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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 AREAS ).
  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
    G08092853Courtesy 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. 2 and No. 4.
    Fig 2: Measuring Voltage Between IPU Module Fan 4P Connector Terminals No. 2 And No. 4
    G08092854Courtesy 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. 3 and No. 4.
    Fig 3: Measuring Voltage Between IPU Module Fan 4P Connector Terminals No. 3 And No. 4
    G08092855Courtesy 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 MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ).
  18. Disconnect MCM connector A (31P).
  19. Check for continuity between MCM connector terminal A28 and body ground.
    Fig 4: Checking Continuity Between MCM Connector Terminal A28 And Body Ground
    G08092856Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between the IPU module fan and the MCM (A28), then go to step  29.

    NO  -Go to step 20.

  20. Check for continuity between IPU module fan 4P connector terminal No. 3 and MCM connector terminal A28.
    Fig 5: Checking Continuity Between IPU Module Fan 4P Connector Terminal No. 3 And MCM Connector Terminal A28
    G08092857Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  39.

    NO  -Repair an open in the wire between the IPU module fan and the MCM (A28), then go to step  29.

  21. Measure the voltage between IPU module fan 4P connector terminal No. 1 and body ground.
    Fig 6: Measuring Voltage Between IPU Module Fan 4P Connector Terminal No. 1 And Body Ground
    G08092858Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Repair an open in the wire between the IPU module fan and G701, 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 MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ).
  26. Disconnect MCM connector B (24P).
  27. Check for continuity between MCM connector terminal B7 and body ground.
    Fig 7: Checking Continuity Between MCM Connector Terminal B7 And Body Ground
    G08092859Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between the IPU module fan and the MCM (B7), then go to step  29.

    NO  -Go to step 28.

  28. Check for continuity between MCM connector terminal B7 and IPU module fan 4P connector terminal No. 2.
    Fig 8: Checking Continuity Between MCM Connector Terminal B7 And IPU Module Fan 4P Connector Terminal No. 2
    G08092860Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  39.

    NO  -Repair an open in the wire between the IPU module fan and the MCM (B7), then go to step 29.

  29. Turn the ignition switch to LOCK (0).
  30. Reconnect all connectors.
  31. If removed, reinstall the PCU cover, the PCU busplate, and the PCU lid (see MOTOR CONTROL MODULE (MCM) 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. Reinstall the right cargo area side trim panel (see TRIM REMOVAL/INSTALLATION - CARGO AREAS ).
  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  -Go to step 38.

  38. Monitor the OBD STATUS for DTC P1448 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  37, go to the indicated DTC'S TROUBLESHOOTING .

    NO  -If the HDS indicates FAILED, check for poor connections or loose terminals at the IPU module fan and the MCM, then go to step  1. If the HDS indicates NOT COMPLETED, keep the ignition switch ON (II) until a result comes on.

  39. Turn the ignition switch to LOCK (0).
  40. Reconnect all connectors.
  41. Reinstall the PCU cover, the PCU busplate, and the PCU lid (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ).
  42. 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 ).
  43. Reinstall the right cargo area side trim panel (see TRIM REMOVAL/INSTALLATION - CARGO AREAS ).
  44. 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 ).
  45. Turn the ignition switch to ON (II).
  46. Do the IPU MODULE FAN DRIVE in the INSPECTION MENU with the HDS.
  47. 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 ), and recheck. If the MCM was substituted, go to step  1.

    NO  -Go to step 48.

  48. Monitor the OBD STATUS for DTC P1448 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 MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ). If any other Pending or Confirmed DTCs were indicated in step  47, go to the indicated DTC'S TROUBLESHOOTING .

    NO  -If the HDS indicates FAILED, 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 ), and recheck. If the MCM was substituted, go to step  1. If the HDS indicates NOT COMPLETED, keep the ignition switch ON (II) until a result comes on.

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