CAN COMMUNICATION SYSTEM CAN Main Wire for Disconnection

DESCRIPTION

There may be an open circuit in the main wire and/or the yaw rate sensor branch wire when the resistance between terminals 10 (CANH) and 9 (CANL) of the yaw rate sensor connector is 69 Ω or higher.

Symptom Trouble Area
Resistance between terminals 10 (CANH) and 9 (CANL) of yaw rate sensor connector 69 Ω or higher.

  • CAN main wire or connector

  • CAN junction connector

  • ECM

  • Steering sensor

WIRING DIAGRAM

A0138YVE02

INSPECTION PROCEDURE

Note


  • 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 light reminder warning system is 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 CAN BUS WIRE (YAW RATE SENSOR - CAN JUNCTION CONNECTOR)


    1. A013659E03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Yaw Rate Sensor)

      Turn the ignition switch off.

    2. Disconnect the 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
      H25-2 (CANH) - H25-3 (CANL) Ignition switch off 108 to 132 Ω

      Note

      When the measured value is 132 Ω or higher and a CAN communication system diagnostic trouble code is output, there may be a fault besides disconnection of the yaw rate sensor branch wire. For that reason, troubleshooting should be performed again from "How to Proceed with Troubleshooting" Click here after repairing the trouble area.


    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO YAW RATE SENSOR (CAN-H, CAN-L)

    OK

  2. CHECK CAN MAIN WIRE OR CONNECTOR (ECM SIDE)


    1. A0138ZPE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Steering Sensor)

      Turn the ignition switch off.

    2. Disconnect the steering sensor connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      C43-10 (CANH) - C43-9 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

    REPLACE STEERING SENSOR Click here

  3. CONNECT CONNECTOR


    1. Reconnect the steering sensor connector.


    NEXT

  4. CHECK CAN MAIN WIRE OR CONNECTOR (STEERING SENSOR SIDE)


    1. A0136ABE04
      Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

      Turn the ignition switch off.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      B26-28 (CAN+) - B26-36 (CAN-) Ignition switch off 108 to 132 Ω
      Result
      Result Proceed to
      NG A
      OK B

    B

    REPLACE ECM Click here

    A

  5. CONNECT CONNECTOR


    1. Reconnect the ECM connector.


    NEXT

  6. CHECK CAN MAIN WIRE OR CONNECTOR (ECM - CAN JUNCTION CONNECTOR)


    1. Turn the ignition switch off.

    2. A0137N2E03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN Junction Connector)

      Disconnect the CAN junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A38-8 (CAN+) - A38-2 (CAN-) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (ECM - CAN JUNCTION CONNECTOR)

    OK

  7. CHECK CAN MAIN WIRE OR CONNECTOR (STEERING SENSOR - CAN JUNCTION CONNECTOR)


    1. Turn the ignition switch off.

    2. A0137N2E04
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN Junction Connector)

      Disconnect the CAN junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      C42-10 (CAN+) - C42-4 (CAN-) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (STEERING SENSOR - CAN J/C)

    OK

    REPLACE CAN JUNCTION CONNECTOR