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VSA DTC Troubleshooting: 81-51, 81-53, 81-55, 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 to ON (II).
  1. Clear the DTC with the HDS.
  1. Test-drive the vehicle.
    NOTE: Drive the vehicle on a straight section of road, not on a lift.
  1. 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, the system is OK at this time.■
  1. Turn the ignition switch to LOCK (0).
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage between body ground and the appropriate VSA modulator-control unit 36P connector terminals (see table).
    DTC
    VSA Modulator-control Unit 36P Connector Terminal
    81-51
    No. 23
    81-53
    No. 19
    81-55
    No. 18
    81-57
    No. 21

Is there 0.1 V or more?
YES -
Repair short to power in the wire between the appropriate wheel speed sensor and the VSA modulator-control unit.■
NO -
Go to Step 9 .
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect the VSA modulator-control unit 36P connector.
  1. Test-drive the vehicle.
    NOTE: Drive the vehicle on a straight section of road, not on a lift.
  1. Check for DTCs with the HDS.
Is DTC 81-51, 81-53, 81-55, or 81-57 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.■