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Inspection Procedure

WARNING: This page is about a different car, the 2006 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT SKID CONTROL ECU CONNECTOR 
    1. Check that each ECU connector is properly installed.

      OK: Each ECU connector is properly installed. 

    NG: CONNECT CONNECTOR TO ECU CORRECTLY 

    OK: GO TO NEXT STEP 

  2. CHECK FOR DTC 
    1. Turn the ignition switch ON.
    2. Check that the VSC TRAC warning light illuminates.
    3. Check if the same DTCs are recorded.

      Result: 

      RESULT REFERENCE

      Result Proceed to
      DTC is not output A
      DTC is output B

    B: REPAIR CIRCUIT INDICATED BY OUTPUT DTC 

    A: GO TO NEXT STEP 

  3. CHECK VSC TRAC WARNING LIGHT REMAIN ON 

    NG: END 

    OK: GO TO NEXT STEP 

  4. INSPECT BATTERY 

    Result: 

    RESULT REFERENCE

    Result Proceed to
    Battery voltage is OK (when using intelligent tester) A
    Battery voltage is OK (when not using intelligent tester) B
    Battery voltage is NG C

    B: Go to step  6

    C: RECHARGE OR REPLACE BATTERY 

    A: GO TO NEXT STEP 

  5. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (VSC TRAC WARNING LIGHT) 
    1. Select the ACTIVE TEST, generate a control command, and then check that the VSC TRAC warning light operates.

      Skid control ECU assembly 

      DATA LIST

      Item Vehicle Condition / Test Details Diagnostic Note
      VSC WARN LIGHT Turn VSC warning light ON / OFF Observe combination meter

      OK: VSC TRAC warning light on or off. 

    OK: REPLACE SKID CONTROL ECU ASSEMBLY 

    NG: GO TO NEXT STEP 

  6. CHECK VSC TRAC WARNING LIGHT 
    1. Disconnect the A42 ECU connector.
    2. Turn the ignition switch ON.
    3. Using a service wire, connect terminal WA to GND3 or GND4 of the A42 ECU connector. Check the VSC TRAC warning light.

      OK: VSC TRAC warning light turns off. 

    4. Turn the ignition switch OFF.
    5. Remove the service wire.
    6. Turn the ignition switch ON. Check the VSC TRAC warning light.

      OK: VSC TRAC warning light illuminates. 

    OK: REPLACE SKID CONTROL ECU ASSEMBLY 

    NG: GO TO NEXT STEP 

  7. CHECK WIRE HARNESS (SKID CONTROL ECU ASSEMBLY - COMBINATION METER) 

    OK: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: REPLACE COMBINATION METER 

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