DTC Troubleshooting
DTC Troubleshooting: U0110, U0110
DTC U0110:
F-CAN Malfunction (ECM/PCM-MCM)
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
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.
Are DTC U0029 and U0110 indicated at the same time?
YES -
Go to the troubleshooting for DTC U0029 PGM-FI System.
NO -
Go to step 4.
4. Clear the DTC with the HDS.
5. Check for Pending or Confirmed DTCs with the HDS.
Is DTC U0110 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 motor control module (MCM) and the ECM/PCM.
6. Check for Pending or Confirmed DTCs with the HDS again.
Are DTC U0110 and U1205 indicated at the same time?
YES -
Go to step 7.
NO -
Update the motor control module (MCM) if it does not have the latest software Testing and Inspection, or substitute a known-good motor control module (MCM), then go to step 27 and recheck. If DTC U0110 is not indicated with a known-good motor control module (MCM), replace the original motor control module (MCM) Service and Repair, then go to step 27.
7. Turn the ignition switch to LOCK (0).
8. Turn the battery module switch OFF.
9. Remove the IPU cover IPU Cover Removal/Installation.
10. Remove the PCU lid, the PCU busplate, and the PCU cover Service and Repair.
11. Check for poor connections or loose terminals at motor control module (MCM) connector A (31P).
Are the connections and the terminals OK?
YES -
Go to step 12.
NO -
Repair the connections or the terminals, then go to step 24.
12. Turn the ignition switch to ON (II).
13. Measure the voltage between motor control module (MCM) connector terminal A9 and body ground within 1 second.
Is there 12V battery voltage?
YES -
Go to step 14.
NO -
Go to step 16.
14. Turn the ignition switch to LOCK (0).
15. Check for continuity between motor control module (MCM) connector terminal A6 and body ground.
Is there continuity?
YES -
Update the motor control module (MCM) if it does not have the latest software Testing and Inspection, or substitute a known-good motor control module (MCM), then go to step 24 and recheck. If DTC U0110 is not indicated with a known-good motor control module (MCM), replace the original motor control module (MCM) Service and Repair, then go to step 24.
NO -
Repair an open in the wire between the motor control module (MCM) (A6) and G901, then go to step 24.
16. Turn the ignition switch to LOCK (0).
17. Remove the motor control module (MCM) relay 1.
18. Test motor control module (MCM) relay 1 Testing and Inspection.
Is the relay OK?
YES -
Go to step 19.
NO -
Replace motor control module (MCM) relay 1, then go to step 24.
19. Check the No. B42 IMA1 (7.5 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?
YES -
Go to step 20.
NO -
- Repair a short in the wire between the No. B42 IMA1 (7.5 A) fuse and motor control module (MCM) relay 1. Also replace the No. B42 IMA1 (7.5 A) fuse, then go to step 24.
- Repair a short in the wire between the motor control module (MCM) relay 1 and the motor control module (MCM). Also replace the No. B42 IMA1 (7.5 A) fuse, then go to step 24.
20. Measure the voltage between rear relay block 8P connector (motor control module (MCM) relay 1) terminal No. 6 and body ground.
Is there battery voltage?
YES -
Go to step 21.
NO -
Repair an open in the wire between the No. B42 IMA1 (7.5 A) fuse and motor control module (MCM) relay 1, then go to step 23.
21. Check for continuity between rear relay block 8P connector (motor control module (MCM) relay 1) terminal No. 5 and motor control module (MCM) connector terminal A9.
Is there continuity?
YES -
Go to step 22.
NO -
Repair an open in the wire between the motor control module (MCM) (A9) and motor control module (MCM) relay 1, then go to step 24.
22. Check for continuity between rear relay block 8P connector (motor control module (MCM) relay 1) terminal No. 8 and motor control module (MCM) connector terminal A3.
Is there continuity?
YES -
Update the motor control module (MCM) if it does not have the latest software Testing and Inspection, or substitute a known-good motor control module (MCM), then go to step 24 and recheck. If DTC U0110 is not indicated with a known-good motor control module (MCM), replace the original motor control module (MCM) Service and Repair, then go to step 24.
NO -
Repair an open in the wire between the motor control module (MCM) (A3) and motor control module (MCM) relay 1, then go to step 24.
23. Turn the ignition switch to LOCK (0).
24. Reconnect all connectors.
25. Reinstall the PCU cover, the PCU busplate, and the PCU lid Service and Repair.
26. Reinstall the IPU cover IPU Cover Removal/Installation.
27. Turn the battery module switch ON.
28. Turn the ignition switch to ON (II).
29. Reset the ECM/PCM with the HDS.
30. Do the ECM/PCM idle learn procedure ECM/PCM Idle Learn Procedure.
31. Check for Pending or Confirmed DTCs with the HDS.
Is DTC U0110 indicated?
YES -
Check for poor connections or loose terminals at the motor control module (MCM), and the ECM/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.