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

  • Brake actuator assembly (VSC ECU)

  • Certification ECU*1

  • Air conditioning amplifier assembly*2

  • Spiral cable sub-assembly (steering angle sensor)

  • Yaw rate sensor

  • Main body ECU (instrument panel junction block assembly)

  • Center airbag sensor assembly

  • Power management control ECU*1

  • Power steering ECU assembly

  • Radio and display receiver assembly*3

  • Combination meter assembly

  • No. 1 junction connector

  • No. 2 junction connector

WIRING DIAGRAM

A01ISLVE01
A01INJKE03

INSPECTION PROCEDURE

Note

For vehicles with an entry and start system:

Before replacing the certification ECU, refer to the entry and start system (for Entry Function) 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 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 IN CAN BUS WIRES (DLC3 CAN BRANCH WIRE)


    1. A01ISU0E44
      Text in Illustration
      *1 Front view of DLC3

      Disconnect the H88 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
      H16-6 (CANH) - H16-14 (CANL) 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.


    NEXT

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


    1. A01ISU0E44
      Text in Illustration
      *1 Front view of DLC3

      Disconnect the A50 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
      H16-6 (CANH) - H16-14 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

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


    1. A01IQK6E39
      Text in Illustration
      *1

      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
      A50-8 (CANH) - A50-19 (CANL) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

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


    1. A01IQK6E40
      Text in Illustration
      *1

      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
      A50-10 (CANH) - A50-21 (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 A50 No. 1 junction connector.


    NEXT

  9. CHECK FOR SHORT IN CAN BUS WIRES (BRAKE ACTUATOR ASSEMBLY)


    1. A01IQ6CE04
      Text in Illustration
      *1 for AD Series Engine
      *2 for ZR Series Engine
      *3

      Front view of wire harness connector

      (to Brake Actuator Assembly)

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


      • *1: for AD Series Engine

      • *2: for ZR Series Engine

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

      Standard Resistance
      for AD Series Engine
      Tester Connection Switch Condition Specified Condition
      A52-35 (CANH) - A52-14 (CANL) Ignition switch off 54 to 69 Ω
      for ZR Series Engine
      Tester Connection Switch Condition Specified Condition
      A54-35 (CANH) - A54-14 (CANL) Ignition switch off 54 to 69 Ω

    NG

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

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY (VSC ECU) Click here

  10. CONNECT CONNECTOR


    1. Reconnect the A50 No. 1 junction connector.


    NEXT

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


    1. A01ISXDE07
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ECM)
      *2 for AD Series Engine
      *3 for ZR Series Engine

      Disconnect the A51 ECM connector.

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

      Standard Resistance
      for AD Series Engine
      Tester Connection Switch Condition Specified Condition
      A51-7 (CANH) - A51-6 (CANL) Ignition switch off 108 to 132 Ω
      for ZR Series Engine
      Tester Connection Switch Condition Specified Condition
      A51-8 (CANH) - A51-9 (CANL) Ignition switch off 108 to 132 Ω
      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

  12. CONNECT CONNECTOR


    1. Reconnect the A50 No. 1 junction connector.


    NEXT

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


    1. A01IQK6E41
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 junction connector)

      Disconnect the H88 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
      H88-10 (CANH) - H88-21 (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. CHECK FOR SHORT IN CAN BUS WIRES (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 Assembly)".


    1. A01IQK6E42
      Text in Illustration
      *1

      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
      H88-1 (CANH) - H88-12 (CANL) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  15. CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - CERTIFICATION ECU)


    1. A01IQK6E43
      Text in Illustration
      *1

      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
      H88-2 (CANH) - H88-13 (CANL) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  16. CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

    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 Assembly)".


    1. A01IQK6E43
      Text in Illustration
      *1

      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
      H88-2 (CANH) - H88-13 (CANL) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  17. CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - POWER STEERING ECU ASSEMBLY)


    1. A01IQK6E45
      Text in Illustration
      *1

      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
      H88-3 (CANH) - H88-14 (CANL) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  18. CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - RADIO AND DISPLAY RECEIVER ASSEMBLY)

    Note

    For vehicles without a radio and display receiver type, go to "Check for Short in CAN Bus Wires (No. 2 Junction Connector - Spiral Cable Sub-assembly)".


    1. A01IQK6E44
      Text in Illustration
      *1

      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
      H88-4 (CANH) - H88-15 (CANL) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  19. CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - SPIRAL CABLE SUB-ASSEMBLY)


    1. A01IQK6E46
      Text in Illustration
      *1

      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
      H88-5 (CANH) - H88-16 (CANL) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

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


    1. A01IQK6E47
      Text in Illustration
      *1

      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
      H88-6 (CANH) - H88-17 (CANL) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  21. CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - MAIN BODY ECU)


    1. A01IQK6E49
      Text in Illustration
      *1

      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
      H88-8 (CANH) - H88-19 (CANL) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  22. CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - CENTER AIRBAG SENSOR ASSEMBLY)


    1. A01IQK6E48
      Text in Illustration
      *1

      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
      H88-11 (CANH) - H88-22 (CANL) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  23. CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)


    1. A01IQK6E50
      Text in Illustration
      *1

      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
      Result
      Tester Connection Switch Condition Specified Condition
      H88-9 (CANH) - H88-20 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

    REPLACE NO. 2 JUNCTION CONNECTOR

  24. CONNECT CONNECTOR


    1. Reconnect the H88 No. 2 junction connector.


    NEXT

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


    1. A01IOSCE10
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      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
      H71-14 (CA1H) - H71-13 (CA1L) Ignition switch off 54 to 69 Ω
      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

  26. CONNECT CONNECTOR


    1. Reconnect the H88 No. 2 junction connector.


    NEXT

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


    1. A01ISYUE04
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Certification ECU)

      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
      H51-9 (CANH) - H51-10 (CANL) Ignition switch off 54 to 69 Ω

    NG

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

    OK

    REPLACE CERTIFICATION ECU

  28. CONNECT CONNECTOR


    1. Reconnect the H88 No. 2 junction connector.


    NEXT

  29. CHECK FOR SHORT IN CAN BUS WIRES (AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. A01IOPRE01
      Text in Illustration
      *1 for Automatic Air Conditioning System
      *2 for Manual Air Conditioning System or w/o Air Conditioning System
      *3

      Front view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

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


      • *1: for Automatic Air Conditioning System

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

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

      Standard Resistance
      for Automatic Air Conditioning System
      Tester Connection Switch Condition Specified Condition
      H46-11 (CANH) - H46-12 (CANL) Ignition switch off 54 to 69 Ω
      for Manual Air Conditioning System or w/o Air Conditioning System
      Tester Connection Switch Condition Specified Condition
      H9-2 (CANH) - H9-3 (CANL) Ignition switch off 54 to 69 Ω

    NG

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

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  30. CONNECT CONNECTOR


    1. Reconnect the H88 No. 2 junction connector.


    NEXT

  31. CHECK FOR SHORT IN CAN BUS WIRES (POWER STEERING ECU ASSEMBLY)


    1. A01IRTBE03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

      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
      H49-2 (CANH) - H49-8 (CANL) Ignition switch off 54 to 69 Ω

    NG

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

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here

  32. CONNECT CONNECTOR


    1. Reconnect the H88 No. 2 junction connector.


    NEXT

  33. CHECK FOR SHORT IN CAN BUS WIRES (RADIO AND DISPLAY RECEIVER ASSEMBLY)


    1. A01ISS8E03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Radio and Display Receiver Assembly)

      Disconnect the H105 radio and display receiver assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H105-9 (CANH) - H105-10 (CANL) Ignition switch off 54 to 69 Ω

    NG

    REPLACE CAN BRANCH WIRE CONNECTED TO RADIO AND DISPLAY RECEIVER ASSEMBLY (CANH, CANL)

    OK

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

  34. CONNECT CONNECTOR


    1. Reconnect the H88 No. 2 junction connector.


    NEXT

  35. CHECK FOR SHORT IN CAN BUS WIRES (SPIRAL CABLE SUB-ASSEMBLY)


    1. A01IPSCE05
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Spiral Cable Sub-assembly)

      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
      H69-4 (CANH) - H69-3 (CANL) Ignition switch off 54 to 69 Ω

    NG

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

    OK

    REPLACE SPIRAL CABLE SUB-ASSEMBLY Click here

  36. CONNECT CONNECTOR


    1. Reconnect the H88 No. 2 junction connector.


    NEXT

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


    1. A01IPT7E08
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Yaw Rate Sensor)

      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
      H68-2 (CANH) - H68-3 (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

  38. CONNECT CONNECTOR


    1. Reconnect the H88 No. 2 junction connector.


    NEXT

  39. CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU)


    1. A01IN0UE03
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Main Body ECU)

      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
      H81-15 (CANH) - H81-16 (CANL) Ignition switch off 54 to 69 Ω

    NG

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

    OK

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

  40. CONNECT CONNECTOR


    1. Reconnect the H88 No. 2 junction connector.


    NEXT

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


    1. A01IRRWE03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)

      Disconnect the H19 center airbag sensor 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
      H19-13 (CANH) - H19-22 (CANL) Ignition switch off 54 to 69 Ω

    NG

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

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

  42. CONNECT CONNECTOR


    1. Reconnect the H88 No. 2 junction connector.


    NEXT

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


    1. A01IQXRE05
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Combination Meter Assembly)

      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
      H62-22 (CANH) - H62-23 (CANL) Ignition switch off 108 to 132 Ω

    NG

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

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here