CAN COMMUNICATION SYSTEM Short to GND in CAN Bus Line

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 between CAN bus lines and GND

  • ECM

  • Air conditioning amplifier assembly*1

  • Certification ECU (smart key ECU assembly)*2

  • Headlight leveling ECU assembly*3

  • Center airbag sensor assembly*4

  • Brake actuator assembly (skid control ECU)*5

  • Spiral cable sub-assembly (steering angle sensor)*6

  • Combination meter assembly

  • No. 1 CAN junction connector

  • No. 2 CAN junction connector

WIRING DIAGRAM

B007S0YE01
B007VLRE02

INSPECTION PROCEDURE

Note

For vehicles with a smart entry and start system:

Before replacing the certification ECU (smart key ECU assembly), refer to the smart entry and start system 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. 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:

      For vehicles with an airbag system:

      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

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


    1. B007UGYE37
      Text in Illustration
      *a Front view of DLC3

      Disconnect the H98 No. 2 CAN junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H23-6 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      H23-14 (CANL) - H23-4 (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 H98 No. 2 CAN junction connector.


    NEXT

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


    1. B007UGYE37
      Text in Illustration
      *a Front view of DLC3

      Disconnect the H96 No. 1 CAN junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H23-6 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      H23-14 (CANL) - H23-4 (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 CAN JUNCTION CONNECTOR - CERTIFICATION ECU)

    Note

    For vehicles without a smart entry and start system, go to "Check for Short to GND in CAN Bus Wires (No. 1 CAN Junction Connector - Headlight Leveling ECU Assembly)".


    1. B007VTME20
      Text in Illustration
      *a

      Front view of wire harness connector

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

      Disconnect the No. 1 CAN junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H66-1 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      H66-2 (CANL) - H23-4 (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 CAN JUNCTION CONNECTOR - HEADLIGHT LEVELING ECU ASSEMBLY)

    Note

    For vehicles with a halogen headlight, go to "Check for Short to GND in CAN Bus Wires (No. 1 CAN Junction Connector - Center Airbag Sensor Assembly)".


    1. B007VTME21
      Text in Illustration
      *a

      Front view of wire harness connector

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

      Disconnect the No. 1 CAN junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H90-1 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      H90-2 (CANL) - H23-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  7. CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 1 CAN JUNCTION CONNECTOR - CENTER AIRBAG SENSOR ASSEMBLY)

    Note

    For vehicles without an airbag system, go to "Check for Short to GND in CAN Bus Wires (No. 1 CAN Junction Connector - Brake Actuator Assembly)".


    1. B007VTME22
      Text in Illustration
      *a

      Front view of wire harness connector

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

      Disconnect the No. 1 CAN junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H93-1 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      H93-2 (CANL) - H23-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

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

    Note

    For vehicles without an ABS, go to "Check for Short to GND in CAN Bus Wires (No. 1 CAN Junction Connector - ECM)".


    1. B007VTME23
      Text in Illustration
      *a

      Front view of wire harness connector

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

      Disconnect the No. 1 CAN junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H94-1 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      H94-2 (CANL) - H23-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  9. CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 1 CAN JUNCTION CONNECTOR - SPIRAL CABLE SUB-ASSEMBLY)

    Note

    For vehicles without a VSC, go to "Check for Short to GND in CAN Bus Wires (No. 1 CAN Junction Connector - ECM)".


    1. B007VTME24
      Text in Illustration
      *a

      Front view of wire harness connector

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

      Disconnect the No. 1 CAN junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H95-1 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      H95-2 (CANL) - H23-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

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


    1. B007VTME25
      Text in Illustration
      *a

      Front view of wire harness connector

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

      Disconnect the No. 1 CAN junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H63-1 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      H63-2 (CANL) - H23-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

    REPLACE NO. 1 CAN JUNCTION CONNECTOR

  11. CONNECT CONNECTOR


    1. Reconnect the No. 1 CAN junction connector(s).


    NEXT

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


    1. B007PIVE06
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Certification ECU [Smart Key ECU Assembly])
      *b Front view of DLC3

      Disconnect the certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      B76-40 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      B76-18 (CANL) - H23-4 (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 (SMART KEY ECU ASSEMBLY)

  13. CONNECT CONNECTOR


    1. Reconnect the No. 1 CAN junction connector(s).


    NEXT

  14. CHECK FOR SHORT TO GND IN CAN BUS WIRE (HEADLIGHT LEVELING ECU ASSEMBLY)


    1. B007RMWE15
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Headlight Leveling ECU Assembly)
      *b Front view of DLC3

      Disconnect the headlight leveling ECU assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A39-6 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      A39-7 (CANL) - H23-4 (CG) Ignition switch off 200 Ω or higher
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    B

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here

    C

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

    A

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here

  15. CONNECT CONNECTOR


    1. Reconnect the No. 1 CAN junction connector(s).


    NEXT

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


    1. B007OKIE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)
      *b Front view of DLC3

      Disconnect the 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
      B4-13 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      B4-22 (CANL) - H23-4 (CG) Ignition switch off 200 Ω or higher

    NG

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

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

  17. CONNECT CONNECTOR


    1. Reconnect the No. 1 CAN junction connector(s).


    NEXT

  18. CHECK FOR SHORT TO GND IN CAN BUS WIRE (BRAKE ACTUATOR ASSEMBLY)


    1. Disconnect the brake actuator assembly (skid control ECU) connector.

      B007V9NE02
      Text in Illustration
      *A w/ VSC *B w/o VSC
      *a

      Front view of wire harness connector

      (to Brake Actuator Assembly [Skid Control ECU])

      		 *b Front view of DLC3

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

      Standard Resistance
      w/ VSC
      Tester Connection Switch Condition Specified Condition
      B92-22 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      B92-10 (CANL) - H23-4 (CG) Ignition switch off 200 Ω or higher
      w/o VSC
      Tester Connection Switch Condition Specified Condition
      B19-6 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      B19-5 (CANL) - H23-4 (CG) Ignition switch off 200 Ω or higher
      Result
      Result Proceed to
      OK (w/ VSC) A
      OK (w/o VSC) B
      NG C

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

    C

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

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

  19. CONNECT CONNECTOR


    1. Reconnect the No. 1 CAN junction connector(s).


    NEXT

  20. CHECK FOR SHORT TO GND IN CAN BUS WIRE (SPIRAL CABLE SUB-ASSEMBLY)


    1. B007TV1E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Spiral Cable Sub-assembly [Steering Angle Sensor])
      *b Front view of DLC3

      Disconnect the 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
      H92-3 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      H92-2 (CANL) - H23-4 (CG) Ignition switch off 200 Ω or higher

    NG

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

    OK

    REPLACE SPIRAL CABLE SUB-ASSEMBLY (STEERING ANGLE SENSOR) Click here

  21. CONNECT CONNECTOR


    1. Reconnect the No. 1 CAN junction connector(s).


    NEXT

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


    1. Disconnect the ECM connector.

      B007V5TE05
      Text in Illustration
      *A for 1KD-FTV (w/ DPF) *B for 1KD-FTV (w/o DPF)
      *C for 2KD-FTV *D for 1TR-FE, 2TR-FE (w/ Dual VVT-i)
      *E for 2TR-FE (w/o Dual VVT-i) *F for 5L-E
      *G for 1GD-FTV - -
      *a

      Front view of wire harness connector

      (to ECM)

      		 *b Front view of DLC3

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

      Standard Resistance
      for 1KD-FTV (w/ DPF)
      Tester Connection Switch Condition Specified Condition
      B73-7 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      B73-6 (CANL) - H23-4 (CG) Ignition switch off 200 Ω or higher
      for 1KD-FTV (w/o DPF)
      Tester Connection Switch Condition Specified Condition
      B72-7 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      B72-6 (CANL) - H23-4 (CG) Ignition switch off 200 Ω or higher
      for 2KD-FTV
      Tester Connection Switch Condition Specified Condition
      B88-6 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      B88-7 (CANL) - H23-4 (CG) Ignition switch off 200 Ω or higher
      for 1TR-FE, 2TR-FE (w/ Dual VVT-i)
      Tester Connection Switch Condition Specified Condition
      B94-13 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      B94-26 (CANL) - H23-4 (CG) Ignition switch off 200 Ω or higher
      for 2TR-FE (w/o Dual VVT-i)
      Tester Connection Switch Condition Specified Condition
      B71-8 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      B71-9 (CANL) - H23-4 (CG) Ignition switch off 200 Ω or higher
      for 5L-E
      Tester Connection Switch Condition Specified Condition
      B74-10 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      B74-11 (CANL) - H23-4 (CG) Ignition switch off 200 Ω or higher
      for 1GD-FTV
      Tester Connection Switch Condition Specified Condition
      B97-13 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      B97-26 (CANL) - H23-4 (CG) Ignition switch off 200 Ω or higher

      Tech Tips

      *: Replacement procedure:



    NG

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

    OK

    REPLACE ECM*

  23. CONNECT CONNECTOR


    1. Reconnect all wire harness CAN junction connectors.


    NEXT

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


    1. B007VTME26
      Text in Illustration
      *a

      Front view of wire harness connector

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

      Disconnect the No. 2 CAN junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H100-1 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      H100-2 (CANL) - H23-4 (CG) Ignition switch off 200 Ω or higher

    NG

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

    OK

  25. CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 2 CAN JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

    Note

    For vehicles without an air conditioning system or with 5L-E engine type, go to "Check for Short to GND in CAN Bus Wires (No. 2 CAN Junction Connector - Combination Meter Assembly)".


    1. B007VTME27
      Text in Illustration
      *a

      Front view of wire harness connector

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

      Disconnect the No. 2 CAN junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H97-1 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      H97-2 (CANL) - H23-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

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


    1. B007VTME28
      Text in Illustration
      *a

      Front view of wire harness connector

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

      Disconnect the No. 2 CAN junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H99-1 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      H99-2 (CANL) - H23-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

    REPLACE NO. 2 CAN JUNCTION CONNECTOR

  27. CONNECT CONNECTOR


    1. Reconnect the No. 2 CAN junction connector(s).


    NEXT

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


    1. B007VB5E09
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)
      *b Front view of DLC3

      Disconnect the air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H18-10 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      H18-11 (CANL) - H23-4 (CG) Ignition switch off 200 Ω or higher

    NG

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

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  29. CONNECT CONNECTOR


    1. Reconnect the No. 2 CAN junction connector(s).


    NEXT

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


    1. B007VB5E10
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Combination Meter Assembly)
      *b Front view of DLC3

      Disconnect the 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
      H20-23 (CANH) - H23-4 (CG) Ignition switch off 200 Ω or higher
      H20-22 (CANL) - H23-4 (CG) Ignition switch off 200 Ω or higher

    NG

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

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here