ELECTRONICALLY CONTROLLED BRAKE SYSTEM TC and CG Terminal Circuit

DESCRIPTION

Connecting terminals TC and CG of the DLC3 causes the ECU to display the DTC by blinking the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights.

WIRING DIAGRAM

A000694E08
*a Hybrid Vehicle Control ECU Assembly
*b Skid Control ECU (Brake Booster with Master Cylinder Assembly)
*c CAN Communication Line

Tech Tips

When the warning lights blink without terminals TC and CG connected, a ground short in the wiring of terminal TC of the DLC3 or an internal ground short in one or more ECUs is suspected.

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if CAN communication system DTCs are output (See page for w/ Central Gateway ECU or Click here for w/o Central Gateway ECU).

      Result
      Result Proceed to
      DTCs are not output. A
      DTCs are output (w/ Central Gateway ECU). B
      DTCs are output (w/o Central Gateway ECU). C

    B

    INSPECT CAN COMMUNICATION SYSTEM Click here

    C

    INSPECT CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK HARNESS AND CONNECTOR (TC of DLC3 - HYBRID VEHICLE CONTROL ECU ASSEMBLY)


    1. Disconnect the H212 hybrid vehicle control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H29-13 (TC) - H212-28 (TC) Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (CG of DLC3 - BODY GROUND)


    1. A00089QE02
      Text in Illustration
      *a Front view of DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H29-4 (CG) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (TC of DLC3 - BODY GROUND)


    1. A000849E01
      Text in Illustration
      *a Front view of DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H29-13 (TC) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

      Tech Tips

      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.


    A

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

    C

    REPAIR OR REPLACE WIRE HARNESS OR EACH ECU