ANTI-LOCK BRAKE SYSTEM 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 GTS when the skid control ECU (master cylinder solenoid) is abnormal.

WIRING DIAGRAM

B001XCCE03

CAUTION / NOTICE / HINT

Note

After 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 (master cylinder solenoid) 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 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.

      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 GTS (IG1 VOLTAGE VALUE)


    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. Start the engine.

    6. 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 -

    7. Check the voltage output from the skid control ECU (master cylinder solenoid) displayed on the GTS.

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

    NG

    CHECK HARNESS AND CONNECTOR (IG1 TERMINAL) Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (P TERMINAL)


    1. Disconnect the A24 skid control ECU (master cylinder solenoid) connector.

    2. B001YFVE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU [Master Cylinder Solenoid])

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A24-14 (P) - Body ground

      Ignition switch ON

      w/ Rear Differential Lock: Rear differential free

      		 11 to 14 V

    NG

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

    OK

  6. PERFORM ACTIVE TEST USING GTS (ABS WARNING LIGHT)


    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 / Active Test.

      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.

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

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      ABS Warning Light ABS warning light/ ON or OFF

      ON: Warning light on

      OFF: Warning light off

      		 -
      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

    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

  7. CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)


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

    2. B001XVME03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Master Cylinder Solenoid))

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A24-46 (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. Turn the ignition switch off.

    2. B001Y3HE03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU [Master Cylinder Solenoid])

      Disconnect the A24 and A25 skid control ECU (master cylinder solenoid) connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A24-1 (GND1) - Body ground Always Below 1 Ω
      A24-32 (GND2) - Body ground Always Below 1 Ω
      A25-4 (GND3) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    B

    REPLACE MASTER CYLINDER SOLENOID Click here

    C

    REPLACE MASTER CYLINDER SOLENOID Click here

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


    1. Disconnect the A24 skid control ECU (master cylinder solenoid) connector.

    2. Disconnect the A27 4 wheel drive control ECU connector.

    3. w/ Rear Differential Lock:

      Disconnect the f2 rear differential lock detection switch (No. 1 transfer indicator switch) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A24-14 (P) - 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 (NO. 1 TRANSFER INDICATOR SWITCH) Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

  10. CHECK HARNESS AND CONNECTOR (P TERMINAL)


    1. Disconnect the A24 skid control ECU (master cylinder solenoid) connector.

    2. Connect the A27 4 wheel drive control ECU connector.

    3. B001YFVE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU [Master Cylinder Solenoid])

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A24-14 (P) - Body ground Ignition switch ON 11 to 14 V
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    A

    REPLACE 4 WHEEL DRIVE CONTROL ECU Click here

    B

    REPLACE MASTER CYLINDER SOLENOID Click here

    C

    REPLACE MASTER CYLINDER SOLENOID Click here

  11. INSPECT REAR DIFFERENTIAL LOCK DETECTION SWITCH (NO. 1 TRANSFER INDICATOR SWITCH)


    1. Remove the rear differential lock detection switch (No. 1 transfer indicator switch) Click here.

    2. Inspect the rear differential lock detection switch (No. 1 transfer indicator switch) Click here.


    NG

    REPLACE NO. 1 TRANSFER INDICATOR SWITCH Click here

    OK

  12. CHECK HARNESS AND CONNECTOR (P TERMINAL)


    1. Disconnect the A24 skid control ECU (master cylinder solenoid) connector.

    2. Connect the A27 4 wheel drive control ECU connector.

    3. B001YFVE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU [Master Cylinder Solenoid])

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A24-14 (P) - Body ground Ignition switch ON 11 to 14 V
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    A

    REPLACE 4 WHEEL DRIVE CONTROL ECU Click here

    B

    REPLACE MASTER CYLINDER SOLENOID Click here

    C

    REPLACE MASTER CYLINDER SOLENOID Click here