DTC Troubleshooting

DTC Troubleshooting: P15AB

DTC P15AB:

Engine Mount Control Unit Power Source Circuit Low Voltage

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshots, and review the general troubleshooting information Reading and Clearing Diagnostic Trouble Codes.

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

2. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P16C5 indicated?

YES -

Do the troubleshooting for the DTC P16C5 P16C5.

NO -

Go to step 3.

3. Clear the DTC with the HDS.

4. Start the engine, and let it idle 10 seconds.

5. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P15AB indicated?

YES -

Go to step 6.

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 body ground (G302).�

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

7. Inspect the No. 7 ACG fuse in the driver's under-dash fuse/relay box.

Is the fuse OK?

YES -

Go to step 8.

NO -

Repair short to ground in the wire between the No. 7 ACG fuse and engine mount control unit 16P connector terminal No. 5. Also replace the No. 7 ACG fuse, then go to step 14.

8. Check for poor connections or loose terminals at the engine mount control unit 16P connector.

Are the connections and the terminals OK?

YES -

Go to step 9.

NO -

Repair the connections or the terminals, then go to step 14.

9. Disconnect engine mount control unit 16P connector.

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

11. Measure the voltage between engine mount control unit 16P connector terminal No. 5 and body ground.





Is there battery voltage?

YES -

Go to step 12.

NO -

Repair open in the wire between the No. 7 ACG fuse and engine mount control unit 16P connector terminal No. 5. Turn the ignition switch to Lock (0), then go to step 14.

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

13. Check for continuity between engine mount control unit 16P connector terminal No. 3 and body ground.





Is there continuity?

YES -

Replace the engine mount control unit Service and Repair, then go to step 14.

NO -

Repair open in the wire between engine mount control unit 16P connector terminal No. 3 and body ground (G302), then go to step 14.

14. Reconnect all connectors.

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

16. Clear the DTC with the HDS.

17. Start the engine, and let it idle 10 seconds.

18. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P15AB indicated?

YES -

Check for poor connections or loose terminals at the engine mount control unit and body ground (G302), then recheck. If the symptom still does not go away, replace the engine mount control unit.�

NO -

Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.�