MCM

DTC U1204 (95): IMA-CAN Malfunction (PCM-MCM Module)
1. Turn the ignition switch ON (II).
2. Check for IMA system Temporary DTCs or DTCs 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 IMA system Temporary DTCs or DTCs with the HDS.
Is only 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 with the HDS.
Is DTC U1204 indicated?
YES - Go to step 6.
NO - Go to step 20.

6. Turn the ignition switch OFF.
7. Disconnect PCM connector A (44P).
8. Turn the battery module switch OFF.
9. Remove the IPU lid.
10. Disconnect BCM module connector A (40P).
11. Remove the BCM module, and disconnect the MCM 20P connector.
12. Connect PCM connector terminals A38 and A39 to body ground with a jumper wire.





13. 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 14.
NO - Repair open in the wire between the PCM 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. Reset the MCM with the HDS.
19. Check for IMA system Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC U1204 (95) is indicated, check for poor connections or loose terminals at the PCM, the BCM module, and the MCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO - Troubleshooting is complete.

20. Reinstall the IPU lid, then turn the battery module switch ON.
21. Update the MCM if it does not have the latest software, or substitute a known-good MCM.
22. Check for IMA system Temporary DTCs or DTCs 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 - If the MCM was updated, troubleshooting is complete. If the MCM was substituted, replace the original MCM. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.