VEHICLE STABILITY CONTROL SYSTEM(for Hydraulic Brake Booster) TRC OFF Indicator Light does not Come ON

DESCRIPTION

Refer to TRC OFF Indicator Light Remains ON Click here

WIRING DIAGRAM

Refer to TRC OFF Indicator Light Remains ON Click here

CAUTION / NOTICE / HINT

Note

When replacing the skid control ECU (master cylinder solenoid), perform calibration Click here.

PROCEDURE


  1. CHECK CAN COMMUNICATION LINE


    1. Turn the ignition switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

    5. Select CAN Bus Check from the System Selection Menu screen and follow the prompts on the screen to inspect the CAN bus.

      w/ Central Gateway ECU: Click here

      w/o Central Gateway ECU: Click here

      OK
      CAN Bus Check indicates no malfunctions in CAN communication.
      Result
      Result Proceed to
      OK (w/ Combination Switch Assembly) A
      OK (w/o Combination Switch Assembly (w/ Downhill Assist Control)) B
      OK (w/o Combination Switch Assembly (w/o Downhill Assist Control)) C
      NG (w/ Central Gateway ECU) D
      NG (w/o Central Gateway ECU) E

    B

    CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - NO. 2 COMBINATION SWITCH ASSEMBLY) Click here

    C

    CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - VSC OFF SWITCH) Click here

    D

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    E

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    A

  2. CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - COMBINATION SWITCH ASSEMBLY)


    1. Disconnect the G156 VSC OFF switch (combination switch assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A7-9 (CSW) - G156-2 (OFF) Always Below 1 Ω
      A7-9 (CSW) - Body ground Always 10 kΩ or higher
      G156-24 (E) - Body ground Always Below 1 Ω

    OK

    INSPECT COMBINATION SWITCH ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - NO. 2 COMBINATION SWITCH ASSEMBLY)


    1. Disconnect the G156 VSC OFF switch (No. 2 combination switch assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A7-9 (CSW) - G156-2 (OFF) Always Below 1 Ω
      A7-9 (CSW) - Body ground Always 10 kΩ or higher
      G156-24 (E) - Body ground Always Below 1 Ω

    OK

    INSPECT NO. 2 COMBINATION SWITCH ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - VSC OFF SWITCH)


    1. Disconnect the A7 skid control ECU (master cylinder solenoid) connector.

    2. Disconnect the G226 VSC OFF switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A7-9 (CSW) - G226-5 (OFF) Always Below 1 Ω
      A7-9 (CSW) - Body ground Always 10 kΩ or higher
      G226-2 (E) - Body ground Always Below 1 Ω

    OK

    INSPECT VSC OFF SWITCH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. INSPECT COMBINATION SWITCH ASSEMBLY


    1. Remove the VSC OFF switch (combination switch assembly) Click here.

    2. B001EY5E01
      Text in Illustration
      *a

      Component without harness connected

      (VSC OFF Switch (Combination Switch Assembly))

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      2 (OFF) - 24 (E) Switch is not pushed 10 kΩ or higher
      Switch is pushed Below 1 Ω

    OK

    READ VALUE USING GTS (TRC/VSC OFF MODE) Click here

    NG

    REPLACE COMBINATION SWITCH ASSEMBLY Click here

  6. INSPECT NO. 2 COMBINATION SWITCH ASSEMBLY


    1. Remove the VSC OFF switch (No. 2 combination switch assembly) Click here.

    2. B001EY5E01
      Text in Illustration
      *a

      Component without harness connected

      (VSC OFF Switch (No. 2 Combination Switch Assembly))

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      2 (OFF) - 24 (E) Switch is not pushed 10 kΩ or higher
      Switch is pushed Below 1 Ω

    OK

    READ VALUE USING GTS (TRC/VSC OFF MODE) Click here

    NG

    REPLACE NO. 2 COMBINATION SWITCH ASSEMBLY Click here

  7. INSPECT VSC OFF SWITCH


    1. Remove the VSC OFF switch Click here.

    2. B001H82E01
      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
      5 (OFF) - 2 (E) Switch is not pushed 10 kΩ or higher
      Switch is pushed Below 1 Ω

    NG

    REPLACE VSC OFF SWITCH Click here

    OK

  8. READ VALUE USING GTS (TRC/VSC OFF MODE)


    1. Turn the ignition switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS 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.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    A

    GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    B

    REPLACE MASTER CYLINDER SOLENOID Click here

    C

    REPLACE MASTER CYLINDER SOLENOID Click here