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VSA DTC Troubleshooting: 81-11, 81-52, 81-54, 81-56, 81-58

DTC 81-11:
 Central Processing Unit (CPU) Internal Circuit Malfunction
DTC 81-52:
 Central Processing Unit (CPU) Internal Circuit Malfunction
DTC 81-54:
 Central Processing Unit (CPU) Internal Circuit Malfunction
DTC 81-56:
 Central Processing Unit (CPU) Internal Circuit Malfunction
DTC 81-58:
 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 81-11, 81-52, 81-54, 81-56, or 81-58 indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, the system is OK at this time.■
  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 81-11, 81-52, 81-54, 81-56, or 81-58 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.■