CAN COMMUNICATION SYSTEM (w/ VSC) Check CAN Bus Line for Short to GND

DESCRIPTION

There may be a short circuit between the CAN bus lines and GND when the resistance between terminals 6 (CANH) and 4 (CG) or terminals 14 (CANL) and 4 (CG) of the DLC3 is below 200 Ω.

Symptom Trouble Area
The resistance between terminals 6 (CANH) and 4 (CG) or terminals 14 (CANL) and 4 (CG) of the DLC3 is below 200 Ω.

  • Short to GND

  • 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 TO GND IN CAN BUS WIRE (DLC3 BRANCH WIRE)


    1. A01DXSEE30

      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 Measured Resistance
      D1-6 (CANH) - D1-4 (CG) Ignition switch off 200 Ω or higher
      D1-14 (CANL) - D1-4 (CG) Ignition switch off 200 Ω or higher

    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 TO GND IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR SIDE)


    1. A01DXSEE30

      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 Measured Resistance
      D1-6 (CANH) - D1-4 (CG) Ignition switch off 200 Ω or higher
      D1-14 (CANL) - D1-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

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


    1. A01E32EE12

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

      Standard Resistance
      Tester Connection Switch Condition Measured Resistance
      J54-13 (CANH) - D1-4 (CG) Ignition switch off 200 Ω or higher
      J54-7 (CANL) - D1-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

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


    1. A01E32EE13

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

      Standard Resistance
      Tester Connection Switch Condition Measured Resistance
      J54-12 (CANH) - D1-4 (CG) Ignition switch off 200 Ω or higher
      J54-6 (CANL) - D1-4 (CG) Ignition switch off 200 Ω or higher

    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 TO GND IN CAN BUS WIRE (SKID CONTROL ECU)


    1. A01DYNXE02

      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 Measured Resistance
      S35-25 (CANH) - D1-4 (CG) Ignition switch off 200 Ω or higher
      S35-14 (CANL) - D1-4 (CG) Ignition switch off 200 Ω or higher
      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 TO GND IN CAN BUS WIRE (ECM)


    1. A01DWOKE02

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


      1. Disconnect the E30 ECM connector.

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

        Standard Resistance
        Tester Connection Switch Condition Measured Resistance
        E30-35 (CANH) - D1-4 (CG) Ignition switch off 200 Ω or higher
        E30-36 (CANL) - D1-4 (CG) Ignition switch off 200 Ω or higher
    2. A01DWSKE02

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


      1. Disconnect the E6 ECM connector.

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

        Standard Resistance
        Tester Connection Switch Condition Measured Resistance
        E6-24 (CANH) - D1-4 (CG) Ignition switch off 200 Ω or higher
        E6-23 (CANL) - D1-4 (CG) Ignition switch off 200 Ω or higher
    3. A01DXL5E02

      for 1GR-FE:


      1. Disconnect the E13 ECM connector.

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

        Standard Resistance
        Tester Connection Switch Condition Measured Resistance
        E13-33 (CANH) - D1-4 (CG) Ignition switch off 200 Ω or higher
        E13-34 (CANL) - D1-4 (CG) Ignition switch off 200 Ω or higher
      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 TO GND IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - NO. 1 JUNCTION CONNECTOR)


    1. A01E1DZE03

      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 Measured Resistance
      J59-5 (CANH) - D1-4 (CG) Ignition switch off 200 Ω or higher
      J59-16 (CANL) - D1-4 (CG) Ignition switch off 200 Ω or higher

    NG

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

    OK

  13. CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR SIDE)


    1. A01DXSEE30

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

      Standard Resistance
      Tester Connection Switch Condition Measured Resistance
      D1-6 (CANH) - D1-4 (CG) Ignition switch off 200 Ω or higher
      D1-14 (CANL) - D1-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

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


    1. A01E1DZE04

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

      Standard Resistance
      Tester Connection Switch Condition Measured Resistance
      J59-7 (CANH) - D1-4 (CG) Ignition switch off 200 Ω or higher
      J59-18 (CANL) - D1-4 (CG) 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 TO GND IN CAN BUS WIRE (YAW RATE SENSOR)


    1. A01E175E02

      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 Measured Resistance
      Y1-3 (CANH) - D1-4 (CG) Ignition switch off 200 Ω or higher
      Y1-2 (CANL) - D1-4 (CG) Ignition switch off 200 Ω or higher

    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 TO GND IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)


    1. A01DY4VE12

      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 Measured Resistance
      J50-2 (CANH) - D1-4 (CG) Ignition switch off 200 Ω or higher
      J50-1 (CANL) - D1-4 (CG) Ignition switch off 200 Ω or higher

    NG

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

    OK

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


    1. A01DY4VE13

      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 Measured Resistance
      J51-2 (CANH) - D1-4 (CG) Ignition switch off 200 Ω or higher
      J51-1 (CANL) - D1-4 (CG) 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 TO GND IN CAN BUS WIRE (STEERING ANGLE SENSOR)


    1. A01DV3JE02

      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 Measured Resistance
      S37-4 (CANH) - D1-4 (CG) Ignition switch off 200 Ω or higher
      S37-3 (CANL) - D1-4 (CG) Ignition switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO STEERING ANGLE SENSOR (CANH, CANL)

    OK

    REPLACE SPIRAL CABLE (STEERING ANGLE SENSOR) Click here