ECM/PCM
DTC Troubleshooting: U0038, U1205
DTC U0038:
IMA-CAN Malfunction (BUS-OFF)
DTC U1205:
IMA-CAN Malfunction (Powertrain Control Module (PCM)-Motor Control Module (MCM))
NOTE:
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
- If DTC U0110 is stored at the same time as DTC U0038/U1205, troubleshoot that DTC first, then recheck for DTC U0038/U1205.
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Turn the ignition switch to ON (II).
5. Check for Pending or Confirmed DTCs with the HDS.
Is DTC U0038 or U1205 indicated?
YES -
Go to step 6.
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the motor control module (MCM) and the PCM.
6. Check for DTCs in the IMA system with the HDS.
Is DTC U0038 or U1204 indicated?
YES -
Go to step 7.
NO -
Go to step 37.
7. Turn the ignition switch to LOCK (0).
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector C (49P).
10. Measure the resistance between PCM connector terminals C35 and C36.
Is there about 108-132 Ohms?
YES -
Go to step 21.
NO -
- More than 132 Ohms: Go to step 11.
- Less than 108 Ohms: Go to step 16.
11. Turn the battery module switch OFF.
12. Remove the IPU cover.
13. Remove the PCU lid, the PCU busplate, and the PCU cover.
14. Disconnect motor control module (MCM) connector A (31P).
15. Measure the resistance between PCM connector terminal C35 (C36)* and MCM connector terminal A8 (A9)* individually.
*: IMACANL line
Is there about 1.0 Ohms or less ?
YES -
Replace the MCM, then go to step 32.
NO -
Repair an open in the wires between the PCM (C35 (C36)*) and the MCM (A8 (A9)*), then go to step 32.
16. Turn the battery module switch OFF.
17. Remove the IPU cover.
18. Remove the PCU lid, the PCU busplate, and the PCU cover.
19. Disconnect motor control module (MCM) connector A (31P).
20. Measure the resistance between PCM connector terminals C35 and C36.
Is there about 1.0 Ohms or more ?
YES -
Replace the MCM then go to step 32.
NO -
Repair a short in the wires between the PCM (C35) and the MCM (A8), or between the PCM (C36) and the MCM (A9), then go to step 32.
21. Turn the battery module switch OFF.
22. Remove the IPU cover.
23. Remove the PCU lid, the PCU busplate, and the PCU cover.
24. Disconnect motor control module (MCM) connector A (31P).
25. Measure the resistance between body ground and PCM connector terminals C35 and C36 individually.
Is there about 1.0 Ohms or more ?.
YES -
Go to step 26.
NO -
Repair a short in the wires between the PCM (C35) and the MCM (A8), or between the PCM (C36) and the MCM (A9), then go to step 32.
26. Turn the ignition switch to ON (II).
27. Measure the voltage between body ground and PCM connector terminals C35 and C36 individually.
Is there voltage?
YES -
Repair a short to power in the wires between the PCM (C35) and the MCM (A8), or between the PCM (C36) and the MCM (A9), then go to step 31.
NO -
Go to step 28.
28. Turn the ignition switch to LOCK (0).
29. Reconnect PCM connector C (49P).
30. Measure the resistance between MCM connector terminals A8 and A9.
Is there about 108-132 Ohms?
YES -
Go to step 35.
NO -
Replace the PCM, then go to step 32.
31. Turn the ignition switch to LOCK (0).
32. Reconnect all connectors.
33. Turn the ignition switch to ON (II).
34. Check for Pending or Confirmed DTCs with the HDS.
Is DTC U0038 or DTC U1205 indicated?
YES -
Check for poor connections or loose terminals at the MCM and the PCM, then go to step 1.
NO -
Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
35. Reconnect all connectors.
36. Turn the ignition switch to ON (II).
37. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
38. Check for Pending or Confirmed DTCs with the HDS.
Is DTC U0038 or DTC U1205 indicated?
YES -
Check for poor connections or loose terminals at the MCM and the PCM. If the PCM was updated, substitute a known-good PCM, then recheck. If the PCM was substituted, go to step 1.
NO -
If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.