81-53

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 a straight section of 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.

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 a 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. Substitute a known-good wheel speed sensor for the appropriate wheel.






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 -

Reinstall the original wheel sensor, then go to step 14.

NO -

Replace the original wheel sensor.�

14. 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.

15. Test-drive the vehicle.

NOTE: Drive the vehicle on a straight section of road, not on a lift.

16. 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.�