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

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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 54 Ω.

Symptom
Trouble Area
The resistance between terminals 6 (CANH) and 14 (CANL) of DLC3 is below 54 Ω.
  1. Short between CAN bus lines
  2. Brake actuator (skid control ECU)*1
  3. ABS and traction actuator (skid control ECU)*2
  4. Power steering ECU
  5. Steering angle sensor*4
  6. Yaw rate sensor*2
  7. ECM
  8. Center airbag sensor assembly
  9. Air conditioning amplifier
  10. Combination meter ECU
  11. Main body ECU
  12. 4WD control ECU*3
  13. No. 1 junction connector
  14. No. 2 junction connector
  15. No. 3 junction connector
  16. No. 4 junction connector
  1. *1: w/ Anti-lock Brake System
  2. *2: w/ Vehicle Stability Control System
  3. *3: for 4WD
  4. *4: for 2WD (w/ Vehicle Stability Control System) and 4WD

WIRING DIAGRAM


C194092E08


C194093E06


INSPECTION PROCEDURE

NOTICE:
  1. Turn the ignition switch off before measuring the resistance of the main wire and the branch wire.
  2. After the ignition switch is turned off, check that the key reminder warning system and light reminder buzzer are not in operation.
  3. Before measuring the resistance, leave the vehicle for at least 1 minute and do not operate the ignition switch, any switches or doors. If doors need to be opened in order to check connectors, open the doors and leave them open.

HINT:
Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.
1.DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
  1. Disconnect the cable from the negative (-) battery terminal before measuring the resistance of the main wire and the branch wire.

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

    NOTICE:
    1. w/ Navigation System (for HDD):
      After the ignition switch is turned off, the HDD navigation system requires approximately a minute to record various types of memory and settings. As a result, after turning the ignition switch off, wait a minute or higher before disconnecting the cable from the negative (-) battery terminal.
    2. When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

NEXT


2.CHECK CAN BUS LINES FOR SHORT CIRCUIT (DLC3 BRANCH WIRE)


    H100769E34
  1. Disconnect the E89 No. 4 junction connector.

  1. Measure the resistance of the DLC3.

    Standard Resistance:
    Tester Connection
    Switch Condition
    Specified Condition
    E16-6 (CANH) - E16-14 (CANL)
    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 E89 No. 4 junction connector.


NEXT


4.CHECK CAN BUS LINES FOR SHORT CIRCUIT (NO. 1 JUNCTION CONNECTOR SIDE)


    H100769E34
  1. Disconnect the A51 No. 1 junction connector.

  1. Measure the resistance of the DLC3.

    Result 
    Tester Connection
    Switch Condition
    Specified Condition
    Proceed to
    E16-6 (CANH) - E16-14 (CANL)
    Ignition switch off
    108 to 132 Ω
    B
    E16-6 (CANH) - E16-14 (CANL)
    Ignition switch off
    Other
    A


B
Go to step 22
A


5.CHECK CAN BUS LINES FOR SHORT CIRCUIT (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)


    C127797E08
  1. Disconnect the E87 No. 2 junction connector.

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

    Standard Resistance:
    Tester Connection
    Switch Condition
    Specified Condition
    E87-4 (CANH) - E87-15 (CANL)
    Ignition switch off
    6 kΩ or higher


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


6.CONNECT CONNECTOR
  1. Reconnect the A51 No. 1 junction connector.

  1. Reconnect the E87 No. 2 junction connector.


NEXT


7.CHECK CAN BUS LINES FOR SHORT CIRCUIT (NO. 1 JUNCTION CONNECTOR, NO. 2 JUNCTION CONNECTOR SIDE)


    H100769E34
  1. Disconnect the E87 No. 2 junction connector.

  1. Measure the resistance of the DLC3.

    Result 
    Tester Connection
    Switch Condition
    Specified Condition
    Proceed to
    E16-6 (CANH) - E16-14 (CANL)
    Ignition switch off
    108 to 132 Ω
    B
    E16-6 (CANH) - E16-14 (CANL)
    Ignition switch off
    Other
    A


B
Go to step 31
A


8.CHECK CAN BUS LINES FOR SHORT CIRCUIT (NO. 2 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)


    C127797E07
  1. Disconnect the E77 No. 3 junction connector.

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

    Standard Resistance:
    Tester Connection
    Switch Condition
    Specified Condition
    E77-3 (CANH) - E77-14 (CANL)
    Ignition switch off
    6 kΩ or higher


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


9.CONNECT CONNECTOR
  1. Reconnect the E87 No. 2 junction connector.

  1. Reconnect the E77 No. 3 junction connector.


NEXT


10.CHECK CAN BUS LINES FOR SHORT CIRCUIT (NO. 1 JUNCTION CONNECTOR, NO. 2 JUNCTION CONNECTOR, NO. 3 JUNCTION CONNECTOR SIDE)


    H100769E34
  1. Disconnect the E77 No. 3 junction connector.

  1. Measure the resistance of the DLC3.

    Result 
    Tester Connection
    Switch Condition
    Specified Condition
    Proceed to
    E16-6 (CANH) - E16-14 (CANL)
    Ignition switch off
    108 to 132 Ω
    B
    E16-6 (CANH) - E16-14 (CANL)
    Ignition switch off
    Other
    A


B
Go to step 37
A


11.CHECK CAN BUS LINES FOR SHORT CIRCUIT (NO. 3 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR)


    C127797E09
  1. Disconnect the E89 No. 4 junction connector.

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

    Standard Resistance:
    Tester Connection
    Switch Condition
    Specified Condition
    E89-6 (CANH) - E89-17 (CANL)
    Ignition switch off
    6 kΩ or higher


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


12.CONNECT CONNECTOR
  1. Reconnect the E77 No. 3 junction connector.

  1. Reconnect the E89 No. 4 junction connector.


NEXT


13.CHECK CAN BUS LINES FOR SHORT CIRCUIT (NO. 4 JUNCTION CONNECTOR - 4WD CONTROL ECU)

NOTICE:
For vehicles without 4WD, go to "Check CAN Bus Lines for Short Circuit (No. 4 Junction Connector - Steering Angle Sensor)".


    C127797E62
  1. Disconnect the E88 No. 4 junction connector.

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

    Result 
    Tester Connection
    Switch Condition
    Specified Condition
    Proceed to
    E88-6 (CANH) - E88-17 (CANL)
    Ignition switch off
    Below 1 Ω
    B
    E88-6 (CANH) - E88-17 (CANL)
    Ignition switch off
    Other
    A


B
Go to step 16
A


14.CHECK CAN BUS LINES FOR SHORT CIRCUIT (NO. 4 JUNCTION CONNECTOR - STEERING ANGLE SENSOR)

NOTICE:
For vehicles without 2WD with vehicle stability control system and 4WD, go to "Check CAN Bus Lines for Short Circuit (No. 4 Junction Connector - Combination Meter ECU)".


    C127797E63
  1. Measure the resistance according to the value(s) in the table below.

    Result 
    Tester Connection
    Switch Condition
    Specified Condition
    Proceed to
    E88-7 (CANH) - E88-18 (CANL)
    Ignition switch off
    Below 1 Ω
    B
    E88-7 (CANH) - E88-18 (CANL)
    Ignition switch off
    Other
    A


B
Go to step 18
A


15.CHECK CAN BUS LINES FOR SHORT CIRCUIT (NO. 4 JUNCTION CONNECTOR - COMBINATION METER ECU)


    C127797E64
  1. Measure the resistance according to the value(s) in the table below.

    Result 
    Tester Connection
    Switch Condition
    Specified Condition
    Proceed to
    E88-5 (CANH) - E88-16 (CANL)
    Ignition switch off
    Below 1 Ω
    B
    E88-5 (CANH) - E88-16 (CANL)
    Ignition switch off
    Other
    A


B
Go to step 20
A

REPAIR OR REPLACE NO. 4 JUNCTION CONNECTOR 

16.CONNECT CONNECTOR
  1. Reconnect the E88 No. 4 junction connector.


NEXT


17.CHECK CAN BUS LINES FOR SHORT CIRCUIT (4WD CONTROL ECU)


    H100769E34
  1. Disconnect the E67 4WD control ECU connector.

  1. Measure the resistance of the DLC3.

    Standard Resistance:
    Tester Connection
    Switch Condition
    Specified Condition
    E16-6 (CANH) - E16-14 (CANL)
    Ignition switch off
    54 to 69 Ω


NG
REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO 4WD CONTROL ECU (CANH, CANL)
OK

REPLACE 4WD CONTROL ECU 

18.CONNECT CONNECTOR
  1. Reconnect the E88 No. 4 junction connector.


NEXT


19.CHECK CAN BUS LINES FOR SHORT CIRCUIT (STEERING ANGLE SENSOR)


    H100769E34
  1. Disconnect the E95 steering angle sensor connector.

  1. Measure the resistance of the DLC3.

    Standard Resistance:
    Tester Connection
    Switch Condition
    Specified Condition
    E16-6 (CANH) - E16-14 (CANL)
    Ignition switch off
    54 to 69 Ω


NG
REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO STEERING ANGLE SENSOR (CANH, CANL)
OK

REPLACE STEERING ANGLE SENSOR 

20.CONNECT CONNECTOR
  1. Reconnect the E88 No. 4 junction connector.


NEXT


21.CHECK CAN BUS LINES FOR SHORT CIRCUIT (COMBINATION METER ECU)


    H100769E34
  1. Disconnect the E22 combination meter ECU connector.

  1. Measure the resistance of the DLC3.

    Standard Resistance:
    Tester Connection
    Switch Condition
    Specified Condition
    E16-6 (CANH) - E16-14 (CANL)
    Ignition switch off
    108 to 132 Ω


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

REPLACE COMBINATION METER ECU 

22.CHECK CAN BUS LINES FOR SHORT CIRCUIT (NO. 1 JUNCTION CONNECTOR - BRAKE ACTUATOR)

NOTICE:
For vehicles without anti-lock brake system, go to "Check CAN Bus Lines for Short Circuit (No. 1 Junction Connector - ABS and Traction Actuator)".


    C127797E65
  1. Measure the resistance according to the value(s) in the table below.

    Result 
    Tester Connection
    Switch Condition
    Specified Condition
    Proceed to
    A51-1 (CANH) - A51-12 (CANL)
    Ignition switch off
    Below 1 Ω
    B
    A51-1 (CANH) - A51-12 (CANL)
    Ignition switch off
    Other
    A


B
Go to step 25
A


23.CHECK CAN BUS LINES FOR SHORT CIRCUIT (NO. 1 JUNCTION CONNECTOR - ABS AND TRACTION ACTUATOR)

NOTICE:
For vehicles without vehicle stability control system, go to "Check CAN Bus Lines for Short Circuit (No. 1 Junction Connector - ECM)".


    C127797E65
  1. Measure the resistance according to the value(s) in the table below.

    Result 
    Tester Connection
    Switch Condition
    Specified Condition
    Proceed to
    A51-1 (CANH) - A51-12 (CANL)
    Ignition switch off
    Below 1 Ω
    B
    A51-1 (CANH) - A51-12 (CANL)
    Ignition switch off
    Other
    A


B
Go to step 27
A


24.CHECK CAN BUS LINES FOR SHORT CIRCUIT (NO. 1 JUNCTION CONNECTOR - ECM)


    C127797E66
  1. Measure the resistance according to the value(s) in the table below.

    Result 
    Tester Connection
    Switch Condition
    Specified Condition
    Proceed to
    A51-2 (CANH) - A51-13 (CANL)
    Ignition switch off
    Below 1 Ω
    B
    A51-2 (CANH) - A51-13 (CANL)
    Ignition switch off
    Other
    A


B
Go to step 29
A

REPAIR OR REPLACE NO. 1 JUNCTION CONNECTOR 

25.CONNECT CONNECTOR
  1. Reconnect the A51 No. 1 junction connector.


NEXT


26.CHECK CAN BUS LINES FOR SHORT CIRCUIT (BRAKE ACTUATOR)


    H100769E34
  1. Disconnect the A27 brake actuator (skid control ECU) connector.

  1. Measure the resistance of the DLC3.

    Standard Resistance:
    Tester Connection
    Switch Condition
    Specified Condition
    E16-6 (CANH) - E16-14 (CANL)
    Ignition switch off
    54 to 69 Ω


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

REPLACE BRAKE ACTUATOR (SKID CONTROL ECU) 

27.CONNECT CONNECTOR
  1. Reconnect the A51 No. 1 junction connector.


NEXT


28.CHECK CAN BUS LINES FOR SHORT CIRCUIT (ABS AND TRACTION ACTUATOR)


    H100769E34
  1. Disconnect the A67 ABS and traction actuator (skid control ECU) connector.

  1. Measure the resistance of the DLC3.

    Standard Resistance:
    Tester Connection
    Switch Condition
    Specified Condition
    E16-6 (CANH) - E16-14 (CANL)
    Ignition switch off
    54 to 69 Ω


NG
REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO ABS AND TRACTION ACTUATOR (CANH, CANL)
OK

REPLACE ABS AND TRACTION ACTUATOR (SKID CONTROL ECU) 

29.CONNECT CONNECTOR
  1. Reconnect the A51 No. 1 junction connector.


NEXT


30.CHECK CAN BUS LINES FOR SHORT CIRCUIT (ECM)


    H100769E34
  1. Disconnect the A12 ECM connector.

  1. Measure the resistance of the DLC3.

    Standard Resistance:
    Tester Connection
    Switch Condition
    Specified Condition
    E16-6 (CANH) - E16-14 (CANL)
    Ignition switch off
    108 to 132 Ω


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

REPLACE ECM 

31.CHECK CAN BUS LINES FOR SHORT CIRCUIT (NO. 2 JUNCTION CONNECTOR - YAW RATE SENSOR)

NOTICE:
For vehicles without vehicle stability control system, go to "Check CAN Bus Lines for Short Circuit (No. 2 Junction Connector - Main Body ECU)".


    C127797E67
  1. Measure the resistance according to the value(s) in the table below.

    Result 
    Tester Connection
    Switch Condition
    Specified Condition
    Proceed to
    E87-2 (CANH) - E87-13 (CANL)
    Ignition switch off
    Below 1 Ω
    B
    E87-2 (CANH) - E87-13 (CANL)
    Ignition switch off
    Other
    A


B
Go to step 33
A


32.CHECK CAN BUS LINES FOR SHORT CIRCUIT (NO. 2 JUNCTION CONNECTOR - MAIN BODY ECU)


    C127797E68
  1. Measure the resistance according to the value(s) in the table below.

    Result 
    Tester Connection
    Switch Condition
    Specified Condition
    Proceed to
    E87-5 (CANH) - E87-16 (CANL)
    Ignition switch off
    Below 1 Ω
    B
    E87-5 (CANH) - E87-16 (CANL)
    Ignition switch off
    Other
    A


B
Go to step 35
A

REPAIR OR REPLACE NO. 2 JUNCTION CONNECTOR 

33.CONNECT CONNECTOR
  1. Reconnect the E87 No. 2 junction connector.


NEXT


34.CHECK CAN BUS LINES FOR SHORT CIRCUIT (YAW RATE SENSOR)


    H100769E34
  1. Disconnect the K25 yaw rate sensor connector.

  1. Measure the resistance of the DLC3.

    Standard Resistance:
    Tester Connection
    Switch Condition
    Specified Condition
    E16-6 (CANH) - E16-14 (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 

35.CONNECT CONNECTOR
  1. Reconnect the E87 No. 2 junction connector.


NEXT


36.CHECK CAN BUS LINES FOR SHORT CIRCUIT (MAIN BODY ECU)


    H100769E34
  1. Disconnect the E20 main body ECU connector.

  1. Measure the resistance of the DLC3.

    Standard Resistance:
    Tester Connection
    Switch Condition
    Specified Condition
    E16-6 (CANH) - E16-14 (CANL)
    Ignition switch off
    54 to 69 Ω


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

REPLACE INSTRUMENT PANEL JUNCTION BLOCK (MAIN BODY ECU) 

37.CHECK CAN BUS LINES FOR SHORT CIRCUIT (NO. 3 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER)


    C127797E69
  1. Measure the resistance according to the value(s) in the table below.

    Result 
    Tester Connection
    Switch Condition
    Specified Condition
    Proceed to
    E77-2 (CANH) - E77-13 (CANL)
    Ignition switch off
    Below 1 Ω
    B
    E77-2 (CANH) - E77-13 (CANL)
    Ignition switch off
    Other
    A


B
Go to step 40
A


38.CHECK CAN BUS LINES FOR SHORT CIRCUIT (NO. 3 JUNCTION CONNECTOR - POWER STEERING ECU)


    C127797E70
  1. Measure the resistance according to the value(s) in the table below.

    Result 
    Tester Connection
    Switch Condition
    Specified Condition
    Proceed to
    E77-4 (CANH) - E77-15 (CANL)
    Ignition switch off
    Below 1 Ω
    B
    E77-4 (CANH) - E77-15 (CANL)
    Ignition switch off
    Other
    A


B
Go to step 42
A


39.CHECK CAN BUS LINES FOR SHORT CIRCUIT (NO. 3 JUNCTION CONNECTOR - CENTER AIRBAG SENSOR ASSEMBLY)


    C127797E71
  1. Measure the resistance according to the value(s) in the table below.

    Result 
    Tester Connection
    Switch Condition
    Specified Condition
    Proceed to
    E77-1 (CANH) - E77-12 (CANL)
    Ignition switch off
    Below 1 Ω
    B
    E77-1 (CANH) - E77-12 (CANL)
    Ignition switch off
    Other
    A


B
Go to step 44
A

REPAIR OR REPLACE NO. 3 JUNCTION CONNECTOR 

40.CONNECT CONNECTOR
  1. Reconnect the E77 No. 3 junction connector.


NEXT


41.CHECK CAN BUS LINES FOR SHORT CIRCUIT (AIR CONDITIONING AMPLIFIER)


    H100769E34
  1. Disconnect the E41*1 or E42*2 air conditioning amplifier connector.

    1. *1: for Automatic Air Conditioning System
    2. *2: for Manual Air Conditioning System
  1. Measure the resistance of the DLC3.

    Standard Resistance:
    Tester Connection
    Switch Condition
    Specified Condition
    E16-6 (CANH) - E16-14 (CANL)
    Ignition switch off
    54 to 69 Ω


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

REPLACE AIR CONDITIONING AMPLIFIER 

42.CONNECT CONNECTOR
  1. Reconnect the E77 No. 3 junction connector.


NEXT


43.CHECK CAN BUS LINES FOR SHORT CIRCUIT (POWER STEERING ECU)


    H100769E34
  1. Disconnect the E21 power steering ECU connector.

  1. Measure the resistance of the DLC3.

    Standard Resistance:
    Tester Connection
    Switch Condition
    Specified Condition
    E16-6 (CANH) - E16-14 (CANL)
    Ignition switch off
    54 to 69 Ω


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

REPLACE POWER STEERING ECU 

44.CONNECT CONNECTOR
  1. Reconnect the E77 No. 3 junction connector.


NEXT


45.CHECK CAN BUS LINES FOR SHORT CIRCUIT (CENTER AIRBAG SENSOR ASSEMBLY)


    H100769E34
  1. Disconnect the E49 center airbag sensor connector.

  1. Measure the resistance of the DLC3.

    Standard Resistance:
    Tester Connection
    Switch Condition
    Specified Condition
    E16-6 (CANH) - E16-14 (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