ELECTRONICALLY CONTROLLED BRAKE SYSTEM Traction Control Switch Circuit

DESCRIPTION

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

Pressing the combination switch (traction control switch) turns off TRC operation. If TRC operation is turned off, the TRC OFF indicator light will come on.

WIRING DIAGRAM

B001LPTE68
*1 Combination Switch (Traction Control Switch)
*2 Combination Meter
*3 Brake Booster with Master Cylinder
*4 CAN Communication Line

CAUTION / NOTICE / HINT

Note

When replacing the brake booster with master cylinder (skid control ECU), perform initialization and calibration of the linear solenoid valve Click here.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if CAN communication system DTCs are output Click here.

      Result
      Result Proceed to
      DTCs are not output A
      DTCs are output B

    B
    A
  2. CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED


    1. Check if the skid control ECU connector is securely connected.

      OK
      The connector is securely connected.

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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Select the Data List on the intelligent tester Click here.

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

      Normal: Normal mode

      TRC OFF: TRC off mode

      Unknown: Unspecified

      -
    4. Check the indicator light and mode condition on the intelligent tester changes according to combination switch (traction control switch) operation.

      Standard
      Switch Operation Mode Condition Display TRC OFF Indicator Light
      Not pressed Normal Does not come on
      Pressing the combination switch (traction control switch) TRC OFF Comes on
      Result
      Result Proceed to
      Indicator light and mode condition display do not change A
      Mode condition display is normal, but indicator light does not change B
      Indicator light and mode condition display is normal C

    B
    C
    A
  4. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (TRC OFF INDICATOR LIGHT)


    1. Select the Active Test on the intelligent tester Click here.

      ABS/VSC/TRC
      Tester Display Test Part Control Range Diagnostic Note
      TRC(TRAC) OFF Indicator Light TRC OFF indicator light Indicator light ON/OFF Observe combination meter
    2. Check that the TRC OFF indicator light on the combination meter turns on or off in accordance with the intelligent tester operation.

      OK
      The TRC OFF indicator light turns on or off in accordance with the intelligent tester operation.

    NG
    OK
  5. INSPECT COMBINATION SWITCH


    1. Turn the power switch off.

    2. Inspect the combination switch (traction control switch) Click here.

      OK
      Combination switch (traction control switch) is normal.

    NG
    OK
  6. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - COMBINATION SWITCH)


    1. Disconnect the skid control ECU connector.

    2. Disconnect the combination switch (traction control switch) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A61-8 (CSW) - H72-7 (+) Always Below 1 Ω
      A61-8 (CSW) or H72-7 (+) - Body ground Always 10 kΩ or higher
      H72-14 (E) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

      Tech Tips

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step Click here.


    A
    B
    C
  7. INSPECT COMBINATION METER


    1. Perform the Active Test of the combination meter (meter CPU) using the intelligent tester Click here.

    2. Check the combination meter.

      OK
      The TRC OFF indicator light turns on or off in accordance with intelligent tester operation.
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

      Tech Tips

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the parts Click here.


    A
    B
    C