DTC Troubleshooting: 81-51, 81-53, 81-55, 81-57

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).

DTC VSA Modulator-control Unit 37P Connector Terminals No. 
81-51 No. 19 
81-53 No. 22 
81-55 No. 9 
81-57 No. 20 

 

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