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Diagnosis and repair



ROAD TESTING VEHICLE
The following Shift Point Road Test and Torque Converter Clutch Operation Test provide diagnostic information on transmission shift controls and torque converter operation.

SHIFT POINT ROAD TEST

NOTE: Always drive the vehicle in a safe manner according to driving conditions and obey all traffic laws.

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This test verifies that the shift control system is operating properly.
1.Bring engine and transmission up to normal operating temperature.
2.Operate the vehicle with the transmission range selector lever in (D) range.
3.Apply minimum throttle and observe the speeds at which the upshift occurs and the torque converter engages. (Refer to Automatic Transmission Special Specification Bulletin FPS-12180-98 for actual speed.)
4.With the vehicle in OVERDRIVE (fourth gear), depress the transmission control switch. The transmission should downshift to third gear. Remove foot from accelerator pedal; engine braking should occur.
5.Press accelerator pedal to floor (wide-open throttle). Transmission should shift from third to second gear or third to first, depending on vehicle speed. Torque converter clutch should disengage and then reapply.
6.With vehicle (D) range above 80 km/h (50 mph) and less than half throttle, move the transmission range selector lever from (D) range to MANUAL 2 range and remove foot from accelerator pedal. The transmission should immediately downshift into second gear. With the vehicle remaining in MANUAL 2 range, move transmission range selector lever into MANUAL 1 range. Transmission should downshift into first gear at speeds BELOW 48-56 km/h (30-35 mph).
7.If transmission fails to upshift/downshift or torque converter clutch does not apply and release, refer to Diagnosis by Symptom Index for concern diagnosis.

TORQUE CONVERTER CLUTCH OPERATION TEST
This test verifies that the torque converter clutch control system and the torque converter are operating properly.
1.Perform Quick Test; refer to On-Board Diagnostics with NGS. Check for DTCs; Refer to the Diagnostic Trouble Code Chart.
2.Connect a tachometer to the engine.
3.Bring the engine to normal operating temperature by driving the vehicle at highway speeds for approximately 15 minutes in (D) position.
4.After normal operating temperature is reached, maintain a constant vehicle speed of about 80 km/h (50 mph) and tap brake pedal with the left foot.
5.Engine rpm should increase when brake pedal is tapped and decrease about five seconds after pedal is released. If this does not occur, refer to Torque Converter Clutch Operation Concerns in the Diagnosis by Symptom Index.
6.If the vehicle stalls in (D) or manual 2 at idle with vehicle at a stop, move the transmission range selector lever to manual 1 position. If the vehicle stalls, refer to Torque Converter Clutch Operation Concerns in the Diagnosis by Symptom Index. Repair as required. If the vehicle does not stall in (D), refer to Diagnosis by Symptom Index.

ROAD TESTING VEHICLE
The following Shift Point Road Test and Torque Converter Clutch Operation Test provide diagnostic information on transmission shift controls and torque converter operation.

SHIFT POINT ROAD TEST

NOTE: Always drive the vehicle in a safe manner according to driving conditions and obey all traffic laws.




This test verifies that the shift control system is operating properly.
1.Bring engine and transmission up to normal operating temperature.
2.Operate the vehicle with the transmission range selector lever in (D) range.
3.Apply minimum throttle and observe the speeds at which the upshift occurs and the torque converter engages. (Refer to Automatic Transmission Special Specification Bulletin FPS-12180-98 for actual speed.)
4.With the vehicle in OVERDRIVE (fourth gear), depress the transmission control switch. The transmission should downshift to third gear. Remove foot from accelerator pedal; engine braking should occur.
5.Press accelerator pedal to floor (wide-open throttle). Transmission should shift from third to second gear or third to first, depending on vehicle speed. Torque converter clutch should disengage and then reapply.
6.With vehicle (D) range above 80 km/h (50 mph) and less than half throttle, move the transmission range selector lever from (D) range to MANUAL 2 range and remove foot from accelerator pedal. The transmission should immediately downshift into second gear. With the vehicle remaining in MANUAL 2 range, move transmission range selector lever into MANUAL 1 range. Transmission should downshift into first gear at speeds BELOW 48-56 km/h (30-35 mph).
7.If transmission fails to upshift/downshift or torque converter clutch does not apply and release, refer to Diagnosis by Symptom Index for concern diagnosis.

TORQUE CONVERTER CLUTCH OPERATION TEST
This test verifies that the torque converter clutch control system and the torque converter are operating properly.
1.Perform Quick Test; refer to On-Board Diagnostics with NGS. Check for DTCs; Refer to the Diagnostic Trouble Code Chart.
2.Connect a tachometer to the engine.
3.Bring the engine to normal operating temperature by driving the vehicle at highway speeds for approximately 15 minutes in (D) position.
4.After normal operating temperature is reached, maintain a constant vehicle speed of about 80 km/h (50 mph) and tap brake pedal with the left foot.
5.Engine rpm should increase when brake pedal is tapped and decrease about five seconds after pedal is released. If this does not occur, refer to Torque Converter Clutch Operation Concerns in the Diagnosis by Symptom Index.
6.If the vehicle stalls in (D) or manual 2 at idle with vehicle at a stop, move the transmission range selector lever to manual 1 position. If the vehicle stalls, refer to Torque Converter Clutch Operation Concerns in the Diagnosis by Symptom Index. Repair as required. If the vehicle does not stall in (D), refer to Diagnosis by Symptom Index.




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