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

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

WIRING DIAGRAM

A01CI79E02

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED


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

      OK
      The connector should be securely connected.

    NG

    CONNECT CONNECTOR TO ECU CORRECTLY

    OK

  2. CHECK BATTERY


    1. Check the battery voltage.

      Standard voltage
      20 to 32 V
      Result
      Result Proceed to
      OK A
      NG (N04C-TQ) B
      NG (N04C-TW) C

    B

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    C

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    A

  3. INSPECT SKID CONTROL ECU (IG1 TERMINAL)


    1. A01CIMFE01

      Disconnect the skid control ECU connector.

    2. Turn the ignition switch to the ON position.

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      S13-7 (IG1) -Body ground Ignition switch ON 20 to 32 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

    OK

  4. INSPECT SKID CONTROL ECU (GND TERMINAL)


    1. A01CJEKE01

      Turn the ignition switch off.

    2. Disconnect the skid control ECU connectors.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      S14-2 (GND1) - Body ground Always Below 1 Ω
      S14-3 (GND2) - Body ground Always Below 1 Ω
      S11-15 (GND3) - Body ground Always Below 1 Ω
      S11-14 (GND4) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

    OK

  5. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - COMBINATION METER)


    1. A01CJHTE03

      Disconnect the combination meter connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      S13-6 (WA) - C5-40 (ESC) Always Below 1 Ω
      S13-6 (WA) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT COMBINATION METER ASSEMBLY


    1. Reconnect the skid control ECU connectors and the combination meter connector.

    2. Check the combination meter.

      OK
      The combination meter is normal.

      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 Click here.


    NG

    REPLACE COMBINATION METER ASSEMBLY

    OK

    REPLACE SKID CONTROL ECU