CAN COMMUNICATION SYSTEM ABS and Traction Actuator (Skid Control ECU) Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
ABS and Traction Actuator (Skid Control ECU) Communication Stop Mode

  • "ABS/VSC/TRC" not displayed on "Communication Bus Check" screen of intelligent tester

  • Applies to "ABS and Traction Actuator (Skid Control ECU) Communication Stop Mode" in "DTC combination table"

  • Power source circuit of skid control ECU

  • Skid control ECU branch wire or connector

  • Brake actuator assembly (skid control ECU)

WIRING DIAGRAM

A0117FEE01

INSPECTION PROCEDURE

Note


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

  • Turn the ignition switch off before measuring the resistances of the CAN main wire and the CAN branch wire.

  • After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.

  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If doors need to be opened in order to check connectors, open the doors and leave them open.

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. CHECK FOR OPEN IN CAN BUS WIRE (SKID CONTROL ECU BRANCH WIRE)


    1. A01196QE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Brake Actuator Assembly (Skid Control ECU))
      *2 for LHD
      *3 for RHD

      Turn the ignition switch off.

    2. Disconnect the A16 or A17 brake actuator assembly (skid control ECU) connector.

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

      Standard Resistance
      for LHD
      Tester Connection Switch Condition Specified Condition
      A16-25 (CANH) - A16-14 (CANL) Ignition switch off 54 to 69 Ω
      for RHD
      Tester Connection Switch Condition Specified Condition
      A17-25 (CANH) - A17-14 (CANL) Ignition switch off 54 to 69 Ω

    4. Reconnect the brake actuator assembly (skid control ECU) connector.


    NG

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (CAN-H, CAN-L)

    OK

  2. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BATTERY AND BODY GROUND)


    1. A01196QE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Brake Actuator Assembly (Skid Control ECU))
      *2 for LHD
      *3 for RHD

      Disconnect the A16 or A17 brake actuator assembly (skid control ECU) connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A16-1 (GND1) - Body ground Always Below 1 Ω
      A16-13 (GND2) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      A17-1 (GND1) - Body ground Always Below 1 Ω
      A17-13 (GND2) - Body ground Always Below 1 Ω

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

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      A16-34 (IG1) - Body ground Ignition switch ON 11 to 14 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      A17-34 (IG1) - Body ground Ignition switch ON 11 to 14 V

    4. Reconnect the brake actuator assembly skid control ECU) connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here