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DTC P1448: Intelligent Power Unit (IPU) Module Fan Problem

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

    Is the IPU module fan OK? 

    YES  -Intermittent failure, the system is OK at this time.

    NO  -Go to step  4.

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

    Is DTC P1634 indicated? 

    YES  -Do the troubleshooting for DTC P1634 (see DTC P1634: MOTOR POWER INVERTER (MPI) MODULE SIGNAL CIRCUIT MALFUNCTION  ).

    NO  -Go to step  5.

  5. Turn the ignition switch to LOCK (0).
  6. Remove the right cargo area side trim panel (see TRIM REMOVAL/INSTALLATION - CARGO AREA ).
  7. Disconnect the IPU module fan 4P connector.
  8. Turn the ignition switch to ON (II).
  9. Measure the voltage between IPU module fan 4P connector terminals No. 1 and No. 4.
    Fig 1: Measuring Voltage Between IPU Module Fan 4P Connector Terminals No. 1 And No. 4
    G06950423Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step  10.

    NO  -Go to step  21.

  10. Measure the voltage between IPU module fan 4P connector terminals No. 1 and No. 3.
    Fig 2: Measuring Voltage Between IPU Module Fan 4P Connector Terminals No. 1 And No. 3
    G06950424Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    YES  -Go to step  11.

    NO  -Go to step  22.

  11. Reconnect the IPU module fan 4P connector.
  12. Measure the voltage between IPU module fan 4P connector terminals No. 1 and No. 2.
    Fig 3: Measuring Voltage Between IPU Module Fan 4P Connector Terminals No. 1 And No. 2
    G06950425Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step  13.

    NO  -Replace the IPU module fan (see IPU MODULE FAN REPLACEMENT  ), then go to step  29.

  13. Turn the ignition switch to LOCK (0).
  14. Disconnect the IPU module fan 4P connector.
  15. Turn the battery module switch OFF (see TURNING OFF AND ON POWER TO THE HIGH VOLTAGE CIRCUIT  ).
  16. Remove the IPU cover (see IPU COVER REMOVAL/INSTALLATION  ).
  17. Remove the PCU lid, the PCU busplate, and the PCU cover (see IPU CASE REMOVAL/INSTALLATION  ).
  18. Disconnect MCM connector A (31P).
  19. Check for continuity between MCM connector terminal A25 and body ground.
    Fig 4: Checking Continuity Between MCM Connector Terminal A25 And Body Ground
    G06950426Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between the IPU module fan and the MCM (A25), then go to step  29.

    NO  -Go to step  20.

  20. Check for continuity between IPU module fan 4P connector terminal No. 2 and MCM connector terminal A25.
    Fig 5: Checking Continuity Between IPU Module Fan 4P Connector Terminal No. 2 And MCM Connector Terminal A25
    G06950427Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  38.

    NO  -Repair an open in the wire between the IPU module fan and the MCM (A25), then go to step  29.

  21. Measure the voltage between IPU module fan 4P connector terminal No. 4 and body ground.
    Fig 6: Measuring Voltage Between IPU Module Fan 4P Connector Terminal No. 4 And Body Ground
    G06950428Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Repair an open in the wire between the IPU module fan and G701 (see DRIVER'S SIDE WIRE HARNESS (BB) ), then go to step  29.

    NO  -Repair an open in the wire between the IPU module fan and MCM relay 2, then go to step  29.

  22. Turn the ignition switch to LOCK (0).
  23. Turn the battery module switch OFF (see TURNING OFF AND ON POWER TO THE HIGH VOLTAGE CIRCUIT  ).
  24. Remove the IPU cover (see IPU COVER REMOVAL/INSTALLATION  ).
  25. Remove the PCU lid, the PCU busplate, and the PCU cover (see IPU CASE REMOVAL/INSTALLATION  ).
  26. Disconnect MCM connector B (24P).
  27. Check for continuity between MCM connector terminal B1 and body ground.
    Fig 7: Checking Continuity Between MCM Connector Terminal B1 And Body Ground
    G06950429Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between the IPU module fan and the MCM (B1), then go to step  29.

    NO  -Go to step  28.

  28. Check for continuity between MCM connector terminal B1 and IPU module fan 4P connector terminal No. 3.
    Fig 8: Checking Continuity Between MCM Connector Terminal B1 And IPU Module Fan 4P Connector Terminal No. 3
    G06950430Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  38.

    NO  -Repair an open in the wire between the IPU module fan and the MCM (B1), then go to step  29.

  29. Turn the ignition switch to LOCK (0).
  30. Reconnect all connectors.
  31. Reinstall the PCU cover, the PCU busplate, and the PCU lid (see IPU CASE REMOVAL/INSTALLATION  ).
  32. 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  ).
  33. If removed, reinstall the right cargo area side trim panel (see TRIM REMOVAL/INSTALLATION - CARGO AREA ).
  34. Turn the ignition switch to ON (II).
  35. Clear the DTC with the HDS (see DTC CLEAR  ).
  36. Do the IPU MODULE FAN DRIVE in the INSPECTION MENU with the HDS.
  37. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P1448 indicated? 

    YES  -Check for poor connections or loose terminals at the IPU module fan and the MCM, 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 .

  38. Turn the ignition switch to LOCK (0).
  39. Reconnect all connectors.
  40. Reinstall the PCU cover, the PCU busplate, and the PCU lid (see IPU CASE REMOVAL/INSTALLATION  ).
  41. 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. Reinstall the right cargo area side trim panel (see TRIM REMOVAL/INSTALLATION - CARGO AREA ).
  43. 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  ).
  44. Turn the ignition switch to ON (II).
  45. Do the IPU MODULE FAN DRIVE in the INSPECTION MENU with the HDS.
  46. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P1448 indicated? 

    YES  -Check for poor connections or loose terminals at the IPU module fan 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  -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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