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DTC P0A3F: Motor Rotor Position Sensor 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.
  4. Monitor the OBD STATUS for P0A3F in the DTCs MENU with the HDS.

    Does the HDS indicate FAILED? 

    YES  -Go to step  5.

    NO  -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the IMA motor rotor position sensor and the MCM. If the HDS indicates NOT COMPLETED, keep the ignition switch ON (II) until a result comes on.

  5. Turn the ignition switch to LOCK (0).
  6. Turn the battery module switch OFF (see TURNING OFF AND ON POWER TO THE HIGH VOLTAGE CIRCUIT  ).
  7. Remove the IPU cover (see IPU COVER REMOVAL/INSTALLATION  ).
  8. Remove the PCU lid, the PCU busplate, and the PCU cover (see IPU CASE REMOVAL/INSTALLATION  ).
  9. Disconnect MCM connector B (24P).
  10. Check for continuity between these MCM connector B (24P) terminals individually:
    • B6 and body ground
    • B7 and body ground
    • B15 and body ground
    • B16 and body ground
    • B23 and body ground
    • B24 and body ground
      Fig 1: Checking Continuity Between MCM Connector B (24P) Terminals
      G06950289Courtesy of AMERICAN HONDA MOTOR CO., INC.

      Is there continuity between all the connectors and body ground? 

      YES  -Go to step  11.

      NO  -Go to step  13.

  11. Disconnect the IMA motor rotor position sensor 6P connector (A).
    Fig 2: Identifying IMA Motor Rotor Position Sensor 6P Connector
    G06950290Courtesy of AMERICAN HONDA MOTOR CO., INC.
  12. Check for continuity between these MCM connector B (24P) terminals individually:
    • B6 and body ground
    • B7 and body ground
    • B15 and body ground
    • B16 and body ground
    • B23 and body ground
    • B24 and body ground
      Fig 3: Checking Continuity Between MCM Connector B (24P) Terminals
      G06950291Courtesy of AMERICAN HONDA MOTOR CO., INC.

      Is there continuity between all the connectors and body ground? 

      YES  -Repair a short to ground in the wire between the IMA motor rotor position sensor and the MCM (B6, B7, B15, B16, B23, B24), then go to step  16.

      NO  -Replace the IMA motor rotor position sensor (see IMA MOTOR ROTOR POSITION SENSOR REMOVAL/INSTALLATION  ), then go to step  16.

  13. Measure the resistance between these MCM connector B (24P) terminals individually:
    • B6 and B7
    • B15 and B16
    • B23 and B24
      Fig 4: Measuring Resistance Between MCM Connector B (24P) Terminals
      G06950292Courtesy of AMERICAN HONDA MOTOR CO., INC.

      Is there 11.0-17.4 Ω between B6 and B7, 21.6-34.40 between B15 and B16, and 19.9-31.7 Ω between B23 and B24? 

      YES  -Check for poor connections or loose terminals at the MCM, then go to step  23.

      NO  -Go to step  14.

  14. Disconnect the IMA motor rotor position sensor 6P connector (A).
    Fig 5: Identifying IMA Motor Rotor Position Sensor 6P Connector
    G06950293Courtesy of AMERICAN HONDA MOTOR CO., INC.
  15. Check for continuity between these terminals:
    • MCM connector terminal B6 and IMA motor rotor position sensor 6P terminal No. 4
    • MCM connector terminal B7 and IMA motor rotor position sensor 6P terminal No. 1
    • MCM connector terminal B15 and IMA motor rotor position sensor 6P terminal No. 6
    • MCM connector terminal B16 and IMA motor rotor position sensor 6P terminal No. 3
    • MCM connector terminal B23 and IMA motor rotor position sensor 6P terminal No. 5
    • MCM connector terminal B24 and IMA motor rotor position sensor 6P terminal No. 2
      Fig 6: Checking Continuity Between MCM Connector Terminal B6 And IMA Motor Rotor Position Sensor 6P Terminal No. 4
      G06950294Courtesy of AMERICAN HONDA MOTOR CO., INC.

      Is there continuity between all of the terminals? 

      YES  -Replace the IMA motor rotor position sensor (see IMA MOTOR ROTOR POSITION SENSOR REMOVAL/INSTALLATION  ), then go to step  16.

      NO  -Repair an open in the wire between the IMA motor rotor position sensor and the MCM (B6, B7, B15, B16, B23, B24), then go to step  16.

  16. Reconnect all connectors.
  17. Reinstall the PCU cover, the PCU busplate, and the PCU lid (see IPU CASE REMOVAL/INSTALLATION  ).
  18. 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  ).
  19. Turn the ignition switch to ON (II).
  20. Clear the DTC with the HDS (see DTC CLEAR  ).
  21. Start the engine.
  22. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0A3F indicated? 

    YES  -Check for poor connections or loose terminals at the IMA motor rotor position sensor 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 .

  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. 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  ).
  27. Start the engine.
  28. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0A3F indicated? 

    YES  -Check for poor connections or loose terminals at the IMA motor rotor position sensor 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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