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. A01IRVQ

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

    2. A01IPYA

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

    3. A01IR0M

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

    4. A01IPNU

      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. A01IPYA

      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.

      • A01ISF6

        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
        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. A01IPUA

      "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
      Brake actuator assembly (VSC ECU) Skid Control (ABS/VSC/TRAC) All vehicles
      Yaw rate sensor Yaw Rate Sensor All vehicles
      Spiral cable sub-assembly (steering angle sensor) Spiral cable (Steering Angle Sensor) All vehicles
      Power steering ECU assembly Power Steering (EPS) All vehicles
      Air conditioning amplifier assembly Air Conditioning Amplifier All vehicles
      Center airbag sensor assembly Airbag All vehicles
      Certification ECU Certification (Smart) Vehicles with an entry and start system
      Main body ECU (instrument panel junction block assembly) Main Body All vehicles
      Combination meter assembly Combination Meter All vehicles
      Power management control ECU

      • Power Management1

      • Power Management2

      		 All vehicles
      Radio and display receiver assembly Display and Navigation (AVN1) Vehicles with a radio and display type

  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".


    1. BRAKE ACTUATOR ASSEMBLY (VSC ECU)

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC Code Detection Item
      U0073 Control Module Communication Bus OFF
      U0100 Lost Communication with ECM/PCM "A"
      U0123 Lost Communication with Yaw Rate Sensor Module
      U0126 Lost Communication with Steering Angle Sensor Module

    2. ECM/ECT

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC Code Detection Item
      U0129 Lost Communication with Brake System Control Module

    3. MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) (for RHD)

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC Code Detection Item
      U0100 Lost Communication with ECM/PCM "A"
      U0101 Lost Communication with TCM
      U0151 Lost Communication with Restraints Control Module
      U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module
      U0327 Software Incompatibility with Vehicle Security Control Module
      U1133 Lost Communication with PMN Module

    4. COMBINATION METER ASSEMBLY

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC Code Detection Item
      U0100 Lost Communication with ECM/PCM "A"
      U0129 Lost Communication with Brake System Control Module
      U0131 Lost Communication with Power Steering Control Module
      U0151 Lost Communication with Restraints Control Module

    5. CERTIFICATION ECU


      • For vehicles with an entry and start system.

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC Code Detection Item
      U0100 Lost Communication with ECM/PCM "A"
      U0142 Lost Communication with Body Control Module "B"
      U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module

    6. AIR CONDITIONING AMPLIFIER ASSEMBLY

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC Code Detection Item
      U0100 Communication Malfunction (Engine ECU)
      U0131 Communication Malfunction (Electric Power Steering ECU)
      U0142 Communication Malfunction (Main Body ECU)
      U0155 Communication Malfunction (Meter ECU)

    7. POWER STEERING ECU ASSEMBLY

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC Code Detection Item
      U0100 Lost Communication with ECM/PCM "A"
      U0129 Lost Communication with Brake System Control Module

    8. POWER MANAGEMENT CONTROL ECU (Push Start)


      • For vehicles an entry and start system.

      Tech Tips

      DTC communication uses the CAN communication system.

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

    9. POWER MANAGEMENT CONTROL ECU (PM Gateway)


      • For vehicles an entry and start system.

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC Code Detection Item
      U0100 Lost Communication with ECM/PCM "A"
      U0164 Lost Communication with HVAC Control Module
      U1002 Lost Communication with Gateway Module (Power Management Bus)

    10. RADIO AND DISPLAY RECEIVER ASSEMBLY


      • For vehicles with a radio and display type.

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC Code Detection Item
      U0073 Sending Malfunction (Navigation to APGS)
      U0100 Engine ECU Communication
      U0129 VSC(ECB*)ECU Communication
      U0140 Lost Communication with Body Control Module
      U0155 Meter ECU Communication
      U0164 Air Conditioner ECU Communication

      • ECB*: Electrically Controlled Brake System

    11. CENTER AIRBAG SENSOR ASSEMBLY

      Tech Tips

      The center airbag sensor assembly is connected to the CAN communication system but CAN communication DTCs are not stored.

    12. POSITION CONTROL ECU ASSEMBLY


      • For vehicles with a seat position memory system.

      Tech Tips

      The position control ECU and switch is connected to the CAN communication system but CAN communication DTCs are not stored.

    13. YAW RATE SENSOR

      Tech Tips

      The yaw rate sensor is connected to the CAN communication system but CAN communication DTCs are not stored.

    14. SPIRAL CABLE SUB-ASSEMBLY (STEERING ANGLE SENSOR)

      Tech Tips

      The steering angle sensor is connected to the CAN communication system but CAN communication DTCs are not stored.

  5. DTC COMBINATION TABLE

    Tech Tips


    • ○: Stored.

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

    • -: Not stored.

    • *1: Only stored when communication recovery has occurred. During communication stop, cannot be stored.

    • *2: for RHD

    • *3: Only stored when all ECUs connected to power management bus stop communicating

    • *4: w/ Entry and Start System

    • *5: w/o Entry and Start System

    Output from Output DTC Detection Item Detected Communication Stop Mode
    V1 Bus
    Center Airbag Sensor Communication Stop Mode Main Body ECU Communication Stop Mode Air Conditioning Amplifier*5 Communication Stop Mode ECM Communication Stop Mode
    Certification ECU*4 U0100 Lost Communication with ECM/PCM "A" X X X ○
    U0142 Lost Communication with Body Control Module "B" X ○ X X
    U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module X X X X
    Main body ECU (instrument panel junction block assembly)*2 U0100 Lost Communication with ECM/PCM "A" X ○*1 X ○
    U0101 Lost Communication with TCM X ○*1 X ○
    U0151 Lost Communication with Restraints Control Module ○ ○*1 X X
    U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module X ○*1 X X
    U0327 Software Incompatibility with Vehicle Security Control Module X ○*1 X X
    U1133 Lost Communication with PMN Module X ○*1 X X
    Combination meter assembly U0100 Lost Communication with ECM/PCM "A" X X X ○
    U0129 Lost Communication with Brake System Control Module X X X X
    U0131 Lost Communication with Power Steering Control Module X X X X
    U0151 Lost Communication with Restraints Control Module ○ X X X
    Air conditioning amplifier assembly U0100 Communication Malfunction (Engine ECU) X X ○*1 ○
    U0131 Communication Malfunction (Electric Power Steering ECU) X X ○*1 X
    U0142 Communication Malfunction (Main Body ECU) X ○ ○*1 X
    U0155 Communication Malfunction (Meter ECU) X X ○*1 X
    ECM U0129 Lost Communication with Brake System Control Module X X X ○*1
    Power management ECU (Push Start)*4 U0100 Lost Communication with ECM/PCM "A" X X X ○
    Power management ECU (PM Gateway)*4 U0100 Lost Communication with ECM/PCM "A" - - - -
    U0164 Lost Communication with HVAC Control Module - - - -
    U1002 Lost Communication with Gateway Module (Power Management Bus) - - - -
    Brake actuator assembly (VSC ECU) U0073 Control Module Communication Bus OFF X X X X
    U0100 Lost Communication with ECM/PCM "A" X X X ○
    U0123 Lost Communication with Yaw Rate Sensor Module X X X X
    U0126 Lost Communication with Steering Angle Sensor Module X X X X
    Power steering ECU assembly U0100 Lost Communication with ECM/PCM "A" X X X ○
    U0129 Lost Communication with Brake System Control Module X X X X
    Radio and display receiver assembly U0073 Sending Malfunction (Navigation to APGS) X X X X
    U0100 Engine ECU Communication X X X ○
    U0129 VSC(ECB*)ECU Communication X X X X
    U0140 Lost Communication with Body Control Module X ○ X X
    U0155 Meter ECU Communication X X X X
    U0164 Air Conditioner ECU Communication X X ○ X
    Output from Output DTC Detection Item Detected Communication Stop Mode
    V1 Bus
    Power Steering ECU Communication Stop Mode Certification ECU*4 Communication Stop Mode Combination Meter ECU Communication Stop Mode Power Management ECU*4 Communication Stop Mode
    Certification ECU*4 U0100 Lost Communication with ECM/PCM "A" X ○*1 X X
    U0142 Lost Communication with Body Control Module "B" X ○*1 X X
    U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module X ○*1 ○ X
    Main body ECU (instrument panel junction block assembly)*2 U0100 Lost Communication with ECM/PCM "A" X X X X
    U0101 Lost Communication with TCM X X X X
    U0151 Lost Communication with Restraints Control Module X X X X
    U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module X X ○ X
    U0327 Software Incompatibility with Vehicle Security Control Module X ○ X X
    U1133 Lost Communication with PMN Module X X X ○
    Combination meter assembly U0100 Lost Communication with ECM/PCM "A" X X ○*1 X
    U0129 Lost Communication with Brake System Control Module X X ○*1 X
    U0131 Lost Communication with Power Steering Control Module ○ X ○*1 X
    U0151 Lost Communication with Restraints Control Module X X ○*1 X
    Air conditioning amplifier assembly U0100 Communication Malfunction (Engine ECU) X X X ○*1
    U0131 Communication Malfunction (Electric Power Steering ECU) ○ X X ○*1
    U0142 Communication Malfunction (Main Body ECU) X X X ○*1
    U0155 Communication Malfunction (Meter ECU) X X ○ ○*1
    ECM U0129 Lost Communication with Brake System Control Module X X X X
    Power management ECU (Push Start)*4 U0100 Lost Communication with ECM/PCM "A" X X X ○*1
    Power management ECU (PM Gateway)*4 U0100 Lost Communication with ECM/PCM "A" - - - -
    U0164 Lost Communication with HVAC Control Module - - - -
    U1002 Lost Communication with Gateway Module (Power Management Bus) - - - -
    Brake actuator assembly (VSC ECU) U0073 Control Module Communication Bus OFF X X X X
    U0100 Lost Communication with ECM/PCM "A" X X X X
    U0123 Lost Communication with Yaw Rate Sensor Module X X X X
    U0126 Lost Communication with Steering Angle Sensor Module X X X X
    Power steering ECU assembly U0100 Lost Communication with ECM/PCM "A" ○*1 X X X
    U0129 Lost Communication with Brake System Control Module ○*1 X X X
    Radio and display receiver assembly U0073 Sending Malfunction (Navigation to APGS) X X X X
    U0100 Engine ECU Communication X X X X
    U0129 VSC(ECB*)ECU Communication X X X X
    U0140 Lost Communication with Body Control Module X X X X
    U0155 Meter ECU Communication X X ○ X
    U0164 Air Conditioner ECU Communication X X X X
    Output from Output DTC Detection Item Detected Communication Stop Mode
    V1 Bus
    Brake Actuator (VSC ECU) Communication Stop Mode Steering Angle Sensor Communication Stop Mode Yaw Rate Sensor Communication Stop Mode Display and Navigation Receiver Assembly Communication Stop Mode
    Certification ECU*4 U0100 Lost Communication with ECM/PCM "A" X X X X
    U0142 Lost Communication with Body Control Module "B" X X X X
    U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module X X X X
    Main body ECU (instrument panel junction block assembly)*2 U0100 Lost Communication with ECM/PCM "A" X X X X
    U0101 Lost Communication with TCM X X X X
    U0151 Lost Communication with Restraints Control Module X X X X
    U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module X X X X
    U0327 Software Incompatibility with Vehicle Security Control Module X X X X
    U1133 Lost Communication with PMN Module X X X X
    Combination meter assembly U0100 Lost Communication with ECM/PCM "A" X X X X
    U0129 Lost Communication with Brake System Control Module ○ X X X
    U0131 Lost Communication with Power Steering Control Module X X X X
    U0151 Lost Communication with Restraints Control Module X X X X
    Air conditioning amplifier assembly U0100 Communication Malfunction (Engine ECU) X X X X
    U0131 Communication Malfunction (Electric Power Steering ECU) X X X X
    U0142 Communication Malfunction (Main Body ECU) X X X X
    U0155 Communication Malfunction (Meter ECU) X X X X
    ECM U0129 Lost Communication with Brake System Control Module ○ X X X
    Power management ECU (Push Start)*4 U0100 Lost Communication with ECM/PCM "A" X X X X
    Power management ECU (PM Gateway)*4 U0100 Lost Communication with ECM/PCM "A" - - - -
    U0164 Lost Communication with HVAC Control Module - - - -
    U1002 Lost Communication with Gateway Module (Power Management Bus) - - - -
    Brake actuator assembly (VSC ECU) U0073 Control Module Communication Bus OFF ○*1 X X X
    U0100 Lost Communication with ECM/PCM "A" ○*1 X X X
    U0123 Lost Communication with Yaw Rate Sensor Module ○*1 X ○ X
    U0126 Lost Communication with Steering Angle Sensor Module ○*1 ○ X X
    Power steering ECU assembly U0100 Lost Communication with ECM/PCM "A" X X X X
    U0129 Lost Communication with Brake System Control Module ○ X X X
    Radio and display receiver assembly U0073 Sending Malfunction (Navigation to APGS) X X X ○*1
    U0100 Engine ECU Communication X X X ○*1
    U0129 VSC(ECB*)ECU Communication ○ X X ○*1
    U0140 Lost Communication with Body Control Module X X X ○*1
    U0155 Meter ECU Communication X X X ○*1
    U0164 Air Conditioner ECU Communication X X X ○*1
    Output from Output DTC Detection Item Detected Communication Stop Mode
    Power Management Bus*4
    ECM Communication Stop Mode Air Conditioning Amplifier Communication Stop Mode Power Management ECU Communication Stop Mode
    Certification ECU*4 U0100 Lost Communication with ECM/PCM "A" - - -
    U0142 Lost Communication with Body Control Module "B" - - -
    U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module - - -
    Main body ECU (instrument panel junction block assembly)*2 U0100 Lost Communication with ECM/PCM "A" - - -
    U0101 Lost Communication with TCM - - -
    U0151 Lost Communication with Restraints Control Module - - -
    U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module - - -
    U0327 Software Incompatibility with Vehicle Security Control Module - - -
    U1133 Lost Communication with PMN Module - - -
    Combination meter assembly U0100 Lost Communication with ECM/PCM "A" - - -
    U0129 Lost Communication with Brake System Control Module - - -
    U0131 Lost Communication with Power Steering Control Module - - -
    U0151 Lost Communication with Restraints Control Module - - -
    Air conditioning amplifier assembly U0100 Communication Malfunction (Engine ECU) X ○*1 ○*1
    U0131 Communication Malfunction (Electric Power Steering ECU) X ○*1 ○*1
    U0142 Communication Malfunction (Main Body ECU) X ○*1 ○*1
    U0155 Communication Malfunction (Meter ECU) X ○*1 ○*1
    ECM U0129 Lost Communication with Brake System Control Module - - -
    Power management ECU (Push Start)*4 U0100 Lost Communication with ECM/PCM "A" - - -
    Power management ECU (PM Gateway)*4 U0100 Lost Communication with ECM/PCM "A" ○ X ○*1
    U0164 Lost Communication with HVAC Control Module X ○ ○*1
    U1002 Lost Communication with Gateway Module (Power Management Bus) ○*3 ○*3 ○*1
    Brake actuator assembly (VSC ECU) U0073 Control Module Communication Bus OFF - - -
    U0100 Lost Communication with ECM/PCM "A" - - -
    U0123 Lost Communication with Yaw Rate Sensor Module - - -
    U0126 Lost Communication with Steering Angle Sensor Module - - -
    Power steering ECU assembly U0100 Lost Communication with ECM/PCM "A" - - -
    U0129 Lost Communication with Brake System Control Module - - -
    Radio and display receiver assembly U0073 Sending Malfunction (Navigation to APGS) - - -
    U0100 Engine ECU Communication - - -
    U0129 VSC(ECB*)ECU Communication - - -
    U0140 Lost Communication with Body Control Module - - -
    U0155 Meter ECU Communication - - -
    U0164 Air Conditioner ECU Communication - - -