U1204 (95)

DTC U1204 (95): IMA-CAN Malfunction (PCM-MCM)

NOTE:
- To verify this is the appropriate troubleshooting procedure, jump the SCS with the HDS and read the flash code, or change the HDS setup to show HM codes and read the HM code.
- Before you troubleshoot, record all freeze data, and review the general troubleshooting information.

1. Turn the ignition switch ON (II).
2. Check for Temporary DTCs or DTCs in the IMA SYSTEM with the HDS.

Is DTC U0037 (98) indicated?

YES - Do the troubleshooting for DTC U0037 (98).

NO - Go to step 3.

3. Clear the DTC with the HDS.
4. Check for Temporary DTCs or DTCs in the IMA SYSTEM with the HDS.

Is DTC U1204 (95) indicated?

YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the PCM, the BCM module, the A/C compressor driver, and the MCM.

5. Check for Temporary DTCs or DTCs in the IMA SYSTEM with the HDS.

Are DTC U1204 (55) and U1204 (95) indicated at the same time?

YES - Go to step 6.

NO - Go to step 22.

6. Turn the ignition switch OFF.
7. Jump the SCS line with the HDS.
8. Disconnect PCM connector A (44P).
9. Turn the battery module switch OFF.
10. Remove the IPU lid.
11. Remove the BCM module.
12. Disconnect the MCM 20P connector.
13. Connect PCM connector terminals A38 and A39 to body ground with a jumper wire.






14. Check for continuity between body ground and MCM 20P connector terminals No. 1 and No. 11 individually.






Is there continuity?

YES - Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM, then go to step 15.

NO - Repair open in the wire between the PCM and the MCM (No. 1, No. 11), then go to step 15.

15. Turn the ignition switch OFF.
16. Reconnect all connectors.
17. Reinstall the IPU lid, then turn the battery module switch ON.
18. Turn the ignition switch ON (II).
19. Clear the DTC with the HDS.
20. Check for Temporary DTCs or DTCs in the IMA SYSTEM with the HDS.

Is DTC U1204 (95) indicated?

YES - Check for poor connections or loose terminals at the PCM, the BCM module, and the MCM, then go to step 1.

NO - Go to step 21.

21. Monitor the OBD STATUS for DTC U1204 (95) in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 19, go to the indicated DTC's troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the PCM, the BCM module, and the MCM, then go to step 1. If the screen indicates NOT COMPLETED, keep the ignition switch ON (II) until a result comes on.

22. Update the MCM if it does not have the latest software, or substitute a known-good MCM.
23. Check for Temporary DTCs or DTCs in the IMA SYSTEM with the HDS.

Is DTC U1204 (95) indicated?

YES - Check for poor connections or loose terminals at the PCM, the BCM module, and the MCM. If the MCM was updated, substitute a known-good MCM, then recheck. If the MCM was substituted, go to step 1.

NO - Go to step 24.

24. Monitor the OBD STATUS for DTC U1204 (95) in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - If the MCM was updated, troubleshooting is complete. If the MCM was substituted, replace the original MCM. If any other Temporary DTCs or DTCs were indicated in step 23, go to the indicated DTC's troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the PCM, the BCM module, and the MCM. If the MCM was updated, substitute a known-good MCM, then recheck. If the MCM was substituted, go to step 1. If the screen indicates NOT COMPLETED, keep the ignition switch ON (II) until a result comes on.