CAN COMMUNICATION SYSTEM (w/ VSC) Open in One Side of CAN Branch Line

DESCRIPTION

If 2 or more ECUs and/or sensors do not appear on the intelligent tester "Bus Check" screen, one side of the CAN branch wire may be open. (One side of the CANH [branch wire]/CANL [branch wire] of the ECU and/or sensor is open.)

Symptom Trouble Area
2 or more ECUs and/or sensors do not appear on intelligent tester "Bus Check" screen.

  • One side of CAN branch wire is open

  • Brake actuator assembly (skid control ECU)

  • Spiral cable (steering angle sensor)

  • Yaw rate sensor

WIRING DIAGRAM

A01DXJDE01

INSPECTION PROCEDURE

Tech Tips


  • Do not remove the ECM and No. 3 junction connector, as they are the end parts of the circuit. If removed, CAN communication will not be possible.

  • The open circuit confirmation of the ECM, No. 3 junction connector and main wire is performed when checking the CAN bus line in "How to Proceed with Troubleshooting". This inspection only has procedures for checking for an open circuit on one side of a CAN branch wire.

PROCEDURE


  1. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (SKID CONTROL ECU)


    1. Disconnect the S35 skid control ECU connector.

    2. Select "Bus Check" on the intelligent tester.

      Result
      Result Proceed to
      ABS/VSC/TRC not displayed on intelligent tester. A
      Several ECUs and sensors other than ABS/VSC/TRC not displayed on intelligent tester. B

    B

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (STEERING ANGLE SENSOR) Click here

    A

  2. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (SKID CONTROL ECU BRANCH WIRE)


    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the 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 from the negative (-) battery terminal, some systems need to be initialized after the cable is reconnected Click here.

    2. A01E0DQE08

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      S35-25 (CANH) - S35-14 (CANL) Ignition switch off 54 to 69 Ω
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

    C

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (SKID CONTROL ECU)

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

  3. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (STEERING ANGLE SENSOR)


    1. Disconnect the S37 steering angle sensor connector.

    2. Select "Bus Check" on the intelligent tester.

      Result
      Result Proceed to
      Steering Angle Sensor not displayed on intelligent tester. A
      Several ECUs and sensors other than Steering Angle Sensor not displayed on intelligent tester. B

    B

    CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (YAW RATE SENSOR BRANCH WIRE) Click here

    A

  4. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (STEERING ANGLE SENSOR BRANCH WIRE)


    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the 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 from the negative (-) battery terminal, some systems need to be initialized after the cable is reconnected Click here.

    2. A01DXETE08

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      S37-4 (CANH) - S37-3 (CANL) Ignition switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (STEERING ANGLE SENSOR)

    OK

    REPLACE SPIRAL CABLE (STEERING ANGLE SENSOR) Click here

  5. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (YAW RATE SENSOR BRANCH WIRE)


    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the 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 from the negative (-) battery terminal, some systems need to be initialized after the cable is reconnected Click here.

    2. A01DY3DE08

      Disconnect the Y1 yaw rate sensor connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      Y1-3 (CANH) - Y1-2 (CANL) Ignition switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (YAW RATE SENSOR)

    OK

    REPLACE YAW RATE SENSOR Click here