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

Either condition is met:


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

  • "ABS and Traction Actuator (Skid Control ECU) Communication Stop Mode" in "DTC Combination Table" applies.

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

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

  • Brake actuator assembly (VSC ECU)

WIRING DIAGRAM

A01IOYAE13

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 ASSEMBLY CAN BRANCH WIRE)


    1. A01IQ6CE04
      Text in Illustration
      *1 for AD Series Engine
      *2 for ZR Series Engine
      *3

      Front view of wire harness connector

      (to Brake Actuator Assembly)

      Disconnect the A52*1 or A54*2 brake actuator assembly (VSC ECU) connector.


      • *1: for AD Series Engine

      • *2: for ZR Series Engine

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

      Standard Resistance
      for AD Series Engine
      Tester Connection Switch Condition Specified Condition
      A52-35 (CANH) - A52-14 (CANL) Ignition switch off 54 to 69 Ω
      for ZR Series Engine
      Tester Connection Switch Condition Specified Condition
      A54-35 (CANH) - A54-14 (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 ASSEMBLY - BATTERY AND BODY GROUND)


    1. A01IQ6CE05
      Text in Illustration
      *1 for AD Series Engine
      *2 for ZR Series Engine
      *3

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

      Standard Resistance
      for AD Series Engine
      Tester Connection Condition Specified Condition
      A52-1 (GND2) - Body ground Always Below 1 Ω
      A52-4 (GND1) - Body ground Always Below 1 Ω
      for ZR Series Engine
      Tester Connection Condition Specified Condition
      A54-1 (GND2) - Body ground Always Below 1 Ω
      A54-4 (GND1) - Body ground Always Below 1 Ω

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

      Standard Voltage
      for AD Series Engine
      Tester Connection Switch Condition Specified Condition
      A52-2 (+BM) - Body ground Always 11 to 14 V
      A52-3 (+BS) - Body ground Always 11 to 14 V
      A52-28 (IG1) - Body ground Ignition switch ON 11 to 14 V
      for ZR Series Engine
      Tester Connection Switch Condition Specified Condition
      A54-2 (+BM) - Body ground Always 11 to 14 V
      A54-3 (+BS) - Body ground Always 11 to 14 V
      A54-28 (IG1) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY (VSC ECU) Click here