VSA System

VSA DTC Troubleshooting: 81

DTC 81:

Modulator-Control Unit Internal Circuit Malfunction

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

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

2. Check for other system DTCs.

Is another DTC indicated?

YES -

Do the appropriate troubleshooting for the DTC.�

NO -

Go to step 3.

3. Clear the DTC with the HDS.

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

5. Test-drive the vehicle at 19 mph (30 km/h) or more.

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

6. Check for DTCs with the HDS.

Is DTC 81 indicated?

YES -

Go to step 7.

NO -

Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting.�

7. 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.

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

9. Test-drive the vehicle at 19 mph (30 km/h) or more.

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

10. Check for DTCs with the HDS.

Is DTC 81 indicated?

YES -

Check for loose terminals in the VSA modulator-control unit 47P 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.�