CAN COMMUNICATION SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING


  1. CHECK DTC


    1. Check DTC Click here.

      Result
      Result Proceed to
      DTCs are not output A
      U0101 is output. B
      U0001 is output. C
      U0100 is output. D

      Tech Tips



      B

      GO TO THE FLOW CHART FOR "U0101"
      C

      GO TO THE FLOW CHART FOR "U0001/A2"
      D

      GO TO THE FLOW CHART FOR "U0100/A2"
      A

  2. DIAGNOSE AND CHECK SYMPTOM


    1. Check that the air conditioning control functions (cooling, heating and dehumidification) operate normally.

      Standard
      The functions operate normally.

      Tech Tips

      This vehicle uses the CAN communication system for communication between the air conditioning amplifier and ECM. The air conditioning control functions (cooling, heating and dehumidification) stop when communication is impossible.


      YES

      CAN COMMUNICATION IS NORMAL
      NO

  3. CHECK CAN BUS LINE

    Tech Tips

    CAN bus line Click here.


    NEXT

  4. CHECK USING INTELLIGENT TESTER


    1. Select "Communication Bus Check" Click here.

      Result
      Go to step Result
      A "Engine", "ECT (*1)", and "A/C" are displayed.
      B "Engine" and "ECT (*1)" are not displayed ("A/C" is displayed)
      C "A/C" is not displayed ("Engine" and "ECT (*1)" are displayed).
      D "Engine", "ECT (*1)", and "A/C" are not displayed.

      Tech Tips


      • *1: Installed on only automatic transmission vehicle with 1KD-FTV or 2KD-FTV engines.

      • C: "Air Conditioning Amplifier Communication Stop Mode" Click here

      • D: "Open in One Side of CAN Sub Bus Line" Click here


      B

      REPLACE ECM
      C

      GO TO "AIR CONDITIONING AMPLIFIER COMMUNICATION STOP MODE"
      D

      GO TO "OPEN IN ONE SIDE OF CAN SUB BUS LINE"
      A
      GO TO" AIR CONDITIONING SYSTEM"