VSA System

Control System DTCs

VSA DTC Troubleshooting: 81-19, 81-20

DTC 81-19 : Yaw Rate Sensor (Inside of Modulator-Control Unit) Internal Circuit Malfunction
DTC 81-20 : Acceleration Sensor (Inside of Modulator-Control Unit) Internal Circuit Malfunction

NOTE:
* Before you troubleshoot, record all freeze data and any on-board snapshot, and review the how to troubleshoot the VSA system Reading and Clearing Diagnostic Trouble Codes.
* The yaw rate-acceleration sensor is built into the VSA modulator-control unit.
* Before troubleshooting, check the VSA modulator-control unit for proper mounting. If not properly installed the VSA modulator-control unit may set these codes.






1. Problem verification:

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

-2. Clear the DTC with the HDS.

-3. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.

-4. Check for DTCs with the HDS.






Is DTC 81-19 or 81-20 indicated?
-YES- The failure is duplicated. Go to step 2.
-NO- Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting.

2. VSA modulator-control unit check (update):

-1. Update the VSA modulator-control unit if it does not have the latest software Programming and Relearning.

-2. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.

-3. Check for DTCs with the HDS.






Is DTC 81-19 or 81-20 indicated?
-YES- Check for loose terminals in the VSA modulator-control unit 38P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit Service and Repair.
-NO- Troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.