81-54

VSA DTC Troubleshooting: 81-11, 81-52, 81-54, 81-56, 81-58

DTC 81-11: Central Processing Unit (CPU) Internal Circuit Malfunction

DTC 81-52: Central Processing Unit (CPU) Internal Circuit Malfunction

DTC 81-54: Central Processing Unit (CPU) Internal Circuit Malfunction

DTC 81-56: Central Processing Unit (CPU) Internal Circuit Malfunction

DTC 81-58: 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 81-11, 81-52, 81-54, 81-56, or 81-58 indicated?
YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time.


5. 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

6. Test-drive the vehicle.
NOTE: Drive the vehicle on a straight section of road, not on a lift.

7. Check for DTCs with the HDS.

Is DTC 81-11, 81-52, 81-54, 81-56, or 81-58 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.