CAN COMMUNICATION SYSTEM Skid Control ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
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 (Skid Control ECU)

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

  • Brake actuator assembly (Skid Control ECU)

WIRING DIAGRAM

B007PEZE01
B007PEZE02

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. 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:

      For vehicles with an airbag system:

      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

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


    1. B007QCHE01
      Text in Illustration
      *A w/ VSC
      *B w/o VSC
      *a

      Front view of wire harness connector

      (to Brake Actuator Assembly [Skid Control ECU])

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

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

      Standard Resistance
      w/ VSC
      Tester Connection Switch Condition Specified Condition
      B92-22 (CANH) - B92-10 (CANL) Ignition switch off 54 to 69 Ω
      w/o VSC
      Tester Connection Switch Condition Specified Condition
      B19-6 (CANH) - B19-5 (CANL) Ignition switch off 54 to 69 Ω

    NG

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

    OK

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


    1. B007QCHE02
      Text in Illustration
      *A w/ VSC
      *B w/o VSC
      *a

      Front view of wire harness connector

      (to Brake Actuator Assembly [Skid Control ECU])

      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
      w/ VSC
      Tester Connection Condition Specified Condition
      B92-1 (GND2) - Body ground Always Below 1 Ω
      B92-25 (GND1) - Body ground Always Below 1 Ω
      w/o VSC
      Tester Connection Condition Specified Condition
      B19-2 (GND) - Body ground Always Below 1 Ω
      B19-24 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      w/ VSC
      Tester Connection Condition Specified Condition
      B92-13 (+BM) - Body ground Always 11 to 14 V
      B92-38 (+BS) - Body ground Always 11 to 14 V
      B92-12 (IG1) - Body ground Ignition switch ON 11 to 14 V
      w/o VSC
      Tester Connection Condition Specified Condition
      B19-23 (+BM) - Body ground Always 11 to 14 V
      B19-1 (+BS) - Body ground Always 11 to 14 V
      B19-25 (IG1) - Body ground Ignition switch ON 11 to 14 V
      Result
      Result Proceed to
      OK (w/ VSC) A
      OK (w/o VSC) B
      NG C

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here