DTC Troubleshooting
DTC Troubleshooting: U0110
DTC U0110:
F-CAN Malfunction (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.�
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 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 MCM, then go to step 27 and recheck. If DTC U0110 is not indicated with a known-good MCM, replace the original MCM, 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.
10. Remove the PCU lid, the PCU busplate, and the PCU cover.
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 poor connections or loose terminals at MCM connector A (31P), then go to step 24.
12. Turn the ignition switch to ON (II).
13. Measure the voltage between MCM connector terminal A1 and body ground within 1 second.
Is there 12 volt 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 MCM connector terminal A4 and body ground.
Is there continuity?
YES -
Update the MCM if it does not have the latest software Testing and Inspection, or substitute a known-good MCM, then go to step 23 and recheck. If DTC U0110 is not indicated with a known-good MCM, replace the original MCM, then go to step 23.
NO -
Repair an open in the wire between the MCM connector (A4) and G901, then go to step 23.
16. Turn the ignition switch to LOCK (0).
17. Remove MCM relay 1.
18. Test MCM relay 1.
Is the relay OK?
YES -
Go to step 19.
NO -
Replace MCM relay 1,then go to step 24.
19. Check the No. 42 +B IMA1 (10 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. 42 +B IMA1 (10 A) fuse and MCM relay 1. Also replace the No. 42 +B IMA1 (10 A) fuse, then go to step 24.
- Repair a short in the wire between MCM relay 1 and the MCM. Also replace the No. 42 +B IMA1 (10 A) fuse, then go to step 24.
20. Measure the voltage between MCM relay 1 4P connector terminal No. 2 and body ground.
Is there 12 volt battery voltage?
YES -
Go to step 21.
NO -
Repair an open in the wire between the +B IMA1 (10 A) fuse and MCM relay 1, then go to step 23.
21. Check for continuity between MCM relay 1 4P connector terminal No. 1 and MCM connector terminal A1.
Is there continuity?
YES -
Go to step 22.
NO -
Repair an open in the wire between the MCM connector (A1) and MCM relay 1, then go to step 24.
22. Check for continuity between MCM relay 1 4P connector terminal No. 3 and MCM connector terminal A7.
Is there continuity?
YES -
Update the MCM if it does not have the latest software Testing and Inspection, or substitute a known-good MCM, then go to step 24 and recheck. If DTC U0110 is not indicated with a known-good MCM, replace the original MCM, then go to step 24.
NO -
Repair an open in the wire between the MCM connector (A7) and 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.
26. Reinstall the IPU cover.
27. Turn the battery module switch ON.
28. Turn the ignition switch to ON (II).
29. Reset the PCM with the HDS.
30. Do the 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 MCM 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.�