Fig. 1: Identifying Engine Mount Control System Component Location
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Fig. 2: Engine Mount Control System - Circuit Diagram
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Special Tools Required
Vacuum pump/gauge, 0-30 in.Hg Snap-on YA4000A or equivalent, commercially available
NOTE:
Check the vacuum hoses and lines for damage and proper connections before troubleshooting.
Follow this procedure if the engine vibrates excessively when idling.
Is ON indicated at idling and OFF indicated at 2,000 rpm?
YES -Go to step 4.
NO -Update the engine control module (ECM)/ powertrain control module (PCM) if it does not have the latest software (see UPDATING THE ECM/PCM ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then recheck. If the engine mount control system works properly, and the ECM/PCM was updated, the troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM, '04-05 models (see ECM/PCM REPLACEMENT ), '06-08 models (see '06-08 MODELS ).
Fig. 3: Measuring Voltage Between Engine Mount Control Solenoid Valve 2P Connector Terminal No. 2 And Body Ground
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Is there battery voltage?
YES -Go to step 8.
NO -Repair open in the wire between engine mount control solenoid valve 2P connector terminal No. 2 and No. 18 (15 A) fuse in the under-dash fuse/relay box.
Fig. 4: Measuring Voltage Between Engine Mount Control Solenoid Valve 2P Connector Terminals No. 1 And No. 2
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Is there battery voltage?
YES -Go to step 10.
NO -Repair open in the wire between ECM/PCM (B15) and the engine mount control solenoid valve 2P connector. If the wire is OK, update the ECM/PCM if it does not have the latest software (see UPDATING THE ECM/PCM ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), and recheck. If the engine mount control system works properly, and the ECM/PCM was updated, the troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM, '04-05 models (see ECM/PCM REPLACEMENT ), '06-08 models (see '06-08 MODELS ).
Fig. 5: Measuring Voltage Between Engine Mount Control Solenoid Valve 2P Connector Terminals No. 1 And No. 2
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Is there battery voltage?
YES -Repair short to body ground in the wire between ECM/PCM (B15) and the engine mount control solenoid valve. If the wire is OK, update the ECM/PCM if it does not have the latest software (see UPDATING THE ECM/PCM ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), and recheck. If the engine mount control system works properly, and the ECM/PCM was updated, the troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM, '04-05 models (see ECM/PCM REPLACEMENT ), '06-08 models (see '06-08 MODELS ).
NO -Go to step 12.
Fig. 6: Disconnecting Upper Vacuum Hose From Engine Mount Control Solenoid Valve And Connect Vacuum Pump/Gauge To Hose
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Does the engine mount hold vacuum?
YES -Go to step 14.
NO -Either the vacuum hose or the engine mount has a vacuum leak. Repair as needed.
Is there a noticeable change in idle smoothness with and without vacuum applied?
YES -Go to step 15.
NO -Replace the front engine mount.
Fig. 7: Connecting Vacuum Pump/Gauge To Engine Mount Control Solenoid Valve
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Is there manifold vacuum at idle, and a decrease in manifold vacuum when you raise the engine speed above 1,000 rpm?
YES -The system is OK.
NO -Replace the engine mount control solenoid valve.