DTC Troubleshooting

DTC P16C5: Engine Mount Actuator Control Power Circuit Stuck ON

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

1. Turn the ignition switch ON (II).
2. Check the ACM BATTERY VOLTAGE and ACM RELAY in the DATA LIST with the HDS.

Does the ACM BATTERY VOLTAGE indicate battery voltage when the ACM RELAY indicate OFF?

YES - Go to step 3.

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the engine mount control unit and the active control engine mount (ACM) control relay.

3. Check the active control engine mount (ACM) control relay.

Is the active control engine mount (ACM) control relay OK?

YES - Go to step 4.

NO - Replace the active control engine mount (ACM) control relay, then go to step 9.

4. Turn the ignition switch OFF.
5. Disconnect the engine mount control unit 20P connector.




6. Remove the right kick panel, then remove the active control engine mount (ACM) control relay (A) from the passenger's under-dash fuse/relay box.




7. Measure voltage between body ground and engine mount control unit 20P connector terminals No. 3 and No. 12 individually.

Is there battery voltage?

YES - Repair short to power in the wire between the engine mount control unit (No. 3, No. 12) and the active control engine mount (ACM) control relay, then go to step 9.

NO - Go to step 8.




8. Check for continuity between engine mount control unit 20P connector terminal No. 8 and body ground.

Is there continuity?

YES - Repair short in the wire between the engine mount control unit (No. 8) and the active control engine mount (ACM) control relay, then go to step 9.

NO - Replace the engine mount control unit, then go to step 9.

9. Reconnect all connectors.
10. Turn the ignition switch ON (II).
11. Reset the PCM with the HDS.
12. Do the PCM idle learn procedure.
13. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P16C5 indicated?

YES - Check for poor connections or loose terminals at the engine mount control unit and the active control engine mount (ACM) control relay, then go to step 1.

NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.