DTC 81-51: Central Processing Unit (CPU) Internal Circuit Malfunction; DTC 81-53: Central Processing Unit (CPU) Internal Circuit Malfunction; DTC 81-55: Central Processing Unit (CPU) Internal Circuit Malfunction; DTC 81-57: Central Processing Unit (CPU) Internal Circuit Malfunction
- Turn the ignition switch ON (II).
- Clear the DTC with the HDS.
- Test-drive the vehicle.
- Check for DTCs with the HDS.
Is DTC 81-51, 81-53, 81-55, or 81-57 indicated?
YES -Go to step 5.
NO -Intermittent failure, the system is OK at this time.
- Turn the ignition switch OFF.
- Disconnect the VSA modulator-control unit 37P connector.
- Turn the ignition switch ON (II).
- Measure voltage between body ground and the appropriate VSA modulator-control unit 37P connector terminals (see table).DTC AND TERMINALS REFERENCE
DTC VSA Modulator-control Unit 37P Connector Terminals No. 81-51 No. 19 81-53 No. 22 81-55 No. 9 81-57 No. 20 Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there 0.1 V or more?
YES -Repair short to power in the wire between the appropriate wheel sensor and the VSA modulator-control unit.
NO -Replace the VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ).