DTC Troubleshooting

DTC Troubleshooting: P16C4

DTC P16C4:

Engine Mount Actuator Control Power Circuit Stuck OFF

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshots, and review the general troubleshooting information Initial Inspection and Diagnostic Overview.

1. Turn the ignition switch to ON (II).

2. Clear the DTC with the HDS.

3. Check for Pending or Confirmed 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 to LOCK (0).

5. Inspect the No. 12 ACM (10 A) fuse in the under-hood fuse/relay box.

Is the fuse OK?

YES -

Go to step 9.

NO -

Go to step 6.

6. Remove the active control engine mount (ACM) control relay (A) from the under-hood fuse/relay box.






7. Disconnect the engine mount control unit 16P connector.

8. Check for continuity between engine mount control unit 16P connector terminal No. 10 and body ground.





Is the continuity?

YES -

Repair a short to ground in the wire between engine mount control unit 16P connector terminal No. 10 and the active control engine mount (ACM) control relay. Also replace the No. 12 ACM (10 A) fuse, then go to step 20.

NO -

Repair a short to ground in the wire between the active control engine mount (ACM) control relay and the No. 12 ACM (10 A) fuse. Also replace the No. 12 ACM (10 A) fuse and the under-hood fuse/relay box, then go to step 20.

9. Remove the active control engine mount (ACM) control relay (A) from the under-hood fuse/relay box.






10. Check the active control engine mount (ACM) control relay Testing and Inspection.

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 the voltage between active control engine mount (ACM) control relay 5P socket terminal No. 1 and body ground.





Is there battery voltage?

YES -

Go to step 12.

NO -

Repair an open in the wire between the active control engine mount (ACM) control relay and the No. 12 ACM (10 A) fuse, Also replace the under-hood fuse/relay box, then go to step 20.

12. Disconnect the engine mount control unit 16P connector.

13. Check for continuity between active control engine mount (ACM) control relay 5P socket terminal No. 2 and engine mount control unit 16P connector terminal No. 10.





Is there continuity?

YES -

Go to step 14.

NO -

Repair an open in the wire between engine mount control unit 16P connector terminal No. 10 and the active control engine mount (ACM) control relay, then go to step 20.

14. Turn the ignition switch to ON (II).

15. Measure the voltage between active control engine mount (ACM) control relay 5P socket terminal No. 5 and body ground.





Is there battery voltage?

YES -

Go to step 18.

NO -

Go to step 16.

16. Turn the ignition switch to LOCK (0).

17. Inspect the No. 10 IG METER (7.5 A) fuse in the under-dash fuse/relay box.

Is the fuse OK?

YES -

Repair an open in the wire between the active control engine mount (ACM) control relay and the No. 10 IG METER (7.5 A) fuse, then go to step 20.

NO -

Repair a short to ground in the wire between the active control engine mount (ACM) control relay and the No. 10 IG METER (7.5 A) fuse. Also replace the No. 10 IG METER (7.5 A) fuse, then go to step 20.

18. Turn the ignition switch to LOCK (0).

19. Check for continuity between engine mount control unit 16P connector terminal No. 11 and active control engine mount (ACM) control relay 5P socket terminal No. 3.





Is there continuity?

YES -

Replace the engine mount control unit Service and Repair, then go to step 20.

NO -

Repair an open in the wire between engine mount control unit 16P connector terminal No. 11 and the active control engine mount (ACM) control relay, then go to step 20.

20. Reconnect all connectors.

21. Turn the ignition switch to ON (II).

22. Clear the DTC with the HDS.

23. Check for Pending or Confirmed 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 Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.�