U1204 (55)

DTC U1204 (55): IMA-CAN Malfunction (PCM-BCM Module)

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 (99) indicated?

YES - Do the troubleshooting for DTC U0037 (99).

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 (55) 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, and the MCM.

5. Check for Temporary DTCs or DTCs in the IMA SYSTEM and the PGM-FI SYSTEM with the HDS.

Are DTC U1204 (95) and U0037 (PGM-FI SYSTEM) indicated?

YES - Go to step 6.

NO - Go to step 21.

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. Disconnect BCM module connector A (40P).
12. Connect BCM module connector terminals A20 and A40 to body ground with a jumper wire.






13. Check for continuity between body ground and PCM connector terminals A38 and A39 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 14.

NO - Repair open in the wire between the PCM, the BCM module (A20, A40), and the MCM (No. 1, No. 11), then go to step 14.

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

Is DTC U1204 (55) is 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 20.

20. Monitor the OBD STATUS for DTC U1204 (55) 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.

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

Is DTC U1204 (55) indicated?

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

NO - Go to step 23.

23. Monitor the OBD STATUS for DTC U1204 (55) in the DTCs MENU with the HDS. Does the screen indicate PASSED?

YES - If the BCM module was updated, troubleshooting is complete. If the BCM module was substituted, replace the original BCM module. If any other Temporary DTCs or DTCs were indicated in step 22, 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 BCM module was updated, substitute a known-good BCM module, then recheck. If the BCM module was substituted, go to step 1. If the screen indicates NOT COMPLETED keep the ignition switch ON (II) until a result comes on.