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DTC Troubleshooting




DTC Troubleshooting: P1440 (57)

DTC P1440:

Motor Power Inverter (MPI) Module Output Circuit Malfunction

NOTE:

- Before you troubleshoot, record all freeze data, and any on-board snapshot, and review the general troubleshooting information Initial Inspection and Diagnostic Overview.
- If the DTC cannot be cleared, do the troubleshooting for DTC U1204.

1. Turn the ignition switch to ON (II).

2. Clear the DTC with the HDS.

3. Start the engine, and let it idle for 1 minute under these conditions:

- Headlights on high beam
- Blower fan at maximum speed
- Rear window defogger on

4. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P0A3F, P0A5E, P0A5F, P0A61, P0A62, P0A64, P0A65, P0BE6, P0BEA, P0BEE, or P0BFD indicated?

YES -

Go to the indicated DTC's troubleshooting.

NO -

Go to step 5.

5. Monitor the OBD STATUS for P1440 in the DTCs MENU with the HDS.

Does the HDS indicate PASSED?

YES -

Intermittent failure, the system is OK at this time.

NO -

If the HDS indicates FAILED, go to step 6. If the HDS indicates NOT COMPLETED, go to step 3.

6. Turn the ignition switch to LOCK (0).

7. Turn the battery module switch OFF.

8. Remove the IPU cover IPU Cover Removal/Installation.

9. Remove the PCU lid Service and Repair.

10. Check the connections at the IMA motor power cables (A).





Are the connections OK?

YES -

Go to step 11.

NO -

Repair the connections, then go to step 23.

11. Remove the IMA motor power cables (A) from the phase motor current sensor.

NOTE: Check the position of the U phase, the V phase, and the W phase cables before disconnecting them.






12. Check for continuity between IMA motor power cables A and B, and then between cables A and C.





Is there continuity?

YES -

Go to step 15.

NO -

Go to step 13.

13. Disconnect the IMA motor power cable connector.

NOTE:

- Refer to Disconnecting the IMA Motor Power Cable Connector From the Motor Stator.
- If the IMA motor power cable terminals are wet, dry them with a clean shop towel. Do not use compressed air.

14. Check for continuity between IMA motor power cable terminals A and B, and then between terminals A and C.





Is there continuity?

YES -

Replace the IMA motor power cables IMA Motor Power Cable Removal/Installation, then go to step 23.

NO -

Replace the IMA motor housing IMA Motor Housing Removal/Installation, then go to step 23.

15. Reconnect the IMA motor power cable connector.

16. Remove the PCU busplate and the PCU cover Service and Repair.

17. Disconnect the MPI module 12P connector (A).






18. Disconnect MCM connector C (22P).

19. Check for continuity between these terminals:

- MCM connector terminal C8 and MPI module 12P connector terminal No. 11.
- MCM connector terminal C16 and MPI module 12P connector terminal No. 5.
- MCM connector terminal C17 and MPI module 12P connector terminal No. 10.
- MCM connector terminal C1 and MPI module 12P connector terminal No. 4.
- MCM connector terminal C9 and MPI module 12P connector terminal No. 9.
- MCM connector terminal C2 and MPI module 12P connector terminal No. 3.





Is there continuity between all of the terminals?

YES -

Go to step 20.

NO -

Repair an open in the wire between the MPI module 12P connector and the MCM (C1, C2, C8, C9, C16, C17), then go to step 23.

20. Check for continuity between these MCM connector C (22P) terminals and body ground individually:

- C1 and body ground
- C2 and body ground
- C8 and body ground
- C9 and body ground
- C16 and body ground
- C17 and body ground





Is there continuity between each terminal and body ground?

YES -

Repair a short in the wire between the MPI module 12P connector and the MCM (C1, C2, C8, C9, C16, C17), then go to step 23.

NO -

Go to step 21.

21. Reconnect MCM connector C (22P).

22. Measure the resistance between these MCM connector C (22P) terminals and body ground individually:

- C1 and body ground
- C2 and body ground
- C8 and body ground
- C9 and body ground
- C16 and body ground
- C17 and body ground





Is there about 10 kOhms between each terminal and body ground?

YES -

Replace the MPI module Service and Repair, then go to step 23.

NO -

Go to step 31.

23. Reconnect all connectors.

24. Reinstall the PCU cover, the PCU busplate, and the PCU lid Service and Repair.

25. Reinstall the IPU cover IPU Cover Removal/Installation, then turn the battery module switch ON.

26. Turn the ignition switch to ON (II).

27. Clear the DTC with the HDS.

28. Start the engine, and let it idle for 1 minute under these conditions:

- Headlights on high beam
- Blower fan at maximum speed
- Rear window defogger on

29. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P1440 indicated?

YES -

Check for poor connections or loose terminals at the MPI module, the IMA motor power cable, and the MCM, then go to step 1.

NO -

Go to step 30.

30. Monitor the OBD STATUS for P1440 in the DTCs MENU with the HDS.

Does the HDS indicate PASSED?

YES -

Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 29, go to the indicated DTC's troubleshooting.

NO -

If the HDS indicates FAILED, check for poor connections or loose terminals at the MPI module, the IMA motor power cable, and the MCM, then go to step 1. If the HDS indicates NOT COMPLETED, go to step 28.

31. Reconnect all connectors.

32. Reinstall the PCU cover, the PCU busplate, and the PCU lid Service and Repair.

33. Reinstall the IPU cover IPU Cover Removal/Installation, then turn the battery module switch ON.

34. Update the MCM if it does not have the latest software Testing and Inspection, or substitute a known-good MCM.

35. Start the engine, and let it idle for 1 minute under these conditions:

- Headlights on high beam
- Blower fan at maximum speed
- Rear window defogger on

36. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P1440 indicated?

YES -

Check for poor connections or loose terminals at the MPI module, the IMA motor power cable, 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 37.

37. Monitor the OBD STATUS for P1440 in the DTCs MENU with the HDS.

Does the HDS indicate PASSED?

YES -

If the MCM was updated, troubleshooting is complete. If the MCM was substituted, replace the original MCM Service and Repair. If any other Pending or Confirmed DTCs were indicated in step 36, go to the indicated DTC's troubleshooting.

NO -

If the HDS indicates FAILED, check for poor connections or loose terminals at the MPI module, the IMA motor power cable, 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 HDS indicates NOT COMPLETED, go to step 35.