DTC Troubleshooting

DTC Troubleshooting: U1101

DTC U1101:

F-CAN Malfunction (PCM-ACM)

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, 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 U1101 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 PCM.

4. Check for ACM system DTCs in the DTCs MENU with the HDS.

Is DTC P15AB indicated?

YES -

Go to the ACM system DTC P15AB troubleshooting DTC Troubleshooting.

NO -

Go to step 5.

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

6. Jump the SCS line with the HDS.

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

8. Disconnect PCM connector A (49P).

9. Check for continuity between PCM connector terminal A48 and engine mount control unit 16P connector terminal No. 13.





Is there continuity?

YES -

Go to step 10.

NO -

Repair an open in the wire between the PCM (A48) and the engine mount control unit, then go to step 11.

10. Check for continuity between PCM connector terminal A49 and engine mount control unit 16P connector terminal No. 15.





Is there continuity?

YES -

Substitute a known-good engine mount control unit Service and Repair, then go to step 11 and recheck. If DTC U1101 is not indicated after substitution, replace the original engine mount control unit Service and Repair, then go to step 11.

NO -

Repair an open in the wire between the PCM (A49) and the engine mount control unit, then go to step 11.

11. Reconnect all connectors.

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

13. Reset the PCM with the HDS.

14. Do the PCM idle learn procedure PCM Idle Learn Procedure.

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

Is DTC U1101 indicated?

YES -

Check for poor connections or loose terminals at the engine mount control unit and the PCM, 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.