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DTC P1634: Motor Power Inverter (MPI) Module Signal 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. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P1634 indicated? 

    YES  -Go to step  4.

    NO  -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MCM and the MPI module.

  4. Do the IPU MODULE FAN DRIVE in the INSPECTION MENU with the HDS.

    Does the HDS indicate OUT OF RANGE? 

    YES  -Go to step  5.

    NO  -If the HDS indicates CONDITION IS NORMAL, go to step  15.

  5. Check the No. B53 + B IMA 2 (15 A) fuse in the under-dash fuse/relay box.

    Is the fuse OK? 

    YES  -Go to step  6.

    NO  -Repair a short to ground in the wire between the IPU module fan or the MPI module and the No. B53 + B IMA 2 (15 A) fuse. Also replace the No. B53 + B IMA 2 (15 A) fuse, then go to step  39.

  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. Turn the ignition switch to ON (II), and listen for a clicking sound from MCM relay 2 (A).
    Fig 1: Identifying MCM Relay 2 Components Location
    G06950461Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there a clicking sound? 

    YES  -Go to step  10.

    NO  -Go to step  27.

  10. Turn the ignition switch to LOCK (0).
  11. Remove MCM relay 2 (A).
    Fig 2: Identifying MCM Relay 2 Components Location
    G06950462Courtesy of AMERICAN HONDA MOTOR CO., INC.
  12. Test MCM relay 2 (see POWER RELAY TEST ).

    Is the relay OK? 

    YES  -Go to step  13.

    NO  -Replace MCM relay 2, then go to step  39.

  13. Turn the ignition switch to ON (II).
  14. Measure the voltage between IPU relay holder (MCM relay 2) 8P connector terminal No. 2 and body ground.
    Fig 3: Measuring Voltage Between IPU Relay Holder (MCM Relay 2) 8P Connector Terminal No. 2 And Body Ground
    G06950463Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Repair an open in the wire between MCM relay 2 and MPI module 12P connector terminal No. 7, then go to step  39.

    NO  -Repair an open in the wire between the No. B53 + B IMA 2 (15 A) fuse and MCM relay 2, then go to step  39.

  15. Turn the ignition switch to LOCK (0).
  16. Turn the battery module switch OFF (see TURNING OFF AND ON POWER TO THE HIGH VOLTAGE CIRCUIT  ).
  17. Remove the IPU cover (see IPU COVER REMOVAL/INSTALLATION  ).
  18. Remove the PCU lid, the PCU busplate, and the PCU cover (see IPU CASE REMOVAL/INSTALLATION  ).
  19. Disconnect MCM connector C (22P).
  20. Measure the resistance between MCM connector terminal C18 and body ground.
    Fig 4: Measuring Resistance Between MCM Connector Terminal C18 And Body Ground
    G06950464Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 1 MΩ or more? 

    YES  -Go to step  21.

    NO  -Go to step  36.

  21. Disconnect the MPI module 12P connector (A).
    Fig 5: Identifying MPI Module 12P Connector Components Location
    G06950465Courtesy of AMERICAN HONDA MOTOR CO., INC.
  22. Reconnect MCM connector C (22P).
  23. Turn the ignition switch to ON (II).
  24. Measure the voltage between MPI module 12P connector terminals No. 7 and No. 12.
    Fig 6: Measuring Voltage Between MPI Module 12P Connector Terminals No. 7 And No. 12
    G06950466Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 12 V? 

    YES  -Go to step  25.

    NO  -Go to step  38.

  25. Measure the voltage between MPI module 12P connector terminal No. 2 and body ground.
    Fig 7: Measuring Voltage Between MPI Module 12P Connector Terminal No. 2 And Body Ground
    G06950467Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 12 V? 

    YES  -Replace the MPI module (see MOTOR POWER INVERTER (MPI) MODULE REMOVAL/INSTALLATION  ), then go to step  39.

    NO  -Go to step  26.

  26. Measure the voltage between MCM connector terminal C18 and body ground.
    Fig 8: Measuring Voltage Between MCM Connector Terminal C18 And Body Ground
    G06950468Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 12 V? 

    YES  -Repair an open in the wire between the MPI module 12P connector and the MCM (C18), then go to step  39.

    NO  -Go to step  45.

  27. Turn the ignition switch to LOCK (0).
  28. Remove MCM relay 2 (A).
    Fig 9: Identifying MCM Relay 2 Components Location
    G06950469Courtesy of AMERICAN HONDA MOTOR CO., INC.
  29. Test MCM relay 2 (see POWER RELAY TEST ).

    Is the relay OK? 

    YES  -Go to step  30.

    NO  -Replace MCM relay 2, then go to step  39.

  30. Turn the ignition switch to ON (II).
  31. Measure the voltage between IPU relay holder (MCM relay 2) 8P connector terminal No. 3 and body ground.
    Fig 10: Measuring Voltage Between IPU Relay Holder (MCM Relay 2) 8P Connector Terminal No. 3 And Body Ground
    G06950470Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 12 V? 

    YES  -Go to step  32.

    NO  -Repair an open in the wire between MCM relay 1 and MCM relay 2, then go to step  39.

  32. Turn the ignition switch to LOCK (0).
  33. Reinstall MCM relay 2 (A).
    Fig 11: Identifying MCM Relay 2 Components Location
    G06950471Courtesy of AMERICAN HONDA MOTOR CO., INC.
  34. Turn the ignition switch to ON (II).
  35. Measure the voltage between MCM connector terminal A4 and body ground.
    Fig 12: Measuring Voltage Between MCM Connector Terminal A4 And Body Ground
    G06950472Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 12 V? 

    YES  -Go to step  45.

    NO  -Repair an open in the wire between MCM relay 2 and the MCM (A4), then go to step  39.

  36. Disconnect the MPI module 12P connector (A).
    Fig 13: Identifying MPI Module 12P Connector Components Location
    G06950473Courtesy of AMERICAN HONDA MOTOR CO., INC.
  37. Check for continuity between MCM connector terminal C18 and body ground.
    Fig 14: Checking Continuity Between MCM Connector Terminal C18 And Body Ground
    G06950474Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between the MPI module 12P connector and the MCM (C18), then go to step  39.

    NO  -Replace the MPI module (see MOTOR POWER INVERTER (MPI) MODULE REMOVAL/INSTALLATION  ), then go to step  39.

  38. Measure the voltage between MPI module 12P connector terminal No. 7 and body ground.
    Fig 15: Measuring Voltage Between MPI Module 12P Connector Terminal No. 7 And Body Ground
    G06950475Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Repair an open in the wire between MPI module 12P connector terminal No. 12 and G901 (see IMA MOTOR POWER CABLE (CARGO AREA BRANCH) (IA) ), then go to step  39.

    NO  -Repair an open in the wire between MCM relay 2 and MPI module 12P connector terminal No. 7, then go to step  39.

  39. Reconnect all connectors.
  40. If removed, reinstall the PCU cover, the PCU busplate, and the PCU lid (see IPU CASE REMOVAL/INSTALLATION  ).
  41. If removed, 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  ).
  42. Turn the ignition switch to ON (II).
  43. Clear the DTC with the HDS (see DTC CLEAR  ).
  44. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P1634 indicated? 

    YES  -Check for poor connections or loose terminals at the MCM and the MPI module, then go to step  1.

    NO  -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC'S TROUBLESHOOTING .

  45. Reconnect all connectors.
  46. Reinstall the PCU cover, the PCU busplate, and the PCU lid (see IPU CASE REMOVAL/INSTALLATION  ).
  47. 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  ).
  48. 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  ).
  49. Turn the ignition switch to ON (II).
  50. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P1634 indicated? 

    YES  -Check for poor connections or loose terminals at the MCM and the MPI module. 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  -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, go to the indicated DTC'S TROUBLESHOOTING .

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