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DTC P0A3F (89): Motor Rotor Position Sensor Circuit Malfunction

WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.
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 (55).
  1. Turn the ignition switch to ON (II).
  2. Clear the DTC with the HDS (see DTC CLEAR  ).
  3. Start the engine, and wait 30 seconds.
  4. Monitor the OBD STATUS for DTC P0A3F (89) in the DTCs MENU with the HDS.

    Does the screen indicate FAILED? 

    YES  -go to step 5.

    NO  -If the screen 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 screen indicates NOT COMPLETED, go to step  1.

  5. Turn the ignition switch to LOCK (0).
  6. Turn the battery module switch OFF (see DISCONNECTING THE MOTOR POWER CABLE CONNECTOR FROM THE MOTOR STATOR  ).
  7. Remove the IPU cover (see IPU COVER REMOVAL/INSTALLATION  ).
  8. Remove the PCU lid, the PCU busplate, and the PCU cover (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION  ).
  9. Disconnect MCM connector B (24P).
  10. Check for continuity between body ground and these MCM connector B (24P) terminals individually:
    • B1
    • B2
    • B8
    • B9
    • B17
    • B18
    Fig 1: Checking Continuity Between Body Ground And MCM Connector B (24P) Terminals
    G06429704Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    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
    G06429705Courtesy of AMERICAN HONDA MOTOR CO., INC.
  12. Check for continuity between body ground and these MCM connector B (24P) terminals individually:
    • B1
    • B2
    • B8
    • B9
    • B17
    • B18
    Fig 3: Checking Continuity Between Body Ground And MCM Connector B (24P) Terminals
    G06429706Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short to ground in the wire between the IMA motor rotor position sensor and the MCM (B1, B2, B8, B9, B17, B18), 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:
    • B1 and B2
    • B8 and B9
    • B17 and B18
    Fig 4: Measuring Resistance Between MCM Connector B (24P) Terminals
    G06429707Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 11.0-17.4 Ω (No. 1 and No. 2), 21.6- 34.4 Ω (No. 8 and No. 9), 19.9-31.7 Ω (No. 17 and No. 18)? 

    YES  -Check for poor connections or loose terminals at the MCM, then go to step  24.

    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
    G06429708Courtesy of AMERICAN HONDA MOTOR CO., INC.
  15. At the sensor side, measure the resistance between the following IMA motor rotor position sensor 6P connector terminals individually:
    • No. 1 and No. 4
    • No. 2 and No. 5
    • No. 3 and No. 6
    Fig 6: Measuring Resistance Between IMA Motor Rotor Position Sensor 6P Connector Terminals
    G06429709Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 21.4-34.2 Ω (No. 1 and No. 4), 19.7-31.5 Ω (No. 2 and No. 5), 10.8-17.2 Ω (No. 3 and No. 6)7 

    YES  -Repair an open in the wire between the IMA motor rotor position sensor and the MCM (B1, B2, B8, B9, B17, B18), 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.

  16. Reconnect all connectors.
  17. Reinstall the PCU cover, the PCU busplate, and the PCU lid (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION  ).
  18. Reinstall the IPU cover (see IPU COVER REMOVAL/INSTALLATION  ), then turn the battery module switch ON (see DISCONNECTING THE MOTOR POWER CABLE CONNECTOR FROM THE MOTOR STATOR  ).
  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 (89) 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  -go to step 23.

  23. Monitor the OBD STATUS for DTC P0A3F (89) in the DTCs MENU with the HDS.

    Does the screen indicate PASSED? 

    YES  -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 22, go to the indicated DTC's troubleshooting.

    NO  -If the screen indicates FAILED, check for poor connections or loose terminals at the IMA motor rotor position sensor and the MCM. If the screen indicates NOT COMPLETED, keep idling until a result comes on.

  24. Reconnect all connectors.
  25. Reinstall the PCU cover, the PCU busplate, and the PCU lid (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION  ).
  26. Reinstall the IPU cover (see IPU COVER REMOVAL/INSTALLATION  ), then turn the battery module switch ON (see DISCONNECTING THE MOTOR POWER CABLE CONNECTOR FROM THE MOTOR STATOR  ).
  27. 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  ).
  28. Start the engine.
  29. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0A3F (89) 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  ), and recheck. If the MCM was substituted, go to step  1.

    NO  -go to step 30.

  30. Monitor the OBD STATUS for DTC P0A3F (89) in the DTCs MENU with the HDS.

    Does the screen 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 29, go to the indicated DTC's troubleshooting.

    NO  -If the screen indicates FAILED, 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  ), and recheck. If the MCM was substituted, go to step  1. If the screen indicates NOT COMPLETED, keep idling until a result comes on.

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