CAN COMMUNICATION SYSTEM Check CAN Bus Lines for Short Circuit (RHD Models)

DESCRIPTION

There may be a short circuit between the CAN bus main wires and/or CAN branch wires 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 DLC3 is below 54 Ω.

  • Short in CAN bus main wire

  • Short in CAN bus branch wire

  • ECM

  • Certification ECU (Smart key ECU)

  • Combination meter

  • Power steering ECU

  • Center airbag sensor assembly

  • Skid control ECU (Brake actuator assembly)

  • Steering angle sensor

  • Yaw rate sensor

  • Main body ECU (Multiplex network body ECU)

  • Power management control ECU

  • Multi-media module receiver assembly

  • CAN No. 1 junction connector

  • CAN No. 2 junction connector

WIRING DIAGRAM

A019M16E05
A019MWGE04

INSPECTION PROCEDURE

Note


  • Turn the engine switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.

  • Turn the engine switch off before inspecting CAN bus wires for a ground short.

  • After the engine switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.

  • Before measuring the resistance, leave the vehicle as is for at least 1minute and do not operate the engine switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

Tech Tips


  • Operating the engine switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE


  1. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 1 J/C - CAN NO. 2 J/C)


    1. Turn the engine switch off.

    2. A019M7SE62
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *2 to CAN No. 2 Junction Connector

      Disconnect the CAN No. 1 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F70-7 (CANH) - F70-18 (CANL) Engine switch off 108 to 132 Ω

    NG

    CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 2 J/C - CAN NO. 1 J/C) Click here

    OK

  2. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 1 J/C - ECM)


    1. A019P6ME25
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *2 to ECM

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F70-6 (CANH) - F70-17 (CANL) Engine switch off 108 to 132 Ω

    NG

    CHECK FOR SHORT IN CAN BUS WIRE (ECM) Click here

    OK

  3. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 1 J/C - MULTI-MEDIA MODULE RECEIVER ASSEMBLY)

    Tech Tips

    For vehicles without navigation system, go to the next step.


    1. A019MXHE14
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Multi-media Module Receiver Assembly)

      Disconnect the multi-media module receiver assembly connector.

    2. A019M7SE86
      Text in Illustration
      *2

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *3 to Multi-media Module Receiver Assembly

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F70-8 (CANH) - F70-19 (CANL) Engine switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - MULTI-MEDIA MODULE RECEIVER ASSEMBLY)

    OK

  4. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 1 J/C - YAW RATE SENSOR)


    1. A019KM6E11
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Yaw Rate Sensor)

      Disconnect the yaw rate sensor connector.

    2. A019M7SE68
      Text in Illustration
      *2

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *3 to Yaw Rate Sensor

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F70-11 (CANH) - F70-22 (CANL) Engine switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - YAW RATE SENSOR)

    OK

  5. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 1 J/C - POWER MANAGEMENT CONTROL ECU)


    1. A019M6TE26
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the power management control ECU connector.

    2. A019M7SE67
      Text in Illustration
      *2

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *3 to Power Management Control ECU

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F70-9 (CANH) - F70-20 (CANL) Engine switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - POWER MANAGEMENT CONTROL ECU)

    OK

  6. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 1 J/C - CENTER AIRBAG SENSOR ASSEMBLY)


    1. A019O0VE11
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)

      Disconnect the center airbag sensor assembly connector.

    2. A019M7SE70
      Text in Illustration
      *2

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *3 to Center Airbag Sensor Assembly

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F70-10 (CANH) - F70-21 (CANL) Engine switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - CENTER AIRBAG SENSOR ASSEMBLY)

    OK

  7. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 1 J/C - MAIN BODY ECU)


    1. A019O5VE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU)

      Disconnect the main body ECU connector.

    2. A019M7SE71
      Text in Illustration
      *2

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *3 to Main Body ECU

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F70-5 (CANH) - F70-16 (CANL) Engine switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - MAIN BODY ECU)

    OK

  8. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 1 J/C)


    1. Reconnect the CAN No. 1 junction connector.

    2. A019KCZE93
      Text in Illustration
      *1 DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F17-6 (CANH) - F17-14 (CANL) Engine switch off 54 to 69 Ω

      Note

      The resistance must be measured after the main wire connected ECUs (ECM and certification ECU), and the CAN No. 1 and No. 2 junction connectors are reconnected.


    NG

    REPLACE CAN NO. 1 JUNCTION CONNECTOR

    OK

  9. CHECK FOR SHORT IN CAN BUS WIRES (MULTI-MEDIA MODULE RECEIVER ASSEMBLY)

    Tech Tips

    For vehicles without navigation system, go to the next step.


    1. Reconnect the multi-media module receiver assembly connector.

    2. A019KCZE93
      Text in Illustration
      *1 DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F17-6 (CANH) - F17-14 (CANL) Engine switch off 54 to 69 Ω

    NG

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY

    OK

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


    1. Reconnect the yaw rate sensor connector.

    2. A019KCZE93
      Text in Illustration
      *1 DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F17-6 (CANH) - F17-14 (CANL) Engine switch off 54 to 69 Ω

    NG

    REPLACE YAW RATE SENSOR ASSEMBLY

    OK

  11. CHECK FOR SHORT IN CAN BUS WIRES (POWER MANAGEMENT CONTROL ECU)


    1. Reconnect the power management control ECU connector.

    2. A019KCZE93
      Text in Illustration
      *1 DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F17-6 (CANH) - F17-14 (CANL) Engine switch off 54 to 69 Ω

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU

    OK

  12. CHECK FOR SHORT IN CAN BUS WIRES (CENTER AIRBAG SENSOR ASSEMBLY)


    1. Reconnect the center airbag sensor assembly connector.

    2. A019KCZE93
      Text in Illustration
      *1 DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F17-6 (CANH) - F17-14 (CANL) Engine switch off 54 to 69 Ω

    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY

    OK

    REPLACE MULTIPLEX NETWORK BODY ECU (MAIN BODY ECU)

  13. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 2 J/C - CAN NO. 1 J/C)


    1. Reconnect the CAN No. 1 junction connector.

    2. A019M7SE74
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *2 to CAN No. 1 Junction Connector

      Disconnect the CAN No. 2 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F71-7 (CANH) - F71-18 (CANL) Engine switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - CAN NO. 2 JUNCTION CONNECTOR)

    OK

  14. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 2 J/C - DLC3)


    1. A019M7SE87
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *2 to DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F71-3 (CANH) - F71-14 (CANL) Engine switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3

    OK

  15. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 2 J/C - CERTIFICATION ECU)


    1. A019M7SE72
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *2 to Certification ECU

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F71-2 (CANH) - F71-13 (CANL) Engine switch off 108 to 132 Ω

    NG

    CHECK FOR SHORT IN CAN BUS WIRES (CERTIFICATION ECU) Click here

    OK

  16. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 2 J/C - COMBINATION METER)


    1. A019NZDE03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Combination Meter)

      Disconnect the combination meter connector.

    2. A019M7SE88
      Text in Illustration
      *2

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *3 to Combination Meter

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F71-4 (CANH) - F71-15 (CANL) Engine switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - COMBINATION METER)

    OK

  17. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 2 J/C - STEERING ANGLE SENSOR)


    1. A019MNQE27
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Steering Angle Sensor)

      Disconnect the steering angle sensor connector.

    2. A019M7SE89
      Text in Illustration
      *2

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *3 to Steering Angle Sensor

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F71-5 (CANH) - F71-16 (CANL) Engine switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - STEERING ANGLE SENSOR)

    OK

  18. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 2 J/C - POWER STEERING ECU)


    1. A019OZNE09
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Steering ECU)

      Disconnect the power steering ECU connector.

    2. A019M7SE90
      Text in Illustration
      *2

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *3 to Power Steering ECU

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F71-6 (CANH) - F71-17 (CANL) Engine switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - POWER STEERING ECU)

    OK

  19. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 2 J/C - SKID CONTROL ECU)


    1. A019MT5E01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU)

      Disconnect the skid control ECU connector.

    2. A019M7SE73
      Text in Illustration
      *2

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *3 to Skid Control ECU

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F71-1 (CANH) - F71-12 (CANL) Engine switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - SKID CONTROL ECU)

    OK

  20. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C)


    1. Reconnect the CAN No. 1 and No. 2 junction connectors.

    2. A019KCZE93
      Text in Illustration
      *1 DLC3

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

      Note

      The resistance must be measured after the main wire connected ECUs (ECM and certification ECU), and the CAN No. 1 and No. 2 junction connectors are reconnected.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F17-6 (CANH) - F17-14 (CANL) Engine switch off 54 to 69 Ω

    NG

    REPLACE CAN NO. 2 JUNCTION CONNECTOR

    OK

  21. CHECK FOR SHORT IN CAN BUS WIRES (COMBINATION METER)


    1. Reconnect the combination meter connector.

    2. A019KCZE93
      Text in Illustration
      *1 DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F17-6 (CANH) - F17-14 (CANL) Engine switch off 54 to 69 Ω

    NG

    REPLACE COMBINATION METER ASSEMBLY

    OK

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


    1. Reconnect the steering angle sensor connector.

    2. A019KCZE93
      Text in Illustration
      *1 DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F17-6 (CANH) - F17-14 (CANL) Engine switch off 54 to 69 Ω

    NG

    REPLACE SPIRAL CABLE W/STEERING SENSOR SUB-ASSEMBLY

    OK

  23. CHECK FOR SHORT IN CAN BUS WIRE (POWER STEERING ECU)


    1. Reconnect the power steering ECU connector.

    2. A019KCZE93
      Text in Illustration
      *1 DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F17-6 (CANH) - F17-14 (CANL) Engine switch off 54 to 69 Ω

    NG

    REPLACE POWER STEERING ECU

    OK

    REPLACE BRAKE ACTUATOR (SKID CONTROL ECU)

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


    1. A019OJ1E52
      Text in Illustration
      *A for 2GR-FE
      *B for 1AR-FE
      *1

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

    2. A019OMLE03
      *2

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *3 to ECM

      Disconnect the CAN No. 1 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F70-6 (CANH) - F70-17 (CANL) Engine switch off 1 MΩ or higher
      Result
      Result Proceed to
      OK (for 2GR-FE) A
      OK (for 1AR-FE) B
      NG C

    B

    REPLACE ECM Click here

    C

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 1 J/C - ECM)

    A

    REPLACE ECM Click here

  25. CHECK FOR SHORT IN CAN BUS WIRES (CERTIFICATION ECU)


    1. A019N51E06
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Certification ECU)

      Disconnect the certification ECU connector.

    2. A019M7SE72
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *2 to Certification ECU

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F71-2 (CANH) - F71-13 (CANL) Engine switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 2 J/C - CERTIFICATION ECU)

    OK

    REPLACE SMART KEY ECU ASSEMBLY (CERTIFICATION ECU)