DTC Troubleshooting
DTC P16C4: Engine Mount Actuator Control Power Circuit Stuck OFFNOTE: 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. Clear the DTCs with the HDS.
3. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P16C4 indicated?
YES - Go to step 4.
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.
4. Turn the ignition switch OFF.
5. Inspect the No. 5 ACM (10 A) fuse in the auxiliary under-hood fuse box.
Is the fuse OK?
YES - Go to step 9.
NO - Go to step 6.
6. Remove the driver's dashboard lower cover, then remove the active control engine mount (ACM) control relay (A).
7. Disconnect the engine mount control unit 20P connector.
8. Check for continuity between body ground and engine mount control unit 20P connector terminals No. 3 and No. 12 individually.
Is there continuity?
YES - Repair short in the wire between the engine mount control unit (No. 3, No. 12) and active control engine mount (ACM) control relay. Also replace the No. 5 ACM (10 A) fuse, then go to step 20.
NO - Repair short in the wire between active control engine mount (ACM) control relay and the No. 5 ACM (10 A) fuse. Also replace the No. 5 ACM (10 A) fuse, then go to step 20.
9. Remove the driver's dashboard lower cover, then remove the active control engine mount (ACM) control relay (A).
10. Test the active control engine mount (ACM) control relay
Is the active control engine mount (ACM) control relay OK?
YES - Go to step 11.
NO - Replace the active control engine mount (ACM) control relay, then go to step 20.
11. Measure voltage between active control engine mount (ACM) control relay 4P connector terminal No. 1 and body ground.
Is there battery voltage?
YES - Go to step 12.
NO - Repair open in the wire between the active control engine mount (ACM) control relay and the No. 5 ACM (10 A) fuse, then go to step 20.
12. Disconnect the engine mount control unit 20P connector.
13. Check for continuity between active control engine mount (ACM) control relay 4P connector terminal No. 2 and engine mount control unit 20P connector terminals No. 3 and No. 12 individually.
Is there continuity?
YES - Go to step 14.
NO - Repair open in the wire between the engine mount control unit (No. 3 (No. 12)) and active control engine mount (ACM) control relay, then go to step 20.
14. Turn the ignition switch ON (II).
15. Measure voltage between active control engine mount (ACM) control relay 4P connector terminal No. 4 and body ground.
Is there battery voltage?
YES - Go to step 18.
NO - Go to step 16.
16. Turn the ignition switch OFF.
17. Inspect the No. 9 BACK UP LIGHT, INSTRUMENT LIGHT (10 A) fuse in the driver's under-dash fuse/relay box.
Is the fuse OK?
YES - Repair open in the wire between the active control engine mount (ACM) control relay and the No. 9 BACK UP LIGHT, INSTRUMENT LIGHT (10 A) fuse, then go to step 20.
NO - Repair short in the wire between active control engine mount (ACM) control relay and the No. 9 BACK UP LIGHT, INSTRUMENT LIGHT (10 A) fuse. Also replace the No. 9 BACK UP LIGHT, INSTRUMENT LIGHT (10 A) fuse, then go to step 20.
18. Turn the ignition switch OFF.
19. Check for continuity between engine mount control unit 20P connector terminal No. 8 and active control engine mount (ACM) control relay 4P connector terminal No. 3.
Is there continuity?
YES - Replace the engine mount control unit, then go to step 20.
NO - Repair open in the wire between the engine mount control unit (No. 8) and the active control engine mount (ACM) control relay, then go to step 20.
20. Reconnect all connectors.
21. Turn the ignition switch ON (II).
22. Reset the PCM with the HDS.
23. Do the PCM idle learn procedure.
24. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P16C4 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.