81-51

VSA DTC Troubleshooting: 81-51, 81-53, 81-55, 81-57

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

1. Turn the ignition switch to ON (II).

2. Clear the DTC with the HDS.

3. Test-drive the vehicle.
NOTE: Drive the vehicle on the road, not on a lift.

4. 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.


5. Turn the ignition switch to LOCK (0).

6. Disconnect the VSA modulator-control unit 36P connector. Service and Repair

7. Turn the ignition switch to ON (II).

8. Measure the voltage between body ground and the appropriate VSA modulator-control unit 36P connector terminals (see table).





Is there 0.1 V or more?
YES - Repair short to power in the wire between the appropriate wheel speed sensor and the VSA modulator-control unit.

NO - Go to step 9.






9. Turn the ignition switch to LOCK (0).

10. Reconnect the VSA modulator-control unit 36P connector.

11. Update the VSA modulator-control unit if it does not have the latest software. Testing and Inspection If the unit already has the latest software, substitute a known-good VSA modulator-control unit. Service and Repair

12. Test-drive the vehicle.
NOTE: Drive the vehicle on the road, not on a lift.

13. Check for DTCs with the HDS.

Is DTC 81-51, 81-53, 81-55, or 81-57 indicated?
YES - Check for loose terminals in the VSA modulator-control unit 36P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit, Service and Repair then retest. If the VSA modulator-control unit was substituted, go to step 1.

NO - If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit. Service and Repair If any other DTCs are indicated, go to the indicated DTCs troubleshooting.