
   7. Select the following menu items: Powertrain / Engine and ECT / Trouble Code.
   8. Read the DTCs.

      Result

      Display (DTC Output)	Proceed to
      P0120, P0121, P0122, P0123, P0220, P0222, P0223 and/or P2135	A
      No output	B

   B --> END

   A --> See step 6

6. REPLACE ECM. Refer to COMPONENTS

DTC P0125: Insufficient Coolant Temperature for Closed Loop Fuel Control

DESCRIPTION

Refer to DTC P0115, refer to DESCRIPTION.

DTC No.	DTC Detection Condition	Trouble Area
P0125	Engine coolant temperature does not reach closed-loop enabling temperature for 20 minutes (this period varies with engine start engine coolant temperature)	Cooling system Engine coolant temperature sensor Thermostat

MONITOR DESCRIPTION

The resistance of the engine coolant temperature sensor varies in proportion to the actual engine coolant temperature. The ECM supplies a constant voltage to the sensor and monitors the signal output voltage of the sensor. The signal voltage output varies according to the changing resistance of the sensor. After the engine is started, the engine coolant temperature is monitored through this signal. If the engine coolant temperature sensor indicates that the engine is not yet warm enough for closed-loop fuel control, despite a specified period of time having elapsed since the engine was started, the ECM interprets this as a malfunction in the sensor or cooling system and sets the DTC.

MONITOR STRATEGY

Related DTCs	P0125: Insufficient engine coolant temperature for closed-loop fuel control
Required Sensors / Components (Main)	Thermostat, cooling system
Required Sensors / Components (Related)	Engine coolant temperature sensor and mass air flow meter
Frequency of Operation	Continuous
Duration	55 seconds: Engine coolant temperature at engine start is (closed-loop engine coolant temperature -8.33°C (47.0°F) or more 93 seconds: Engine coolant temperature at engine start is (closed-loop engine coolant temperature -19.44 (67.0°F) to (closed-loop engine coolant temperature -8.33°C (47.0°F) 20 minutes: Engine coolant temperature at engine start less than (closed-loop engine coolant temperature -19.44 (67.0°F)
MIL Operation	2 driving cycles
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever these DTCs are not present	None
Thermostat (P0128)	OK
Mass air flow meter (P0101, P0102, P0103)	OK
Intake air temperature sensor (P0112, P0113)	OK
Engine coolant temperature sensor (P0115, P0117, P0118)	OK

TYPICAL MALFUNCTION THRESHOLDS

Time until actual engine coolant temperature reaches closed-loop fuel control enabling temperature

55 seconds: Engine coolant temperature at engine start is (closed-loop engine coolant temperature -8.33°C (47.0°F) or more 93 seconds: Engine coolant temperature at engine start is (closed-loop engine coolant temperature -19.44 (67.0°F) to (closed-loop engine coolant temperature -8.33°C (47.0°F) 20 minutes: Engine coolant temperature at engine start less than (closed-loop engine coolant temperature -19.44 (67.0°F)

WIRING DIAGRAM

Refer to DTC P0115, refer to WIRING DIAGRAM.

CONFIRMATION DRIVING PATTERN

1. Leave the vehicle outside overnight.
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch on (IG) and turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
5. Check that the engine coolant temperature is 10°C (50°F) or less.
6. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
7. Turn the ignition switch off and wait for at least 30 seconds.
8. Turn the ignition switch on (IG) and turn the Techstream on.
9. Start the engine.
10. Wait 21 minutes or more.
11. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
12. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
13. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
14. Input the DTC: P0125.
15. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
16. If the judgment result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs, refer to DTC CHECK / CLEAR .

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

HINT:

• If any of DTCs P0115, P0116, P0117 or P0118 are set simultaneously with DTC P0125, the engine coolant temperature sensor may have an open or a short circuit. Troubleshoot those DTCs first.
• Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0125)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG).
   3. Turn the tester on.
   4. Select the following menu items: Powertrain / Engine and ECT / Trouble Code.
   5. Read the DTCs.

      Result

      Display (DTC Output)	Proceed to
      P0125	A
      P0125 and other DTCs	B

      HINT:

      If any DTCs other than P0125 are output, troubleshoot those DTCs first.

   B --> See step 5

   A: Go to next step

2. INSPECT THERMOSTAT
   1. Remove the thermostat, refer to REMOVAL .
   2. Check the valve opening temperature of the thermostat.

      Standard

      80 to 84°C (176 to 183°F)

      HINT:

      In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard.

   3. Reinstall the thermostat, refer to INSTALLATION .

   NG --> See step 6

   OK: Go to next step

3. CHECK COOLING SYSTEM
   1. Check for defects in the cooling system that might cause the system to be too cold, such as abnormal radiator fan operation or any modifications.

   NG --> REPAIR OR REPLACE COOLING SYSTEM

   OK --> See step 4

4. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to COMPONENTS
5. GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART
6. REPLACE THERMOSTAT. Refer to COMPONENTS

DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

CAUTION / NOTICE / HINT

HINT:

This DTC relates to the thermostat.

DESCRIPTION

This DTC is set when the engine coolant temperature does not reach 75°C (167°F) despite sufficient engine warm-up time.

DTC No.	DTC Detection Condition	Trouble Area
P0128	Conditions (a), (b) and (c) are met for 5 seconds (2 trip detection logic): (a) Cold start (b) Engine warmed up (c) Engine coolant temperature less than 75°C (167°F)	Thermostat Cooling system Engine coolant temperature sensor ECM

MONITOR DESCRIPTION

Fig. 56: Identifying Engine Coolant Temperature Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

The ECM estimates the engine coolant temperature based on the starting temperature, engine loads, and engine speeds. The ECM then compares the estimated temperature with the actual engine coolant temperature. When the estimated engine coolant temperature reaches 75°C (167°F), the ECM checks the actual engine coolant temperature. If the actual engine coolant temperature is less than 75°C (167°F), the ECM interprets this as a malfunction in the thermostat or the engine cooling system and sets the DTC.

MONITOR STRATEGY

Related DTCs	P0128: Coolant Thermostat
Required Sensors / Components (Main)	Thermostat
Required Sensors / Components (Related)	Engine coolant temperature sensor, intake air temperature sensor, Vehicle speed sensor
Frequency of Operation	Once per driving cycle
Duration	480 seconds
MIL Operation	2 driving cycles
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever these DTCs are not present	P0010, P0020 (OCV bank 1, 2) P0011, P0021 (VVT system bank 1, 2 - advance) P0012, P0022 (VVT system bank 1, 2 - retard) P0013, P0023 (Exhaust OCV bank 1, 2) P0014, P0024 (Exhaust VVT system bank 1, 2 - advance) P0015, P0025 (Exhaust VVT system bank 1, 2 - retard) P0016, P0018 (VVT system bank 1, 2 - misalignment) P0017, P0019 (Exhaust VVT system bank 1, 2 - misalignment) P0031, P0032, P0051, P0052 (A/F sensor heater) P0102, P0103 (MAF meter) P0112, P0113 (IAT sensor) P0115, P0117, P0118 (ECT sensor) P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (TP sensor) P014C, P014D, P014E, P014F (A/F sensor - slow response) P015A, P015B, P015C, P015D (A/F sensor - delayed response) P0301, P0302, P0303, P0304, P0305, P0306 (Misfire) P0335 (CKP sensor) P0340, P0342, P0343, P0345, P0347, P0348 (VVT sensor) P0351, P0352, P0353, P0354, P0355, P0356 (Igniter) P0365, P0367, P0368, P0390, P0392, P0393 (Exhaust VVT sensor) P0500 (Vehicle speed sensor) P2195, P2196, P2197, P2198 (A/F sensor - rationality) P2237, P2240 (A/F sensor - open) P2238, P2241, P2252, P2255 (A/F sensor - low impedance) P2239, P2242, P2253, P2256 (A/F sensor - high impedance)
Battery voltage	11 V or more
Either of following conditions is met:	Condition 1 or 2
1. All of following conditions are met:	Conditions (a), (b) and (c)
(a) Engine coolant temperature at engine start - Intake air temperature at engine start	-15 to 7°C (5 to 45°F)
(b) Engine coolant temperature at engine start	-10 to 56°C (14 to 133°F)
(c) Intake air temperature at engine start	-10 to 56°C (14 to 133°F)
2. All of following conditions are met:	Conditions (d), (e) and (f)
(d) Engine coolant temperature at engine start - Intake air temperature at engine start	More than 7°C (45°F)
(e) Engine coolant temperature at engine start	56°C (133°F) or less
(f) Intake air temperature at engine start	-10°C (14°F) or more
Accumulated time that vehicle speed is 80 mph (128 km/h) or more	Less than 20 seconds

TYPICAL MALFUNCTION THRESHOLDS

Duration that all of the following conditions 1 and 2 are met	5 seconds or more
1. Estimated engine coolant temperature	75°C (167°F) or more
2. Engine coolant temperature sensor output	Less than 75°C (167°F)

CONFIRMATION DRIVING PATTERN

Fig. 57: Identifying Confirmation Driving Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Stop the engine and allow it to soak.
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch on (IG) and turn the Techstream on [A].
4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp and Intake Air.
5. Check that "Coolant Temp" is 56°C (133°F) or less and "Intake Air" is between 0 and 35°C (0 and 95°F).
6. Set the heater to MAX HOT with fresh air mode selected and turn the A/C off.
7. Start the engine and drive the vehicle at 80 km/h (50 mph) for 15 minutes [B].

   HINT:

   • Data can be captured relatively easily by using the snapshot function in the Data List.
   • Enter the following menus: Data List / Function / Snap-shot configuration / Record time / 5 min.
   • Data capture can be started by using the target point function. For example, setting the target point to an engine speed of 4000 RPM and then racing the engine, etc. to raise the engine speed to a speed of 4000 RPM or more will cause data capture to start.
8. After "Coolant Temp" stabilizes, check that "Coolant Temp" is 75°C (167°F) or higher [C].

   HINT:

   If "Coolant Temp" is below 75°C (167°F) while driving the vehicle at 80 km/h (50 mph), inspect the cooling system and thermostat.

INSPECTION PROCEDURE

HINT:

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0128)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG).
   3. Turn the tester on.
   4. Select the following menu items: Powertrain / Engine and ECT / Trouble Code.
   5. Read the DTCs.

      Result

      Display (DTC Output)	Proceed to
      P0128	A
      P0128 and other DTCs	B

      HINT:

      If any DTCs other than P0128 are output, troubleshoot those DTCs first.

   B --> See step 5

   A: Go to next step

2. CHECK COOLING SYSTEM
   1. Check for defects in the cooling system that might cause the system to be too cold, such as abnormal radiator fan operation or any modifications.

   NG --> REPAIR OR REPLACE COOLING SYSTEM

   OK: Go to next step

3. INSPECT THERMOSTAT
   1. Remove the thermostat, refer to REMOVAL .
   2. Check the valve opening temperature of the thermostat.

      Standard

      80 to 84°C (176 to 183°F)

      HINT:

      In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard.

   3. Reinstall the thermostat, refer to INSTALLATION .

   NG --> See step 6

   OK --> See step 4

4. REPLACE ECM. Refer to COMPONENTS
5. GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART
6. REPLACE THERMOSTAT. Refer to COMPONENTS

DTC P0136: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2); DTC P0137: Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 2); DTC P0138: Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 2); DTC P0139: Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 2); DTC P0156: Oxygen Sensor Circuit Malfunction (Bank 2 Sensor 2); DTC P0157: Oxygen Sensor Circuit Low Voltage (Bank 2 Sensor 2); DTC P0158: Oxygen Sensor Circuit High Voltage (Bank 2 Sensor 2); DTC P0159: Oxygen Sensor Circuit Slow Response (Bank 2 Sensor 2)

DESCRIPTION

HINT:

Sensor 2 refers to the sensor mounted behind the three-way catalytic converter and located far from the engine assembly.

In order to obtain a high purification rate of the carbon monoxide (CO), hydrocarbon and nitrogen oxide (NOx) components in the exhaust gas, a three-way catalytic converter is used. For the most efficient use of the three-way catalytic converter, the air fuel ratio must be precisely controlled so that it is always close to the stoichiometric air fuel level. For the purpose of helping the ECM to deliver accurate air fuel ratio control, a heated oxygen sensor is used.

The heated oxygen sensor is located behind the three-way catalytic converter, and detects the oxygen concentration in the exhaust gas. Since the sensor is integrated with the heater that heats the sensing portion, it is possible to detect the oxygen concentration even when the intake air volume is low (the exhaust gas temperature is low).

When the air fuel ratio becomes lean, the oxygen concentration in the exhaust gas is rich. The heated oxygen sensor informs the ECM that the post-three-way catalytic converter air fuel ratio is lean (low voltage, i.e. less than 0.45 V).

Conversely, when the air fuel ratio is richer than the stoichiometric air fuel level, the oxygen concentration in the exhaust gas becomes lean. The heated oxygen sensor informs the ECM that the post-three-way catalytic converter air fuel ratio is rich (high voltage, i.e. more than 0.45 V). The heated oxygen sensor has the property of changing its output voltage drastically when the air fuel ratio is close to the stoichiometric level.

The ECM uses the supplementary information from the heated oxygen sensor to determine whether the air fuel ratio after the three-way catalytic converter is rich or lean, and adjusts the fuel injection time accordingly. Thus, if the heated oxygen sensor is working improperly due to internal malfunctions, the ECM is unable to compensate for deviations in the primary air fuel ratio control.

Fig. 58: Heated Oxygen Sensor Output Voltage Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DTC No.	DTC Detection Condition	Trouble Area
P0136 P0156	Abnormal voltage output: During active air-fuel ratio control, HO2 sensor voltage does not increase to more than 0.59 V for certain period of time (2 trip detection logic) Low impedance: Sensor impedance less than 5 ohms for more than 30 seconds when ECM presumes sensor is warmed up and operating normally (2 trip detection logic)	Open or short in heated oxygen sensor (bank1, 2 sensor 2) circuit Heated oxygen sensor (bank1, 2 sensor 2) Heated oxygen sensor heater (bank1, 2 sensor 2) Air fuel ratio sensor (bank1, 2 sensor 1) Gas leak from exhaust system
P0137 P0157	Low voltage (open): During active air-fuel ratio control, following conditions (a) and (b) met for certain period of time (2 trip detection logic) (a) Heated Oxygen (HO2) sensor voltage output less than 0.21 V (b) Target air-fuel ratio rich High impedance: Sensor impedance 15 kohms or more for more than 90 seconds when ECM presumes sensor to be warmed up and operating normally (2 trip detection logic)	Open or short in heated oxygen sensor (bank1, 2 sensor 2) circuit Heated oxygen sensor (bank1, 2 sensor 2) Heated oxygen sensor heater (bank1, 2 sensor 2) Air fuel ratio sensor (bank1, 2 sensor 1) Gas leak from exhaust system
P0138 P0158	Extremely high voltage (short): Heated oxygen sensor voltage output exceeds 1.2 V for more than 10 seconds (2 trip detection logic)	Short in heated oxygen sensor (bank1, 2 sensor 2) circuit Heated oxygen sensor (bank1, 2 sensor 2) ECM Air fuel ratio sensor (bank1, 2 sensor 1)
P0139 P0159	Heated oxygen sensor (sensor 2) voltage does not drop to below 0.2 V immediately after fuel cut starts (2 trip detection logic) The heated oxygen sensor voltage does not drop from 0.35 V to 0.2 V immediately after fuel cut status (2 trip detection logic)	Short in heated oxygen sensor (bank1, 2 sensor 2) circuit Heated oxygen sensor (bank1, 2 sensor 2) Gas leak from exhaust system

FOR MEXICO MODELS

DTC No.	DTC Detection Condition	Trouble Area
P0136 P0156	Not applicable	None
P0137 P0157	Low voltage (open): During active air-fuel ratio control, following conditions (a) and (b) are met for a certain period of time (2 trip detection logic) (a) Heated oxygen sensor voltage output less than 0.21 V (b) Target air-fuel ratio rich	Open or short in heated oxygen sensor (bank1, 2 sensor 2) circuit Heated oxygen sensor (bank1, 2 sensor 2) Heated oxygen sensor heater (bank1, 2 sensor 2) Air fuel ratio sensor (bank1, 2 sensor 1) Gas leak from exhaust system
P0138 P0158	Not applicable	None
P0139 P0159	Not applicable	None

MONITOR DESCRIPTION

1. Active Air Fuel Ratio Control

   The ECM usually performs air fuel ratio feedback control so that the air fuel ratio sensor output indicates a near stoichiometric air fuel level. This vehicle includes active air fuel ratio control in addition to regular air fuel ratio control. The ECM performs active air fuel ratio control to detect any deterioration in the three-way catalytic converter and heated oxygen sensor malfunctions (refer to the diagram below).

   Active air fuel ratio control is performed for approximately 15 to 20 seconds while driving with a warm engine. During active air fuel ratio control, the air fuel ratio is forcibly regulated to become lean or rich by the ECM. If the ECM detects a malfunction, a DTC is set.

2. Abnormal Voltage Output of Heated Oxygen Sensor (DTC P0136 and P0156)

   While the ECM is performing active air-fuel ratio control, the air-fuel ratio is forcibly regulated to become rich or lean. If the sensor is not functioning properly, the voltage output variation is small. For example, when the HO2 sensor voltage does not increase to more than 0.59 V during active air-fuel ratio control, the ECM determines that the sensor voltage output is abnormal and stores DTCs P0136.

   Fig. 59: Heated Oxygen Sensor Circuit Voltage Variation Graph
   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

3. Open or Short in Heated Oxygen Sensor Circuit (DTCs P0137 and P0157 or P0138 and P0158)

   During active air-fuel ratio control, the ECM calculates the Oxygen Storage Capacity (OSC)* of the Three-Way Catalytic Converter (TWC) by forcibly regulating the air-fuel ratio to become rich or lean.

   If the HO2 sensor has an open, or the voltage output of the sensor noticeably decreases, the OSC indicates an extraordinarily high value. Even if the ECM attempts to continue regulating the air-fuel ratio to become rich or lean, the HO2 sensor output does not change.

   While performing active air-fuel ratio control, when the target air-fuel ratio is rich and the HO2 sensor voltage output is 0.21 V or less (lean), the ECM interprets this as an abnormally low sensor output voltage and stores DTC P0137.

   HINT:

   *: The TWC has the capability to store oxygen. The OSC and the emission purification capacity of the TWC are mutually related. The ECM determines whether the catalyst has deteriorated, based on the calculated OSC value, refer to DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1); DTC P0430: Catalyst System Efficiency Below Threshold (Bank 2) .

   Fig. 60: Identifying Heated Oxygen Circuit Low Voltage Graph
   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

4. High or Low Impedance of Heated Oxygen Sensor (DTCs P0136 and P0156 or P0137 and P0157)

   During normal air fuel ratio feedback control, there are small variations in the exhaust gas oxygen concentration. In order to continuously monitor the slight variation of the heated oxygen sensor signal while the engine is running, the impedance* of the sensor is measured by the ECM. The ECM determines that there is a malfunction in the sensor when the measured impedance deviates from the standard range.

   Fig. 61: Identifying DTC Detection Area
   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   *: The effective resistance in an alternating current electrical circuit.

   HINT:

   • The impedance cannot be measured using an ohmmeter.
   • DTCs P0136 indicate the deterioration of the heated oxygen sensor. The ECM sets the DTCs by calculating the impedance of the sensor when the typical enabling conditions are satisfied (2 driving cycles).
   • DTCs P0137 indicate an open or short circuit in the heated oxygen sensor (2 driving cycles). The ECM sets the DTCs when the impedance of the sensor exceeds the threshold 15 kohms.
5. Extremely High output Voltage of Heated Oxygen (HO2) Sensor (DTC P0138 and P0158)

   The ECM continuously monitors the heated oxygen sensor output voltage while the engine is running. DTC P0138 and P0158 are stored if the heated oxygen sensor voltage output is more than 1.2 V for 10 seconds or more.

6. Abnormal Voltage Output of Heated Oxygen Sensor During Fuel-cut (DTC P0139 and P0159)

   The sensor output voltage drops to below 0.2 V (extremely Lean status) immediately when the vehicle decelerates and fuel cut is operating. If the voltage does not drop to below 0.2 V for 7 seconds or more, or voltage does not drop from 0.35 V to 0.2 V for 1 second, the ECM determines that the sensor's response feature has deteriorated, illuminates the MIL and sets a DTC.

MONITOR STRATEGY

Related DTCs	P0136: Heated oxygen sensor output voltage (Output voltage) (bank 1) P0136: Heated oxygen sensor impedance (Low) (bank 1) P0137: Heated oxygen sensor output voltage (Low voltage) (bank 1) P0137: Heated oxygen sensor impedance (High) (bank 1) P0138: Heated oxygen sensor output voltage (Extremely high) (bank 1) P0139: Heated oxygen sensor output voltage during fuel cut (bank 1) P0156: Heated oxygen sensor output voltage (Output voltage) (bank 2) P0156: Heated oxygen sensor impedance (Low) (bank 2) P0157: Heated oxygen sensor output voltage (Low voltage) (bank 2) P0157: Heated oxygen sensor impedance (High) (bank 2) P0158: Heated oxygen sensor output voltage (Extremely high) (bank 2) P0159: Heated oxygen sensor output voltage during fuel cut (bank 2)
Required Sensors/Components (Main)	Heated oxygen sensor (sensor 2)
Required Sensors/Components (Related)	Crankshaft position sensor Engine coolant temperature sensor Mass air flow meter Throttle position sensor
Frequency of Operation	Once per driving cycle: Active air fuel ratio control detection, Abnormal voltage during fuel cut Continuous: Other
Duration	20 seconds: Heated oxygen sensor output (Output voltage, High voltage, Low voltage) 30 seconds: Heated oxygen sensor impedance (Low) 90 seconds: Heated oxygen sensor impedance (High) 10 seconds: Heated oxygen sensor voltage (Extremely high) 7 seconds: Heated oxygen sensor voltage during fuel cut
MIL Operation	2 driving cycles
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

All:

The monitor will run whenever these DTCs are not present

P0016, P0018 (VVT system bank 1, 2 - misalignment) P0017, P0019 (Exhaust VVT system bank 1, 2 - misalignment) P0031, P0032, P0051, P0052 (A/F sensor heater) P0037, P0038, P0057, P0058 (HO2 sensor heater) P0102, P0103 (MAF meter) P0112, P0113 (IAT sensor) P0115, P0117, P0118 (ECT sensor) P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (TP sensor) P0125 (Insufficient ECT for closed loop) P0128 (Thermostat) P0171, P0172, P0174, P0175 (Fuel system) P0301, P0302, P0303, P0304, P0305, P0306 (Misfire) P0335 (CKP sensor) P0451, P0452, P0453 (EVAP system) P0500 (Vehicle speed sensor) P2195, P2196, P2197, P2198 (A/F sensor - rationality) P2238, P2241, P2252, P2255 (A/F sensor - low impedance)

HEATED OXYGEN SENSOR OUTPUT VOLTAGE (OUTPUT VOLTAGE, LOW OUTPUT VOLTAGE):

Battery voltage	11 V or more
IAT	-10°C (14°F) or more
ECT	75°C (167°F) or more
Atmospheric pressure	76 kPa (570 mmHg) or more
Idle	OFF
Engine RPM	Less than 3200 RPM
Air fuel ratio sensor	Activated
Fuel system status	Closed loop
Engine load	10 to 70%
All of the following conditions are met	Conditions 1, 2 and 3
1. Mass air flow rate	5 to 60 g/sec.
2. Front catalyst temperature (estimated)	600 to 750°C (1112 to 1382°F)
3. Rear catalyst temperature (estimated)	100 to 900°C (212 to 1652°F)
Shift position	4th or more

HEATED OXYGEN SENSOR IMPEDANCE (LOW):

Battery voltage	11 V or more
Estimated sensor temperature	Less than 700°C (1292°F)
ECM monitor	Completed
DTC P0607	Not set

HEATED OXYGEN SENSOR IMPEDANCE (HIGH):

Battery voltage	11 V or more
Estimated sensor temperature	450°C (842°F) or higher and less than 750°C (1382°F)
DTC P0607	Not set

HEATED OXYGEN SENSOR OUTPUT VOLTAGE (EXTREMELY HIGH):

Battery voltage	11 V or more
Time after engine start	2 seconds or more

HEATED OXYGEN SENSOR VOLTAGE DURING FUEL CUT:

Engine coolant temperature	75°C (167°F) or more
Catalyst temperature	400°C (752°F) or more
Fuel cut	ON

TYPICAL MALFUNCTION THRESHOLDS

HEATED OXYGEN SENSOR OUTPUT VOLTAGE (OUTPUT VOLTAGE):

Either of following conditions met:	1 or 2
1. All of following conditions (a), (b) and (c) met	-
(a) Commanded air fuel ratio	14.3 or less
(b) Rear heated oxygen sensor voltage	0.21 to 0.59 V
(c) Oxygen storage capacity of catalyst	2.0 g or more
2. All of following conditions (d), (e) and (f) met	-
(d) Commanded air fuel ratio	14.9 or more
(e) Rear heated oxygen sensor voltage	0.21 to 0.59 V
(f) Oxygen storage capacity	2.0 g or more

HEATED OXYGEN SENSOR OUTPUT VOLTAGE (LOW OUTPUT VOLTAGE):

All of following conditions (a), (b) and (c) met	-
(a) Commanded air fuel ratio	14.3 or less
(b) Rear heated oxygen sensor voltage	Less than 0.21 V
(c) OSC (Oxygen Storage Capacity of Catalyst)	2.0 g or more

HEATED OXYGEN SENSOR IMPEDANCE (LOW):

Duration of following condition	30 seconds or more
Heated oxygen sensor impedance	Less than 5 ohms

HEATED OXYGEN SENSOR IMPEDANCE (HIGH):

Duration of following condition	90 seconds or more
Heated oxygen sensor impedance	15 kohms or more

HEATED OXYGEN SENSOR OUTPUT VOLTAGE (EXTREMELY HIGH):

Duration of following condition	10 seconds or more
Heated oxygen sensor voltage	1.2 V or higher

HEATED OXYGEN SENSOR VOLTAGE DURING FUEL-CUT:

Duration until rear heated oxygen sensor voltage drops to 0.2 V after fuel cut	7 seconds or more
During that heated oxygen sensor voltage from 0.35 V to 0.2 V during fuel cut	1 second or more

COMPONENT OPERATING RANGE

Duration of following condition	30 seconds or more
Heated oxygen sensor voltage	Varies between 0.1 V and 0.9 V

MONITOR RESULT

Refer to CHECKING MONITOR STATUS, refer to CHECKING MONITOR STATUS .

WIRING DIAGRAM

Fig. 62: Identifying Relationship Between Element Temperature And Impedance Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

CONFIRMATION DRIVING PATTERN

P0136, P0137, P0138, P0156, P0157 and P0158

Fig. 63: Identifying Confirmation Driving Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch on (IG) and turn the Techstream on [A].
6. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [B].
7. With the transmission in 4th gear or higher, drive the vehicle at 60 to 120 km/h (40 to 75 mph) for 10 minutes or more [C].

   WARNING:

   When performing the confirmation driving pattern, obey all speed limits and traffic laws.

8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].
9. Read the pending DTCs.

   HINT:

   • If a pending DTC is output, the system is malfunctioning.
   • If a pending DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
11. Input the DTC: P0136, P0137, P0138, P0156, P0157 or P0158.
12. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [C] through [D].
13. If no pending DTC is output, perform a universal trip and check for permanent DTCs, refer to DTC CHECK / CLEAR .

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

P0139 and P0159

Fig. 64: Identifying Confirmation Driving Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch on (IG) and turn the Techstream on [A].
6. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [B].
7. Drive the vehicle at 60 km/h (40 mph), and then decelerate the vehicle by releasing the accelerator pedal for 5 seconds or more to perform the fuel-cut [C].

   WARNING:

   When performing the confirmation driving pattern, obey all speed limits and traffic laws.

8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].
9. Read the DTCs.

   HINT:

   • If a pending DTC or current DTC is output, the system is malfunctioning.
   • If a pending DTC or current DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
11. Input the DTC: P0139 or P0159.
12. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or UNKNOWN, shift the transmission to 2nd gear, and then perform steps [C] and [D] again.
13. If no pending DTC is output, perform a universal trip and check for permanent DTCs, refer to DTC CHECK / CLEAR .

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

NOTE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT:

Malfunctioning areas can be identified by performing the Control the Injection Volume for A/F sensor function provided in the Active Test. The Control the Injection Volume for A/F sensor function can help to determine whether the air fuel ratio sensor, heated oxygen sensor and other potential trouble areas are malfunctioning.

The following instructions describe how to conduct the Control the Injection Volume for A/F sensor operation using the Techstream.

1. Connect the Techstream to the DLC3.
2. Start the engine.
3. Turn the tester on.
4. Warm up the engine at an engine speed of 2500 RPM for approximately 90 seconds.
5. Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F sensor.
6. Perform the Active Test operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume.)
7. Monitor the output voltages of the air fuel ratio and heated oxygen sensors (AFS Voltage B1 S1 or AFS Voltage B2 S1 and O2S B1 S2 or O2S B2 S2) displayed on the tester.

HINT:

• The Control the Injection Volume for air fuel ratio sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%.
• Each sensor reacts in accordance with increases and decreases in the fuel injection volume.

Tester Display	Injection Volume	Status	Voltage
AFS Voltage B1 S1 or AFS Voltage B2 S1 (Air fuel ratio sensor)	+25%	Rich	Less than 3.1 V
	-12.5%	Lean	More than 3.4 V
O2S B1 S2 or O2S B2 S2 (Heated oxygen sensor)	+25%	Rich	More than 0.55 V
	-12.5%	Lean	Less than 0.4 V

NOTE:

The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.

Case	Air Fuel Ratio Sensor (Sensor 1) Output Voltage	Heated Oxygen Sensor (Sensor 2) Output Voltage	Main Suspected Trouble Area
1	click to open the image	click to open the image	-
2	click to open the image	click to open the image	Air fuel ratio sensor Air fuel ratio sensor heater Air fuel ratio sensor circuit
3	click to open the image	click to open the image	Heated oxygen sensor Heated oxygen sensor heater Heated oxygen sensor circuit
4	click to open the image	click to open the image	Fuel pressure Gas leakage from exhaust system (Air fuel ratio extremely lean or rich)

• Following the Control the Injection Volume for A/F sensor procedure enables technicians to check and graph the voltage outputs of both the air fuel ratio and heated oxygen sensors.
• To display the graph, select the following menu items: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / A/F Control System / AFS Voltage B1 S1 or AFS Voltage B2 S1 and O2S B1 S2 or O2S B2 S2 then press the graph button on the Data List view.
• Bank 1 refers to the bank that includes the No. 1 cylinder*.

  *: The No. 1 cylinder is the cylinder which is farthest from the transmission.

• Bank 2 refers to the bank that does not include the No. 1 cylinder.

HINT:

• Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
• If the OX1B or OX2B wire from the ECM connector is short-circuited to the +B wire, DTC P0136 or P0156 may be set.

PROCEDURE

1. READ DTC OUTPUT (DTC P0136, P0137, P0138, P0156, P0157 OR P0158)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG).
   3. Turn the tester on.
   4. Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.
   5. Read DTCs.

      Result

      Result	Proceed to
      P0138 or P0158	A
      P0137 or P0157	B
      P0136 or P0156	C
      P0139 or P0159	D
      P0136, P0137, P138, P0156, P0157 or P0158 and other DTCs are output	E

   B --> See step 6

   C --> See step 4

   D --> See step 15

   E --> GO TO DTC CHART

   A: Go to next step

2. INSPECT HEATED OXYGEN SENSOR (CHECK FOR SHORT)
   1. Disconnect the heated oxygen sensor connector.

      Fig. 65: Identifying Heated Oxygen Sensor Connector
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Bank 1

      Bank 2

      Tester Connection	Condition	Specified Condition
      2 (+B) - 4 (E2)	Always	10 kohms or higher
      2 (+B) - 3 (OX1B)

      Tester Connection	Condition	Specified Condition
      2 (+B) - 4 (E2)	Always	10 kohms or higher
      2 (+B) - 3 (OX2B)

      TEXT IN ILLUSTRATION
      

      *1	Bank 1
      *2	Bank 2
      *a	Component without harness connected (Heated Oxygen Sensor)

   3. Reconnect the heated oxygen sensor connector.

   NG --> See step 19

   OK: Go to next step

3. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)
   1. Turn the ignition switch off and wait for 5 minutes or more.
   2. Disconnect the ECM connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Bank 1

      Bank 2

      Tester Connection	Condition	Specified Condition
      B48-12 (HT1B) - B51-2 (OX1B)	Always	10 kohms or higher

      Tester Connection	Condition	Specified Condition
      B48-13 (HT2B) - B51-4 (OX2B)	Always	10 kohms or higher

   4. Reconnect the ECM connector.

   NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK --> See step 20

4. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG).
   3. Turn the Techstream on.
   4. Warm up the engine.
   5. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume.
   6. Change the fuel injection volume using the Techstream, and monitor the voltage output of air fuel ratio and heated oxygen sensors displayed on the Techstream.

      HINT:

      • Change the fuel injection volume within the range of -12% and +12%. The injection volume can be changed in 0.1% or 0.2% graduations within the range.
      • The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.

      Standard Voltage

      Fluctuates between 0.4 V or less and 0.55 V or more.

   NG --> See step 6

   OK: Go to next step

5. PERFORM ACTIVE TEST USING TECHSTREAM
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG).
   3. Turn the tester on.
   4. Start the engine and warm it up.
   5. Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the Injection Volume.
   6. Change the fuel injection volume using the tester, and monitor the voltage output of air fuel ratio and heated oxygen sensors displayed on the tester.

      HINT:

      • Change the fuel injection volume within the range of -12% and +12%. The injection volume can be changed in 1% graduations within the range.
      • The air fuel ratio sensor is displayed as AFS Voltage B1 S1 or AFS Voltage B2 S1, and the heated oxygen sensor is displayed as O2S B1 S2 or O2S B2 S2 on the Techstream.
      • The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of a approximately 20 seconds.

      Result

      Tester Display	Voltage Variation	Proceed to
      AFS Voltage B1 S1 or AFS Voltage B2 S1 (Air fuel ratio sensor)	Alternates between more and less than 3.3 V	OK
      	Remains at more than 3.3 V	NG
      	Remains at less than 3.3 V	NG

      HINT:

      A normal heated oxygen sensor voltage (O2S B1 S2 or O2S B2 S2) reacts in accordance with increases and decreases in fuel injection volumes. When the air fuel ratio sensor voltage remains at either less or more than 3.3 V despite the heated oxygen sensor indicating a normal reaction, the air fuel ratio sensor is malfunctioning.

      Fig. 66: A/F Sensor Voltage Graph
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   NG --> See step 12

   OK --> CHECK ENGINE TO DETERMINE CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO

6. CHECK FOR EXHAUST GAS LEAK
   1. Check for exhaust gas leaks from the exhaust manifold sub-assembly and exhaust pipes.

      OK

      No gas leak.

   NG --> REPAIR OR REPLACE EXHAUST GAS LEAK POINT

   OK: Go to next step

7. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE) See step 1

   NG --> See step 19

   OK: Go to next step

8. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM)
   1. Disconnect the heated oxygen sensor connector.
   2. Disconnect the ECM connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)

      Bank 1

      Bank 2

      Tester Connection	Condition	Specified Condition
      P1-1 (HT1B) - B48-12 (HT1B)	Always	Below 1 ohms
      P1-3 (OX1B) - B51-2 (OX1B)
      P1-4 (E2) - B51-1 (EX1B)

      Tester Connection	Condition	Specified Condition
      B39-1 (HT2B) - B48-13 (HT2B)	Always	Below 1 ohms
      B39-3 (OX2B) - B51-4 (OX2B)
      B39-4 (E2) - B51-3 (EX2B)

      Standard resistance (Check for short)

      Bank 1

      Bank 2

      Tester Connection	Condition	Specified Condition
      P1-1 (HT1B) or B48-12 (HT1B) - Body ground	Always	10 kohms or higher
      P1-3 (OX1B) or B51-12 (OX1B) - Body ground

      Tester Connection	Condition	Specified Condition
      B39-1 (HT2B) or B48-13 (HT2B) - Body ground	Always	10 kohms or higher
      B39-3 (OX2B) or B51-4 (OX2B) - Body ground

   4. Reconnect the heated oxygen sensor connector.
   5. Reconnect the ECM connector.

   NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK: Go to next step

9. REPLACE HEATED OXYGEN SENSOR
   1. Replace the heated oxygen sensor, refer to COMPONENTS .

   NEXT: Go to next step

10. PERFORM CONFIRMATION DRIVING PATTERN

    HINT:

    Refer to the CONFIRMATION DRIVING PATTERN for P0136, P0137, P0138, P0156, P0157 or P0158.

    NEXT: Go to next step

11. CHECK WHETHER DTC OUTPUT RECURS (DTC P0136, P0137, P0138, P0156, P0157 OR P0158)
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch on (IG).
    3. Turn the tester on.
    4. Select the following menu items: Powertrain / Engine and ECT / Utility / All Readiness.
    5. Input DTCs: P0136, P0137, P0138, P0156, P0157 and P0158.

       Check the DTC MONITOR is NORMAL. If DTC MONITOR is INCOMPLETE, perform the drive pattern increasing the vehicle speed and using the second gear to decelerate the vehicle.

       Result

       Result	Proceed to
       ABNORMAL (DTC P0136, P0137, P0138, P0156, P0157 or P0158 is output)	A
       NORMAL (DTC is not output)	B

    B --> END

    A --> See step 21

12. REPLACE AIR FUEL RATIO SENSOR
    1. Replace the air fuel ratio sensor, refer to COMPONENTS .

    NEXT: Go to next step

13. PERFORM CONFIRMATION DRIVING PATTERN

    HINT:

    Refer to the CONFIRMATION DRIVING PATTERN for P0136, P0137, P0138, P0156, P0157 or P0158.

    NEXT: Go to next step

14. CHECK WHETHER DTC OUTPUT RECURS (DTC P0136, P0137, P0138, P0156, P0157 OR P0158)
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch on (IG).
    3. Turn the tester on.
    4. Select the following menu items: Powertrain / Engine and ECT / Utility / All Readiness.
    5. Input DTCs: P0136, P0137, P0138, P0156, P0157 and P0158.

       Check the DTC MONITOR is NORMAL. If DTC MONITOR is INCOMPLETE, perform the drive pattern increasing the vehicle speed and using the second gear to decelerate the vehicle.

       Result

       Result	Proceed to
       NORMAL (DTC is not output)	A
       ABNORMAL (DTC P0136, P0137, P0138, P0156, P0157 or P0158 is output)	B

    B --> See step 19

    A --> END

15. CHECK FOR EXHAUST GAS LEAK
    1. Inspect for exhaust gas leaks from the exhaust manifold sub-assembly and exhaust pipes.

       OK

       No gas leakage.

    B --> REPAIR OR REPLACE EXHAUST GAS LEAK POINT

    A: Go to next step

16. INSPECT HEATED OXYGEN SENSOR (CHECK FOR SHORT)
    1. Turn the ignition switch off and wait for 5 minutes or more.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

       Standard resistance

       Bank 1

       Bank 2

       Tester Connection	Condition	Specified Condition
       B48-12 (HT1B) - B51-2 (OX1B)	Always	10 kohms or higher

       Tester Connection	Condition	Specified Condition
       B48-13 (HT2B) - B51-4 (OX2B)	Always	10 kohms or higher

    4. Reconnect the ECM connector.

    NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK: Go to next step

17. PERFORM CONFIRMATION DRIVING PATTERN
    1. Perform the Confirmation Driving Pattern (P0139).

    NEXT: Go to next step

18. READ DTC OUTPUT (DTC P0139 IS OUTPUT AGAIN)
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
    5. Input DTCs: P0139 and P0159.
    6. Check that the DTC monitor is NORMAL. If the DTC monitor is INCOMPLETE, perform the drive pattern again but increase the vehicle speed.

       Result

       Result	Proceed to
       ABNORMAL (DTC P0139 or P0159 is output)	A
       NORMAL (DTC is not output)	B

    B --> CHECK FOR INTERMITTENT PROBLEMS

    A --> See step 19

19. REPLACE HEATED OXYGEN SENSOR. Refer to COMPONENTS
20. REPLACE ECM. Refer to COMPONENTS
21. REPLACE AIR FUEL RATIO SENSOR. Refer to COMPONENTS

DTC P014C: A/F Sensor Slow Response - Rich to Lean Bank 1 Sensor 1; DTC P014D: A/F Sensor Slow Response - Lean to Rich Bank 1 Sensor 1; DTC P014E: A/F Sensor Slow Response - Rich to Lean Bank 2 Sensor 1; DTC P014F: A/F Sensor Slow Response - Lean to Rich Bank 2 Sensor 1; DTC P015A: A/F Sensor Delayed Response - Rich to Lean Bank 1 Sensor 1; DTC P015B: A/F Sensor Delayed Response - Lean to Rich Bank 1 Sensor 1; DTC P015C: A/F Sensor Delayed Response - Rich to Lean Bank 2 Sensor 1; DTC P015D: A/F Sensor Delayed Response - Lean to Rich Bank 2 Sensor 1

DESCRIPTION

HINT:

• Refer to DTC P2195, refer to DESCRIPTION .
• Sensor 1 refers to the sensor mounted in front of the three-way catalytic converter and located near the engine assembly.

DTC No.	DTC Detection Condition	Trouble Area
P014C P014E	The "Rich to Lean response rate deterioration level*" value is standard or less. (2 trip detection logic)	Air fuel ratio sensor Air fuel ratio sensor heater ECM
P014D P014F	The "Lean to Rich response rate deterioration level*" value is standard or more. (2 trip detection logic)
P015A P015C	The "Rich to Lean delay level*" value is standard or less. (2 trip detection logic)
P015B P015D	The "Lean to Rich delay level*" value is standard or more. (2 trip detection logic)

* Calculated by ECM based on the A/F sensor output

MONITOR DESCRIPTION

After the engine is warm, the ECM carries out air-fuel ratio feedback control, and maintains the air-fuel ratio at the theoretical level. In addition, after all the preconditions have been met, active air-fuel ratio control is carried out for approx. 10 seconds, and during active air-fuel ratio control, the ECM measures the response of the the A/F sensor by increasing or decreasing a specific injection quantity based on the theoretical air-fuel ratio learned during normal air-fuel control. The ECM determines whether there is an A/F sensor malfunction at the mid-point of active air-fuel ratio control.

If the A/F sensor's response ability is reduced, DTC P014C, P014D, P014E and P014F are output.

If the time it takes the A/F sensor output to change is delayed, DTC P015A, P015B, P015C and P015D are output.

Fig. 67: Identifying Air-Fuel Ratio (A/F) Sensor Output
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

MONITOR STRATEGY

Related DTCs	P014C: Air fuel ratio sensor (bank 1) slow response (rich to lean) P014D: Air fuel ratio sensor (bank 1) slow response (lean to rich) P014E: Air fuel ratio sensor (bank 2) slow response (rich to lean) P014F: Air fuel ratio sensor (bank 2) slow response (lean to rich) P015A: Air fuel ratio sensor (bank 1) delayed response (rich to lean) P015B: Air fuel ratio sensor (bank 1) delayed response (lean to rich) P015C: Air fuel ratio sensor (bank 2) delayed response (rich to lean) P015D: Air fuel ratio sensor (bank 2) delayed response (lean to rich)
Required Sensors/Components (Main)	Air fuel ratio sensor
Required Sensors/Components (Related)	Vehicle speed sensor, crankshaft position sensor
Frequency of Operation	Once per driving cycle
Duration	10 to 15 seconds
MIL Operation	2 driving cycles
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever following DTCs are not stored	None
Active air fuel ratio control	Performing
Active air fuel ratio control is performed when the following conditions are met	-
Battery voltage	11 V or higher
Engine coolant temperature	75°C (167°F) or more
Idle	OFF
Engine speed	1000 to 4000 RPM
Air fuel ratio sensor status	Activated
Fuel-cut	OFF
Engine load	10 to 70%
Shift position	2nd or higher
Catalyst monitor	Not yet
Mass air flow	21 to 52 g/sec.

TYPICAL MALFUNCTION THRESHOLDS

AIR FUEL RATIO SENSOR (BANK 1, 2) SLOW RESPONSE (RICH TO LEAN)

Rich to Lean Response rate deterioration level

0.045 V or less

AIR FUEL RATIO SENSOR (BANK 1, 2) SLOW RESPONSE (LEAN TO RICH)

Lean to Rich Response rate deterioration level

0.045 V or higher

AIR FUEL RATIO SENSOR (BANK 1, 2) DELAYED RESPONSE (RICH TO LEAN)

Rich to Lean delay level

200 msec or more

AIR FUEL RATIO SENSOR (BANK 1, 2) DELAYED RESPONSE (LEAN TO RICH)

Lean to Rich delay level

200 msec or more

MONITOR RESULT

Refer to Checking Monitor Status, refer to CHECKING MONITOR STATUS .

CONFIRMATION DRIVING PATTERN

HINT:

Performing this confirmation pattern will activate the air fuel ratio sensor response monitor.

Fig. 68: Identifying Confirmation Driving Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure), refer to DTC CHECK / CLEAR .
5. Turn the ignition switch off.
6. Turn the ignition switch on (IG) and turn the Techstream on.
7. Enter the following menus: Powertrain / Engine / Monitor / O2 Sensor / Details.
8. Check that the RES RATE B1S1 and RES RATE B2S1 are Incomplete.
9. Start the engine and warm it up (until the engine coolant temperature is 75°C (167°F) or higher) [A].
10. Drive the vehicle at a constant speed of between 47 and 62 mph (75 and 100 km/h) for 10 minutes [B].
11. Check the monitor result values on Techstream by entering the following menus: Powertrain / Engine / Monitor / O2 Sensor / Details / RES RATE B1S1 and RES RATE B2S1.
12. If the values indicated on the Techstream do not change, perform Readiness Monitor Drive Pattern for the air fuel ratio sensor and heated oxygen sensor, refer to READINESS MONITOR DRIVE PATTERN .
13. Note the value of the Monitor Result.
14. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
15. Read the pending DTC [C].
16. If a pending DTC is output, the system is malfunctioning.

    HINT:

    If a pending DTC is not output, perform the following procedure.

17. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
18. Input the DTC: P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D.
19. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows INCOMPLETE or UNKNOWN, perform step [B] again.
20. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
21. Check the judgment result.

    HINT:

    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows NORMAL, the system is normal.
22. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs, refer to DTC CHECK / CLEAR .

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to DTC P2195, refer to WIRING DIAGRAM .

INSPECTION PROCEDURE

HINT:

Malfunctioning areas can be identified by performing the Control the Injection Volume for A/F Sensor function provided in the Active Test. The Control the Injection Volume for A/F Sensor function can help to determine whether the air fuel ratio sensor, heated oxygen sensor and other potential trouble areas are malfunctioning.

The following instructions describe how to conduct the Control the Injection Volume for A/F Sensor operation using the Techstream.

1. Connect the Techstream to the DLC3.
2. Start the engine.
3. Turn the Techstream on.
4. Warm up the engine at an engine speed of 2500 RPM for approximately 90 seconds.
5. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor.
6. Perform the Active Test operation with the engine idling (press the RIGHT or LEFT button to change the fuel injection volume.)
7. Monitor the output voltages of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2) displayed on the Techstream.

HINT:

• The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%.
• Each sensor reacts in accordance with increases and decreases in the fuel injection volume.

Techstream Display (Sensor)	Injection Volume	Status	Voltage
AFS Voltage B1S1 or AFS Voltage B2S1 (Air fuel ratio)	+25%	Rich	Less than 3.1 V
AFS Voltage B1S1 or AFS Voltage B2S1 (Air fuel ratio)	-12.5%	Lean	More than 3.4 V
O2S B1S2 or O2S B2S2 (Heated oxygen)	+25%	Rich	More than 0.55 V
O2S B1S2 or O2S B2S2 (Heated oxygen)	-12.5%	Lean	Less than 0.4 V

NOTE:

The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.

Case	Air Fuel Ratio Sensor (Sensor 1) Output Voltage	Heated Oxygen Sensor (Sensor 2) Output Voltage	Main Suspected Trouble Area
1	click to open the image	click to open the image	-
2	click to open the image	click to open the image	Air fuel ratio sensor Air fuel ratio sensor heater Air fuel ratio sensor circuit
3	click to open the image	click to open the image	Heated oxygen sensor Heated oxygen sensor heater Heated oxygen sensor circuit Exhaust gas leaks
4	click to open the image	click to open the image	Fuel pressure Exhaust gas leaks (Air fuel ratio extremely lean or rich)

• Following the Control the Injection Volume for A/F Sensor procedure enables technicians to check and graph the voltage outputs of both the air fuel ratio and heated oxygen sensors.
• To display the graph, enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / A/F Control System / AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2; and then press the graph button on the Data List view.
• Bank 1 refers to the bank that includes the No. 1 cylinder*.

  *: The No. 1 cylinder is the cylinder which is farthest from the transmission.

• Bank 2 refers to the bank that does not include the No. 1 cylinder.

HINT:

• A low air fuel ratio sensor voltage could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
• A high air fuel ratio sensor voltage could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.
• Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C OR P015D)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG).
   3. Turn the Techstream on.
   4. Enter the following menus: Powertrain / Engine / Trouble Codes.
   5. Read the DTCs.

      RESULT
      

      Result	Proceed to
      DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C or P015D is output	A
      DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C or P015D and other DTCs are output	B

      HINT:

      If any DTCs other than P014C, P014D, P014E, P014F, P015A, P015B, P015C or P015D are output, troubleshoot those DTCs first.

   B --> See step 10

   A: Go to next step

2. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) See step 1

   NG --> See step 11

   OK: Go to next step

3. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM) See step 3

   NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK: Go to next step

4. INSPECT AIR FUEL RATIO SENSOR
   1. Check that the proper air fuel ratio sensors are installed to the vehicle.

   NG --> See step 12

   OK: Go to next step

5. PERFORM CONFIRMATION DRIVING PATTERN
   1. Drive the vehicle according to the Confirmation Driving Pattern.

   NEXT: Go to next step

6. CHECK WHETHER DTC OUTPUT RECURS (DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C OR P015D)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG).
   3. Turn the Techstream on.
   4. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
   5. Read the DTCs.

      RESULT
      

      Result	Proceed to
      DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C and/or P015D are output	A
      DTC is not output	B

   B --> See step 13

   A: Go to next step

7. REPLACE AIR FUEL RATIO SENSOR
   1. Replace the air fuel ratio sensor, refer to REMOVAL .

   NEXT: Go to next step

8. PERFORM CONFIRMATION DRIVING PATTERN
   1. Drive the vehicle according to the Confirmation Driving Pattern.

   NEXT: Go to next step

9. CHECK WHETHER DTC OUTPUT RECURS (DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C OR P015D)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG).
   3. Turn the Techstream on.
   4. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
   5. Read the pending DTCs.

      RESULT
      

      Result	Proceed to
      DTC is not output	A
      DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C and/or P015D are output	B

   B --> See step 14

   A --> END

10. GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART
11. REPLACE AIR FUEL RATIO SENSOR. Refer to REMOVAL
12. REPLACE AIR FUEL RATIO SENSOR. Refer to REMOVAL
13. CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS
14. CHECK ENGINE TO DETERMINE CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO. Refer to DTC P0171: System Too Lean (Bank 1); DTC P0172: System Too Rich (Bank 1); DTC P0174: System Too Lean (Bank 2); DTC P0175: System Too Rich (Bank 2)

DTC P0171: System Too Lean (Bank 1); DTC P0172: System Too Rich (Bank 1); DTC P0174: System Too Lean (Bank 2); DTC P0175: System Too Rich (Bank 2)

DESCRIPTION

The fuel trim is related to the feedback compensation value, not to the basic injection time. The fuel trim consists of both the short-term and long-term fuel trims.

The short-term fuel trim is fuel compensation that is used to constantly maintain the air fuel ratio at stoichiometric levels. The signal from the air fuel ratio sensor indicates whether the air fuel ratio is rich or lean compared to the stoichiometric ratio. This triggers a reduction in the fuel injection volume if the air fuel ratio is rich and an increase in the fuel injection volume if it is lean.

Factors such as individual engine differences, wear over time and changes in operating environment cause short-term fuel trim to vary from the central value. The long-term fuel trim, which controls overall fuel compensation, compensates for long-term deviations in the fuel trim from the central value caused by the short- term fuel trim compensation.

If both the short-term and long-term fuel trims are lean or rich beyond predetermined values, it is interpreted as a malfunction, and the ECM illuminates the MIL and sets a DTC.

DTC No.	DTC Detection Condition	Trouble Area
P0171 P0174	With warm engine and stable air fuel ratio feedback, fuel trim considerably in error to lean side (2 trip detection logic)	Air induction system Injector blockage Mass air flow meter Engine coolant temperature sensor Fuel pressure Gas leak from exhaust system Open or short in air fuel ratio sensor (bank 1, 2 sensor 1) circuit Air fuel ratio sensor (bank 1, 2 sensor 1) EFI NO. 2 fuse PCV valve and hose PCV hose connections ECM Wire harness or connector
P0172 P0175	With warm engine and stable air fuel ratio feedback, fuel trim considerably in error to rich side (2 trip detection logic)	Injector leak or blockage Mass air flow meter Engine coolant temperature sensor Ignition system Fuel pressure Gas leak from exhaust system Open or short in air fuel ratio sensor (bank 1, 2 sensor 1) circuit Air fuel ratio sensor (bank 1, 2 sensor 1) EFI NO. 2 fuse ECM Wire harness or connector

HINT:

• When DTC P0171 or P0174 is set, the actual air fuel ratio is on the lean side. When DTC P0172 or P0175 is set, the actual air fuel ratio is on the rich side.
• If the vehicle runs out of fuel, the air fuel ratio is lean and DTC P0171 or P0174 may be set. The MIL is then illuminated.
• When the total of the short-term and long-term fuel trim values is within the malfunction threshold (and the engine coolant temperature is more than 75°C [167°F]), the system is functioning normally.

MONITOR DESCRIPTION

Under closed-loop fuel control, fuel injection volumes that deviate from those estimated by the ECM cause changes in the long-term fuel trim compensation value. The long-term fuel trim is adjusted when there are persistent deviations in the short-term fuel trim values. Deviations from the ECM's estimated fuel injection volumes also affect the average fuel trim learning value, which is a combination of the average short-term fuel trim (fuel feedback compensation value) and the average long-term fuel trim (learning value of the air fuel ratio). If the average fuel trim learning value exceeds the malfunction thresholds, the ECM interprets this a fault in the fuel system and sets a DTC.

Example:

The average fuel trim learning value is more than +35% or less than -35%, the ECM interprets this as a fuel system malfunction.

Fig. 69: Fuel System Malfunction Threshold Condition Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

MONITOR STRATEGY

Related DTCs	P0171: Fuel trim Lean (bank 1) P0172: Fuel trim Rich (bank 1) P0174: Fuel trim Lean (bank 2) P0175: Fuel trim Rich (bank 2)
Required Sensors/Components (Main)	Fuel system
Required Sensors/Components (Related)	Air fuel ratio sensor Mass air flow meter Crankshaft position sensor
Frequency of Operation	Continuous
Duration	Less than 10 seconds
MIL Operation	2 driving cycles
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

FUEL-TRIM:

The monitor will run whenever these DTCs are not present	P0010, P0020 (OCV bank 1, 2) P0011, P0021 (VVT system bank 1, 2 - advance) P0012, P0022 (VVT system bank 1, 2 - retard) P0013, P0023 (Exhaust OCV bank 1, 2) P0014, P0024 (Exhaust VVT system bank 1, 2 - advance) P0015, P0025 (Exhaust VVT system bank 1, 2 - retard) P0016, P0018 (VVT system bank 1, 2 - misalignment) P0017, P0019 (Exhaust VVT system bank 1, 2 - misalignment) P0031, P0032, P0051, P0052 (A/F sensor heater) P0102, P0103 (MAF meter) P0115, P0117, P0118 (ECT sensor) P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (TP sensor) P0125 (Insufficient ECT for closed loop) P0335 (CKP sensor) P0340, P0342, P0343, P0345, P0347, P0348 (VVT sensor) P0351, P0352, P0353, P0354, P0355, P0356 (Igniter) P0365, P0367, P0368, P0390, P0392, P0393 (Exhaust VVT sensor) P0500 (Vehicle speed sensor)
Fuel system status	Closed-loop
Battery voltage	11 V or more
Either of following conditions 1 or 2 set	-
1. Engine RPM	Less than 1100 RPM
2. Intake air amount per revolution	0.22 g/rev or more
Catalyst monitor	No executed

TYPICAL MALFUNCTION THRESHOLDS

FUEL-TRIM:

Purge-cut	Executing
Either of following conditions 1 or 2 met	-
1. Average between short-term fuel trim and long-term fuel trim	35% or more (varies with engine coolant temperature)
2. Average between short-term fuel trim and long-term fuel trim	-35% or less (varies with engine coolant temperature)

WIRING DIAGRAM

Refer to DTC P2195, refer to DTC P2195: Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1); DTC P2196: Oxygen (A/F) Sensor Signal Stuck Rich (Bank 1 Sensor 1); DTC P2197: Oxygen (A/F) Sensor Signal Stuck Lean (Bank 2 Sensor 1); DTC P2198: Oxygen (A/F) Sensor Signal Stuck Rich (Bank 2 Sensor 1) .

CONFIRMATION DRIVING PATTERN

Fig. 70: Identifying Confirmation Driving Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn the Techstream on.
3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch on (IG) and turn the Techstream on [A].
6. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off [B].
7. With the engine warmed up, idle the engine for 2 minutes or more [C].
8. Drive the vehicle at a speed between 60 and 135 km/h (38 and 85 mph) for 5 minutes or more [D].

   WARNING:

   When performing the confirmation driving pattern, obey all speed limits and traffic laws.

9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [E].
10. Read the pending DTCs.

    HINT:

    If a pending DTC is output, the system is malfunctioning.

11. If no pending DTC is output, perform a universal trip and check for permanent DTCs, refer to DTC CHECK / CLEAR .

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

NOTE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT:

Malfunctioning areas can be identified by performing the Control the Injection Volume for A/F sensor function provided in the Active Test. The Control the Injection Volume for A/F sensor function can help to determine whether the air fuel ratio sensor, heated oxygen sensor and other potential trouble areas are malfunctioning.

The following instructions describe how to conduct the Control the Injection Volume for A/F sensor operation using the Techstream.

1. Connect the Techstream to the DLC3.
2. Start the engine.
3. Turn the tester on.
4. Warm up the engine at an engine speed of 2500 RPM for approximately 90 seconds.
5. Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F sensor.
6. Perform the Active Test operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume.)
7. Monitor the output voltages of the air fuel ratio and heated oxygen sensors (AFS Voltage B1 S1 or AFS Voltage B2 S1 and O2S B1 S2 or O2S B2 S2) displayed on the tester.

HINT:

• The Control the Injection Volume for A/F sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%.
• Each sensor reacts in accordance with increases and decreases in the fuel injection volume.

Tester Display	Injection Volume	Status	Voltage
AFS Voltage B1 S1 AFS Voltage B2 S1 (Air fuel ratio sensor)	+25%	Rich	Less than 3.1 V
	-12.5%	Lean	More than 3.4 V
O2S B1 S2 O2S B2 S2 (Heated oxygen)	+25%	Rich	More than 0.55 V
	-12.5%	Lean	Less than 0.4 V

NOTE:

The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.

Case	Air Fuel Ratio Sensor (Sensor 1) Output Voltage	Heated Oxygen Sensor (Sensor 2) Output Voltage	Main Suspected Trouble Area
1	click to open the image	click to open the image	-
2	click to open the image	click to open the image	Air fuel ratio sensor Air fuel ratio sensor heater Air fuel ratio sensor circuit
3	click to open the image	click to open the image	Heated oxygen sensor Heated oxygen sensor heater Heated oxygen sensor circuit
4	click to open the image	click to open the image	Fuel pressure Gas leakage from exhaust system (Air fuel ratio extremely lean or rich)

• Following the Control the Injection Volume for A/F sensor procedure enables technicians to check and graph the voltage outputs of both the air fuel ratio and heated oxygen sensors.
• To display the graph, select the following menu items:

  Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / A/F Control System / AFS Voltage B1 S1 or AFS Voltage B2 S1 and O2S B1 S2 or O2S B2 S2; then press the graph button on the Data List view.

HINT:

• Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
• Bank 1 refers to the bank that includes the No. 1 cylinder*.

  *: The No. 1 cylinder is the cylinder which is farthest from the transmission.

• Bank 2 refers to the bank that does not include the No. 1 cylinder.
• A low air fuel ratio sensor voltage could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
• A high air fuel ratio sensor voltage could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.

PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0171, P0172, P0174 OR P0175)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG).
   3. Turn the tester on.
   4. Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.
   5. Read DTCs.

      Result

      Result	Proceed to
      P0171, P0172, P0174 or P0175	A
      P0171, P0172, P0174 or P0175 and other DTCs	B

      HINT:

      If any DTCs other than P0171, P0172, P0174 or P0175 are output, troubleshoot those DTCs first.

   B --> See step 23

   A: Go to next step

2. CHECK PCV HOSE CONNECTIONS
   1. Check the PCV hose connections.

      OK

      PCV hose is connected correctly and is not damaged.

   NG --> REPAIR OR REPLACE PCV HOSE

   OK: Go to next step

3. CHECK AIR INDUCTION SYSTEM
   1. Check the air induction system for vacuum leak, refer to ON-VEHICLE INSPECTION .

      OK

      No leak from air induction system.

   NG --> REPAIR OR REPLACE AIR INDUCTION SYSTEM

   OK: Go to next step

4. PERFORM ACTIVE TEST USING TECHSTREAM (AIR FUEL RATIO CONTROL)
   1. Connect the Techstream to the DLC3.
   2. Start the engine.
   3. Turn the tester on.
   4. Warm up the engine at an engine speed of 2500 RPM for approximately 90 seconds.
   5. Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor.
   6. Perform the Control the Injection Volume for A/F Sensor operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume).
   7. Monitor the voltage outputs of the air fuel ratio sensor and the heated oxygen sensor (AFS Voltage B1 S1 or AFS Voltage B2 S1 and O2S B1 S2 or O2S B2 S2) displayed on the tester.

      HINT:

      • The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%.
      • Each sensor reacts in accordance with increases and decreases in the fuel injection volume.

      Standard

      Tester Display	Injection Volume	Status	Voltage
      AFS Voltage B1 S1 AFS Voltage B2 S1 (Air fuel ratio sensor)	+25%	Rich	Less than 3.1 V
      	-12.5%	Lean	More than 3.4 V
      O2S B1 S2 O2S B2 S2 (Heated oxygen)	+25%	Rich	More than 0.55 V
      	-12.5%	Lean	Less than 0.4 V

      RESULT
      

      Status AFS B1 S1 AFS B2 S1	Status O2S B1 S2 O2S B2 S2	Air Fuel Ratio Condition and Air Fuel Ratio Sensor Condition	Misfire	Suspected Trouble Area	Proceed to
      Lean/Rich	Lean/Rich	Normal	-	-	A
      Lean	Lean	Actual air fuel ratio lean	May occur	PCV valve and hose PCV hose connections Injector blockage Gas leak from exhaust system Air induction system Fuel pressure Mass air flow meter Engine coolant temperature sensor	A
      Rich	Rich	Actual air fuel ratio rich	-	Injector blockage or blockage Gas leak from exhaust system Ignition system Fuel pressure Mass air flow meter Engine coolant temperature sensor
      Lean	Lean/Rich	Air fuel ratio sensor malfunction	-	Air fuel ratio sensor	B
      Rich	Lean/Rich	Air fuel ratio sensor malfunction	-	Air fuel ratio sensor

      Lean: During Control the Injection Volume for A/F Sensor, the air fuel ratio sensor output voltage (AFS) is consistently more than 3.4 V, and the heated oxygen sensor output voltage (O2S) is consistently less than 0.4 V.

      Rich: During Control the Injection Volume for A/F Sensor, the AFS is consistently less than 3.1 V, and the O2S is consistently more than 0.55 V.

      Lean/Rich: During Control the Injection Volume for A/F Sensor of the Active Test, the output voltage of the heated oxygen sensor alternates correctly.

   B --> See step 11

   A: Go to next step

5. READ VALUE USING TECHSTREAM (COOLANT TEMP)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG).
   3. Turn the tester on.
   4. Select the following menu items: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.
   5. Read the Data List twice, when the engine is both cold and warmed up.

      Standard value

      With cold engine: Same as ambient air temperature.

      With warm engine: 80 to 100°C (176 to 212°F).

   NG --> See step 24

   OK: Go to next step

6. INSPECT MASS AIR FLOW METER
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG).
   3. Turn the Techstream on.
   4. Enter the following menus: Powertrain / Engine / Data List / All Data / MAF and Coolant Temp.
   5. Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.
   6. Read MAF with the engine speed at 3000RPM.

      Standard

      Between 10 to 25 g/sec. (shift lever: N; A/C: off).

   NG --> See step 16

   OK: Go to next step

7. CHECK FUEL PRESSURE
   1. Check the fuel pressure, refer to ON-VEHICLE INSPECTION .

   NG --> REPAIR OR REPLACE FUEL SYSTEM

   OK: Go to next step

8. CHECK FOR EXHAUST GAS LEAK
   1. Check for exhaust gas leaks from the exhaust manifold sub-assembly and exhaust pipe.

      OK

      No gas leak.

   NG --> REPAIR OR REPLACE EXHAUST SYSTEM

   OK: Go to next step

9. CHECK SPARK AND IGNITION

   HINT:

   • Refer to the ignition system inspection procedure, refer to ON-VEHICLE INSPECTION .
   • If the spark plugs or ignition system malfunctions, engine misfire may occur. The misfire count can be read using the Techstream. Select the following menu items: Powertrain / Engine and ECT / Data List / All Data / Cylinder #1 Misfire Rate (to Cylinder #6 Misfire Rate)

   NG --> REPAIR OR REPLACE IGNITION SYSTEM

   OK: Go to next step

10. INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME)

    HINT:

    • Refer to the fuel injector inspection procedure, refer to INSPECTION .
    • If the injectors malfunction, engine misfire may occur. The misfire count can be read using the Techstream. Select the following menu items: Powertrain / Engine and ECT / Data List / All Data / Cylinder #1 Misfire Rate (to Cylinder #6 Misfire Rate).

    OK --> See step 15

    NG --> See step 25

11. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)
    1. Disconnect the air fuel ratio sensor connector.

       Fig. 71: Identifying Air Fuel Ratio Sensor Connector
       Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    2. Measure the resistance according to the value(s) in the table below.

       Standard resistance

       Bank 1

       Bank 2

       Tester Connection	Condition	Specified Condition
       1 (HA1A) - 2 (+B)	20°C (68°F)	1.6 to 3.2 ohms
       1 (HA1A) - 4 (A1A-)	Always	10 kohms or higher

       Tester Connection	Condition	Specified Condition
       1 (HA2A) - 2 (+B)	20°C (68°F)	1.6 to 3.2 ohms
       1 (HA2A) - 4 (A2A-)	Always	10 kohms or higher

       TEXT IN ILLUSTRATION
       

       *1	Bank 1
       *2	Bank 2
       *a	Component without harness connected (Air Fuel Ratio Sensor)

    3. Reconnect the air fuel ratio sensor connector.

    NG --> See step 26

    OK: Go to next step

12. CHECK TERMINAL VOLTAGE (POWER SOURCE OF AIR FUEL RATIO SENSOR)
    1. Disconnect the air fuel ratio sensor connector.

       Fig. 72: Identifying Air Fuel Ratio Sensor Connector
       Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    2. Turn the ignition switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

       Standard voltage

       Bank 1

       Bank 2

       Tester Connection	Switch Condition	Specified Condition
       B20-2 (+B) - Body ground	Ignition switch on (IG)	9 to 14 V

       Tester Connection	Switch Condition	Specified Condition
       B19-2 (+B) - Body ground	Ignition switch on (IG)	9 to 14 V

       TEXT IN ILLUSTRATION
       

       *1	Bank 1
       *2	Bank 2
       *a	Front view of wire harness connector (to Air Fuel Ratio Sensor)

    4. Reconnect the air fuel ratio sensor connector.

    NG --> See step 21

    OK: Go to next step

13. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)
    1. Disconnect the air fuel ratio sensor connector.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

       Standard resistance (Check for open)

       Bank 1

       Bank 2

       Tester Connection	Condition	Specified Condition
       B20-1 (HA1A) - B48-17 (HA1A)	Always	Below 1 ohms

       Tester Connection	Condition	Specified Condition
       B19-1 (HA2A) - B48-19 (HA2A)	Always	Below 1 ohms

       Standard resistance (Check for short)

       Bank 1

       Bank 2

       Tester Connection	Condition	Specified Condition
       B20-1 (HA1A) or B48-17 (HA1A) - Body ground	Always	10 kohms or higher

       Tester Connection	Condition	Specified Condition
       B19-1 (HA2A) or B48-19 (HA2A) - Body ground	Always	10 kohms or higher

    4. Reconnect the ECM connector.
    5. Reconnect the air fuel ratio sensor connector.

    NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK: Go to next step

14. REPLACE AIR FUEL RATIO SENSOR
    1. Replace the air fuel ratio sensor, refer to COMPONENTS .

    NEXT: Go to next step

15. PERFORM CONFIRMATION DRIVING PATTERN

    Fig. 73: Identifying Vehicle Speed Driving Pattern
    Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch on (IG).
    3. Turn the tester on.
    4. Clear DTCs, refer to DTC CHECK / CLEAR .
    5. Turn the ignition switch off.
    6. Turn the ignition switch on (IG) and turn the Techstream on.
    7. Start the engine and warm it up.
    8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    9. Enter the following menus: Powertrain / Engine / Trouble Codes.
    10. Read DTCs.

        Result

        Result	Proceed to
        DTC P0171, P0172, P0174 or P0175 is output	A
        DTC is not output	B

    B --> END

    A: Go to next step

16. CHECK HARNESS AND CONNECTOR
    1. Check the connection and terminal contact pressure of connectors and wire harness between the mass air flow meter and ECM See step 5.

       HINT:

       Repair any problems.

    NEXT: Go to next step

17. CHECK WHETHER DTC OUTPUT RECURS
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch on (IG).
    3. Turn the Techstream on.
    4. Clear the DTCs, refer to DTC CHECK / CLEAR .
    5. Turn the ignition switch off.
    6. Turn the ignition switch on (IG) and turn the Techstream on.
    7. Start the engine and warm it up.
    8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
    10. Read DTCs.

        Result

        Result	Proceed to
        DTC P0171, P0172, P0174 or P0175 is output	A
        DTC is not output	B

    B --> END

    A: Go to next step

18. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)
    1. Disconnect the mass air flow meter connector.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

       Standard resistance

       Tester Connection	Condition	Specified Condition
       B10-5 (VG) - B50-14 (VG)	Always	Below 1 ohms
       B10-4 (E2G) - B50-13 (E2G)	Always	Below 1 ohms
       B10-5 (VG) or B50-14 (VG) - Body ground	Always	10 kohms or higher

    NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK: Go to next step

19. REPLACE MASS AIR FLOW METER ASSEMBLY
    1. Replace the mass air flow meter assembly, refer to REMOVAL .

       HINT:

       If the result of the inspection performed step 6 indicated no problem, proceed to the next step without replacing the mass air flow meter assembly.

    NEXT: Go to next step

20. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch on (IG).
    3. Turn the Techstream on.
    4. Clear the DTCs, refer to DTC CHECK / CLEAR .
    5. Turn the ignition switch off.
    6. Turn the ignition switch on (IG) and turn the Techstream on.
    7. Start the engine and warm it up.
    8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
    10. Read DTCs.

        Result

        Result	Proceed to
        DTC is not output	A
        DTC P0171, P0172, P0174 or P0175 is output	B

    B --> See step 27

    A --> END

21. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ENGINE ROOM JUNCTION BLOCK ASSEMBLY)

    NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK: Go to next step

22. INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY (A/F RELAY)
    1. Inspect the A/F relay, refer to INSPECTION .

    NG --> See step 28

    OK --> CHECK ECM POWER SOURCE CIRCUIT

23. GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART
24. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to COMPONENTS
25. REPLACE FUEL INJECTOR ASSEMBLY. Refer to COMPONENTS
26. REPLACE AIR FUEL RATIO SENSOR. Refer to COMPONENTS
27. REPLACE ECM. Refer to COMPONENTS
28. REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY (A/F RELAY). Refer to COMPONENTS

DTC P0230: Fuel Pump Primary Circuit

DESCRIPTION

• This DTC is designed to detect a malfunction in the fuel pump (FUEL PMP) relay circuit. When the system is normal, the battery voltage is applied to FPR terminal of the ECM while the FUEL PMP relay is turned OFF. If the battery voltage is not applied to the FPR terminal while the FUEL PMP relay is OFF, the ECM interprets this as a malfunction. The ECM then illuminates the MIL and sets a DTC.
• The FUEL PMP relay switches the fuel pump speed according to the engine conditions. The fuel pump operates when the ECM receives the starter-operating signal (STA) and crankshaft-rotating signal (NE). The FUEL relay is turned ON while the engine is idling or operating at low load. This causes current to flow through the fuel pump resistor to the fuel pump. The fuel pump then operates at low speed. The FUEL relay is turned OFF while the engine is cranking or operating at high load. The fuel pump then operates at normal speed.

DTC No.	DTC Detection Condition	Trouble Area
P0230	Open or short in FUEL PUMP relay circuit (1 trip detection logic)	Open or short in FUEL PUMP relay circuit FUEL PMP relay ECM

WIRING DIAGRAM

Fig. 74: Identifying Crankshaft Position Sensor Wiring Diagram (1 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 75: Identifying Crankshaft Position Sensor Wiring Diagram (2 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

This troubleshooting procedure is based on the premise that the engine is started. If the engine is not started, proceed to the problem symptoms table, refer to PROBLEM SYMPTOMS TABLE .

INSPECTION PROCEDURE

NOTE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG) and turn the tester on.
   3. Select the following menu items: Powertrain / Engine and ECT / Active Test / Active the Fuel Pump Speed Control.
   4. Check the operation of the relay while operating it using the tester.

      OK

      Operating noise can be heard from the relay.

   NG --> See step 2

   OK --> See step 4

2. INSPECT RELAY (FUEL PMP RELAY)
   1. Remove the FUEL PMP relay from the engine room junction block.

      Fig. 76: Identifying Fuel Pump Relay Terminals
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection	Condition	Specified Condition
      1 - 2	Always	Approximately 111 ohms

   3. Reinstall the FUEL PMP relay.

   NG --> REPLACE RELAY (FUEL PMP RELAY)

   OK: Go to next step

3. CHECK HARNESS AND CONNECTOR (FUEL PMP RELAY - ECM)
   1. Remove the FUEL PMP relay from the engine room relay block.
   2. Disconnect the ECM connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection	Condition	Specified Condition
      FUEL PMP relay terminal 1 - D60-8 (FPR)	Always	Below 1 ohms
      FUEL PMP relay terminal 1 or D60-8 (FPR) - Body Ground	Always	10 kohms or higher

   4. Reconnect the ECM connector.
   5. Reinstall the FUEL PMP relay.

   NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL PMP RELAY - ECM)

   OK --> See step 4

4. REPLACE ECM. Refer to COMPONENTS

DTC P0300: Random / Multiple Cylinder Misfire Detected; DTC P0301: Cylinder 1 Misfire Detected; DTC P0302: Cylinder 2 Misfire Detected; DTC P0303: Cylinder 3 Misfire Detected; DTC P0304: Cylinder 4 Misfire Detected; DTC P0305: Cylinder 5 Misfire Detected; DTC P0306: Cylinder 6 Misfire Detected

DESCRIPTION

Fig. 77: Identifying ECM Communication Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

When the engine misfires, high concentrations of hydrocarbons enter the exhaust gas. High hydrocarbons concentration levels can cause increase in exhaust emission levels. Extremely high concentrations of hydrocarbons can also cause increases in the three-way catalytic converter temperature, which may cause damage to the three-way catalytic converter. To prevent this increase in emissions and to limit the possibility of thermal damage, the ECM monitors the misfire rate. When the temperature of the three-way catalytic converter reaches the point of thermal degradation, the ECM blinks the MIL. To monitor misfires, the ECM uses both the VVT sensor and the crankshaft position sensor. The VVT sensor is used to identify any misfiring cylinders and the crankshaft position sensor is used to measure variations in the crankshaft rotation speed. Misfires are counted when the crankshaft rotation speed variations exceed predetermined thresholds. If the misfire count exceeds the threshold levels, the ECM illuminates the MIL and sets a DTC.

DTC No.	DTC Detection Condition	Trouble Area
P0300	Simultaneous misfiring of several cylinders occurs and one of following conditions below is detected (2 trip detection logic): High temperature misfire occurs in three-way catalytic converter (MIL blinks) Emission deterioration misfire occurs (MIL illuminates)	Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Injector Fuel pressure Mass air flow meter Engine coolant temperature sensor Compression pressure Valve clearance Valve timing PCV valve and hose PCV hose connections Air induction system ECM
P0301 P0302 P0303 P0304 P0305 P0306	Misfiring of specific cylinder occurs and one of following conditions below is detected (2 trip detection logic): High temperature misfire occurs in three-way catalytic converter (MIL blinks) Emission deterioration misfire occurs (MIL illuminates)

When multiple DTCs for misfiring cylinders are set, but DTC P0300 is not set, it indicates that misfires have been detected in different cylinders at different times. DTC P0300 is only set when several misfiring cylinders are detected at the same time.

MONITOR DESCRIPTION

The ECM illuminates the MIL and sets a DTC when either one of the following conditions, which could cause emission deterioration, is detected (2 trip detection logic).

• Within the first 1000 crankshaft revolutions of the engine starting, an excessive misfiring rate (approximately 20 to 50 misfires per 1000 crankshaft revolutions) occurs once.
• An excessive misfiring rate (approximately 20 to 50 misfires per 1000 crankshaft revolutions) occurs a total of 4 times.

The ECM flashes the MIL and sets a DTC when either one of the following conditions, which could cause the three-way catalytic converter damage, is detected (2 trip detection logic).

• At a high engine RPM, a catalyst damage misfire, which monitored every 200 crankshaft revolutions, occurs once.
• At a normal engine RPM, a catalyst damage misfire, which monitored every 200 crankshaft revolutions, occurs 3 times.

HINT:

If a catalyst damage misfire occurs, the ECM informs the driver by flashing the MIL.

Misfire Monitor for Mexico Models

The ECM illuminates the MIL and sets a DTC when either one of the following conditions, which could cause emission deterioration, is detected (2 trip detection logic).

• Within the first 1000 crankshaft revolutions of the engine starting, an excessive misfiring rate (approximately 1000 misfires per 1000 crankshaft revolutions) occurs once.
• An excessive misfiring rate (approximately 500 misfires per 1000 crankshaft revolutions) occurs a total of 4 times.

The ECM flashes the MIL and sets a DTC when the following condition, which could cause the Three-Way Catalytic Converter (TWC) damage, is detected (2 trip detection logic).

• A catalyst damage misfire, which is monitored every 200 crankshaft revolutions, occurs 3 times.

MONITOR STRATEGY

Related DTCs	P0300: Multiple cylinder misfire P0301: Cylinder 1 misfire P0302: Cylinder 2 misfire P0303: Cylinder 3 misfire P0304: Cylinder 4 misfire P0305: Cylinder 5 misfire P0306: Cylinder 6 misfire
Required Sensors/Components (Main)	Injector, Ignition coil and spark plug
Required Sensors/Components (Related)	Crankshaft position, Camshaft position Engine coolant temperature and intake air temperature sensors and Mass air flow meter
Frequency of Operation	Continuous
Duration	1000 to 4000 crankshaft revolutions: Emission related misfire 200 to 600 crankshaft revolutions: Catalyst damaged misfire
MIL Operation	2 driving cycles: (MIL illuminates when misfire detected) MIL flashes immediately: When catalyst damaged misfire occur
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

MISFIRE:

The monitor will run whenever these DTCs are not present	P0016, P0018 (VVT system bank 1, 2 - misalignment) P0017, P0019 (Exhaust VVT system bank 1, 2 - misalignment) P0102, P0103 (MAF meter) P0112, P0113 (IAT sensor) P0115, P0117, P0118 (ECT sensor) P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (TP sensor) P0125 (Insufficient ECT for closed loop) P0327, P0328, P0332, P0333 (Knock sensor) P0335 (CKP sensor) P0351, P0352, P0353, P0354, P0355, P0356 (Igniter) P0500 (Vehicle speed sensor)
Battery voltage	8 V or more
VVT system	Not operated by scan tool
Engine RPM	450 to 6500 RPM
Either of following conditions (a) or (b) met	-
(a) Engine coolant temperature at engine start	More than -7°C (19°F)
(b) Engine coolant temperature	More than 20°C (68°F)
Fuel cut	OFF

MONITOR PERIOD OF EMISSION-RELATED-MISFIRE:

First 1000 revolutions after engine start, or Check Mode	Crankshaft 1000 revolutions
Except above	Crankshaft 1000 revolutions x 4

MONITOR PERIOD OF CATALYST-DAMAGED-MISFIRE (MIL BLINKS):

All of following conditions 1, 2 and 3 met	Crankshaft 200 revolutions
1. Driving cycles	1st
2. Check mode	OFF
3. Engine RPM	Less than 3000 RPM
Except above	Crankshaft 200 revolutions x 3

FOR MEXICO MODELS:

MISFIRE: FOR MEXICO MODELS

The monitor will run whenever these DTCs are not present	P0016, P0018 (VVT system bank 1, 2 - misalignment) P0017, P0019 (Exhaust VVT system bank 1, 2 - misalignment) P0102, P0103 (MAF meter) P0112, P0113 (IAT sensor) P0115, P0117, P0118 (ECT sensor) P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (TP sensor) P0125 (Insufficient ECT for closed loop) P0327, P0328, P0332, P0333 (Knock sensor) P0335 (CKP sensor) P0351, P0352, P0353, P0354, P0355, P0356 (Igniter) P0500 (Vehicle speed sensor)
Battery voltage	8 V or more
VVT system	Not operated by scan tool
Engine RPM	450 to 6500 RPM
Engine coolant temperature	More than 65°C (149°F)
Fuel cut	OFF

MONITOR PERIOD OF EMISSION-RELATED-MISFIRE: FOR MEXICO MODELS

First 1000 revolutions after engine start, or Check mode	Crankshaft 1000 revolutions
Except above	Crankshaft 1000 revolutions x 4

MONITOR PERIOD OF CATALYST-DAMAGED-MISFIRE (MIL BLINKS): FOR MEXICO MODELS

All of following conditions 1, 2 and 3 met	Crankshaft 200 revolutions
1. Driving cycles	1st
2. Check mode	OFF
Except above	Crankshaft 200 revolutions x 3

TYPICAL MALFUNCTION THRESHOLDS

MONITOR PERIOD OF EMISSION-RELATED-MISFIRE:

Misfire rate

1% or more

MONITOR PERIOD OF CATALYST-DAMAGED-MISFIRE (MIL BLINKS):

Number of misfire per 200 revolutions	94 or more (varies with intake air amount and RPM)
Paired cylinder misfire (MIL blinks immediately)	Detected

FOR MEXICO MODELS:

MONITOR PERIOD OF EMISSION-RELATED-MISFIRE: FOR MEXICO MODELS

Misfire rate

26 % or more: for 1st 1000 revolutions 13 % or more: after 1st 1000 revolutions

MONITOR PERIOD OF CATALYST-DAMAGED-MISFIRE (MIL BLINKS): FOR MEXICO MODELS

Number of misfire per 200 revolutions	94 or more (varies with intake air amount and RPM)
Paired cylinder misfire (MIL blinks immediately)	Detected

MONITOR RESULT

Refer to CHECKING MONITOR STATUS, refer to CHECKING MONITOR STATUS .

WIRING DIAGRAM

Wiring diagram of the ignition system.

Fig. 78: Identifying Ignition System Wiring Diagram (1 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 79: Identifying Ignition System Wiring Diagram (2 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

CONFIRMATION DRIVING PATTERN

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG).
3. Turn the Techstream on.
4. Record the DTC(s) and freeze frame data.
5. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
6. Using the Techstream, switch the ECM from normal mode to check mode, refer to CHECK MODE PROCEDURE .
7. Read the misfire counts of each cylinder (cylinder No. 1 to No. 8) with the engine idling. If any misfire count is displayed, skip the following confirmation driving pattern.
8. Drive the vehicle several times with the conditions, such as engine speed and engine load, as shown in Misfire RPM and Misfire Load in the freeze frame data.

   HINT:

   In order to store misfire DTCs, it is necessary to operate the vehicle for the period of time shown in the table below with the engine speed and engine load the same as Misfire RPM and Misfire Load in the freeze frame data.

   Engine Speed	Duration
   Idling	7.0 minutes or more
   1000	4.0 minutes or more
   2000	2.0 minutes or more
   3000	1.5 minutes or more

9. Check whether misfires have occurred by checking DTCs and freeze frame data.

   HINT:

   Do not turn the ignition switch off until the stored DTCs and freeze frame data have been recorded. When the ECM returns to normal mode (default), the stored DTCs, freeze frame data and other data will be cleared.

10. Record the DTCs, freeze frame data and misfire counts.
11. Turn the ignition switch off and wait for at least 30 seconds.
12. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).

INSPECTION PROCEDURE

NOTE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT:

• If any DTCs other than misfire DTCs are output, troubleshoot those DTCs first.
• Bank 1 refers to the bank that includes the No. 1 cylinder*.

  *: The No. 1 cylinder is the cylinder which is farthest from the transmission.

• Bank 2 refers to the bank that does not include the No. 1 cylinder.
• Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
• If the misfire does not recur when the vehicle is brought to the workshop, reproduce the conditions stored in the ECM as freeze frame data.
• If the misfire still cannot be reproduced even though the conditions stored in the ECM as freeze frame data have been reproduced, one of the following factors is considered to be a possible cause of the problem:
  1. There was insufficient fuel volume in the tank.
  2. Improper fuel is used.
  3. The spark plugs have been contaminated.
• After finishing repairs, check the misfire counts of the cylinders (Cylinder #1 Misfire Count to Cylinder #6 Misfire Count).
• Be sure to confirm that no misfiring cylinder DTCs are set again by conducting the confirmation driving pattern after finishing repairs.
• For 6 and 8 cylinder engines, the ECM intentionally does not set the specific misfiring cylinder DTCs at high engine RPM. If misfires occur only in high engine RPM areas, only DTC P0300 is set.

  In the event of DTC P0300 being present, perform the following operations:

  1. Clear the DTC, refer to DTC CHECK / CLEAR .
  2. Start the engine and conduct the confirmation driving pattern.
  3. Read the misfiring rates of each cylinder or DTC(s) using the tester.
  4. Repair the cylinder(s) that has a high misfiring rate or is indicated by the DTC.
  5. After finishing repairs, conduct the confirmation driving pattern again, in order to verify that DTC P0300 is not set.
• When one of Short FT #1, Long FT #1, Short FT #2 or Long FT #2 in the freeze frame data is outside the range of +/-20%, the air fuel ratio may be Rich (-20% or less) or Lean (+20% or more).
• When the Coolant Temp in the freeze frame data is less than 75°C (167°F), the misfire have occurred only while warming up the engine.
• An extremely imbalanced drive wheel which causes body vibration may cause misfire DTCs detection.

PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO MISFIRE CODES)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG).
   3. Turn the tester on.
   4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
   5. Read DTCs.

      HINT:

      Write down the DTCs.

      Result

      Display (DTC Output)	Proceed to
      P0300, P0301, P0302, P0303, P0304, P0305 and/or P0306	A
      P0300, P0301, P0302, P0303, P0304, P0305 and/or P0306 and other DTCs	B

      HINT:

      If any DTCs other than P0300, P0301, P0302, P0303, P0304, P0305 and P0306 are output, troubleshoot those DTCs first.

   B --> See step 37

   A: Go to next step

2. CHECK PCV HOSE CONNECTIONS
   1. Check the PCV hose connection.

      OK

      PCV hose is correctly connected and is not damaged.

   NG --> REPAIR OR REPLACE PCV HOSE

   OK: Go to next step

3. READ VALUE USING TECHSTREAM (MISFIRE RPM AND MISFIRE LOAD)
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG) and turn the tester on.
   3. Enter the following menus: Powertrain / Engine and ECT / Data List / Misfire / Misfire RPM and Misfire Load.
   4. Read and note the Misfire RPM and Misfire Load values.

      HINT:

      The Misfire RPM and Misfire Load values indicate the vehicle conditions under which the misfire occurred.

   NEXT: Go to next step

4. READ VALUE USING TECHSTREAM
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG) and turn the tester on.
   3. Enter the following menus: Powertrain / Engine and ECT / Data List / Catalyst OT MF F/C.
   4. Read the value displayed on the tester.

      Result

      Data List	Tester Display	Proceed to
      Catalyst OT MF F/C	Avail	A
      	Not Avl	B

   B --> See step 6

   A: Go to next step

5. PERFORM ACTIVE TEST USING TECHSTREAM
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG) and turn the tester on.
   3. Enter the following menus: Powertrain / Engine and ECT / Active Test / Prohibit the Catalyst OT Misfire prevent F/C.
   4. Perform the Active Test.

      NOTE:

      When performing the Active Test, make sure the vehicle is stopped and either idling or being revved within 3000 RPM.

   NEXT: Go to next step

6. READ VALUE USING TECHSTREAM
   1. Enter the following menus: Powertrain / Engine and ECT / Data List / Misfire / Cylinder #1 Misfire Count, #2, #3, #4, #5 and #6
   2. Read each value for Cylinder #1 Misfire Count to #6 displayed on the tester. If no misfire counts occur in any cylinders, perform the following procedures:
      1. Start the engine and let it idle.
      2. Move the shift lever to the D position.
      3. Check the Cylinder #1 Misfire Count to #6.
      4. If misfire counts are still not displayed, perform steps (c) and (d).
   3. Drive the vehicle with the Misfire RPM and Misfire Load noted in the "READ VALUE OF THE TECHSTREAM Misfire RPM AND Misfire Load)" procedures above.
   4. Read the Cylinder #1 Misfire Count to #6 or DTCs displayed on the tester.

      Result

      Misfire Count	Proceed to
      Most misfires occur in only 1 or 2 cylinders	A
      3 cylinders or more have equal misfire counts	B

      HINT:

      • If it is difficult to reproduce misfires for each cylinder, check the Data List item called Misfire Margin. Try to find vehicle driving conditions that lower the Misfire Margin value. Values above 30% are considered normal.
      • If the freeze frame data's record of the engine coolant temperature is below 75°C (167°F), the misfire may be detected only when the engine is cold.
      • If the freeze frame data's record of the Engine Run Time is below 120 seconds, the misfire may be detected immediately after the engine is started.

   B --> See step 18

   A: Go to next step

7. CHECK SPARK PLUG

   Fig. 80: Identifying Spark Plug
   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   1. Remove the ignition coil and the spark plug of the misfiring cylinder.
   2. Measure the spark plug electrode gap.

      Maximum gap

      1.4 mm (0.0551 in.)

   3. Check the electrode for carbon deposits.

      RECOMMENDED SPARK PLUG:
      

      Manufacturer	Product
      DENSO	FK20HR11

      NOTE:

      If the electrode gap is larger than standard, replace the spark plug. Do not adjust the electrode gap.

   NG --> See step 38

   OK: Go to next step

8. CHECK FOR SPARKS AND IGNITION
   1. Disconnect the injector connectors to prevent the engine from starting.

      WARNING:

      Always disconnect all injector connectors.

      NOTE:

      Do not crank the engine for more than 2 seconds.

   2. Remove the ignition coil from the cylinder head.
   3. Install the spark plug onto the ignition coil.
   4. Attach the spark plug assembly to the cylinder head.
   5. Crank the engine for less than 2 seconds and check the spark.

      OK

      Sparks jump across electrode gap.

   6. Install the ignition coil.
   7. Reconnect the injector connectors.

   NG --> See step 34

   OK: Go to next step

9. CHECK CYLINDER COMPRESSION PRESSURE
   1. Measure the cylinder compression pressure of the misfiring cylinder, refer to ON-VEHICLE INSPECTION .

   NG --> CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

   OK: Go to next step

10. CHECK HARNESS AND CONNECTOR (INJECTOR OF MISFIRING CYLINDER POWER SOURCE)
    1. Disconnect the injector connector (of the misfiring cylinder).

       Fig. 81: Identifying Injector Connector
       Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    2. Measure the voltage according to the value(s) in the table below.

       Standard voltage

       Cylinder	Tester Connection	Switch Condition	Specified Condition
       No. 1	B13-2 - Body ground	Ignition switch on (IG)	11 to 14 V
       No. 2	B14-2 - Body ground	Ignition switch on (IG)	11 to 14 V
       No. 3	B15-2 - Body ground	Ignition switch on (IG)	11 to 14 V
       No. 4	B16-2 - Body ground	Ignition switch on (IG)	11 to 14 V
       No. 5	B17-2 - Body ground	Ignition switch on (IG)	11 to 14 V
       No. 6	B18-2 - Body ground	Ignition switch on (IG)	11 to 14 V

       TEXT IN ILLUSTRATION
       

       *a	Front view of wire harness connector (to Fuel Injector)

    NG --> GO TO FUEL INJECTOR CIRCUIT

    OK: Go to next step

11. CHECK HARNESS AND CONNECTOR (ECM - INJECTOR OF MISFIRING)
    1. Turn the ignition switch off.
    2. Measure the resistance according to the value(s) in the table below.

       Standard resistance

       Check for open

       Check for short

       Cylinder	Tester Connection	Condition	Specified Condition
       No. 1	B13-1 - B48-6 (#10)	Always	Below 1 ohms
       No. 2	B14-1 - B48-1 (#20)	Always	Below 1 ohms
       No. 3	B15-1 - B48-7 (#30)	Always	Below 1 ohms
       No. 4	B16-1 - B48-2 (#40)	Always	Below 1 ohms
       No. 5	B17-1 - B48-8 (#50)	Always	Below 1 ohms
       No. 6	B18-1 - B48-3 (#60)	Always	Below 1 ohms

       Cylinder	Tester Connection	Condition	Specified Condition
       No. 1	B13-1 - Body ground	Always	10 kohms or higher
       No. 2	B14-1 - Body ground	Always	10 kohms or higher
       No. 3	B15-1 - Body ground	Always	10 kohms or higher
       No. 4	B16-1 - Body ground	Always	10 kohms or higher
       No. 5	B17-1 - Body ground	Always	10 kohms or higher
       No. 6	B18-1 - Body ground	Always	10 kohms or higher

    NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR - ECM)

    OK: Go to next step

12. CHECK FUEL INJECTOR OF MISFIRING CYLINDER
    1. Check the injector resistance, refer to INSPECTION .
    2. Check the injector injection (whether fuel volume is high or low, and whether injection pattern is poor), refer to INSPECTION .

    NG --> See step 39

    OK: Go to next step

13. CHECK AIR INDUCTION SYSTEM
    1. Check the air induction system for vacuum leakage, refer to ON-VEHICLE INSPECTION .

       OK

       No leakage from air induction system.

    NG --> REPAIR OR REPLACE AIR INDUCTION SYSTEM

    OK: Go to next step

14. CHECK FUEL PRESSURE
    1. Check the fuel pressure, refer to ON-VEHICLE INSPECTION .

    NG --> See step 36

    OK: Go to next step

15. READ VALUE USING TECHSTREAM (COOLANT TEMP) See step 1

    NG --> See step 40

    OK: Go to next step

16. INSPECT MASS AIR FLOW METER
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Data List / All Data / MAF and Coolant Temp.
    5. Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.
    6. Read MAF with the engine speed at 3000RPM.

       Standard

       Between 10 to 25 g/sec. (shift lever: N; A/C: off).

    NG --> See step 29

    OK: Go to next step

17. CHECK VALVE TIMING See step 4

    NG --> ADJUST VALVE TIMING

    OK: Go to next step

18. CHECK AIR INDUCTION SYSTEM
    1. Check the air induction system for vacuum leakage, refer to ON-VEHICLE INSPECTION .

       OK

       No leakage from air induction system.

    NG --> REPAIR OR REPLACE AIR INDUCTION SYSTEM

    OK: Go to next step

19. CHECK FUEL PRESSURE
    1. Check the fuel pressure, refer to ON-VEHICLE INSPECTION .

    NG --> See step 36

    OK: Go to next step

20. READ VALUE USING TECHSTREAM (COOLANT TEMP) See step 1

    NG --> See step 40

    OK: Go to next step

21. INSPECT MASS AIR FLOW METER
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Data List / All Data / MAF and Coolant Temp.
    5. Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.
    6. Read MAF with the engine speed at 3000RPM.

       Standard

       Between 10 to 25 g/sec. (shift lever: N; A/C: off).

    NG --> See step 29

    OK: Go to next step

22. CHECK VALVE TIMING See step 4

    NG --> ADJUST VALVE TIMING

    OK: Go to next step

23. CHECK SPARK PLUG

    Fig. 82: Identifying Spark Plug
    Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    1. Remove the ignition coil and the spark plug of the misfiring cylinder.
    2. Measure the spark plug electrode gap.

       Maximum gap

       1.4 mm (0.0551 in.)

    3. Check the electrode for carbon deposits.

       RECOMMENDED SPARK PLUG:
       

       Manufacturer	Product
       DENSO	FK20HR11

       NOTE:

       If the electrode gap is larger than standard, replace the spark plug. Do not adjust the electrode gap.

    NG --> See step 38

    OK: Go to next step

24. CHECK FOR SPARKS AND IGNITION
    1. Disconnect the injector connectors to prevent the engine from starting.

       WARNING:

       Always disconnect all injector connectors.

       NOTE:

       Do not crank the engine for more than 2 seconds.

    2. Remove the ignition coil from the cylinder head.
    3. Install the spark plug onto the ignition coil.
    4. Attach the spark plug assembly to the cylinder head.
    5. Crank the engine for less than 2 seconds and check the spark.

       OK

       Sparks jump across electrode gap.

    6. Install the ignition coil.
    7. Reconnect the injector connectors.

    NG --> See step 34

    OK: Go to next step

25. CHECK CYLINDER COMPRESSION PRESSURE
    1. Measure the cylinder compression pressure of the misfiring cylinder, refer to ON-VEHICLE INSPECTION .

    NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR - ECM)

    OK: Go to next step

26. CHECK HARNESS AND CONNECTOR (INJECTOR OF MISFIRING CYLINDER POWER SOURCE)
    1. Disconnect the injector connector (of the misfiring cylinder).

       Fig. 83: Identifying Injector Connector
       Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    2. Measure the voltage according to the value(s) in the table below.

       Standard voltage

       Cylinder	Tester Connection	Switch Condition	Specified Condition
       No. 1	B13-2 - Body ground	Ignition switch on (IG)	11 to 14 V
       No. 2	B14-2 - Body ground	Ignition switch on (IG)	11 to 14 V
       No. 3	B15-2 - Body ground	Ignition switch on (IG)	11 to 14 V
       No. 4	B16-2 - Body ground	Ignition switch on (IG)	11 to 14 V
       No. 5	B17-2 - Body ground	Ignition switch on (IG)	11 to 14 V
       No. 6	B18-2 - Body ground	Ignition switch on (IG)	11 to 14 V

       TEXT IN ILLUSTRATION
       

       *a	Front view of wire harness connector (to Fuel Injector)

    NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (INJ NO. 2 FUSE - INJECTOR)

    OK: Go to next step

27. CHECK HARNESS AND CONNECTOR (ECM - INJECTOR OF MISFIRING)
    1. Turn the ignition switch off.
    2. Measure the resistance according to the value(s) in the table below.

       Standard resistance

       Check for open

       Check for short

       Cylinder	Tester Connection	Condition	Specified Condition
       No. 1	B13-1 - B48-6 (#10)	Always	Below 1 ohms
       No. 2	B14-1 - B48-1 (#20)	Always	Below 1 ohms
       No. 3	B15-1 - B48-7 (#30)	Always	Below 1 ohms
       No. 4	B16-1 - B48-2 (#40)	Always	Below 1 ohms
       No. 5	B17-1 - B48-8 (#50)	Always	Below 1 ohms
       No. 6	B18-1 - B48-3 (#60)	Always	Below 1 ohms

       Cylinder	Tester Connection	Condition	Specified Condition
       No. 1	B13-1 - Body ground	Always	10 kohms or higher
       No. 2	B14-1 - Body ground	Always	10 kohms or higher
       No. 3	B15-1 - Body ground	Always	10 kohms or higher
       No. 4	B16-1 - Body ground	Always	10 kohms or higher
       No. 5	B17-1 - Body ground	Always	10 kohms or higher
       No. 6	B18-1 - Body ground	Always	10 kohms or higher

    NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR - ECM)

    OK: Go to next step

28. CHECK FUEL INJECTOR OF MISFIRING CYLINDER
    1. Check the injector resistance, refer to INSPECTION .
    2. Check the injector injection (whether fuel volume is high or low, and whether injection pattern is poor), refer to ON-VEHICLE INSPECTION - Step 2 .

    NG --> See step 39

    OK --> See step 41

29. CHECK HARNESS AND CONNECTOR
    1. Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter and ECM See step 3.

       HINT:

       Repair any problems.

    NEXT: Go to next step

30. CHECK WHETHER DTC OUTPUT RECURS
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch on (IG).
    3. Turn the Techstream on.
    4. Clear the DTCs, refer to DTC CHECK / CLEAR .
    5. Turn the ignition switch off.
    6. Turn the ignition switch on (IG) and turn the Techstream on.
    7. Start the engine and warm it up.
    8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
    10. Input the DTC: P0300, P0301, P0302, P0303, P0304, P0305 or P0306.
    11. Check the DTC judgment result.

        RESULT
        

        Display (DTC Output)	Proceed to
        ABNORMAL (P0300, P0301, P0302, P0303, P0304, P0305 or P0306 output)	A
        NORMAL (No DTC output)	B

    B --> END

    A: Go to next step

31. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)
    1. Disconnect the mass air flow meter connector.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

       Standard Resistance

       Tester Connection	Condition	Specified Condition
       B10-5 (VG) - B50-14 (VG)	Always	Below 1 ohms
       B10-4 (E2G) - B50-13 (E2G)	Always	Below 1 ohms
       B10-5 (VG) or B50-14 (VG) - Body ground	Always	10 kohms or higher

    NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK: Go to next step

32. REPLACE MASS AIR FLOW METER
    1. Replace the mass air flow meter assembly, refer to REMOVAL .

       HINT:

       If the results of the inspections performed in steps 16 and 21 indicated no problem, proceed to the next step without replacing the mass air flow meter assembly.

    NEXT: Go to next step

33. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch on (IG).
    3. Turn the Techstream on.
    4. Clear the DTCs, refer to DTC CHECK / CLEAR .
    5. Turn the ignition switch off.
    6. Turn the ignition switch on (IG) and turn the Techstream on.
    7. Start the engine and warm it up.
    8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
    10. Input the DTC: P0300, P0301, P0302, P0303, P0304, P0305 or P0306.
    11. Check the DTC judgment result.

        RESULT
        

        Display (DTC Output)	Proceed to
        NORMAL (No DTC output)	A
        ABNORMAL (P0300, P0301, P0302, P0303, P0304, P0305 or P0306 output)	B

    B --> See step 41

    A --> END

34. CHANGE TO NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER
    1. Change the installed spark plug to a spark plug that functions normally.
    2. Perform a spark test.

       WARNING:

       Always disconnect all injector connectors.

       NOTE:

       Do not crank the engine for more than 2 seconds.

       1. Install the spark plug to the ignition coil and connect the ignition coil connector.
       2. Disconnect the injector connectors.
       3. Ground the spark plug.
       4. Check if sparks occur while the engine is being cranked.

          OK

          Sparks jump across electrode gap.

    NG --> See step 35

    OK --> See step 38

35. CHANGE TO NORMAL IGNITION COIL ASSEMBLY AND CHECK SPARK OF MISFIRING CYLINDER
    1. Change the ignition coil assembly to an ignition coil assembly that functions normally.
    2. Perform a spark test.

       WARNING:

       Always disconnect all fuel injector connectors.

       NOTE:

       Do not crank the engine for more than 2 seconds.

       1. Install the spark plug to the ignition coil and connect the ignition coil connector.
       2. Disconnect the fuel injector connectors.
       3. Ground the spark plug.
       4. Check if sparks occur while the engine is being cranked.

          OK

          Sparks jump across electrode gap.

    NG --> See step 41

    OK --> See step 42

36. CHECK FUEL LINE
    1. Check the fuel lines for leaks or blockage.

    NG --> REPAIR OR REPLACE FUEL LINE

    OK --> REPLACE FUEL PUMP

37. GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART
38. REPLACE SPARK PLUG. Refer to COMPONENTS
39. REPLACE FUEL INJECTOR ASSEMBLY. Refer to COMPONENTS
40. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to COMPONENTS
41. REPLACE ECM. Refer to COMPONENTS
42. REPLACE IGNITION COIL ASSEMBLY. Refer to COMPONENTS

DTC P0327: Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor); DTC P0328: Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor); DTC P0332: Knock Sensor 2 Circuit Low Input (Bank 2); DTC P0333: Knock Sensor 2 Circuit High Input (Bank 2)

DESCRIPTION

A flat type knock sensor (non-resonant type) has a structure that can detect vibrations over a wide band of frequencies: between approximately 6 kHz and 15 kHz.

Knock sensors are fitted onto the engine block to detect engine knocking.

The knock sensor contains a piezoelectric element which generates a voltage when the engine block vibrates due to knocking. Any occurrence of engine knocking can be suppressed by delaying the ignition timing.

DTC No.	DTC Detection Condition	Trouble Area
P0327 P0332	Output voltage of knock sensor 1 or 2 is less than 0.5 V (1 trip detection logic)	Short in knock sensor 1 or 2 circuit Knock sensor 1 or 2 ECM
P0328 P0333	Output voltage of knock sensor 1 or 2 is more than 4.5 V (1 trip detection logic)	Open in knock sensor 1 or 2 circuit Knock sensor 1 or 2 ECM

HINT:

When any of DTCs P0327, P0328, P0332 and P0333 are set, the ECM enters fail-safe mode. During fail- safe mode, the ignition timing is delayed to its maximum retardation. Fail-safe mode continues until the ignition switch is turned off.

Reference: Inspection using an oscilloscope

Fig. 84: Knock Sensor Signal Waveform Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

The correct waveform is as shown.

Item	Content
Terminals	KNK1 - EKNK or KNK2 - EKN2
Equipment Settings	0.01 to 10 V/DIV., 0.01 to 10 ms./DIV.
Conditions	Keep engine speed at 4000 RPM with warm engine

MONITOR DESCRIPTION

The knock sensor, located on the cylinder block, detects spark knock. When a spark knock occurs, the piezoelectric element of the sensor vibrates. When the ECM detects a voltage in this frequency range, it retards the ignition timing to suppress the spark knock.

The ECM also senses background engine noise with the knock sensor and uses this noise to check for faults in the sensor. If the knock sensor signal level is too low for more than 10 seconds, or if the knock sensor output voltage is outside the normal range, the ECM interprets this as a fault in the knock sensor and sets a DTC.

MONITOR STRATEGY

Related DTCs	P0327: Knock sensor (Bank 1) open/short (Low voltage) P0328: Knock sensor (Bank 1) open/short (High voltage) P0332: Knock sensor (Bank 2) open/short (Low voltage) P0333: Knock sensor (Bank 2) open/short (High voltage)
Required Sensors / Components (Main)	Knock sensor (Bank 1 and 2)
Required Sensors / Components (Related)	-
Frequency of Operation	Continuous
Duration	1 second
MIL Operation	Immediate
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever these DTCs are not present	None
Battery voltage	10.5 V or more
Time after engine start	5 seconds or more
Ignition switch	ON (IG)
Starter	OFF

TYPICAL MALFUNCTION THRESHOLDS

KNOCK SENSOR RANGE CHECK (LOW VOLTAGE) P0327 AND P0332:

Knock sensor voltage

Less than 0.5 V

KNOCK SENSOR RANGE CHECK (HIGH VOLTAGE) P0328 AND P0333:

Knock sensor voltage

More than 4.5 V

WIRING DIAGRAM

Fig. 85: Identifying Knock Sensor Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

CONFIRMATION DRIVING PATTERN

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn the Techstream on.
3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch on (IG) and turn the Techstream on.
6. Start the engine and wait 5 minutes.
7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
8. Read the pending DTCs.

   HINT:

   • If a pending DTC is output, the system is malfunctioning.
   • If a pending DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
10. Input the DTC: P0327, P0328, P032C, P032D, P0332, P0333, P033C or P033D.
11. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or UNKNOWN, idle the engine for 5 minutes and check the DTC judgment result again.
12. If no pending DTC is output, perform a universal trip and check for permanent DTCs, refer to DTC CHECK / CLEAR .

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

HINT:

• DTCs P0327 and P0328 are for the bank 1 knock sensor circuit.
• DTCs P0332 and P0333 are for the bank 2 knock sensor circuit.
• Bank 1 refers to the bank that includes the No. 1 cylinder*.

  *: The No. 1 cylinder is the cylinder which is farthest from the transmission.

• Bank 2 refers to the bank that does not include the No. 1 cylinder.
• Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. READ VALUE USING DTC OUTPUT (CHECK KNOCK SENSOR CIRCUIT)
   1. Disconnect the Bd1 connector.

      Fig. 86: Identifying BD1 Connector
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Using lead wires, connect the connectors as follows.

      Male Connector - Female Connector
      Terminal 2 - Terminal 4
      Terminal 1 - Terminal 3
      Terminal 4 - Terminal 2
      Terminal 3 - Terminal 1

   3. Warm up the engine.
   4. Run the engine at 3000 RPM for 10 seconds or more.
   5. Connect the Techstream to the DLC3.
   6. Turn the ignition switch on (IG) and turn the Techstream on.
   7. Select the following menu items: Powertrain / Engine and ECT / Trouble Code.
   8. Read the DTCs.

      Result

      Display	Proceed to
      DTCs that are same as when vehicle brought in P0327, P0328 --> P0327, P0328 or P0332, P0333 --> P0332, P0333	A
      DTCs that are different from when vehicle brought in P0327, P0328 --> P0332, P0333 or P0332, P0333 --> P0327, P0328	B

      TEXT IN ILLUSTRATION
      

      *1	Knock Sensor
      *2	ECM
      *3	Male Connector
      *4	Female Connector
      *a	Front view of wire harness connector (to Knock Sensor)

   9. Reconnect the Bd1 connector.

   B --> See step 4

   A: Go to next step

2. CHECK HARNESS OR CONNECTOR (Bd1 CONNECTOR - ECM)
   1. Disconnect the Bd1 connector.
   2. Disconnect the ECM connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Check for open

      Check for short

      Tester Connection	Condition	Specified Condition
      Bd1 female connector 2 - B50-11 (KNK1)	Always	Below 1 ohms
      Bd1 female connector 1 - B50-12 (EKNK)	Always	Below 1 ohms
      Bd1 female connector 4 - B50-5 (KNK2)	Always	Below 1 ohms
      Bd1 female connector 3 - B50-6 (EKN2)	Always	Below 1 ohms

      Tester Connection	Condition	Specified Condition
      Bd1 female connector 2 or B50-11 (KNK1) - Body ground	Always	10 kohms or higher
      Bd1 female connector 1 or B50-12 (EKNK) - Body ground	Always	10 kohms or higher
      Bd1 female connector 4 or B50-5 (KNK2) - Body ground	Always	10 kohms or higher
      Bd1 female connector 3 or B50-6 (EKN2) - Body ground	Always	10 kohms or higher

   4. Reconnect the Bd1 connector.
   5. Reconnect the ECM connector.

   NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (Bd1 CONNECTOR - ECM)

   OK: Go to next step

3. INSPECT ECM
   1. Turn the ignition switch on (IG).

      Fig. 87: Identifying ECM
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection	Switch Condition	Specified Condition
      B50-11 (KNK1) - B50-12 (EKNK)	Ignition switch on (IG)	4.5 to 5.5 V
      B50-5 (KNK2) - B50-6 (EKN2)	Ignition switch on (IG)	4.5 to 5.5 V

      TEXT IN ILLUSTRATION
      

      *a	Component with harness connected (ECM)

   3. Reconnect the ECM connector.

      NOTE:

      Fault may be intermittent. Check the wire harness and connectors carefully and retest.

   NG --> See step 8

   OK --> See step 6

4. INSPECT KNOCK SENSOR
   1. Disconnect the Bd1 connector.

      Fig. 88: Identifying BD1 Connector
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection	Condition	Specified Condition
      Bd1 male connector 1 - 2	20 °C(68°F)	120 to 280 kohms
      Bd1 male connector 3 - 4	20 °C(68°F)	120 to 280 kohms

      TEXT IN ILLUSTRATION
      

      *a	Front view of wire harness connector (to Male Connector)

   3. Reconnect the Bd1 connector.

   NG --> See step 5

   OK --> See step 6

5. CHECK HARNESS AND CONNECTOR (Ba1 CONNECTOR - KNOCK SENSOR)

   HINT:

   • If DTC P0327 or P0328 has changed to P0332 or P0333, check the knock sensor circuit on the right bank side.
   • If DTC P0332 or P0333 has changed to P0327 or P0328, check the knock sensor circuit on the left bank side.
   1. Disconnect the Bd1 connector.
   2. Disconnect the knock sensor connectors.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Check for open

      Check for short

      Tester Connection	Condition	Specified Condition
      Bd1 male connector 2 - d2-2	Always	Below 1 ohms
      Bd1 male connector 1 - d2-1	Always	Below 1 ohms
      Bd1 male connector 4 - d1-2	Always	Below 1 ohms
      Bd1 male connector 3 - d1-1	Always	Below 1 ohms

      Tester Connection	Condition	Specified Condition
      Bd1 male connector 2 or d2-2 - Body ground	Always	10 kohms or higher
      Bd1 male connector 1 or d2-1 - Body ground	Always	10 kohms or higher
      Bd1 male connector 4 or d1-2 - Body ground	Always	10 kohms or higher
      Bd1 male connector 3 or d1-1 - Body ground	Always	10 kohms or higher

   4. Reconnect the Bd1 connector.
   5. Reconnect the knock sensor connectors.

   NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (Ba1 CONNECTOR - KNOCK SENSOR)

   OK --> See step 7

6. CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS
7. REPLACE KNOCK SENSOR. Refer to COMPONENTS
8. REPLACE ECM. Refer to COMPONENTS

DTC P0335: Crankshaft Position Sensor "A" Circuit; DTC P0339: Crankshaft Position Sensor "A" Circuit Intermittent

DESCRIPTION

The crankshaft position sensor system consists of a crankshaft position sensor plate and a pickup coil. The sensor plate has 34 teeth and is installed on the crankshaft. The pickup coil is made of an iron core and a magnet.

The sensor plate rotates as each tooth passes through the pickup coil, and a pulse signal is created. The pickup coil generates 34 signals per engine revolution. Based on these signals, the ECM calculates the crankshaft position and engine RPM. Using these calculations, the fuel injection time and ignition timing are controlled.

DTC No.	DTC Detection Condition	Trouble Area
P0335	No crankshaft position sensor signal to ECM while cranking (1 trip detection logic) No crankshaft position sensor signal to ECM at engine speed of 600 RPM or more (1 trip detection logic) Missing crankshaft position sensor signal despite VVT sensor signal inputs normal after engine cranked (1 trip detection logic)	Open or short in crankshaft position sensor circuit Crankshaft position sensor Sensor plate (crankshaft position sensor plate) ECM
P0339	Under conditions (a), (b) and (c), no crankshaft position sensor signal to ECM for 0.05 seconds or more (1 trip detection logic): (a) Engine speed 1000 RPM or more (b) Starter signal OFF (c) 3 seconds or more have lapsed since starter signal switched from ON to OFF	Open or short in crankshaft position sensor circuit Crankshaft position sensor Sensor plate (crankshaft position sensor plate) ECM

Reference: Inspection using an oscilloscope

Fig. 89: Identifying VV1, VV2 & NE Signal Waveform
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

HINT:

• The correct waveform is shown in the illustration.
• VV1+ and VV2+ stand for the VVT sensor signal, and NE+ stands for the crankshaft position sensor signal.

  Item	Content
  Terminals	VV1+ - VV1- VV2+ - VV2- NE+ - NE-
  Equipment Settings	5 V/DIV., 20 ms./DIV.
  Conditions	Cranking or idling

MONITOR DESCRIPTION

If there is no signal from the crankshaft position sensor despite the engine revolving, the ECM interprets this as a malfunction of the sensor.

If the malfunction is not repaired successfully, a DTC is set 10 seconds after the engine is next started.

MONITOR STRATEGY

Related DTCs	P0335: Crankshaft position sensor range check/rationality P0335: Crankshaft position sensor verify pulse input
Required Sensors / Components (Main)	Crankshaft position sensor
Required Sensors / Components (Related)	-
Frequency of Operation	Continuous
Duration	4.7 seconds: Verify pulse input 0.016 seconds: Range check/rationality
MIL Operation	Immediate
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

ALL:

The monitor will run whenever these DTCs are not present

None

P0335: CRANKSHAFT POSITION SENSOR RANGE CHECK/RATIONALITY

Time after starter OFF to ON	3 seconds or more
Battery voltage	7 V or more
Number of VVT sensor signal pulse	6 times
Camshaft position sensor circuit fail (P0340, P0342, P0343)	Not detected
Minimum battery voltage while starter ON	Less than 11 V

P0335: CRANKSHAFT POSITION SENSOR VERIFY PULSE INPUT (CASE 1)

Engine speed	Less than 600 RPM
Starter	OFF
Time after starter from ON to OFF	3 seconds or more

P0335: CRANKSHAFT POSITION SENSOR VERIFY PULSE INPUT (CASE 2)

Starter	ON
Minimum battery voltage while starter ON	Less than 11 V

TYPICAL MALFUNCTION THRESHOLDS

CRANKSHAFT POSITION SENSOR RANGE CHECK/RATIONALITY

Number of crankshaft position sensor signal pulse

Less than 132, or 174 or more

CRANKSHAFT POSITION SENSOR VERIFY PULSE INPUT

Crankshaft position sensor signal

No signal

COMPONENT OPERATING RANGE

Crankshaft position sensor

Crankshaft position sensor output voltage fluctuates while crankshaft is revolving 34 crankshaft position sensor signals per crankshaft revolution

WIRING DIAGRAM

Fig. 90: Identifying Sensor For Intake Camshaft Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

CONFIRMATION DRIVING PATTERN

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn the Techstream on.
3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch on (IG) and turn the Techstream on.
6. Start the engine.
7. Idle the engine for 20 seconds or more [A].
8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].
9. Read the pending DTCs.

   HINT:

   • If a pending DTC is output, the system is malfunctioning.
   • If a pending DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
11. Input the DTC: P0335, P0337 or P0338.
12. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [A] through [B] again.
13. If no pending DTC is output, perform a universal trip and check for permanent DTCs, refer to DTC CHECK / CLEAR .

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

HINT:

• If no problem is found by this diagnostic troubleshooting procedure, check for problems by referring to the engine mechanical service information.
• The engine speed can be checked by using the Techstream. To perform the check, follow the procedures below:
  1. Connect the Techstream to the DLC3.
  2. Start the engine.
  3. Turn the Techstream on.
  4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Engine Speed.
  • The engine speed may be indicated as zero despite the engine running normally. This is caused by a lack of NE signals from the crankshaft position sensor. Alternatively, the engine speed may be indicated as lower than the actual engine speed if the crankshaft position sensor output voltage is insufficient.
  • Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. INSPECT CRANKSHAFT POSITION SENSOR (RESISTANCE)
   1. Disconnect the crankshaft position sensor connector.

      Fig. 91: Identifying Crankshaft Position Sensor Connector
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection	Condition	Specified Condition
      1 - 2	Cold	1630 to 2740 ohms
      1 - 2	Hot	2065 to 3225 ohms

      TEXT IN ILLUSTRATION
      

      *a	Component without harness connected (Crankshaft Position Sensor)

      HINT:

      Terms "cold" and "hot" refer to the temperature of the coils. "Cold" means approximately -10 to 50°C (14 to 122°F). "Hot" means approximately 50 to 100°C (122 to 212°F).

   3. Reconnect the crankshaft position sensor connector.

   NG --> See step 6

   OK: Go to next step

2. CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)
   1. Disconnect the crankshaft position sensor connector.
   2. Disconnect the ECM connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Check for open

      Check for short

      Tester Connection	Condition	Specified Condition
      B21-1 - B51-6 (NE+)	Always	Below 1 ohms
      B21-2 - B51-5 (NE-)	Always	Below 1 ohms

      Tester Connection	Condition	Specified Condition
      B21-1 or B51-6 (NE+) - Body ground	Always	10 kohms or higher
      B21-2 or B51-5 (NE-) - Body ground	Always	10 kohms or higher

   4. Reconnect the ECM connector.
   5. Reconnect the crankshaft position sensor connector.

   NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

   OK: Go to next step

3. CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)
   1. Check the crankshaft position sensor installation condition.

      Fig. 92: Checking CKP Sensor Installation
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      OK

      Sensor is installed correctly.

   NG --> See step 7

   OK: Go to next step

4. CHECK CRANKSHAFT POSITION SENSOR PLATE (TEETH OF SENSOR PLATE)
   1. Remove the crankshaft position sensor plate, refer to DISASSEMBLY .
   2. Check the teeth of the sensor plate.

      OK

      Sensor plate does not have any cracks or deformation.

   3. Reinstall the crankshaft position sensor plate, refer to REASSEMBLY .

   NG --> See step 8

   OK --> See step 5

5. REPLACE ECM. Refer to COMPONENTS
6. REPLACE CRANKSHAFT POSITION SENSOR. Refer to COMPONENTS
7. REPAIR OR REPLACE CRANKSHAFT POSITION SENSOR. Refer to COMPONENTS
8. REPLACE CRANKSHAFT POSITION SENSOR PLATE. Refer to COMPONENTS

DTC P0340: Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor); DTC P0342: Camshaft Position Sensor "A" Circuit Low Input (Bank 1 or Single Sensor); DTC P0343: Camshaft Position Sensor "A" Circuit High Input (Bank 1 or Single Sensor); DTC P0345: Camshaft Position Sensor "A" Circuit (Bank 2); DTC P0347: Camshaft Position Sensor "A" Circuit Low Input (Bank 2); DTC P0348: Camshaft Position Sensor "A" Circuit High Input (Bank 2)

DESCRIPTION

The intake camshaft's VVT sensor (G signal) consists of a magnet and magnetic resistance element.

The VVT camshaft drive gear has a sensor plate with 3 teeth on its outer circumference. When the gear rotates, changes occur in the air gaps between the sensor plate and magnetic resistance element, which affects the magnetic field. As a result, the resistance of the magnetic resistance element material fluctuates. The VVT sensor converts the gear rotation data to pulse signals, uses the pulse signals to determine the camshaft angle, and sends it to the ECM.

The crankshaft angle sensor plate has 34 teeth. The pickup coil generates 34 signals for each engine revolution. Based on combination of the G signal and NE signal, the ECM detects the crankshaft angle. Then the ECM uses this data to control fuel injection time and injection timing. Also, based on the NE signal, the ECM detects the engine speed.

DTC No.	DTC Detection Condition	Trouble Area
P0340	Either of the following condition is met: Missing VVT sensor signal despite crankshaft position sensor inputs normal at engine speed of 600 RPM or more (1 trip detection logic) No VVT sensor signal to ECM during cranking (2 trip detection logic)	Open or short in VVT sensor circuit for intake camshaft VVT sensor for intake camshaft Camshaft timing gear for intake camshaft Jumped tooth of timing chain for intake camshaft ECM
P0342 P0347	Output voltage of VVT sensor is 0.3 V or less for 4 seconds (1 trip detection logic)	Open or short in VVT sensor circuit for intake camshaft VVT sensor for intake camshaft Camshaft timing gear for intake camshaft Jumped tooth of timing chain for intake camshaft ECM
P0343 P0348	Output voltage of VVT sensor is 4.7 V or more for 4 seconds (1 trip detection logic)	Open or short in VVT sensor circuit for intake camshaft VVT sensor for intake camshaft Camshaft timing gear for intake camshaft Jumped tooth of timing chain for intake camshaft ECM
P0345	No VVT sensor signal at engine speed of 600 RPM or more (1 trip detection logic)	Open or short in VVT sensor circuit for intake camshaft VVT sensor for intake camshaft Camshaft timing gear for intake camshaft Jumped tooth of timing chain for intake camshaft ECM

Reference: Inspection using an oscilloscope

Fig. 93: Identifying VV1, VV2 & NE Signal Waveforms
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

HINT:

• The correct waveform is shown in the illustration.
• VV1+ and VV2+ stand for the VVT sensor signal, and NE+ stands for the crankshaft position sensor signal.

  Item	Content
  Terminals	NE+ - NE- VV1+ - VV1- VV2+ - VV2-
  Equipment Settings	5 V/DIV., 20 ms./DIV.
  Conditions	Idling

MONITOR DESCRIPTION

If no signal is transmitted by the VVT sensor despite the engine revolving, or the rotations of the camshaft and the crankshaft are not synchronized, the ECM interprets this as a malfunction of the sensor.

MONITOR STRATEGY

Related DTCs	P0340: Camshaft position sensor (Bank 1) open/short P0340: Camshaft position sensor (Bank 1) range check (Chattering) P0342: Camshaft position sensor (Bank 1) range check (low voltage) P0343: Camshaft position sensor (Bank 1) range check (high voltage) P0345: VVT sensor (Bank 2) open/short P0345: VVT position sensor (Bank 2) range check (Chattering) P0347: VVT position sensor (Bank 2) range check (low voltage) P0348: VVT position sensor (Bank 2) range check (high voltage)
Required Sensors / Components (Main)	VVT position sensor (Bank 1 and 2)
Required Sensors / Components (Related)	Crankshaft position sensor
Frequency of Operation	Continuous
Duration	5 seconds: P0340 (Engine running), P0345 4 seconds: Others
MIL Operation	2 driving cycles: P0340 (Camshaft position sensor range check) Immediate: Others
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

ALL:

The monitor will run whenever these DTCs are not present

None

P0340: VVT SENSOR (BANK 1) VERIFY PULSE INPUT (CASE 1)

Engine speed	600 RPM or more
Starter	Off
VVT system misalignment	Not detected
VVT sensor range check fail (P0342, P0343)	Not detected
VVT sensor voltage	0.3 V or more, and 4.7 V or less

P0340: VVT SENSOR (BANK 1) VERIFY PULSE INPUT (CASE 2)

Starter	ON
Minimal battery voltage while starter ON	Below 11 V

P0342, P0343: VVT SENSOR (BANK 1) RANGE CHECK

Starter	Off
Ignition switch	On (IG)
Time after ignition switch off to on (IG)	2 seconds or more
VVT sensor verify pulse input fail (P0340)	Not detected
Battery voltage	8 V or more

P0345: VVT SENSOR (BANK 2) VERIFY PULSE INPUT

Engine speed	600 RPM or more
Starter	Off
VVT sensor range check fail (P0342, P0343, P0347, P0348)	Not detected
VVT sensor voltage	0.3 V or more, and 4.7 V or less
Battery voltage	8 V or more
Ignition switch	On (IG)
Time after ignition switch off to on (IG)	0.5 seconds or more

P0347, P0348: VVT SENSOR (BANK 1) RANGE CHECK

Starter	Off
Ignition switch	On (IG)
Time after ignition switch off to on (IG)	2 seconds or more
VVT sensor verify pulse input fail (P0340, P0345)	Not detected
Battery voltage	8 V or more

TYPICAL MALFUNCTION THRESHOLDS

P0340: VVT SENSOR (BANK 1) VERIFY PULSE INPUT (CASE 1)

Camshaft position and crankshaft position alignment	Misalignment
VVT sensor signal	No signal

P0340: VVT SENSOR (BANK 1) VERIFY PULSE INPUT (CASE 2)

VVT sensor signal

No signal

P0342, P0347: VVT SENSOR (BANK1, 2) RANGE CHECK (LOW VOLTAGE)

VVT sensor voltage

Less than 0.3 V

P0343, P0348: VVT SENSOR (BANK1, 2) RANGE CHECK (HIGH VOLTAGE)

VVT sensor voltage

More than 4.7 V

P0345: VVT SENSOR (BANK 2) VERIFY PULSE INPUT

VVT sensor signal

No signal

COMPONENT OPERATING RANGE

VVT sensor voltage

0.3 to 4.7 V

WIRING DIAGRAM

Refer to DTC P0335, refer to DTC P0335: Crankshaft Position Sensor "A" Circuit; DTC P0339: Crankshaft Position Sensor "A" Circuit Intermittent.

CONFIRMATION DRIVING PATTERN

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn the Techstream on.
3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch on (IG) and turn the Techstream on.
6. Start the engine.
7. Idle the engine for 10 seconds or more [A].
8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].
9. Read the pending DTCs.

   HINT:

   • If a pending DTC is output, the system is malfunctioning.
   • If a pending DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
11. Input the DTC: P0340, P0342, P0343, P0345, P0347 or P0348.
12. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [A] through [B] again.
13. If no pending DTC is output, perform a universal trip and check for permanent DTCs, refer to DTC CHECK / CLEAR .

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

HINT:

• Bank 1 refers to the bank that includes the No. 1 cylinder*.

  *: The No. 1 cylinder is the cylinder which is farthest from the transmission.

• Bank 2 refers to the bank that does not include the No. 1 cylinder.
• Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (SENSOR POWER SOURCE)
   1. Disconnect the VVT sensor connector.

      Fig. 94: Identifying VVT Sensor Connector
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   2. Turn the ignition switch on (IG).
   3. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Bank 1

      Bank 2

      Tester Connection	Switch Condition	Specified Condition
      B22-3 (VC) - Body ground	Ignition switch on (IG)	4.5 to 5.0 V

      Tester Connection	Switch Condition	Specified Condition
      B23-3 (VC) - Body ground	Ignition switch on (IG)	4.5 to 5.0 V

      TEXT IN ILLUSTRATION
      

      *1	Bank 1
      *2	Bank 2
      *a	Front view of wire harness connector (to VVT Sensor for Exhaust Camshaft)

   4. Reconnect the VVT sensor connector.

   NG --> See step 8

   OK: Go to next step

2. CHECK HARNESS AND CONNECTOR (VVT SENSOR - ECM)
   1. Disconnect the VVT sensor connector.
   2. Disconnect the ECM connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)

      Bank 1

      Bank 2

      Tester Connection	Condition	Specified Condition
      B22-1 (VVR+) - B51-9 (VV1+)	Always	Below 1 ohms
      B22-2 (VVR-) - B51-10 (VV1-)	Always	Below 1 ohms

      Tester Connection	Condition	Specified Condition
      B23-1 (VVL+) - B51-12 (VV2+)	Always	Below 1 ohms
      B23-2 (VVL-) - B51-11 (VV2-)	Always	Below 1 ohms

      Standard resistance (Check for short)

      Bank 1

      Bank 2

      Tester Connection	Condition	Specified Condition
      B22-1 (VVR+) or B51-9 (VV1+) - Body ground	Always	10 kohms or higher
      B22-2 (VVR-) or B51-10 (VV1-) - Body ground	Always	10 kohms or higher

      Tester Connection	Condition	Specified Condition
      B23-1 (VVL+) or B51-12 (VV2+) - Body ground	Always	10 kohms or higher
      B23-2 (VVL-) or B51-11 (VV2-) - Body ground	Always	10 kohms or higher

   4. Reconnect the VVT sensor connector.
   5. Reconnect the ECM connector.

   NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (VVT SENSOR - ECM)

   OK: Go to next step

3. CHECK SENSOR INSTALLATION (VVT SENSOR)
   1. Check the VVT sensor installation condition.

      Fig. 95: Checking CKP Sensor Installation
      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      OK

      Sensor is installed correctly.

   NG --> REPAIR OR REPLACE VVT SENSOR

   OK: Go to next step

4. CHECK CAMSHAFT TIMING GEAR ASSEMBLY (TEETH OF PLATE)
   1. Check the teeth of the sensor plate.

      OK

      Sensor plate teeth do not have any cracks or deformation.

   NG --> REPLACE CAMSHAFT TIMING GEAR ASSEMBLY

   OK: Go to next step

5. REPLACE VVT SENSOR
   1. Replace the VVT sensor, refer to COMPONENTS .

   NEXT: Go to next step

6. CHECK WHETHER DTC OUTPUT RECURS
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch on (IG).
   3. Turn the tester on.
   4. Clear the DTCs.
   5. Turn the ignition switch off.
   6. Turn the ignition switch on (IG), and turn the Techstream on.
   7. Start the engine.
   8. Idle the engine for 10 seconds or more.
   9. Select the following menu items: Powertrain / Engine / Trouble Codes.
   10. Read the pending DTCs.

       Result

       Display (DTC Output)	Proceed to
       No output	A
       P0340, P0342, P0343, P0345, P0347 or P0348	B

       HINT:

       If the engine does not start, replace the ECM.

   B --> See step 7

   A --> END

7. REPLACE ECM. Refer to COMPONENTS
8. CHECK HARNESS AND CONNECTOR (VVT SENSOR - ECM)
   1. Disconnect the VVT sensor connector.
   2. Disconnect the ECM connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)

      Bank 1

      Bank 2

      Tester Connection	Condition	Specified Condition
      B22-3 (VC) - B51-15 (VCV1)	Always	Below 1 ohms

      Tester Connection	Condition	Specified Condition
      B23-3 (VC) - B51-16 (VCV2)	Always	Below 1 ohms

      Standard resistance (Check for short)

      Bank 1

      Bank 2

      Tester Connection	Condition	Specified Condition
      B22-3 (VC) or B51-15 (VCV1) - Body ground	Always	10 kohms or higher

      Tester Connection	Condition	Specified Condition
      B23-3 (VC) or B51-16 (VCV2) - Body ground	Always	10 kohms or higher

   4. Reconnect the VVT sensor connector.
   5. Reconnect the ECM connector.

   NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (VVT SENSOR - ECM)

   OK --> See step 7

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