P1440

DTC P1440 (57): Motor Power Inverter (MPI) Module Output Circuit Malfunction

NOTE: If the DTCs listed below are stored at the same time as DTC P1440, troubleshoot those DTCs first, then recheck for P1440.

^ P0A5E (24), P0A5F (25): U Phase Motor Current Sensor Circuit Low/High Voltage
^ P0A61 (26), P0A62 (27): V Phase Motor Current Sensor Circuit Low/High Voltage
^ P0A64 (28), P0A65 (29): W Phase Motor Current Sensor Circuit Low/High Voltage
^ P1585 (30): Motor Current Sensor Circuit Malfunction
^ P1586 (23): Battery Current Signal Circuit Problem
^ P1437 (41): Motor Power Inverter (MPI) Module Short Circuit
^ P15A5 (85): Motor Current Sensor Circuit Malfunction
^ P15A6 (86): U Phase Motor Current Sensor Circuit Malfunction
^ P15A7 (87): V Phase Motor Current Sensor Circuit Malfunction
^ P15A8 (88): W Phase Motor Current Sensor Circuit Malfunction

1. Turn the ignition switch ON (II).
2. Reset the MCM.
3. Turn the headlights on high beam.
4. Start the engine, and let it idle 1 minute.
5. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P1440 indicated?
YES - Go to step 6.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the MPI module, the U/V/W phase motor current sensor, and the MCM.

6. Turn the ignition switch OFF.
7. Turn the battery module switch OFF.
8. Check the motor power cable connection at the motor stator.
Is the connection OK?
YES - Go to step 9.
NO - Repair the connection, then go to step 34.

9. Remove the IPU lid.
10. Check the connections at the MPI module, the U/V/W phase motor current sensors, and the MCM.
Are the connections OK?
YES - Go to step 11.
NO - Repair the connections, then go to step 34.

11. Check the motor power cable connection at the MPI module.
Is the connection OK?
YES - Go to step 12.
NO - Repair the connections, then go to step 34.

12. Disconnect MCM connector A (31P) and the MPI module connector (16P).
13. Check for continuity between body ground and MPI module 16P connector terminals No. 1, No. 2, No. 3, No. 9, No. 10, and No. 11 individually.





Is there continuity?
YES - Repair short in the wire(s) that had continuity, then go to step 34.
NO - Go to step 14.

14. Check for continuity between these terminals:
^ MCM connector terminal A3 and MPI module 16P connector terminal No. 3
^ MCM connector terminal A4 and MPI module 16P connector terminal No. 2
^ MCM connector terminal A5 and MPI module 16P connector terminal No. 1
^ MCM connector terminal A12 and MPI module 16P connector terminal No. 11
^ MCM connector terminal A13 and MPI module 16P connector terminal No. 10
^ MCM connector terminal A14 and MPI module 16P connector terminal No. 9





Is there continuity?
YES - Go to step 15.
NO - Repair open in the wire(s) that did not have continuity, then go to step 34.

15. Check for continuity between these terminals:
^ MCM connector terminals A3 and A12
^ MCM connector terminals A4 and A13
^ MCM connector terminals A5 and A14





Is there continuity?
YES - Repair short in the wire(s) that had the continuity, then go to step 34.
NO - Go to step 16.

16. Remove the motor power cables (A) from the MPI module.





17. Check for continuity between the motor power cable terminals No. 1 (A) and No. 2 (B), No. 2 (B) and No. 3 (C), No. 3 (C) and No. 1 (A) individually.





Is there continuity?
YES - Go to step 20.
NO - Go to step 18.

18. Disconnect the motor power cable (A).

NOTE: Refer to disconnecting motor power cable connector from motor stator.





19. Check for continuity between the motor power cable terminals No. 1 (A) and No. 2 (B), No. 2 (B) and No. 3 (C), No. 3 (C) and No. 1 (A) individually.





Is there continuity?
YES - Replace the motor power cable, then go to step 34,
NO - Replace the motor stator, then go to step 34.

20. Reconnect the motor power cable.
21. Connect an AC voltmeter to the terminals below, and measure voltage at the terminals with the engine at idle.
^ The U phase terminal (A) and V phase terminal (B).
^ The W phase terminal (C) and V phase terminal (B).
^ The U phase terminal (A) and W phase terminal (C).

NOTE:
^ When using clamp-type voltmeter leads, be careful not to touch any other terminals.
^ Turn the battery module switch OFF.





Is each measurement about 30 - 43 V ?
YES - Go to step 26.
NO - Go to step 22.

22. Turn the ignition switch OFF.
23. Remove the motor power cable from the MPI module.
24. Turn the ignition switch ON (II).
25. Check for continuity between the these terminals:
^ U terminal (A) (+) and junction board -terminal (D) (-)
^ V terminal (B) (+) and junction board -terminal (D) (-)
^ W terminal (C) (+) and junction board -terminal (D) (-)
^ junction board +terminal (E) (+) and U terminal (A) (-)
^ junction board +terminal (E) (+) and V terminal (B) (-)
^ junction board +terminal (E) (+) and W terminal (C) (-)

NOTE: Place the positive and negative probes of the ohmmeter as indicated by the (+) and symbols.





Is there continuity?
YES - Replace the MPI module, then go to step 34.
NO - Replace the motor rotor, then go to step 34.

26. Turn the ignition switch OFF.
27. Reinstall the IPU lid, then turn the battery module switch ON.
28. Update the MCM if it does not have the latest software, or substitute a known-good MCM.
29. Turn the ignition switch ON (II).
30. Reset the MCM.
31. Turn the headlights on high beam.
32. Start the engine, and let it idle 1 minute.
33. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P1440 indicated?
YES - Replace the MPI module, then go to step 34.
NO - If the MCM was updated, troubleshooting is complete. If the MCM was substituted, replace the original MCM.

34. Turn the ignition switch OFF.
35. Reconnect all connectors.
36. Reinstall the IPU lid, then turn the battery module switch ON.
37. Turn the ignition switch ON (II).
38. Reset the MCM.
39. Turn the headlights on high beam.
40. Start the engine, and let it idle 1 minute.
41. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P1440 is indicated, check for poor connections or loose terminals at the MPI module, the U/V/W phase motor current sensor, 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.