| DTC 81-51: | Central Processing Unit (CPU) Internal Circuit Malfunction |
| DTC 81-55: | Central Processing Unit (CPU) Internal Circuit Malfunction |
| 1. | Turn the ignition switch ON (II). |
| 2. | Clear the DTC with the HDS. |
| 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 5. NO - Intermittent failure, the system is OK at this time. Check for loose terminals at the VSA modulator-control unit 37P connector. Refer to intermittent failures troubleshooting.n |
| 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 body ground and the appropriate VSA modulator-control unit 37P connector terminals (see table).
Is there 1 V or more? YES - Repair short to power in the wire between the appropriate wheel sensor and the VSA modulator-control unit.n 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.n |