CAN COMMUNICATION SYSTEM DIAGNOSIS SYSTEM


  1. ECUS OR SENSORS WHICH COMMUNICATE THROUGH CAN COMMUNICATION SYSTEM


    1. CAN No. 1 Bus


      1. ECM

      2. Power management control ECU

      3. Combination meter

      4. Main body ECU

      5. Power steering ECU

      6. Center airbag sensor assembly

      7. Skid control ECU (Brake booster with master cylinder)

      8. Steering angle sensor

      9. Yaw rate sensor

      10. Certification ECU

      11. Transmission control ECU

      12. Navigation ECU (Navigation receiver assembly)*1

    2. CAN No. 2 Bus


      1. Power management control ECU

      2. Driving support ECU*2

      3. Seat belt control ECU*3

      4. Parking assist ECU*4

    3. Power Management Bus


      1. Power management control ECU

      2. ECM

      3. Skid control ECU (Brake booster with master cylinder)

      4. Air conditioning amplifier

    4. Driving Support Bus*2


      1. Driving support ECU

      2. Millimeter wave radar sensor

        Tech Tips

        *1: w/ Navigation system

        *2: w/ Dynamic radar cruise control system

        *3: w/ Pre-crash safety system

        *4: w/ Intelligent parking assist system

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


    1. The systems (ECUs and sensors) that adopt CAN communication vary depending on the vehicle and optional equipment. Check which systems (ECUs and sensors) are installed on the vehicle.

      ECU/Sensor Name Intelligent Tester Display Applicability
      ECM Engine Installed on all vehicles
      Power management ECU

      • Hybrid Control

      • Power Management1

      		 Installed on all vehicles
      Transmission control ECU Transmission Control Installed on all vehicles
      Combination meter Combination Meter Installed on all vehicles
      Main body ECU Main Body Installed on all vehicles
      Power steering ECU EPS Installed on all vehicles
      Skid control ECU ABS/VSC/TRC Installed on all vehicles
      Steering angle sensor Steering Angle Sensor Installed on all vehicles
      Yaw rate sensor Yaw Rate/Deceleration Sensor Installed on all vehicles
      Center airbag sensor assembly SRS Airbag Installed on all vehicles
      Certification ECU Entry and Start/Wireless Tuner Installed on all vehicles
      Air conditioning amplifier Air Conditioner Installed on all vehicles
      Navigation ECU AVN1 w/ Navigation system
      Driving support ECU Cruise Control (ACC) w/ Dynamic radar cruise control system
      Millimeter wave radar sensor - w/ Dynamic radar cruise control system
      Seat belt control ECU Pre-Crash1 w/ Pre-crash safety system
      Parking assist ECU Intelligent Parking Assist w/ Intelligent parking assist system

  3. BUS CHECK (COMMUNICATION MALFUNCTION DTC)

    Tech Tips

    Only CAN communication system DTCs for each ECU can be displayed on the intelligent tester.


    1. A01JC2I

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

    2. A01J8MB

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

    3. A01JBYU

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

  4. 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. A01JC2I

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

    2. A01J8MB

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

    3. A01JBYU

      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.

    4. A01JBXO

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

  5. DTC TABLE BY ECU

    Tech Tips


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

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


    1. Power Management Control ECU / Intelligent tester Display "Hybrid Control"

      DTC Code Detection Item
      U0100-211 Lost Communication with ECM/PCM "A"
      U0100-212 Lost Communication with ECM/PCM "A"
      U0100-530 Lost Communication with ECM/PCM "A"
      U0122-732*1 Lost Communication with Vehicle Dynamic Control Module
      U0129-220 Lost Communication with Brake System Control Module
      U0129-222 Lost Communication with Brake System Control Module
      U0129-527 Lost Communication with Brake System Control Module
      U0129-528 Lost Communication with Brake System Control Module
      U0140-146 Communication Error from Body ECU to HV ECU
      U0151-763 Communication Error from Airbag ECU to HV ECU
      U0164-594 Communication Error from A/C ECU to HV ECU
      U0164-827 Communication Error from A/C ECU to HV ECU
      U1104-728 Lost Communication with Driving Support ECU
      U1107-436 Lost Communication with Power Management Module

      Tech Tips


      • DTC communication uses the CAN communication system.

      • *1: Dynamic radar cruise control system DTC

    2. Power Management Control ECU / Intelligent tester Display "Electric Power Control"

      DTC Code Detection Item
      U0129 Vehicle Speed Signal Communication
      U0140 Lost Communication with Body Control Module
      U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module
      U0293*2 HV ECU Communication

      Tech Tips


      • DTC communication uses the CAN communication system.

      • *2: If U0293 is output alone, CAN communication is normal. Refer to Entry and start System Click here.

    3. Power Management Control ECU / Intelligent tester Display "Power Management1"

      DTC Code Detection Item
      U0104 Lost Communication with Cruise Control Module
      U1002 Lost Communication with Gateway Module
      U1100 Lost Communication with Pre-Crash Module
      U110B Lost Communication with Parking Assist Control Module "B"

      Tech Tips


      • DTC communication uses the CAN communication system.

      • "Power Management1" output DTC is communication error in the CAN No. 2 bus.

    4. Power Management Control ECU / Intelligent tester Display "Power Management2"

      DTC Code Detection Item
      U0100 Lost Communication with ECM / PCM
      U0129 Lost Communication with Brake System Control Module
      U0164 Lost Communication with HVAC Control Module
      U1002 Lost Communication with Gateway Module

      Tech Tips


      • DTC communication uses the CAN communication system.

      • "Power Management2" output DTC is communication error in the power management bus.

    5. ECM / Intelligent tester Display "Engine"

      DTC Code Detection Item
      U0293 Lost Communication with Hybrid Vehicle Control System

      Tech Tips

      DTC communication uses the CAN communication system.

    6. Transmission Control ECU/ Intelligent tester Display "Transmission Control"

      DTC Code Detection Item
      U0146 Lost Communication with Body ECU

      Tech Tips

      DTC communication uses the CAN communication system.

    7. Power Steering ECU / Intelligent tester Display "EPS"

      DTC Code Detection Item
      U0129 Lost Communication with Brake System Control Module
      U0293 Lost Communication with Hybrid Control Module
      U1104 Lost Communication with Driving Support ECU
      U1105 Lost Communication with Parking Assist ECU

      Tech Tips

      DTC communication uses the CAN communication system.

    8. Skid control ECU (Brake booster with master cylinder) / Intelligent tester Display "ABS/VSC/TRC"

      DTC Code Detection Item
      U0073 Control Module Communication Bus OFF
      U0123 Lost Communication with Yaw Rate Sensor Module
      U0124 Lost Communication with Lateral Acceleration Sensor Module
      U0126 Lost Communication with Steering Angle Sensor Module
      U0293 Lost Communication with Hybrid Vehicle Control System

      Tech Tips

      DTC communication uses the CAN communication system.

    9. Steering Angle Sensor / Intelligent tester Display "Steering Angle Sensor"

      Tech Tips

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

    10. Yaw Rate Sensor / Intelligent tester Display "Yaw Rate / Deceleration Sensor"

      Tech Tips

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

    11. Center Airbag Sensor Assembly / Intelligent tester Display "SRS Airbag"

      Tech Tips

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

    12. Main Body ECU (w/ LED Headlight System or w/ Remote Air Conditioning System) / Intelligent tester Display "Main Body"

      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
      U0164 Lost Communication with HVAC Control Module
      U0293 Lost Communication with Hybrid Powertrain Control Module
      U0327 Software Incompatibility with Vehicle Security
      U1133 Lost Communication with PMN Module

      Tech Tips

      DTC communication uses the CAN communication system.

    13. Main Body ECU (w/o LED Headlight System and w/o Remote Air Conditioning System) / Intelligent tester Display "Main Body"

      Tech Tips

      The main body ECU (w/o LED Headlight System and w/o Remote Air Conditioning System) is connected to the CAN communication system, but CAN communication DTCs are not output.

    14. Certification ECU / Intelligent tester Display "Entry and Start/ Wireless Tuner"

      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
      U0293 Lost Communication with HV ECU

      Tech Tips

      DTC communication uses the CAN communication system.

    15. Air Conditioning Amplifier / Intelligent tester Display "Air Conditioner"

      DTC Code Detection Item
      U0100 Communication Malfunction (Engine ECU)
      U0101 Lost Communication with TCM
      U0131 Communication Malfunction (Electric Power Steering ECU)
      U0142 Communication Malfunction (Main body ECU)
      U0155 Communication Malfunction (Meter ECU)
      U0293 Communication Malfunction (Navigation ECU)

      Tech Tips

      DTC communication uses the CAN communication system.

    16. Combination Meter / Intelligent tester Display "Combination Meter"

      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
      U0142 Lost Communication with Body Control Module "B"
      U0151 Lost Communication with Restraints Control Module

      Tech Tips

      DTC communication uses the CAN communication system.

    17. Navigation ECU (Navigation receiver assembly) / Intelligent tester Display "AVN1"

      DTC Code Detection Item
      U0073 Sending Malfunction (Navigation to APGS)

      Tech Tips

      DTC communication uses the CAN communication system.

    18. Seat Belt Control ECU / Intelligent tester Display "Pre-Crash1"

      DTC Code Detection Item
      U0122 Lost Communication with Vehicle Dynamics Control Module
      U0140 Lost Communication with J/B ECU
      U0151 Lost Communication with SRS Airbag ECU
      U1104 Lost Communication with Driving Support ECU

      Tech Tips

      DTC communication uses the CAN communication system.

    19. Driving Support ECU / Intelligent tester Display "Pre-Crash2"

      DTC Code Detection Item
      U0122 Lost Communication with Vehicle Dynamics Control Module
      U0123 Lost Communication with Yaw Rate Sensor Module
      U0126 Lost Communication with Steering Angle Sensor Module
      U0235*3 Lost Communication with Cruise Control Front Distance Range Sensor
      U0293 Lost Communication with Hybrid Vehicle Control System
      U1002 Lost Communication with Gateway Module
      U1100 Lost Communication with Pre-Crash Module
      U1104 Lost Communication with Driving Support ECU
      U1119

      Tech Tips


      • DTC communication uses the CAN communication system.

      • *3: If U0235 is output alone, CAN communication is normal. Refer to Dynamic Radar Cruise Control System Click here.

    20. Driving Support ECU / Intelligent tester Display "Cruise Control (ACC)"

      DTC Code Detection Item
      U0122 Lost Communication with Vehicle Dynamics Control Module
      U0123 Lost Communication with Yaw Rate Sensor Module
      U0126 Lost Communication with Steering Angle Sensor Module
      U0235*3 Lost Communication with Cruise Control Front Distance Range Sensor
      U0293 Lost Communication with Hybrid Vehicle Control System
      U1104 Lost Communication with Driving Support ECU

      Tech Tips


      • DTC communication uses the CAN communication system.

      • *3: If U0235 is output alone, CAN communication is normal. Refer to Dynamic Radar Cruise Control System Click here.

    21. Parking Assist ECU / Intelligent tester Display "Intelligent Parking Assist"

      DTC Code Detection Item
      U0073 Control Module Communication Bus Off
      U0126 Lost Communication with Steering Angle Sensor Module
      U0129 Lost Communication with Brake System Control Module
      U0131 Lost Communication with Power Steering Control Module
      U0140 Lost Communication with Body Control Module
      U0293 Lost Communication with Hybrid Control Module
      U1000*4 CAN Communication Failure (Message Registry)

      Tech Tips


      • DTC communication uses the CAN communication system.

      • *4: If U1000 is output alone, CAN communication is normal. Refer to Parking Assist System Click here.

    22. Millimeter Wave Radar Sensor

      Tech Tips

      The millimeter wave radar sensor is connected to the CAN communication system, but CAN communication DTCs are not output.

  6. DTC COMBINATION TABLE


    1. CAN No. 1 Bus

      DTC Trouble Mode
      Output ECU Output DTC Power Management ECU Communication Stop Mode ECM Communication Stop Mode Main Body ECU Communication Stop Mode Combination Meter ECU Communication Stop Mode

      Power management control ECU

      (Hybrid Control)

      		 U0100 ○*1 ○ X X
      U0122 ○*1 X X X
      U0129 ○*1 X X X
      U0140 ○*1 X ○ X
      U0151 ○*1 X X X
      O1107 ○*1 X X X

      Power management control ECU

      (Electric Power Control)

      		 U0129 ○*1 X X X
      U0140 ○*1 X ○ X
      U0155 ○*1 X X ○
      U0293 ○ X X X
      ECM U0293 ○ ○*1 X X
      Transmission control ECU U0146 X X ○ X
      Main body ECU*3 U0100 X ○ ○*1 X
      U0101 ○ X ○*1 X
      U0151 X X ○*1 X
      U0155 X X ○*1 ○
      U0164 ○*4 X ○*1 X
      U0293 ○ X ○*1 X
      U0327 X X ○*1 X
      U1133 ○ X ○*1 X
      Combination meter U0100 X ○ X ○*1
      U0129 X X X ○*1
      U0131 ○ X X ○*1
      U0142 X X ○ ○*1
      U0151 X X X ○*1
      Skid control ECU U0073 X X X X
      U0123 X X X X
      U0124 X X X X
      U0126 X X X X
      U0293 ○ X X X
      Power steering ECU U0129 X X X X
      U0293 ○ X X X
      U1104 ○*5 X X X
      U1105 ○*5 X X X
      Certification ECU U0100 X ○ X X
      U0142 X X ○ X
      U0155 X X X ○
      U0293 ○ X X X
      Navigation ECU U0073 X X X X
      DTC Trouble Mode
      Output ECU Output DTC Power Steering ECU Communication Stop Mode Skid Control ECU Communication Stop Mode Steering Angle Sensor Communication Stop Mode Yaw Rate Sensor Communication Stop Mode

      Power management control ECU

      (Hybrid Control)

      		 U0100 X X X X
      U0122 X ○ X X
      U0129 X ○ X X
      U0140 X X X X
      U0151 X X X X
      U1107 X X X X

      Power management control ECU

      (Electric Power Control)

      		 U0129 X ○ X X
      U0140 X X X X
      U0155 X X X X
      U10293 X X X X
      ECM U0293 X X X X
      Transmission control ECU U0146 X X X X
      Main body ECU*3 U0100 X X X X
      U0101 X X X X
      U0151 X X X X
      U0155 X X X X
      U0164 X X X X
      U0293 X X X X
      U0327 X X X X
      U1133 X X X X
      Combination meter U0100 X X X X
      U0129 X ○ X X
      U0131 ○ X X X
      U0142 X X X X
      U0151 X X X X
      Skid control ECU U0073 X ○*1, 2 X ○
      U0123 X ○*1 X ○
      U0124 X ○*1 X ○
      U0126 X ○*1 ○ X
      U0293 X ○*1 X X
      Power steering ECU U0129 ○*1 ○ ○ ○
      U0293 ○*1 X X X
      U1104 ○*1 X X X
      U1105 ○*1 X X X
      Certification ECU U0100 X X X X
      U0142 X X X X
      U0155 X X X X
      U0293 X X X X
      Navigation ECU U0073 X X X X
      DTC
      Output ECU Output DTC Center Airbag Sensor Communication Stop Mode Certification ECU Communication Stop Mode Transmission control Communication Stop Mode Navigation ECU Communication Stop Mode

      Power management control ECU

      (Hybrid Control)

      		 U0100 X X X X
      U0122 X X X X
      U0129 X X X X
      U0140 X X X X
      U0151 ○ X X X
      U1107 X X X X

      Power management control ECU

      (Electric Power Control)

      		 U0129 X X X X
      U0140 X X X X
      U0155 X X X X
      U0293 X X X X
      ECM U0293 X X X X
      Transmission control ECU U0146 X X ○*1 X
      Main body ECU*3 U0100 X X X X
      U0101 X X X X
      U0151 ○ X X X
      U0155 X X X X
      U0164 X X X X
      U0293 X X X X
      U0327 X ○ X X
      U1133 X X X X
      Combination meter U0100 X X X X
      U0129 X X X X
      U0131 X X X X
      U0142 X X X X
      U0151 ○ X X X
      Skid control ECU U0073 X X X X
      U0123 X X X X
      U0124 X X X X
      U0126 X X X X
      U0293 X X X X
      Power steering ECU U0129 X X X X
      U0293 X X X X
      U1104 X X X X
      U1105 X X X X
      Certification ECU U0100 X ○*1 X X
      U0142 X ○*1 X X
      U0155 X ○*1 X X
      U0293 X ○*1 X X
      Navigation ECU U0073 X X X ○*1

      Tech Tips


      • ○: Set

      • X: Not set or may be set according to the malfunctioning part when one side of the CAN branch wire opens.

      • *1: DTC is not output during communication error, but will be output as a history DTC (past DTC) when communication returns to normal.

      • *2: DTC U0100, U0123, U0124 and U0126 are not stored when DTC U0073 has already been stored.

      • *3: w/ LED headlight system or w/ remote air conditioning system

      • *4: If the power management bus circuit is normal

      • *5: If the CAN No. 2 bus circuit is normal

      • Skid Control ECU Communication Stop Mode Click here

      • Power Steering ECU Communication Stop Mode Click here

      • Steering Angle Sensor Communication Stop Mode Click here

      • Yaw Rate Sensor Communication Stop Mode Click here

      • ECM Communication Stop Mode Click here

      • Transmission Control ECU Communication Stop Mode Click here

      • Main Body ECU Communication Stop Mode Click here

      • Combination Meter ECU Communication Stop Mode Click here

      • Center Airbag Sensor Communication Stop Mode Click here

      • Certification ECU Communication Stop Mode Click here

      • Power Management ECU Communication Stop Mode Click here