VEHICLE STABILITY CONTROL SYSTEM TRC OFF Indicator Light Remains ON

DESCRIPTION

The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication.

for Segment Display Type:

Pressing the VSC OFF switch (traction control switch) turns off traction control and pressing and holding this switch turns off traction and VSC controls. If traction control turns OFF, the TRC/TRAC OFF indicator light will come on.

If VSC and traction control turns OFF, the TRC/TRAC OFF indicator and VSC OFF indicator light will come on.

The TRC/TRAC OFF indicator light is illuminated when the TRC/TRAC control is prohibited by operating the VSC OFF switch (traction control switch).

By pressing the VSC OFF switch (traction control switch) for a short time, the TRC/TRAC OFF mode is activated, and the TRC/TRAC control is prohibited, and the TRC/TRAC OFF indicator light in the combination meter is illuminated.

By pressing the VSC OFF switch (traction control switch) for 3 seconds or more, the VSC OFF mode is activated, the VSC and TRC/TRAC controls are prohibited, and both the VSC OFF indicator light and the TRC/TRAC OFF indicator light are illuminated.

If there is a malfunction in the SFI system, the TRC/TRAC system will be prohibited and the TRC/TRAC OFF indicator light will turn on (for 2AR-FE, 3ZR-FE).

for Dot Display Type:

Pressing the VSC OFF switch (traction control switch) turns off traction control and pressing and holding this switch turns off traction and VSC controls. If traction control turns OFF, TRC OFF is displayed on the multi-information display.

If VSC and traction control turns OFF, TRC OFF is displayed on the multi-information display and the VSC OFF indicator light will come on.

TRC OFF is displayed on the multi-information display when the TRC control is prohibited by operating the VSC OFF switch (traction control switch).

By pressing the VSC OFF switch (traction control switch) for a short time, the TRC OFF mode is activated, TRC control is prohibited, and TRC OFF is displayed on the multi-information display.

By pressing the VSC OFF switch (traction control switch) for 3 seconds or more, the VSC OFF mode is activated, VSC and TRC controls are prohibited, the VSC OFF indicator light illuminates and TRC OFF is displayed on the multi-information display.

If there is a malfunction in the SFI system, the TRC system will be prohibited and the TRC OFF will be displayed on the multi-information display (for 2AR-FE, 3ZR-FE, 3ZR-FAE).

WIRING DIAGRAM

A01KCKLE02

CAUTION / NOTICE / HINT

Note

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration.

Click here

PROCEDURE


  1. CHECK ENGINE TYPE


    1. Check the engine type.

      Result
      Result Proceed to
      2AR-FE A
      3ZR-FAE
      3ZR-FE
      1AD-FTV B
      2AD-FHV
      2AD-FTV

    B

    GO TO STEP 3 Click here

    A

  2. CHECK SFI SYSTEM


    1. Check if SFI system DTCs are output

      for 2AR-FE (w/ Canister Pump Module): Click here

      for 2AR-FE (w/o Canister Pump Module): Click here

      for 3ZR-FAE: Click here

      for 3ZR-FE: Click here


      Powertrain > Engine and ECT > Trouble Codes
      Result
      Proceed to
      DTCs are not output
      DTCs are output (for 2AR-FE (w/ Canister Pump Module))
      DTCs are output (for 2AR-FE (w/o Canister Pump Module))
      DTCs are output (for 3ZR-FAE)
      DTCs are output (for 3ZR-FE)

    DTCs are output (for 2AR-FE (w/ Canister Pump Module))

    CHECK SFI SYSTEM Click here

    DTCs are output (for 2AR-FE (w/o Canister Pump Module))

    CHECK SFI SYSTEM Click here

    DTCs are output (for 3ZR-FAE)

    CHECK SFI SYSTEM Click here

    DTCs are output (for 3ZR-FE)

    CHECK SFI SYSTEM Click here

    DTCs are not output

  3. CHECK IF SKID CONTROL ECU CONNECTOR SECURELY CONNECTED


    1. Check if the skid control ECU (brake actuator assembly) connector is securely connected.

      OK
      The connector is securely connected.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT CONNECTOR TO ECU CORRECTLY

    OK

  4. CHECK CAN COMMUNICATION SYSTEM


    1. Check if CAN communication system DTCs are output.

      for LHD: Click here

      for RHD: Click here

      Result
      Proceed to
      DTC is not output
      DTC is output (for LHD)
      DTC is output (for RHD)

    DTC is output (for LHD)

    CHECK CAN COMMUNICATION SYSTEM Click here

    DTC is output (for RHD)

    CHECK CAN COMMUNICATION SYSTEM Click here

    DTC is not output

  5. INSPECT BATTERY


    1. Check the battery voltage.

      Standard voltage
      11 to 14 V
      Result
      Proceed to
      OK
      NG (for 1AD-FTV)
      NG (for 2AD-FHV)
      NG (for 2AD-FTV)
      NG (for 2AR-FE)
      NG (for 3ZR-FAE)
      NG (for 3ZR-FE)

    NG (for 1AD-FTV)

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    NG (for 2AD-FHV)

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    NG (for 2AD-FTV)

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    NG (for 2AR-FE)

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    NG (for 3ZR-FAE)

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    NG (for 3ZR-FE)

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (CSW TERMINAL)


    1. Turn the ignition switch off.

    2. Disconnect the A64 skid control ECU (brake actuator assembly) connector.

    3. A01KAJTC58
      *a

      Front view of wire harness connector

      (to Skid Control ECU [Brake Actuator Assembly])

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A64-30 (CSW) - Body ground VSC OFF switch held on Below 1 Ω
      A64-30 (CSW) - Body ground VSC OFF switch off (Not pressed) 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT TRACTION CONTROL SWITCH Click here

    OK

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


    1. Reconnect the A64 skid control ECU (brake actuator assembly) connector.

    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.

    6. According to the display on the GTS, read the Data List.


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

      Normal: Normal mode

      TRC OFF: TRC/TRAC off mode

      VSC OFF: VSC off mode

      		 Unknown: Unspecified

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      TRC/VSC Off Mode

    7. Check that the mode display changes according to the VSC OFF switch (traction control switch) operation.

      OK
      Display changes according to the switch operation.
      Result
      Proceed to
      OK
      NG

    OK

    INSPECT METER / GAUGE SYSTEM Click here

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  8. INSPECT TRACTION CONTROL SWITCH


    1. Remove the VSC OFF switch (traction control switch).

      Click here

    2. Inspect the VSC OFF switch (traction control switch).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE TRACTION CONTROL SWITCH Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - TRACTION CONTROL SWITCH)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A64-30 (CSW) - G51-6 (+) Always Below 1 Ω
      G51-3 (E) - Body ground Always Below 1 Ω
      A64-30 (CSW) or G51-6 (+) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR