Fuel and Emissions
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.
- Information marked with an asterisk (*) applies to the '06-07 models.
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Check for Temporary DTCs or DTCs with the HDS.
Are DTC U0028 and U0110 indicated at the same time?
YES - Go to troubleshooting for DTC U0028.
NO - Go to step 4.
4. Clear the DTC with the HDS.
5. Check for Temporary DTCs or 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 MCM, the BCM module, and the PCM
6. Check for Temporary DTCs or DTCs With the HDS again.
Are DTC U0110 and U1205 indicated at the same time?
YES - Go to step 7.
NO - Go to step 16.
7. Turn the ignition switch OFF.
8. Remove the rear seat.
9. Turn the battery module switch OFF.
10. Remove the IPU lid.
11. Disconnect the BCM module connectors (A), then remove the BCM module (B).
12. Check for poor connections at the MCM 20P connector (C).
Are the connections OK?
YES - Go to step 13.
NO - Repair the poor connections at the MCM 20P connector, then go to step 33.
13. Disconnect the MCM 20P connector.
14. Reconnect the BCM module connector A (40P), then turn the ignition switch ON (II), and measure voltage between MCM 20P connector terminal No. 18 and body ground within 1 second.
Is there battery voltage?
YES - Go to step 15.
NO - Go to step 24.
15. Check for continuity between body ground and MCM 20P connector terminals No. 2 and No. 9 individually.
Is there continuity?
YES - Update the MCM if it does not have the latest software, or substitute a known-good MCM, then go to step 33 and recheck. If DTC U0110 is not indicated with a known-good MCM, replace the original MCM, then go to step 33.
NO - Repair open in the wire between the MCM (No. 2 and/or No. 9) and G102, then go to step 33.
16. Turn the ignition switch OFF.
17. Remove the rear seat.
18. Turn the battery module switch OFF.
19. Remove the IPU lid.
20. Disconnect the BCM module connector (A), then remove the BCM module (B).
21. Disconnect the MCM 20P connector (C).
22. Check for continuity between BCM module connector terminal A1 and MCM 20P connector terminal No. 20.
Is there continuity?
YES - Go to step 23.
NO - Repair open in the wire between the BCM module (A1) and the MCM (No. 20), then go to step 33.
23. Check for continuity between BCM module connector terminal A21 and MCM 20P connector terminal No. 10.
Is there continuity?
YES - Update the MCM if it does not have the latest software, or substitute a known-good MCM, then go to step 33 and recheck. If DTC U0110 is not indicated with a known-good MCM, replace the original MCM, then go to step 33.
NO - Repair open in the wire between the BCM module (A21) and the MCM (No. 10), then go to step 33.
24. Turn the ignition switch OFF.
25. Remove MCM relay 2, and test it.
Is MCM relay 2 OK?
YES - Go to step 26.
NO - Replace MCM relay 2, then go to step 33.
26. Check the +B IMA2 (10 A) fuse in the auxiliary under-hood fuse/relay box.
Is the fuse OK?
YES - Go to step 27.
NO -
- Repair short in the wire between the +B IMA2 (10 A) fuse and MCM relay 2. Also replace the +B IMA2 (10 A) fuse, then go to step 33.
- Repair short in the wire between the MCM relay 2 and the MCM, the IPU module fan. Also replace the +B IMA2 (10 A) fuse, then go to step 33.
27. Measure voltage between MCM relay 2 4P connector terminal No. 2 and body ground.
Is there battery voltage?
YES - Go to step 28.
NO - Repair open in the wire between the +B IMA2 (10 A) fuse and MCM relay 2, then go to step 33.
28. Check for continuity between MCM relay 2 4P connector terminal No. 1 and MCM 20P connector terminal No. 18.
Is there continuity?
YES - Go to step 29.
NO - Repair open in the wire between the MCM (No. 18) and MCM relay 2, then go to step 33.
29. Disconnect BCM module connector A (40P).
30. Check for continuity between MCM relay 2 4P connector terminal No. 3 and BCM module connector terminal A12.
Is there continuity?
YES - Go to step 31.
NO - Repair open in the wire between the BCM module (A12) and MCM relay 2, then go to step 33.
31. Remove MCM relay 1.
32. Check for continuity between MCM relay 1 4P connector terminal No. 1 and MCM relay 2 4P connector terminal No. 4.
Is there continuity?
YES - Update the BCM module if it does not have the latest software, or substitute a known-good BCM module, then go to step 33 and recheck. If DTC U0110 is not indicated with a known-good BCM module, replace the original BCM module, then go to step 33.
NO - Repair open in the wire between MCM relay 1 and MCM relay 2, then go to step 33.
33. Turn the ignition switch OFF.
34. Reconnect all connectors.
35. Reinstall the IPU lid, then turn the battery module switch ON.
36. Turn the ignition switch ON (II).
37. Reset the PCM with the HDS.
38. Do the PCM idle learn procedure.
39. Check for Temporary DTCs or DTCs with the HDS.
Is DTC U0110 indicated?
YES - Check for poor connections or loose terminals at the MCM, the BCM module, and the PCM, then go to step 1.
NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.