U1201

DTC U1201: IMA-CAN Malfunction (MCM-(Motor Control CPU)-PCM)

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 IMACANL line.

1. Turn the ignition switch ON (II) and read the HDS.

Does the HDS communicate with the IMA system?

YES - Go to step 2.

NO - Go to "IMA System Indicator Circuit Troubleshooting".

2. Clear the DTC with the HDS.
3. Check for Temporary DTCs or DTCs with the HDS.

Is DTC U1201 indicated?

YES - Go to step 4.

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

4. Check for Temporary DTCs or DTCs with the HDS again.

Are DTC U0037 and U1201 indicated at the same time?

YES - Go to troubleshooting DTC U0037.

NO - Go to step 5.

5. Check for Temporary DTCs or DTCs with the HDS again.

Are DTCU0110, U0164, and U1201 indicated at the same time?

YES - Go to step 6.

NO - Substitute a known-good MCM, then go to step 15 and recheck. If DTC U0037 is not indicated, replace the original MCM, then go to step 15.

6. Turn the ignition switch OFF.
7. Jump the SCS line with the HDS.
8. Disconnect PCM connector D (17P).
9. Remove the IPU lid.
10. Disconnect MCM connector A (31P).
11. Disconnect the A/C compressor driver 4P connector.




12. Connect between PCM connector terminal DT, D13 to body ground with a jumper wire individually.




13. Check for continuity between MCM connector terminals A6, A7 and body ground individually.

Is there continuity?

YES - Go to step 14.

NO - Repair open in the wire between the MCM (A7 (A6)*) and the PCM (D13 (D1)*), then go to step 15.




14. Check for continuity between A/C compressor driver 4P connector terminals No. 2, No. 3*, and body ground individually.

Is there continuity?

YES - Substitute a known-good MCM, then go to step 15 and recheck. If DTC U0037 is not indicated, replace the original MCM, then go to step 15.

NO - Repair open in the wire between the A/C compressor driver (No. 2 (No. 3)*) and the PCM (D13(D1)*),then go tostep15.

15. Turn the ignition switch OFF.
16. Reconnect all connectors.
17. Turn the ignition switch ON (II).
18. Reset the PCM with the HDS.
19. Do the PCM idle learn procedure.
20. Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES - If DTC U1201 is indicated, check for poor connections or loose terminals at the MCM, the A/C compressor driver and the PCM, 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.