CAN COMMUNICATION SYSTEM (w/ VSC) Check CAN Bus Lines for Short Circuit

DESCRIPTION

There may be a short circuit between the CAN bus lines when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is below 54 Ω.

Symptom Trouble Area
Resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is below 54 Ω.

  • Short between CAN bus lines

  • Brake actuator assembly (skid control ECU)

  • Spiral cable (steering angle sensor)

  • Yaw rate sensor

  • ECM

  • No. 1 junction connector

  • No. 2 junction connector

  • No. 3 junction connector

WIRING DIAGRAM

A01DXJDE01

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 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.


    NEXT

  2. CHECK FOR SHORT IN CAN BUS WIRES (DLC3 BRANCH WIRE)


    1. A01E15BE01

      Disconnect the J49 No. 3 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      J49-2 (CANH) - D1-6 (CANH) Ignition switch off Below 1 Ω
      J49-1 (CANL) - D1-14 (CANL) Ignition switch off Below 1 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3 (CANH, CANL)

    OK

  3. CONNECT CONNECTOR


    1. Reconnect the J49 No. 3 junction connector.


    NEXT

  4. CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR SIDE)


    1. A01DXSEE28

      Disconnect the J54 No. 1 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D1-6 (CANH) - D1-14 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

  5. CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - SKID CONTROL ECU)


    1. A01DZY3E05

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      J54-13 (CANH) - J54-7 (CANL) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  6. CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - ECM)


    1. A01DZY3E06

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      J54-12 (CANH) - J54-6 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

    REPLACE NO. 1 JUNCTION CONNECTOR

  7. CONNECT CONNECTOR


    1. Reconnect the J54 No. 1 junction connector.


    NEXT

  8. CHECK FOR SHORT IN CAN BUS WIRES (SKID CONTROL ECU)


    1. A01E0DQE08

      Disconnect the S35 skid control ECU connector.

    2. 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 CONNECTED TO SKID CONTROL ECU (CANH, CANL)

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

  9. CONNECT CONNECTOR


    1. Reconnect the J54 No. 1 junction connector.


    NEXT

  10. CHECK FOR SHORT IN CAN BUS WIRES (ECM)


    1. for 1KD-FTV, 2KD-FTV (w/ DPF):


      1. Disconnect the E30 ECM connector.

        A01DX67E01

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

        Standard Resistance
        Tester Connection Switch Condition Specified Condition
        E30-35 (CANH) - E30-36 (CANL) Ignition switch off 108 to 132 Ω

    2. for 1KD-FTV, 2KD-FTV (w/o DPF):


      1. Disconnect the E6 ECM connector.

        A01DYRZE03

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

        Standard Resistance
        Tester Connection Switch Condition Specified Condition
        E6-24 (CANH) - E6-23 (CANL) Ignition switch off 108 to 132 Ω

    3. for 1GR-FE:


      1. Disconnect the E13 ECM connector.

        A01E0X7E01

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

        Standard Resistance
        Tester Connection Switch Condition Specified Condition
        E13-33 (CANH) - E13-34 (CANL) Ignition switch off 108 to 132 Ω
      Result
      Result Proceed to
      OK (for 1KD-FTV) A
      OK (for 2KD-FTV) B
      OK (for 1GR-FE) C
      NG D

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    D

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (CANH, CANL)

    A

    REPLACE ECM Click here

  11. CONNECT CONNECTOR


    1. Reconnect the J54 No. 1 junction connector.


    NEXT

  12. CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - NO. 1 JUNCTION CONNECTOR)


    1. A01DVOAE02

      Disconnect the J59 No. 2 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      J59-5 (CANH) - J59-16 (CANL) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 2 JUNCTION CONNECTOR - NO. 1 JUNCTION CONNECTOR)

    OK

  13. CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR SIDE)


    1. A01DXSEE28

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D1-6 (CANH) - D1-14 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

  14. CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - YAW RATE SENSOR)


    1. A01DVOAE03

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      J59-7 (CANH) - J59-18 (CANL) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

    REPLACE NO. 2 JUNCTION CONNECTOR

  15. CONNECT CONNECTOR


    1. Reconnect the J59 No. 2 junction connector.


    NEXT

  16. CHECK FOR SHORT IN CAN BUS WIRES (YAW RATE SENSOR)


    1. A01DY3DE08

      Disconnect the Y1 yaw rate sensor connector.

    2. 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 CONNECTED TO YAW RATE SENSOR (CANH, CANL)

    OK

    REPLACE YAW RATE SENSOR Click here

  17. CONNECT CONNECTOR


    1. Reconnect the J59 No. 2 junction connector.


    NEXT

  18. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)


    1. A01DXHLE06

      Disconnect the J50 No. 3 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      J50-2 (CANH) - J50-1 (CANL) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

    OK

  19. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - STEERING ANGLE SENSOR)


    1. A01DXHLE07

      Disconnect the J51 No. 3 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      J51-2 (CANH) - J51-1 (CANL) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

    REPLACE NO. 3 JUNCTION CONNECTOR

  20. CONNECT CONNECTOR


    1. Reconnect the J50 and J51 No. 3 junction connectors.


    NEXT

  21. CHECK FOR SHORT IN CAN BUS WIRES (STEERING ANGLE SENSOR)


    1. A01DXETE08

      Disconnect the S37 steering angle sensor connector.

    2. 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 CONNECTED TO STEERING ANGLE SENSOR (CANH, CANL)

    OK

    REPLACE SPIRAL CABLE (STEERING ANGLE SENSOR) Click here