VEHICLE STABILITY CONTROL SYSTEM ABS Warning Light Remains ON

DESCRIPTION

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

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


Tech Tips


  • For vehicles with the multi-information display, the master caution indicator light will come on and a check ABS message will be displayed on the multi-information display if the ABS control cannot be performed.

  • In some cases, the intelligent tester cannot be used when the skid control ECU is abnormal.

WIRING DIAGRAM

A017CHXE02

INSPECTION PROCEDURE

Note

When replacing the brake actuator assembly, perform zero point calibration Click here.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if a CAN communication system DTC is output Click here.

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

    B

    INSPECT CAN COMMUNICATION SYSTEM Click here

    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

    CONNECT CONNECTOR TO ECU CORRECTLY

    OK

  3. CHECK BATTERY


    1. Check the battery voltage.

      Standard voltage
      11 to 14 V

    NG

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY (for 2GR-FE) Click here

    OK

  4. INSPECT SKID CONTROL ECU (IG1 TERMINAL)


    1. A017EHAE43

      Disconnect the skid control ECU connector.

    2. Turn the ignition switch on (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      A24-34 (IG1) - Body ground Ignition switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

    OK

  5. INSPECT SKID CONTROL ECU (GND1 TERMINAL)


    1. A017EHAE41

      Turn the ignition switch off.

    2. 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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT)

    OK

  6. INSPECT COMBINATION METER ASSEMBLY


    1. Reconnect the skid control ECU connector.

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

    3. Check the combination meter.

      OK
      The ABS warning light turns on or off in accordance with the intelligent tester operation.

      Tech Tips

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


    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here