CAN COMMUNICATION SYSTEM Short to GND in CAN Bus Line

DESCRIPTION

There may be a short circuit between the CAN bus line 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 between CAN bus lines

  • ECM

  • Brake actuator assembly (VSC ECU)*1

  • Brake actuator assembly (ABS ECU)*2

  • Certification ECU*3

  • Air conditioning amplifier assembly*4

  • Spiral cable sub-assembly (steering angle sensor)*1

  • Yaw rate sensor*1

  • Main body ECU (instrument panel junction block assembly)

  • Center airbag sensor assembly

  • Power management control ECU*3

  • Power steering ECU assembly

  • Combination meter assembly

  • No. 1 junction connector

  • No. 2 junction connector

WIRING DIAGRAM

A01IQ4HE01
A01INJKE02

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


    NEXT

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


    1. A01ISU0E46
      Text in Illustration
      *1 Front view of DLC3

      Disconnect the H88 No. 2 junction connector connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H16-6 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      H16-14 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher

    NG

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

    OK

  4. CONNECT CONNECTOR


    1. Reconnect the H88 No. 2 junction connector connector.


    NEXT

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


    1. A01ISU0E46
      Text in Illustration
      *1 Front view of DLC3

      Disconnect the A50 No. 1 junction connector connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H16-6 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      H16-14 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR) Click here

    OK

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


    1. A01IN2JE64
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 1 Junction Connector)
      *2 Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A50-8 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      A50-19 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - BRAKE ACTUATOR) Click here

    OK

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


    1. A01IN2JE65
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 1 Junction Connector)
      *2 Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A50-10 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      A50-21 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher

    NG

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

    OK

    REPAIR OR REPLACE NO. 1 JUNCTION CONNECTOR

  8. CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - BRAKE ACTUATOR)


    1. A01IN2JE64
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 1 Junction Connector)
      *2 Front view of DLC3

      Disconnect the A53*1 brake actuator assembly (ABS ECU) or A52*2 or A54*3 brake actuator assembly (VSC ECU) connector.


      • *1: w/o Vehicle Stability Control System

      • *2: w/ Vehicle Stability Control System (for AD Series Engine)

      • *3: w/ Vehicle Stability Control System (for ZR Series Engine)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A50-8 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      A50-19 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher
      Result
      Result Proceed to
      OK (w/ Vehicle Stability Control System) A
      OK (w/o Vehicle Stability Control System) B
      NG C

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY (ABS ECU) Click here

    C

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

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY (VSC ECU) Click here

  9. CHECK FOR SHORT TO GND IN CAN BUS WIRE (ECM)


    1. A01IN2JE65
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 1 Junction Connector)
      *2 Front view of DLC3

      Disconnect the A51 ECM connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A50-10 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      A50-21 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher
      Result
      Result Proceed to
      OK (for 1AD-FTV) A
      OK (for 2AD-FHV) B
      OK (for 1ZR-FAE) C
      OK (for 2ZR-FAE) D
      NG E

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    D

    REPLACE ECM Click here

    E

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

    A

    REPLACE ECM Click here

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


    1. A01IN2JE66
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 Front view of DLC3

      Disconnect the H88 No. 2 junction connector connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H88-10 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      H88-21 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher

    NG

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

    OK

  11. CONNECT CONNECTOR


    1. Reconnect the A50 No. 1 junction connector connector.


    NEXT

  12. CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)

    Note

    For vehicles without an entry and start system, go to "Check for Short in CAN Bus Wires (No. 2 Junction Connector - Air Conditioning Amplifier)".


    1. A01IN2JE67
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H88-1 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      H88-12 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

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


    1. A01IN2JE68
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H88-2 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      H88-13 (CANL) - H16-4 (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 - AIR CONDITIONING AMPLIFIER)

    Note

    For vehicles with an entry and start system, go to "Check for Short in CAN Bus Wires (No. 2 Junction Connector - Power Steering ECU)".


    1. A01IN2JE69
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H88-4 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      H88-15 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  15. CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - POWER STEERING ECU)


    1. A01IN2JE70
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H88-3 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      H88-14 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  16. CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - SPIRAL CABLE)

    Note

    For vehicles without a vehicle stability control system, go to "Check for Short in CAN Bus Wires (No. 2 Junction Connector - Main Body ECU)".


    1. A01IN2JE71
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H88-5 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      H88-16 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

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


    1. A01IN2JE72
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H88-6 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      H88-17 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  18. CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - MAIN BODY ECU)


    1. A01IN2JE73
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H88-8 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      H88-19 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  19. CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - CENTER AIRBAG SENSOR)


    1. A01IN2JE74
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H88-11 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      H88-22 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  20. CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - COMBINATION METER)


    1. A01IN2JE75
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H88-9 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      H88-20 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

    REPAIR OR REPLACE NO. 2 JUNCTION CONNECTOR

  21. CONNECT CONNECTOR


    1. Reconnect the H88 No. 2 junction connector connector.


    NEXT

  22. CHECK FOR SHORT TO GND IN CAN BUS WIRE (POWER MANAGEMENT CONTROL ECU)


    1. A01IN2JE67
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 Front view of DLC3

      Disconnect the H71 power management control ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H88-1 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      H88-12 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    B

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    C

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO POWER MANAGEMENT CONTROL ECU (CA1H, CA1L)

    A

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  23. CONNECT CONNECTOR


    1. Reconnect the H88 No. 2 junction connector connector.


    NEXT

  24. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CERTIFICATION ECU)


    1. A01IN2JE68
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 Front view of DLC3

      Disconnect the H51 certification ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H88-2 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      H88-13 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher

    NG

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

    OK

    REPLACE CERTIFICATION ECU

  25. CONNECT CONNECTOR


    1. Reconnect the H88 No. 2 junction connector connector.


    NEXT

  26. CHECK FOR SHORT TO GND IN CAN BUS WIRE (AIR CONDITIONING AMPLIFIER)


    1. A01IN2JE69
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 Front view of DLC3

      Disconnect the H46*1 or H9*2 air conditioning amplifier assembly connector.


      • *1: for Automatic Air Conditioning System

      • *2: for Manual Air Conditioning System and w/o Air Conditioning System

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H88-4 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      H88-15 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO AIR CONDITIONING AMPLIFIER (CANH, CANL)

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  27. CONNECT CONNECTOR


    1. Reconnect the H88 No. 2 junction connector connector.


    NEXT

  28. CHECK FOR SHORT TO GND IN CAN BUS WIRE (POWER STEERING ECU)


    1. A01IN2JE70
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 Front view of DLC3

      Disconnect the H49 power steering ECU assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H88-3 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      H88-14 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO POWER STEERING ECU (CANH, CANL)

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here

  29. CONNECT CONNECTOR


    1. Reconnect the H88 No. 2 junction connector connector.


    NEXT

  30. CHECK FOR SHORT TO GND IN CAN BUS WIRE (SPIRAL CABLE)


    1. A01IN2JE71
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 Front view of DLC3

      Disconnect the H69 spiral cable sub-assembly (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
      H88-5 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      H88-16 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher

    NG

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

    OK

    REPLACE SPIRAL CABLE SUB-ASSEMBLY Click here

  31. CONNECT CONNECTOR


    1. Reconnect the H88 No. 2 junction connector connector.


    NEXT

  32. CHECK FOR SHORT TO GND IN CAN BUS WIRE (YAW RATE SENSOR)


    1. A01IN2JE72
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 Front view of DLC3

      Disconnect the H68 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
      H88-6 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      H88-17 (CANL) - H16-4 (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

  33. CONNECT CONNECTOR


    1. Reconnect the H88 No. 2 junction connector connector.


    NEXT

  34. CHECK FOR SHORT TO GND IN CAN BUS WIRE (MAIN BODY ECU)


    1. A01IN2JE73
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 Front view of DLC3

      Disconnect the H81 main body ECU (instrument panel junction block assembly) connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H88-8 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      H88-19 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO MAIN BODY ECU (CANH, CANL)

    OK

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

  35. CONNECT CONNECTOR


    1. Reconnect the H88 No. 2 junction connector connector.


    NEXT

  36. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CENTER AIRBAG SENSOR)


    1. A01IN2JE74
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 Front view of DLC3

      Disconnect the H19 center airbag sensor assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H88-11 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      H88-22 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO CENTER AIRBAG SENSOR (CANH, CANL)

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

  37. CONNECT CONNECTOR


    1. Reconnect the H88 No. 2 junction connector connector.


    NEXT

  38. CHECK FOR SHORT TO GND IN CAN BUS WIRE (COMBINATION METER)


    1. A01IN2JE75
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 Front view of DLC3

      Disconnect the H62 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H88-9 (CANH) - H16-4 (CG) Ignition switch off 200 Ω or higher
      H88-20 (CANL) - H16-4 (CG) Ignition switch off 200 Ω or higher

    NG

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

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here