CAN COMMUNICATION SYSTEM DIAGNOSIS SYSTEM


  1. ECUS OR SENSORS WHICH COMMUNICATE THROUGH CAN COMMUNICATION SYSTEM


    1. V1 Bus


      1. ECM

      2. Skid control ECU (Brake booster with master cylinder assembly)

      3. Main body ECU (Multiplex network body ECU)

      4. Yaw rate and acceleration sensor

      5. Power steering ECU assembly

      6. Certification ECU (Smart key ECU assembly)

      7. Airbag sensor assembly

      8. Steering angle sensor (Spiral cable with sensor sub-assembly)

      9. Transmission control ECU assembly

      10. Power management control ECU

      11. Combination meter assembly

      12. Navigation ECU (Display and navigation module display)*1

      13. Navigation ECU (Navigation computer sub-assembly)*2

    2. V2 Bus


      1. Power management control ECU

      2. Driving support ECU assembly*3

      3. Seat belt control ECU*4

      4. Parking assist ECU*1*2

      5. Clearance warning ECU assembly*5

    3. Power Management Bus


      1. Power management control ECU

      2. ECM

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

      4. Air conditioning amplifier assembly

    4. CAN MS Bus


      1. Main body ECU (Multiplex network body ECU)

      2. Position control ECU and switch assembly*6

      3. Outer mirror control ECU assembly (Driver side)*6

      4. Outer mirror control ECU assembly (Front passenger side)*6

        Tech Tips

        *1: w/ Navigation system (for DVD)

        *2: w/ Navigation system (for HDD)

        *3: w/ Dynamic radar cruise control system

        *4: w/ Pre-crash safety system

        *5: w/ LEXUS parking assist sensor system

        *6: w/ Seat position memory

  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 assembly Transmission Control Installed on all vehicles
      Combination meter assembly Combination Meter Installed on all vehicles
      Main body ECU (Multiplex network body ECU) Main Body Installed on all vehicles
      Power steering ECU assembly EPS Installed on all vehicles
      Skid control ECU (Brake booster with master cylinder assembly) ABS/VSC/TRC Installed on all vehicles
      Steering angle sensor (Spiral cable with sensor sub-assembly) Steering Angle Sensor Installed on all vehicles
      Yaw rate and acceleration sensor Yaw Rate/Deceleration Sensor Installed on all vehicles
      Airbag sensor assembly SRS Airbag Installed on all vehicles
      Certification ECU (Smart key ECU assembly) Entry & Start/Wireless Tuner Installed on all vehicles
      Air conditioning amplifier assembly Air Conditioner Installed on all vehicles

      • Navigation ECU (Display and navigation module display)*1

      • Navigation ECU (Navigation computer sub-assembly)*2

      		 AVN1 Vehicles with Navigation system
      Driving support ECU assembly Cruise Control (ACC) Vehicles with dynamic radar cruise control system
      Parking assist ECU Parking Assist Monitor System Vehicles with navigation system
      Clearance warning ECU assembly Clearance Sonar Vehicles with LEXUS parking assist sensor system
      Seat belt control ECU Pre-crash Seat Belt Vehicles with pre-crash safety system
      Position control ECU and switch assembly Driver Seat Vehicles with seat position memory

      • Outer mirror control ECU assembly (Driver side)*3

      • Outer mirror control ECU assembly (Front passenger side)*4

      		 L-Mirror Vehicles with seat position memory

      • Outer mirror control ECU assembly (Front passenger side)*3

      • Outer mirror control ECU assembly (Driver side)*4

      		 R-Mirror Vehicles with seat position memory

      Tech Tips

      *1: w/ Navigation system (for DVD)

      *2: w/ Navigation system (for HDD)

      *3: for LHD

      *4: for RHD

  3. BUS CHECK (COMMUNICATION MALFUNCTION DTC)

    Tech Tips

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


    1. A003YS3

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

    2. A003ZHQ

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

    3. A003WM5

      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. A003YS3

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

    2. A003ZHQ

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

    3. A003XH2

      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. A003YUA

      "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, the CAN communication DTCs of each ECU can be displayed 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"
      U0110-159*1 Lost Communication with Driver Motor Control Module
      U0110-160*2 Lost Communication with Driver Motor Control Module
      U0110-656*1 Lost Communication with Driver Motor Control Module
      U0110-657*1 Lost Communication with Driver Motor 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 Lost Communication with Body Control Module
      U0151-763 Lost Communication with Airbag ECU
      U0164-594 Lost Communication with A/C ECU
      U0164-827 Lost Communication with A/C ECU
      U0424-537*3 Invalid Data Received from HVAC Control Module
      U1104-728*4 Lost Communication with Driving Support ECU
      U1107-436 Lost Communication with Power Management Module

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *1: Refer to Hybrid Control System Click here.

      • *2: Refer to Hybrid Control System Click here.

      • *3: Refer to Hybrid Control System Click here.

      • *4: Refer to Dynamic Radar Cruise Control System Click here.

    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
      U0293*5 HV ECU Communication

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *5: Refer to Entry and Start System Click here.

    3. Power Management Control ECU / Intelligent Tester Display "PM1 Gateway"

      DTC Code Detection Item
      U0104 Lost Communication with Driving Support ECU
      U1002 Lost Communication with Gateway Module (Power Management1)
      U1100 Lost Communication with Seat Belt Control ECU
      U1110 Lost Communication with Clearance Sonar Module
      U110B Lost Communication with Parking Assist Control Module "B"

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • "PM1 Gateway" stores DTCs when a communication error is detected in the V2 bus.

    4. Power Management Control ECU / Intelligent Tester Display "PM2 Gateway"

      DTC Code Detection Item
      U0100 Lost Communication with ECM / PCM
      U0129 Lost Communication with Brake System Control Module
      U0164 Lost Communication with A/C ECU
      U1002 Lost Communication with Gateway Module (Power Management2)

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • "PM2 Gateway" stores DTCs when a communication error is detected in the power management bus.

    5. Power Management Control ECU / Intelligent Tester Display "Cruise Control"

      DTC Code Detection Item
      U0122 Lost Communication with Vehicle Dynamic Control Module

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

    6. ECM / Intelligent Tester Display "Engine and ECT"

      DTC Code Detection Item
      U0293 Lost Communication with HV ECU

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

    7. Transmission Control ECU Assembly / Intelligent Tester Display "Transmission Control"

      DTC Code Detection Item
      U0146 Lost Communication with Body ECU

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

    8. Power Steering ECU Assembly / Intelligent Tester Display "EMPS"

      DTC Code Detection Item
      U0129 Lost Communication with Brake System Control Module
      U0293 Lost Communication with HV ECU

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

    9. Skid Control ECU (Brake booster with master cylinder assembly) / 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 Communication Error from HV ECU

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

    10. Steering Angle Sensor / Intelligent Tester Display "Steering Angle Sensor"

      Tech Tips

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

    11. Yaw Rate and Acceleration Sensor / Intelligent Tester Display "Yaw Rate / Deceleration Sensor"

      Tech Tips

      The yaw rate and acceleration sensor is connected to the CAN communication system, but the yaw rate and acceleration sensor does not store or output CAN communication DTCs.

    12. Airbag Sensor Assembly / Intelligent Tester Display "SRS Airbag"

      Tech Tips

      The airbag sensor assembly is connected to the CAN communication system, but the airbag sensor assembly does not store or output CAN communication DTCs.

    13. Main Body ECU (Multiplex network body ECU) / 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
      U0199 Lost Communication with "Door Control Module A"
      U0200 Lost Communication with "Door Control Module B"
      U0208 Lost Communication with "Seat Control Module A"
      U0293 Lost Communication with Hybrid Powertrain Control Module
      U0327 Software Incompatibility with Vehicle Security
      U1002 Lost Communication with Gateway Module (Main body)
      U1133 Lost Communication with PMN Module

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

    14. Certification ECU (Smart key ECU assembly) / Intelligent Tester Display "Entry & Start"

      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

      This ECU uses the CAN communication system for DTC communication.

    15. Air Conditioning Amplifier Assembly / Intelligent Tester Display "Air Conditioner"

      DTC Code Detection Item
      U0100 Lost Communication with ECM
      U0101 Lost Communication with TCM
      U0131 Lost Communication with Electric Power Steering ECU
      U0142 Lost Communication with Main Body ECU
      U0155 Lost Communication with Combination Meter
      U0293 Lost Communication with HV ECU

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

    16. Combination Meter Assembly / Intelligent Tester Display "Combination Meter"

      DTC Code Detection Item
      U0100 Lost Communication with ECM / PCM "A"
      U0129 Lost Communication with Skid Control ECU
      U0131 Lost Communication with Power Steering Control Module
      U0142 Lost Communication with Main Body ECU
      U0151 Lost Communication with Airbag ECU

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

    17. Navigation ECU (Display and navigation module display) (w/ Navigation system for DVD) / Intelligent Tester Display "Navigation System"

      DTC Code Detection Item
      U0073 Control Module Communication Bus Off
      U0155 Lost Communication with Combination Meter
      U0164 Lost Communication with A/C ECU
      U0293 Lost Communication with HV ECU
      U1110 Lost Communication with Clearance Warning ECU

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

    18. Navigation ECU (Navigation computer sub-assembly) (w/ Navigation system for HDD) / Intelligent Tester Display "Navigation System"

      DTC Code Detection Item
      U0073 Control Module Communication Bus Off
      U0155 Lost Communication with Combination Meter
      U0164 Lost Communication with A/C ECU
      U0293 Lost Communication with HV ECU
      U1110 Lost Communication with Clearance Warning ECU

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

    19. Seat Belt Control ECU / Intelligent Tester Display "Pre-Crash"

      DTC Code Detection Item
      U0122 Lost Communication with Vehicle Dynamics Control Module
      U0140 Lost Communication with Main Body ECU
      U0151 Lost Communication with Airbag ECU
      U1104 Lost Communication with Driving Support ECU

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

    20. Driving Support ECU Assembly / Intelligent Tester Display "Pre-Crash 2"

      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*6 Lost Communication with Cruise Control Front Distance Range Sensor
      U0293 Lost Communication with HV ECU
      U1100 Lost Communication with Seat Belt Control ECU
      U1104*7 Lost Communication with Driving Support ECU

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *6: Refer to Pre-Crash Safety System Click here.

      • *7: Refer to Pre-Crash Safety System Click here.

    21. Driving Support ECU Assembly / Intelligent Tester Display "Radar Cruise"

      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*8 Lost Communication with Cruise Control Front Distance Range Sensor
      U0293 Lost Communication with HV ECU
      U1104*9 Lost Communication with Driving Support ECU

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *8: Refer to Dynamic Radar Cruise Control System Click here.

      • *9: Refer to Dynamic Radar Cruise Control System Click here.

    22. Clearance Warning ECU Assembly / Intelligent Tester Display "Clearance Sonar"

      DTC Code Detection Item
      U0101*10 Lost Communication with TCM*8
      U0155 Lost Communication with Instrument Panel Cluster Control Module (Combination Meter)

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *10: Shift state signal can not received from hybrid vehicle control ECU

    23. Position Control ECU and Switch Assembly/ Intelligent Tester Display "Driver Seat"

      Tech Tips

      The position control ECU and switch assembly is connected to the CAN communication system, but the position control ECU and switch assembly does not store or output CAN communication DTCs.

    24. Outer Mirror Control ECU Assembly (Driver Side)/ Intelligent Tester Display "Mirror L" (for LHD), "Mirror R" (for RHD)

      DTC Code Detection Item
      U0142 Lost Communication with Body Control Module "B"

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

    25. Outer Mirror Control ECU Assembly (Front Passenger Side)/ Intelligent Tester Display "Mirror R" (for LHD), "Mirror L" (for RHD)

      DTC Code Detection Item
      U0142 Lost Communication with Body Control Module "B"

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

    26. Parking Assist ECU / Intelligent Tester Display "Parking Assist Monitor System"

      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
      U0140 Lost Communication with Body Control Module
      U1110 Lost Communication with Clearance Sonar Module

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

  6. DTC COMBINATION TABLE


    1. V1 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
      U0129 ○*1 X X X
      U0140 ○*1 X ○ X
      U0151 ○*1 X X X
      U1107 ○*1 X X X

      Power management control ECU

      (Electric Power Control)

      		 U0129 ○*1 X X X
      U0140 ○*1 X ○ X
      U0293 ○ X X X

      Power management control ECU

      (Cruise Control)

      		 U0122 ○*1 X X X
      ECM U0293 ○ ○*1 X X
      Transmission control ECU assembly U0146 X X ○ X
      Main body ECU U0100 X ○ ○*1 X
      U0101 ○ X ○*1 X
      U0151 X X ○*1 X
      U0155 X X ○*1 ○
      U0164 ○ X ○*1 X
      U0293 ○ X ○*1 X
      U0327 X X ○*1 X
      U1133 ○ X ○*1 X
      Combination meter assembly U0100 ○ ○ X ○*1
      U0129 X X X ○*1
      U0131 X 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 assembly U0129 X X X X
      U0293 ○ 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
      U0155 X X X ○
      U0164 ○ X X X
      U0293 ○ X X X
      U1110 ○ 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
      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
      U0293 X X X X

      Power management control ECU

      (Cruise Control)

      		 U0122 X X X X
      ECM U0293 X X X X
      Transmission control ECU assembly U0146 X X X X
      Main body ECU 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 assembly 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 assembly U0129 ○*1 ○ ○ ○
      U0293 ○*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
      U0155 X X X X
      U0164 X X X X
      U0293 X X X X
      U1110 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
      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
      U0293 X X X X

      Power management control ECU

      (Cruise Control)

      		 U0122 X X X X
      ECM U0293 X X X X
      Transmission control ECU assembly U0146 X X ○*1 X
      Main body ECU 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 assembly 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 assembly U0129 X X X X
      U0293 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
      U0155 X X X ○*1
      U0164 X X X ○*1
      U0293 X X X ○*1
      U1110 X X X ○*1

      Tech Tips


      • ○: Set

      • X: Not set or may be set according to the malfunctioning part when one line of a branch is open.

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

      • 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

      • Navigation ECU Communication Stop Mode Click here