ANTI-LOCK BRAKE SYSTEM TC and CG Terminal Circuit

DESCRIPTION

Connecting terminals TC and CG of the DLC3 causes the ECU to display the DTCs by blinking the ABS warning light.

WIRING DIAGRAM

A00DTFLE02

INSPECTION PROCEDURE

Tech Tips

When the warning lights continue to blink, there may be a ground short in the wiring of terminal TC of the DLC3 or an internal ground short in one or more ECUs.

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

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

    A

  2. INSPECT DLC3


    1. A00DQ5BE21
      Text in Illustration
      *1 Front view of DLC3

      Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D8-13 (TC) - D8-4 (CG) Ignition switch ON 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (TC OF DLC3 - ECM) Click here

    OK

  3. CHECK ECM (TC OF DLC3 INPUT)


    1. A00DQ5BE21
      Text in Illustration
      *1 Front view of DLC3

      Turn the ignition switch off.

    2. Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3.

      SST
      09843-18040

    3. Turn the ignition switch to ON.

    4. Check that the MIL is blinking.

      Result
      Result Proceed to
      MIL is blinking. A
      MIL is not blinking (for 1AZ-FE). B
      MIL is not blinking (for 1ZR-FAE). C

      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.


    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  4. CHECK HARNESS AND CONNECTOR (TC OF DLC3 - ECM)


    1. A00DRJQE02
      Text in Illustration
      *1 Front view of DLC3
      *2

      Front view of wire harness connector

      (to ECM)
      *3 for 1AZ-FE
      *4 for 1ZR-FAE

      Turn the ignition switch off.

    2. Disconnect the A40 ECM connector.

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

      Standard Resistance
      for 1AZ-FE
      Tester Connection Condition Specified Condition
      D8-13 (TC) - A40-27 (TC) Always Below 1 Ω
      D8-13 (TC) - Body ground Always 10 kΩ or higher
      for 1ZR-FAE
      Tester Connection Condition Specified Condition
      D8-13 (TC) - A40-41 (TC) Always Below 1 Ω
      D8-13 (TC) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (CG OF DLC3 - BODY GROUND)


    1. A00DQ5BE22
      Text in Illustration
      *1 Front view of DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D8-4 (CG) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK ECM (TC OF DLC3 INPUT)


    1. A00DQ5BE21
      Text in Illustration
      *1 Front view of DLC3

      Turn the ignition switch off.

    2. Using SST, connect terminals TC and CG of the DLC3.

      SST
      09843-18040

    3. Turn the ignition switch to ON.

    4. Check that the check MIL is blinking.

      Result
      Result Proceed to
      MIL is blinking. A
      MIL is not blinking (for 1AZ-FE). B
      MIL is not blinking (for 1ZR-FAE). C

      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.


    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here