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Home >> Honda >> 2013 >> CR-Z Base, Automatic CVT Trans >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> IMA System >> DTC Troubleshooting >> DTC P1440: Motor Power Inverter (MPI) Module Output Circuit Malfunction

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 (see GENERAL TROUBLESHOOTING INFORMATION  ).
  • 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 (see DTC CLEAR  ).
  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 (see TURNING OFF AND ON POWER TO THE HIGH VOLTAGE CIRCUIT  ).
  8. Remove the IPU cover (see IPU COVER REMOVAL/INSTALLATION  ).
  9. Remove the PCU lid (see IPU CASE REMOVAL/INSTALLATION  ).
  10. Check the connections at the IMA motor power cables (A).
    Fig 1: Identifying IMA Motor Power Cables
    G06950414Courtesy of AMERICAN HONDA MOTOR CO., INC.

    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.
    Fig 2: IMA Motor Power Cables Of Phase Motor Current Sensor With Torque Specifications
    G06950415Courtesy of AMERICAN HONDA MOTOR CO., INC.
  12. Check for continuity between IMA motor power cables A and B, and then between cables A and C.
    Fig 3: Identifying IMA Motor Power Cables
    G06950416Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  15.

    NO  -Go to step  13.

  13. Disconnect the IMA motor power cable connector.
    NOTE:
  14. Check for continuity between IMA motor power cable terminals A and B, and then between terminals A and C.
    Fig 4: Identifying IMA Motor Power Cable Terminals
    G06950417Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Replace the IMA motor power cables (see IMA MOTOR POWER CABLE REMOVAL/INSTALLATION  ), then go to step  23.

    NO  -Replace the IMA motor housing (see DRAIN COVER REMOVAL/INSTALLATION  ), then go to step  23.

  15. Reconnect the IMA motor power cable connector.
  16. Remove the PCU busplate and the PCU cover (see IPU CASE REMOVAL/INSTALLATION  ).
  17. Disconnect the MPI module 12P connector (A).
    Fig 5: Identifying MPI Module 12P Connector Components Location
    G06950418Courtesy of AMERICAN HONDA MOTOR CO., INC.
  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.
      Fig 6: Checking Continuity MCM Connector Terminal C8 And MPI Module 12P Connector Terminal No. 11
      G06950419Courtesy of AMERICAN HONDA MOTOR CO., INC.

      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
      Fig 7: Checking Continuity Between MCM Connector C (22P) Terminals And Body Ground
      G06950420Courtesy of AMERICAN HONDA MOTOR CO., INC.

      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
      Fig 8: Measuring Resistance Between MCM Connector C (22P) Terminals And Body Ground
      G06950421Courtesy of AMERICAN HONDA MOTOR CO., INC.

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

      YES  -Replace the MPI module (see MOTOR POWER INVERTER (MPI) MODULE REMOVAL/INSTALLATION  ), 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 (see IPU CASE REMOVAL/INSTALLATION  ).
  25. Reinstall the IPU cover (see IPU COVER REMOVAL/INSTALLATION  ), then turn the battery module switch ON (see TURNING OFF AND ON POWER TO THE HIGH VOLTAGE CIRCUIT  ).
  26. Turn the ignition switch to ON (II).
  27. Clear the DTC with the HDS (see DTC CLEAR  ).
  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 (see IPU CASE REMOVAL/INSTALLATION  ).
  33. Reinstall the IPU cover (see IPU COVER REMOVAL/INSTALLATION  ), then turn the battery module switch ON (see TURNING OFF AND ON POWER TO THE HIGH VOLTAGE CIRCUIT  ).
  34. Update the MCM if it does not have the latest software (see MOTOR CONTROL MODULE (MCM) UPDATE  ), or substitute a known-good MCM (see SUBSTITUTING THE 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 (see SUBSTITUTING THE 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 (see IPU CASE REMOVAL/INSTALLATION  ). 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 (see SUBSTITUTING THE MCM  ), then recheck. If the MCM was substituted, go to step  1. If the HDS indicates NOT COMPLETED, go to step  35.

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