CAN COMMUNICATION SYSTEM Short in CAN Bus Lines

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 53 Ω.

Symptom Trouble Area
The resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is below 53 Ω.

  • Short between CAN bus lines

  • ECM

  • Electric vehicle control ECU assembly

  • Airbag ECU assembly

  • Brake actuator assembly (skid control ECU)

  • No. 1 junction connector

  • No. 2 junction connector

  • No. 3 junction connector

  • No. 4 junction connector

  • No. 5 junction connector

  • DLC3 CAN branch wire or connector

WIRING DIAGRAM

A01CIWYE02
A01CI8GE02

INSPECTION PROCEDURE

Note

The vehicle is equipped with an SRS (Supplemental Restraint System) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the Precaution in the SRS Click here.

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. PRECAUTION

    Note

    After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.


    NEXT

  2. 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 the CAN branch wire.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the airbag system.

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.


    NEXT

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


    1. A01CH4ZE29
      Text in Illustration
      *a Front view of DLC3

      Disconnect the J72 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
      D34-6 (CANH) - D34-14 (CANL) Ignition switch off 1 MΩ or higher

    NG

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

    OK

  4. CONNECT CONNECTOR


    1. Reconnect the J72 No. 2 junction connector.


    NEXT

  5. CHECK FOR SHORT IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR SIDE)


    1. A01CH4ZE29
      Text in Illustration
      *a Front view of DLC3

      Disconnect the J76 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
      D34-6 (CANH) - D34-14 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

  6. CHECK FOR SHORT IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - ELECTRIC VEHICLE CONTROL ECU ASSEMBLY)


    1. A01CGO1E59
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      J76-3 (CANH) - J76-14 (CANL) Ignition switch off 200 Ω or higher
      J76-4 (CANH) - J76-15 (CANL) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

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


    1. A01CGO1E60
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      J76-6 (CANH) - J76-17 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

    REPLACE NO. 1 JUNCTION CONNECTOR

  8. CONNECT CONNECTOR


    1. Reconnect the J76 No. 1 junction connector.


    NEXT

  9. CHECK FOR SHORT IN CAN BUS WIRE (ELECTRIC VEHICLE CONTROL ECU ASSEMBLY)


    1. A01CGU6E07
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Electric Vehicle Control ECU Assembly)

      Disconnect the electric vehicle control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E41-4 (CANH) - E41-5 (CANL) Ignition switch off 54 to 69 Ω
      E41-8 (CANP) - E41-9 (CANN) Ignition switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO ELECTRIC VEHICLE CONTROL ECU ASSEMBLY (CANH, CANL CANP, CANN)

    OK

    REPLACE ELECTRIC VEHICLE CONTROL ECU ASSEMBLY Click here

  10. CONNECT CONNECTOR


    1. Reconnect the J76 No. 1 junction connector.


    NEXT

  11. CHECK FOR SHORT IN CAN BUS WIRE (ECM)


    1. A01CH7UE09
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E40-7 (CANH) - E40-1 (CANL) Ignition switch off 108 to 132 Ω

    NG

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

    OK

    REPLACE ECM Click here

  12. CONNECT CONNECTOR


    1. Reconnect the J76 No. 1 junction connector.


    NEXT

  13. CHECK FOR SHORT IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - NO. 1 JUNCTION CONNECTOR)


    1. A01CGO1E61
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

      Disconnect the 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
      J72-6 (CANH) - J72-17 (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

  14. CONNECT CONNECTOR


    1. Reconnect the J72 No. 2 junction connector.


    NEXT

  15. CHECK FOR SHORT IN CAN BUS WIRE (NO. 4 JUNCTION CONNECTOR SIDE)


    1. A01CH4ZE29
      Text in Illustration
      *a Front view of DLC3

      Disconnect the J56 No. 4 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D34-6 (CANH) - D34-14 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

  16. CHECK FOR SHORT IN CAN BUS WIRE (NO. 4 JUNCTION CONNECTOR - SKID CONTROL ECU)


    1. A01CIQSE35
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 4 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      J56-4 (CANH) - J56-9 (CANL) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  17. CHECK FOR SHORT IN CAN BUS WIRE (NO. 4 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)


    1. A01CIQSE36
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 4 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      J56-5 (CANH) - J56-10 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

    REPLACE NO. 4 JUNCTION CONNECTOR

  18. CONNECT CONNECTOR


    1. Reconnect the J56 No. 4 junction connector.


    NEXT

  19. CHECK FOR SHORT IN CAN BUS WIRE (SKID CONTROL ECU)


    1. A01CGRAE47
      Text in Illustration
      *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
      Tester Connection Switch Condition Specified Condition
      B9-15 (CH) - B9-26 (CL-) Ignition switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO SKID CONTROL ECU (CH, CL-)

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

  20. CONNECT CONNECTOR


    1. Reconnect the J56 No. 4 junction connector.


    NEXT

  21. CHECK FOR SHORT IN CAN BUS WIRE (NO. 5 JUNCTION CONNECTOR)


    1. A01CHJZE07
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 5 Junction Connector)

      Disconnect the No. 5 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      J84-1 (CA1H) - J84-2 (CA1L) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 5 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR)

    OK

    REPLACE NO. 5 JUNCTION CONNECTOR

  22. CONNECT CONNECTOR


    1. Reconnect the J56 No. 4 junction connector.


    NEXT

  23. CHECK FOR SHORT IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR)


    1. A01CGO1E67
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 3 Junction Connector)

      Disconnect the 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
      J82-9 (CANH) - J82-20 (CANL) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR)

    OK

  24. CHECK FOR SHORT IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR SIDE)


    1. A01CH4ZE29
      Text in Illustration
      *a Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D34-6 (CANH) - D34-14 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

  25. CHECK FOR SHORT IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - TACHOGRAPH ASSEMBLY)


    1. A01CGO1E66
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 3 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      J82-7 (CANH) - J82-18 (CANL) Ignition switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - TACHOGRAPH ASSEMBLY)

    OK

    REPLACE NO. 3 JUNCTION CONNECTOR

  26. CONNECT CONNECTOR


    1. Reconnect the J82 No. 3 junction connector.


    NEXT

  27. CHECK FOR SHORT IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - AIRBAG ECU ASSEMBLY)


    1. A01CGO1E64
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

      Disconnect the 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
      J72-3 (CANH) - J72-14 (CANL) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  28. CHECK FOR SHORT IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)


    1. A01CGO1E65
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      J72-5 (CANH) - J72-16 (CANL) Ignition switch off 108 to 132 Ω

    NG

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

    OK

    REPLACE NO. 2 JUNCTION CONNECTOR

  29. CONNECT CONNECTOR


    1. Reconnect the J72 No. 2 junction connector.


    NEXT

  30. CHECK FOR SHORT IN CAN BUS WIRE (AIRBAG ECU ASSEMBLY)


    1. A01CIBIE05
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Airbag ECU Assembly)

      Disconnect the airbag ECU assembly connector Click here.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A30-18 (CANH) - A30-10 (CANL) Ignition switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO AIRBAG ECU ASSEMBLY (CANH, CANL)

    OK

    REPLACE AIRBAG ECU ASSEMBLY Click here