DTC 81-59

DTC 81-3D: Central Processing Unit (CPU) Internal Circuit Malfunction

DTC 81-3E: Central Processing Unit (CPU) Internal Circuit Malfunction

DTC 81-59: Central Processing Unit (CPU) Internal Circuit Malfunction

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine.
4. Turn the steering wheel from lock-to-lock several times.
5. Check for DTCs with the HDS.

Is DTC 81-3D, 81-3E, or 81-59 indicated?

YES - Go to step 6.

NO - Intermittent failure, the system is OK at this time.
6. Update the VSA modulator-control unit if it does not have the latest software. If the unit already has the latest software, substitute a known-good VSA modulator-control unit.

7. Start the engine.
8. Turn the steering wheel from lock-to-lock several times.
9. Check for DTCs with the HDS.

Is DTC 81-3D, 81-3E, or 81-59 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, 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. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.