VEHICLE STABILITY CONTROL SYSTEM (for Hydraulic Brake Booster) ABS Warning Light Remains ON

DESCRIPTION

If any of the following is detected, the ABS warning light remains on.



Tech Tips

It may not be possible to use the intelligent tester when the skid control ECU is abnormal.

WIRING DIAGRAM

A00O6NRE01

INSPECTION PROCEDURE

Note

When replacing the master cylinder solenoid, perform calibration Click here.

PROCEDURE


  1. CHECK THAT SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED


    1. Check the skid control ECU connector connection.

      OK
      The 2 connectors are securely connected.

    NG

    CONNECT CONNECTOR TO ECU CORRECTLY

    OK

  2. CHECK DTC


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output B

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    A

  3. CHECK CAN COMMUNICATION LINE


    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. Select CAN Bus Check from the System Selection Menu screen and follow the prompts on the screen to inspect the CAN bus (for LHD: Click here, for RHD: Click here.

      OK
      CAN Bus Check indicates no malfunctions in CAN communication.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

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

    C

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

    A

  4. READ VALUE USING INTELLIGENT TESTER (IG1 VOLTAGE VALUE)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Start the engine.

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

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      IG1 Voltage Value IG1 voltage value/ Min.: 0.00 V, Max.: 20.00 V Ignition switch ON: 11 to 14 V -

    6. Check the voltage output from the skid control ECU displayed on the intelligent tester.

      OK
      The output voltage displayed on the intelligent tester is within 11 to 14 V.

    NG

    Click here

    OK

  5. CHECK TERMINAL VOLTAGE (EXI3)


    1. Disconnect the A7 skid control ECU connector.

    2. A00O4C5E32
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A7-40 (EXI3) - Body ground

      Ignition switch ON

      w/ Rear Differential Lock: Rear differential free

      		 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU EXI3 CIRCUIT) Click here

    OK

  6. READ VALUE USING INTELLIGENT TESTER (ABS WARNING LIGHT)


    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
      ABS Warning Light ABS warning light/ ON or OFF OFF -

    6. When performing the ABS Warning Light Active Test, check ABS Warning Light in the Data List Click here.

      ABS/VSC/TRC
      Tester Display Test Part Control Range Diagnostic Note
      ABS Warning Light ABS warning light Warning light ON/OFF Observe the combination meter.
      Result
      Result Proceed to
      Data List Display Data List Display when Performing Active Test ON/OFF Operation
      ON Changes between ON and OFF A
      Does not change between ON and OFF (for LHD) B
      Does not change between ON and OFF (for RHD) C
      OFF Changes between ON and OFF A
      Does not change between ON and OFF (for LHD) B
      Does not change between ON and OFF (for RHD) C

    B

    REPLACE MASTER CYLINDER SOLENOID Click here

    C

    REPLACE MASTER CYLINDER SOLENOID Click here

    A

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

  7. CHECK TERMINAL VOLTAGE (IG1)


    1. Disconnect the A7 skid control ECU connector.

    2. A00O4C5E28
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A7-46 (IG1) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (GND1, GND2 AND GND3 TERMINAL)


    1. Disconnect the A7 and A8 skid control ECU connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A7-1 (GND1) - Body ground Always Below 1 Ω
      A7-32 (GND2) - Body ground Always Below 1 Ω
      A8-4 (GND3) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    B

    REPLACE MASTER CYLINDER SOLENOID Click here

    C

    REPLACE MASTER CYLINDER SOLENOID Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  9. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU EXI3 CIRCUIT)


    1. Disconnect the A7 skid control ECU connector.

    2. Disconnect the G53 four wheel drive control ECU connector.

    3. w/ Rear Differential Lock:

      Disconnect the E2 rear differential lock detection switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A7-40 (EXI3) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (w/o Rear Differential Lock) A
      OK (w/ Rear Differential Lock) B
      NG C

    B

    INSPECT REAR DIFFERENTIAL LOCK DETECTION SWITCH (DIFFERENTIAL LOCK INDICATOR SWITCH) Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

  10. CHECK TERMINAL VOLTAGE (EXI3)


    1. Disconnect the A7 skid control ECU connector.

    2. Connect the G53 four wheel drive control ECU connector.

    3. A00O4C5E32
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A7-40 (EXI3) - Body ground Ignition switch ON 11 to 14 V
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    B

    REPLACE MASTER CYLINDER SOLENOID Click here

    C

    REPLACE MASTER CYLINDER SOLENOID Click here

    A

    REPLACE 4 WHEEL DRIVE CONTROL ECU NO.2 Click here

  11. INSPECT REAR DIFFERENTIAL LOCK DETECTION SWITCH (DIFFERENTIAL LOCK INDICATOR SWITCH)


    1. Remove the rear differential lock detection switch Click here.

    2. A00OBIXE02
      Text in Illustration
      *a

      Component without harness connected

      (Rear Differential Lock Detection Switch)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      1 (GND) - 2 (+B) Pushed in Below 1 Ω
      Not pushed in 10 kΩ or higher

    NG

    REPLACE REAR DIFFERENTIAL LOCK DETECTION SWITCH (DIFFERENTIAL LOCK INDICATOR SWITCH) Click here

    OK

  12. CHECK TERMINAL VOLTAGE (EXI3)


    1. Disconnect the A7 skid control ECU connector.

    2. Connect the G53 four wheel drive control ECU connector.

    3. A00O4C5E32
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A7-40 (EXI3) - Body ground Ignition switch ON 11 to 14 V
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    B

    REPLACE MASTER CYLINDER SOLENOID Click here

    C

    REPLACE MASTER CYLINDER SOLENOID Click here

    A

    REPLACE 4 WHEEL DRIVE CONTROL ECU NO.2 Click here