VEHICLE STABILITY CONTROL SYSTEM (for Vacuum Brake Booster) TRC OFF Indicator Light Remains ON

DESCRIPTION

The skid control ECU is connected to the combination meter via the CAN communication system.

Pressing the VSC OFF switch turns off traction control and pressing and holding this switch turns off traction and VSC controls. If traction control turns off, the TRC OFF indicator light comes on.

WIRING DIAGRAM

A01DO9OE01

INSPECTION PROCEDURE

Note


  • When replacing the brake actuator assembly, perform calibration Click here.

  • As there may be malfunctions in the transfer system related to when the transfer operates in L4, check the transfer system first Click here.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if CAN communication system DTCs are output (for LHD without Entry and Start System: Click here, for RHD without Entry and Start System: Click here.

      Result
      Result Proceed to
      DTC not output A
      DTC output for LHD without Entry and Start System B
      DTC output for RHD without Entry and Start System C

    B
    C
    A
  2. INSPECT VSC OFF SWITCH


    1. Remove the VSC OFF switch Click here.

    2. A01DTR9E02
      Text in Illustration
      *a

      Component without harness connected

      (VSC OFF Switch)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      6 - 3 Switch is not pushed 10 kΩ or higher
      Switch is pushed Below 1 Ω

    NG
    OK
  3. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - VSC OFF SWITCH)


    1. Disconnect the A6 skid control ECU connector.

    2. Disconnect the G9 VSC OFF switch connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A6-30 (CSW) - G9-6 Always Below 1 Ω
      A6-30 (CSW) - Body ground Always 10 kΩ or higher
      G9-3 - Body ground Always Below 1 Ω

    NG
    OK
  4. READ VALUE USING INTELLIGENT TESTER (TRC/VSC OFF MODE)


    1. Turn the ignition switch off.

    2. Connect the Intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the intelligent tester on.

    5. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      TRC/VSC Off Mode TRC/VSC off mode/ Normal, TRC OFF or VSC OFF

      Normal: Normal mode

      TRC OFF: TRC OFF mode

      VSC OFF: VSC OFF mode

      -
    6. Check that the mode display changes according to VSC OFF switch operation.

      OK
      Display changes according to switch operation.

    NG
    OK