DTC 81-57

DTC 81-51: Central Processing Unit (CPU) Internal Circuit Malfunction
DTC 81-53: Central Processing Unit (CPU) Internal Circuit Malfunction
DTC 81-55: Central Processing Unit (CPU) Internal Circuit Malfunction
DTC 81-57: Central Processing Unit (CPU) Internal Circuit Malfunction
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS. Turn the ignition switch OFF, then ON (II) again.
3. Test-drive the vehicle.
4. Check for DTCs with the HDS.
Is DTC 81-51, 81-53, 81-55, or 81-57 indicated?
YES - Go to step 5.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals between the appropriate wheel sensor and the VSA modulator-control unit. Refer to intermittent failure.
5. Turn the ignition switch OFF.
6. Disconnect the VSA modulator-control unit 37P connector.
7. Turn the ignition switch ON (II).





8. Measure voltage between VSA modulator-control unit 37P connector.
Is there battery voltage?
YES - Repair short in the wire between the appropriate wheel sensor and the VSA modulator-control unit.
NO - Check for loose terminals in the VSA modulator-control unit 37P connector. If necessary, substitute a known-good VSA modulator-control unit and retest. If DTCs are not indicated, replace the VSA modulator-control unit.