CAN COMMUNICATION SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING

Note


  • Refer to the troubleshooting section for each system if DTCs regarding the CAN communication system are not output.

  • Turn the ignition switch to OFF before measuring the resistances of the CAN main wire and the CAN branch wire.

  • After the ignition switch is turned to OFF, check that the light reminder warning system is not in operation.

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

    Tech Tips

    Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.


  1. CHECK INSTALLED SYSTEMS (ECUS AND SENSORS) THAT ADOPT CAN COMMUNICATION


    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs.

      Tech Tips


      • CAN communication DTCs are output when there is an open or short in any of the communication wires. Any problems with the power source of a corresponding ECU or sensor, or problems in the ECU or the sensor itself also cause these DTCs to be output.

      • If a CAN communication wire connector is disconnected with the ignition switch ON, the ECUs of the corresponding system and related systems record a DTC.

      Result
      Result Proceed to
      Malfunction code A
      No code B

      B

      GO TO STEP 8
      A

  3. DTC COMBINATION TABLE


    1. Confirm trouble according to the combination of output DTCs regarding the CAN communication system.


      NEXT

  4. CHECK CAN BUS LINE


    1. Check the CAN bus line Click here.


      NEXT

  5. IDENTIFY PROBLEM


    NEXT

  6. INSPECT CIRCUIT


    NEXT

  7. REPAIR OR REPLACE


    NEXT

  8. PERFORM CONFIRMATION TEST


    NEXT
    END