81-07

VSA DTC Troubleshooting: 81-07

DTC 81-07:

Central Processing Unit (CPU) Internal Circuit Malfunction

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

2. Clear the DTC with the HDS.

3. Turn the ignition switch to LOCK (0) and then back to ON (II).

4. Check for DTCs with the HDS.

Is DTC 81-07 indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time. Check for loose terminals between the steering angle sensor 5P connector and the VSA modulator-control unit 36P connector. Refer to intermittent failures troubleshooting Reading and Clearing Diagnostic Trouble Codes.�

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

6. Disconnect the steering angle sensor 5P connector Service and Repair.

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

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

9. Measure the voltage between steering angle sensor 5P connector terminal No. 5 and body ground.





Is there 0.1 V or more?

YES -

Repair a short to power in the wire between the steering angle sensor and the VSA modulator-control unit.�

NO -

Go to step 10.

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

11. Reconnect all connectors.

12. 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.

13. Turn the ignition switch to LOCK (0) and then back to ON (II).

14. Check for DTCs with the HDS.

Is DTC 81-07 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.�