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Home >> Honda >> 2008 >> Civic L4-1.3L Hybrid >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> U Code Charts >> U0037 >> Integrated Motor Assist >> U0037 (98)

U0037 (98)

DTC U0037 (98): IMA-CAN Malfunction (BUS-OFF (MCM))
DTC U0037 (99): IMA-CAN Malfunction (BUS- OFF (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. Clear the DTC with the HDS.
3. Check for Temporary DTCs or DTCs in the IMA SYSTEM with the HDS.

Is DTC U0037 (98 or 99) indicated in the IMA SYSTEM?

YES - Go to step 4.

NO - Intermittent failure, the system is OK at this time.

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

Is DTC U0037 indicated?

YES - Go to step 11.

NO - Go to step 5.

5. Turn the ignition switch OFF.
6. Turn the battery module switch OFF.
7. Remove the IPU lid.
8. Remove the BCM module.
9. Disconnect the MCM 2OP connector.

10. Check for continuity between these terminals:
- BCM module connector terminal A20 and MCM 2OP connector terminal No. 11.
- BCM module connector terminal A40 and MCM 2OP connector terminal No. 1.






Is there continuity?

YES -
- Go to step 37 for DTC U0037 (98).
- Go to step 42 for DTC U0037 (99).

NO - Repair open in the wire between the BCM module (A20, A40) and the MCM (No. 10, No. 201, then go to step 31.

11. Turn the ignition switch OFF.
12. Turn the battery module switch OFF.
13. Remove the IPU lid.
14. Measure resistance between BCM module connector terminals A20 and A40.






Is there 50.4 - 61.6 ohms?

YES - Repair short to ground in the wire between the MCM, the A/C compressor driver, the PCM, and BCM module connector terminal A20 or A40, then go to step 42.

NO - Go to step 15.

15. Disconnect BCM module connector A (40P).
16. Remove the BCM module, then disconnect the MCM 20P connector.
17. Jump the SCS line with the HDS.
18. Disconnect PCM connector A (44P) and the A/C compressor driver 4P connector.
19. Measure resistance between BCM module connector terminals A20 and A40.






Is there 1 ohm or less?

YES - Repair short in the wire between BCM module connector terminals A20 and A40, then go to step 31.

NO - Go to step 20.

20. Reconnect the A/C compressor driver 4P connector.
21. Measure resistance between BCM module connector terminals A20 and A40.






Is there about 2.6 kohms?

YES - Go to step 22.

NO - Replace the A/C compressor driver, then go to step 31.

22. Disconnect the A/C compressor driver 4P connector.
23. Reconnect PCM connector A (44P).
24. Measure resistance between BCM module connector terminals A20 and A40.






Is there 108 - 132 ohms?

YES - Go to step 25.

NO - Update the PCM if it does not have the latest software, or substitute a known-good PCM 11-71, then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM, then go to step 31.

25. Disconnect PCM connector A (44P).
26. Reconnect the MCM 2OP connector.
27. Measure resistance between BCM module connector terminals A20 and A40.






Is there about 26 ohms?

YES - Go to step 28.

NO - Go to step 37.

28. Disconnect the MCM 2OP connector.
29. Reconnect BCM module connector A (40P).
30. Measure resistance between BCM module connector terminals A20 and A40.






Is there 108 - 132 ohms?

YES - Go to step 31.

NO - Go to step 42.

31. Reconnect all connectors.
32. Reinstall the IPU lid, then turn the battery module switch ON.
33. Turn the ignition switch ON (II).
34. Clear the DTC with the HDS.
35. Check for Temporary DTCs or DTCs in the IMA SYSTEM with the HDS.

Is DTC U0037 (98, 99) indicated?

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

NO - Go to step 36.

36. Monitor the OBD STATUS for DTC U0037 (98,99) 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 on step 35, go to the indicated DTC's troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the BCM module, the A/C compressor driver, the PCM, 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.

37. Reconnect all connectors.
38. Reinstall the IPU lid, then turn the battery module switch ON.
39. Update the MCM if it does not have the latest software, or substitute a known-good MCM.
40. Check for Temporary DTCs or DTCs with the HDS in the IMA SYSTEM.

Is DTC U0037 (98) indicated?

YES - Check for poor connections or loose terminals at the BCM module, the A/C compressor driver, the PCM, 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 41.

41. Monitor the OBD STATUS for DTC U0037 (98) 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 40, go to the indicated DTC's troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the BCM module, the A/C compressor driver, the PCM, 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.

42. Reconnect all connectors.
43. Reinstall the IPU lid, then turn the battery module switch ON.
44. Update the BCM module if it does not have the latest software, or substitute a known-good BCM module.
45. Check for Temporary DTCs or DTCs in the IMA SYSTEM with the HDS.

Is DTC U0037 (99) indicated in the IMA SYSTEM?

YES - Check for poor connections or loose terminals at the BCM module, the A/C compressor driver, the PCM, 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 46.

46. Monitor the OBD STATUS for DTC U0037 (99) 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 45, go to the indicated DTC's troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the BCM module, the A/C compressor driver, the PCM, 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.
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