CAN COMMUNICATION SYSTEM Brake Actuator (Skid Control ECU) Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Brake Actuator (ABS ECU) Communication Stop Mode

Either condition is met:


  • "Skid Control (ABS/VSC/TRAC)" is not displayed on "Bus Check".

  • "Brake Actuator (ABS ECU) Communication Stop Mode" in "DTC Combination Table" applies.

  • Power source or inside brake actuator assembly (ABS ECU)

  • Brake actuator assembly (ABS ECU) CAN branch wire or connector

  • Brake actuator assembly (ABS ECU)

WIRING DIAGRAM

A01IOYAE08

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE


  1. PRECAUTION

    Note

    After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.


    NEXT

  2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and CAN branch wire.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.


    NEXT

  3. CHECK FOR OPEN IN CAN BUS WIRE (BRAKE ACTUATOR CAN BRANCH WIRE)


    1. A01IQSCE04
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Brake Actuator Assembly)

      Disconnect the A53 brake actuator assembly (ABS ECU) connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A53-26 (CANH) - A53-15 (CANL) Ignition switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE BRAKE ACTUATOR CAN BRANCH WIRE OR CONNECTOR (CANH, CANL)

    OK

  4. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR - BATTERY AND BODY GROUND)


    1. A01IQSCE05
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Brake Actuator Assembly)

      Connect the cable to the negative (-) battery terminal.

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.

    2. Disconnect the A53 brake actuator assembly (ABS ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A53-1 (GND2) - Body ground Always Below 1 Ω
      A53-4 (GND1) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A53-2 (+BM) - Body ground Always 11 to 14 V
      A53-3 (+BS) - Body ground Always 11 to 14 V
      A53-18 (IG1) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY (ABS ECU) Click here