CAN COMMUNICATION SYSTEM DIAGNOSIS SYSTEM


  1. BUS CHECK (COMMUNICATION MALFUNCTION ECU)

    Only CAN communication system DTCs for each ECU can be output to the intelligent tester.


    1. A01BHA7

      Select "Bus Check" from the "System Select" screen on the intelligent tester.

    2. A01BD36

      Select "Communication Malfunction DTC" from the "Bus Check" screen, and then select "Enter".

    3. A01BDUP

      Select the system of the DTC to be checked and select "Details".

    4. A01BFJR

      CAN communication system DTCs are output.

  2. BUS CHECK (COMMUNICATION BUS CHECK)

    Tech Tips

    The ECUs and sensors that are properly connected to the CAN communication system can be displayed using the intelligent tester.


    1. A01BD36

      Select "Communication Bus Check" from the "Bus Check" screen.

    2. The screen displays the ECUs and sensors that are properly connected to the CAN communication system.

      Tech Tips


      • If any properly connected ECUs or sensors are not displayed, there is a communication stop in the system Click here.

      • A01BEXJ

        The default item displayed in the combo box is "ALL". When checking the ECUs (sensors) connected to each bus, pull down the combo box and select the bus to be checked from the drop-down list. The drop-down list displays "ALL", "V Bus" and the names of the remaining buses.

        Combo Box Display Content
        ALL All ECUs (sensors) connected to the CAN bus
        V Bus ECUs (sensors) connected to the V Bus
        Bus Name ECUs (sensors) connected to the selected bus

      • The connection status (shown below) is indicated by the background color displayed behind the system name.

        ECU (Sensor) on V Bus
        Background Color Connection Status
        White Detected normally
        Yellow Could not be detected in the past, but is currently detected
        Red Detected in the past, but cannot be detected now
        Yellow Could not be detected in the past, but is currently detected
        Not displayed Has never been detected
        ECU (Sensor) with no Data Monitor History
        Background Color Connection Status
        White Detected normally
        Yellow Could not be detected in the past, but is currently detected
        Red Detected in the past, but cannot be detected now
        Not displayed Has never been detected
        ECU (Sensor) with Data Monitor History
        Background Color Connection Status
        White Detected normally
        Yellow Could not be detected in the past, but is currently detected
        Red Detected in the past, but cannot be detected now
        Red Has never been detected but has connection history
        Not displayed Has never been detected and has no connection history
    3. A01BD2O

      "There is no system connected the communication bus." is displayed if there are no ECUs or sensors connected to the CAN bus.

  3. CHECK INSTALLED SYSTEMS (ECUS AND SENSORS) THAT USE CAN COMMUNICATION


    1. Systems (ECUs and sensors) that use CAN communication vary depending on the optional settings of the vehicle. Check which systems (ECUs and sensors) are installed on the vehicle.

      ECU/Sensor Name Tester Display Installed on
      ECM ECM (Engine) All vehicles
      Combination meter assembly Combination Meter All vehicles
      Air conditioning amplifier assembly Air Conditioning Amplifier For vehicles with an air conditioning system, except 5L-E
      Certification ECU (smart key ECU assembly) Certification (Smart) For vehicles with a smart entry and start system
      Headlight leveling ECU assembly Headlight swivel (AFS) For vehicles with an LED headlight

  4. DTC TABLE BY ECU

    Tech Tips


    • In the CAN communication system, CAN communication system DTCs stored by an ECU can be output by using the intelligent tester.

    • If CAN communication system DTCs are output, the trouble cannot be determined solely from the DTCs. Perform troubleshooting according to "How to Proceed with Troubleshooting" Click here.


    1. ECM

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC Code Detection Item
      U0101* Lost Communication with TCM

    2. TRANSMISSION CONTROL ECU ASSEMBLY (for 1KD-FTV, 2KD-FTV and Automatic Transmission)

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC Code Detection Item
      U0100* Lost Communication with ECM/PCM "A"

      • *: Refer to Electronic Controlled Automatic Transmission System Click here.

    3. AIR CONDITIONING AMPLIFIER ASSEMBLY (w/ Air Conditioning System, except 5L-E)

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC Code Detection Item
      B1499 Communication Malfunction (Engine&Meter ECU)

    4. COMBINATION METER ASSEMBLY

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC Code Detection Item
      U0100 Lost Communication with ECM/PCM "A"
      U0182 Lost Communication with Lighting Control Module Front

    5. CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (w/ Smart Entry and Start System)

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC Code Detection Item
      U0100 Lost Communication With ECM/PCM "A"
      U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module

    6. HEADLIGHT LEVELING ECU ASSEMBLY (for LED Headlight)

      DTC Code Detection Item
      U0100 Lost Communication with ECM/PCM "A"
      U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module
      U1000* CAN Communication Failure(Message Registry)

  5. DTC COMBINATION TABLE


    • ○: Stored.

    • X: When one side of branch wire is open, storage may occur.

    • -: Not stored.

      Output from Output DTC Detection Item Detected Communication Stop Mode
      V1 Bus
      ECM Communication Stop Mode Air Conditioning Amplifier Communication Stop Mode Combination Meter ECU Communication Stop Mode Certification ECU Communication Stop Mode AFS ECU Communication Stop Mode
      Air conditioning amplifier assembly B1499 Communication Malfunction (Engine&Meter ECU) ○ ○ ○ X X
      Combination meter assembly U0100 Lost Communication with ECM/PCM "A" ○ X ○ X X
      U0182 Lost Communication with Lighting Control Module Front X X ○ X ○
      Certification ECU (smart key ECU assembly) U0100 Lost Communication With ECM/PCM "A" ○ X X ○ X
      U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module X X ○ ○ X
      Headlight leveling ECU assembly U0100 Lost Communication with ECM/PCM "A" ○ X X X ○
      U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module X X ○ X ○