DTC Troubleshooting

DTC U0114: F-CAN Malfunction (PCM-VTM-4 Control Unit)

NOTE:
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
- If DTC U0073 is stored at the same time as DTC U0114, troubleshoot DTC U0073 first, then recheck for DTC U0114.
- Information marked with an asterisk (*) applies to the CANL line.

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Check for Temporary DTCs or DTCs with the HDS.

Is DTC U0114 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 VTM-4 control unit and the PCM.

4. Check for a VTM-4 system DTCs in the DTCs MENU with the HDS.

Is VTM-4 DTC 41 indicated?

YES - Go to step 5.

NO - Go to step 11.

5. Turn the ignition switch OFF.
6. Jump the SCS line with the HDS.
7. Disconnect PCM connector A (44P).
8. Disconnect VTM-4 control unit connector A (22P).
9. Connect VTM-4 control unit 22P connector terminals A11 and A22 * to body ground with a jumper wire.






10. Check for continuity between PCM connector terminal A36 and A1* and body ground individually.






Is there continuity?

YES - Substitute a known-good VTM-4 control unit, then go to step 20 and recheck. If DTC U0114 is not indicated, replace the original VTM-4 control unit, then go to step 20.

NO - Repair open in the wire between the VTM-4 control unit (A11 (A22)*) and the PCM (A36 (A1)*), then go to step 20.

11. Check for poor connections at the VTM-4 control unit connectors A (20P) and B (12P).

Are the connections OK?

YES - Go to step 9.

NO - Repair the connections, then go to step 20.

12. Turn the ignition switch OFF.
13. If not already done, disconnect VTM-4 control unit connector A (22P).
14. Turn the ignition switch ON (II).
15. Measure voltage between VTM-4 control unit 22P connector terminal A1 and body ground.






Is there battery voltage?

YES - Go to step 16.

NO-Check the No. 11 VTM-4 (7.5 A) fuse in the driver's under-dash fuse/relay box. If the fuse is OK, repair open in the wire between the No. 11 VTM-4 (7.5 A) fuse and the VTM-4 control unit, then go to step 19.

16. Turn the ignition switch OFF.
17. Disconnect VTM-4 control unit connector B (12P).
18. Check for continuity between VTM-4 control unit 12P connector terminal B5 and body ground.






Is there continuity?

YES - Substitute a known-good VTM-4 control unit, then go to step 20 and recheck. If DTC U0114 is not indicated, replace the original VTM-4 control unit, then go to step 20.

NO - Repair open in the wire between the VTM-4 control unit and G602, then go to step 20.

19. Turn the ignition switch OFF.
20. Reconnect all connectors.
21. Turn the ignition switch ON (II).
22. Reset the PCM with the HDS.
23. Do the PCM idle learn procedure.
24. Check for Temporary DTCs or DTCs with the HDS.

Is DTC U0114 indicated?

YES - Check for poor connections or loose terminals at the VTM-4 control unit 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.