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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Abs With EBD & BA & TRAC & VSC System - Diagnostics >> Circuit Inspection >> Always On Malfunction In Ecu VSC Warning Light Circuit >> Inspection Procedure

Inspection Procedure

  1. Is DTC output? 

    Check DTC. See steps  b-  d under PRE-CHECK.

    1. YES: Repair circuit indicated by the output code  .
    2. NO: Go to next step  .

  2. Check that the ECU connectors are securely connected to the ECU  .
    1. YES: Go to next step  .
    2. NO: Connect the connector to the ECU  .
  3. Check battery positive voltage  .

    Check the battery positive voltage.

    OK: Voltage: 10 - 14 V 

    1. OK: Go to next step  .
    2. NG: Check and repair the charging system. See  CHARGING  .

  4. Check the Tc terminal circuit. See  Tc TERMINAL CIRCUIT   .
    1. OK: Go to next step  .
    2. NG: Repair or replace the Tc terminal circuit  .
  5. Check operation of the VSC warning light  .

    In case of using the hand-held tester  :

    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch ON and push the hand-held tester main switch ON.
    3. Select the ACTIVE TEST mode on the hand-held tester.

    Check that "ON" and "OFF" of the VSC warning light can be shown on the combination meter by the hand-held tester.

    In case of not using the hand-held tester  :

    1. Turn the ignition switch OFF.
    2. Disconnect the connector from the Skid Control ECU.
    3. Turn the ignition switch ON.

    Check the VSC warning light goes off.

    1. OK: Check and replace Skid Control ECU  .
    2. NG: Go to next step  .

  6. Check for short circuit in harness and connector between combination meter and Skid Control ECU. See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  .
    1. OK: Check and replace combination meter  .
    2. NG: Repair or replace harness or connector  .
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