P1440
DTC P1440 (57): MCM Circuit MalfunctionNOTE: If the DTCs listed below are stored at the same time as DTC P1440, troubleshoot P1440 first, then recheck for those DTCs.
^ 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): MCM 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. Turn the headlights on high beam.
3. Start the engine, and let it idle 1 minute.
4. Monitor the OBD STATUS for DTC P1440 (57) in the DTCs MENU with the HDS.
Does the screen indicate FAILED?
YES - Go to step 5.
NO - If the screen indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MCM and the motor stator. If the screen indicates NOT COMPLETED, go to step 1 and recheck.
5. Turn the ignition switch OFF.
6. Turn the battery module switch OFF.
7. Check the motor power cable connection (A) at the motor stator.
Is the connection OK?
YES - Go to step 8.
NO - Repair the connection, then go to step 21.
8. Remove the IPU lid.
9. Check the MCM (A), and BCM module (B) connections.
Are the connections OK?
YES - Go to step 10.
NO - Repair the connections, then go to step 21.
10. Check the motor power cable connection at the MCM.
Is the connection OK?
YES - Go to step 11.
NO - Repair the connection, then go to step 21.
11. Raise the harness holder. Remove the PDU cover (A), and the motor power cables (B) from the MCM.
12. Check for continuity between motor power cables A and B, B and C, and C and A.
Is there continuity?
YES - Go to step 15.
NO - Go to step 13.
13. Disconnect the motor power cable connector (A).
14. Check for continuity between motor power cable terminals A and B, B and C, and C and A individually.
Is there continuity?
YES - Replace the motor power cables, then go to step 21.
NO - Replace the motor stator, then go to step 21.
15. Reconnect the motor power cable connector.
16. Start the engine, and let it idle. Then measure voltage between these terminals with an AC voltmeter:
^ 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 35 - 63 V?
YES - Go to step 29.
NO - Go to step 17.
17. Turn the ignition switch OFF.
18. Remove the motor power cable from the MCM.
19. Turn the ignition switch ON (II).
20. Check for continuity between 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 MCM, then go to step 21.
NO - Replace the motor rotor, then go to step 21.
21. Turn the ignition switch OFF.
22. Reconnect all connectors.
23. Reinstall the IPU lid, then turn the battery module switch ON.
24. Turn the ignition switch ON (II).
25. Reset the BCM with the HDS.
26. Turn the headlights on high beam.
27. Start the engine, and let it idle 1 minute.
28. Check for IMA system Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P1440 (57) is indicated, check for poor connections or loose terminals at the MCM and the motor stator, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO - Go to step 29.
29. Monitor the OBD STATUS for DTC P1440 (57) in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - Troubleshooting is complete.
NO - If the screen indicates FAILED, check for poor connections or loose terminals at the MCM and the motor stator, then go to step 1. If the screen indicates NOT COMPLETED, go to step 26 and recheck.
30. Reinstall the IPU lid, then turn the battery module switch ON.
31. Update the MCM if it does not have the latest software, or substitute a known-good MCM.
32. Turn the headlights on high beam.
33. Start the engine, and let it idle 1 minute.
34. Check for IMA system Temporary DTCs or DTCs with the HDS.
Is DTC P1440 (57) indicated?
YES - Check for poor connections or loose terminals at the MCM and the motor stator. If the MCM was updated, substitute a known-good MCM and motor starter, then go to step 32. If the MCM was substituted, go to step 1.
NO - If no Temporary DTCs or DTCs are indicated, go to step 35. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
35. Monitor the OBD STATUS for DTC P1440 (57) 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.
NO - If the screen indicates FAILED, check for poor connections or loose terminals at the MCM and the motor stator, then go to step 1. If the screen indicates NOT COMPLETED, go to step 32.