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ELECTRONICALLY CONTROLLED BRAKE SYSTEM ABS Warning Light Remains ON

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DTC Code DTC Name
  ABS Warning Light Remains ON
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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:


Tip:

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

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

When replacing the brake booster with master cylinder (skid control ECU), perform initialization and calibration of the linear solenoid valve (Click here).

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PROCEDURE


  1. Click here

    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

  2. Click here

    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.

  3. Click here

    CHECK AUXILIARY BATTERY


    1. Check the auxiliary battery voltage.

      Standard Voltage
      11 to 14 V

  4. Click here

    INSPECT SKID CONTROL ECU (IG1 TERMINAL)


    1. A003VYDE67

      Disconnect the skid control ECU connector.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A61-16 (IG1) - Body ground Power switch on (IG) 11 to 14 V
      Table 1. Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU)

  5. Click here

    INSPECT SKID CONTROL ECU (GND TERMINAL)


    1. A003VYDE60

      Turn the power switch off.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A61-28 (GND) - Body ground Always Below 1 Ω
      A61-27 (GND2) - Body ground Always Below 1 Ω
      A61-26 (GND3) - Body ground Always Below 1 Ω
      A61-25 (GND4) - Body ground Always Below 1 Ω
      A61-24 (GND5) - Body ground Always Below 1 Ω
      A61-23 (GND6) - Body ground Always Below 1 Ω
      Table 2. Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU)

  6. Click here

    INSPECT COMBINATION METER


    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.
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C
      Tip:

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


  7. Click here

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDERClick here

  8. Click here

    INSPECT CAN COMMUNICATION SYSTEMClick here

  9. Click here

    CONNECT CONNECTOR TO ECU CORRECTLY

  10. Click here

    CHARGE OR REPLACE AUXILIARY BATTERY

  11. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

  12. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

  13. Click here

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDERClick here

  14. Click here

    REPLACE COMBINATION METERClick here