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DTC 51-12: Motor Drive 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  ).
  1. Turn the ignition switch to ON (II).
  2. Clear the DTC with the HDS.
  3. Turn the ignition switch to LOCK (0) and then back to ON (II).
  4. Check for DTCs with the HDS.

    Is DTC 51-12 indicated? 

    YES  -Go to step 5.

    NO  -Intermittent failure, the system is OK at this time. Refer to INTERMITTENT FAILURES TROUBLESHOOTING 

  5. Turn the ignition switch to LOCK (0).
  6. Check the No. 58 (30 A) fuse in the under-dash fuse/relay box.

    Is the fuse blown? 

    YES  -Go to step 7.

    NO  -Reinstall the checked fuse, then go to step  14.

  7. Disconnect the VSA modulator-control unit 36P connector (see step  3 ).
  8. Check for continuity between VSA modulator-control unit 36P connector terminal No. 13 and body ground.
    Fig 1: Checking Continuity Between VSA Modulator-Control Unit 36P Connector Terminal No. 13 And Body Ground
    G08083001Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short to body ground in the wire between the No. 58 (30 A) fuse in the under-dash fuse/relay box and the VSA modulator-control unit.

    NO  -Install a new No. 58 (30 A) fuse in the under-dash fuse/relay box, then go to step 9.

  9. Reconnect the VSA modulator-control unit 36P connector.
  10. Turn the ignition switch to ON (II).
  11. Clear the DTC with the HDS.
  12. Turn the ignition switch to LOCK (0) and then back to ON (II).
  13. Check for DTCs with the HDS.

    Is DTC 51-12 indicated? 

    YES  -Replace the VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION  ).

    NO  -The troubleshooting is complete.

  14. Disconnect the VSA modulator-control unit 36P connector (see step  3 ).
  15. Measure the voltage between VSA modulator-control unit 36P connector terminal No. 13 and body ground.
    Fig 2: Measuring Voltage Between VSA Modulator-Control Unit 36P Connector Terminal No. 13 And Body Ground
    G08083002Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 16.

    NO  -Repair an open in the wire between the No. 58 (30 A) fuse in the under-dash fuse/relay box and the VSA modulator-control unit.

  16. Reconnect the VSA modulator-control unit 36P connector.
  17. Update the VSA modulator-control unit if it does not have the latest software (see VSA MODULATOR-CONTROL UNIT UPDATE  ).
  18. Turn the ignition switch to LOCK (0) and then back to ON (II).
  19. Check for DTCs with the HDS.

    Is DTC 51-12 indicated? 

    YES  -Check for loose terminals in the VSA modulator-control unit 36P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see WHEEL SPEED SENSOR REPLACEMENT  ).

    NO  -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCS TROUBLESHOOTING .

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