CAN COMMUNICATION SYSTEM(w/o Toyota Safety Sense) DIAGNOSIS SYSTEM


  1. BUS CHECK (COMMUNICATION MALFUNCTION ECU)

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


    1. A01VE8E

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

    2. A01VIEX

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

    3. A01VHF3

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

    4. A01VH1N

      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. A01VIEX

      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.

      • A01VGAV

        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. A01VGKR

      "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
      Air conditioning amplifier assembly Air Conditioning Amplifier w/ Air Conditioning System or PTC Heater
      Center airbag sensor assembly Airbag All vehicles
      Combination meter assembly Combination Meter All vehicles
      Radio receiver assembly Display and Navigation (AVN1) for Display Audio Type
      ECM ECM (Engine) All vehicles
      TCM ECT w/ Multi-mode Manual Transaxle
      Certification ECU (smart key ECU assembly) Entry & Start / Wireless Tuner w/ Entry and Start System
      Main body ECU (multiplex network body ECU) Main Body All vehicles
      Power management control ECU Power Management w/o Stop and Start System
      Engine stop and start ECU Power Management2 w/ Stop and Start System
      Power steering ECU assembly Power Steering (EPS) All vehicles
      Skid control ECU (brake actuator assembly) Skid Control (ABS/VSC/TRAC) All vehicles
      Steering angle sensor (spiral cable sub-assembly) Spiral cable (Steering Angle Sensor) w/ VSC
      Driving support ECU Driving Support (Cruise Control-ACC) for 1ND-TV with Cruise Control System

  4. DTC TABLE BY ECU

    Tech Tips


    • In the CAN communication system, CAN communication system DTCs stored by the ECU can be output from the ECU 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. ECM

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC No. Detection Item
      U0101*3 Lost Communication with TCM
      U0129*1, *2, *3 Lost Communication with Brake System Control Module
      U1103*1 Lost Communication with Stop and Start Control Module

      • *1: for 1NR-FE

      • *2: for 1KR-FE

      • *3: for 1ND-TV

    2. MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC No. Detection Item
      U0100 Lost Communication with ECM/PCM "A"
      U0101 Lost Communication with TCM
      U0120 Lost Communication with PMN Module
      U0151 Lost Communication with Restraints Control Module
      U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module
      U0164 Lost Communication with HVAC Control Module
      U0327 Software Incompatibility with Vehicle Security Control Module

    3. SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) (w/ VSC)

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC No. Detection Item
      U0073 Control Module Communication Bus Off
      U0100 Lost Communication with ECM/PCM "A"
      U0123 Lost Communication with Yaw Rate Sensor Module
      U0124 Lost Communication with Lateral Acceleration Sensor Module
      U0126 Lost Communication with Steering Angle Sensor Module
      U0142 Lost Communication with Body Control Module "B"

    4. SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) (w/o VSC)

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC No. Detection Item
      U0073 Control Module Communication Bus Off
      U0142 Lost Communication with Body Control Module "B"

    5. POWER STEERING ECU ASSEMBLY

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC No. Detection Item
      U0100 Lost Communication with ECM/PCM "A"
      U0129 Lost Communication with Brake System Control Module

    6. COMBINATION METER ASSEMBLY

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC No. 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

    7. RADIO RECEIVER ASSEMBLY (for Display Audio Type)

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC No. Detection Item
      U0073 Control Module Communication Bus Off
      U0100 Lost Communication with ECM/PCM "A"
      U0129 Lost Communication with Brake System Control Module
      U0140 Lost Communication with Main Body ECU
      U0155 Lost Communication with Combination Meter

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

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC No. Detection Item
      U0100 Lost Communication with ECM/PCM "A"
      U0140 Lost Communication with Body Control Module
      U0142 Lost Communication with Body Control Module "B"
      U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module
      U1103 Lost Communication with Stop and Start Control Module

    9. AIR CONDITIONING AMPLIFIER ASSEMBLY (w/ Air Conditioning System or PTC Heater)

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC No. Detection Item
      U0100 Lost Communication with ECM/PCM "A"
      U0131 Lost Communication with Power Steering Control Module
      U0142 Lost Communication with Body Control Module "B"
      U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module

    10. ENGINE STOP AND START ECU (w/ Stop and Start System)

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC No. Detection Item
      U0100 Lost Communication with ECM/PCM "A"
      U0121 Lost Communication with Anti-Lock Brake System (ABS) Control Module
      U0131 Lost Communication with Power Steering Control Module
      U0140 Lost Communication with J/B ECU
      U0151 Lost Communication with SRS Airbag ECU
      U0155 Lost Communication with Instrument Panel Cluster Control Module (Combination Meter)
      U0164 Lost Communication with HVAC Control Module
      U111A Lost Communication with ECM/PCM "A" (Powertrain Bus)

    11. TCM (w/ Multi-mode Manual Transaxle System)

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC No. Detection Item
      U0100 High Speed CAN Communication Bus

    12. DRIVING SUPPORT ECU (for 1ND-TV with Cruise Control System)

      Tech Tips

      DTC communication uses the CAN communication system.

      DTC No. Detection Item
      U0100 Lost Communication with ECM/PCM "A"
      U0129 Lost Communication with Brake System Control Module
      U1104 Lost Communication with Driving Support ECU

    13. POWER MANAGEMENT CONTROL ECU (for Rear Fog Light without Stop and Start System)

      Tech Tips

      The power management control ECU is connected to the CAN communication system but CAN communication DTCs are not stored.

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

      Tech Tips

      The steering angle sensor (spiral cable sub-assembly) is connected to the CAN communication system but CAN communication DTCs are not stored.

    15. 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.

  5. DTC COMBINATION TABLE

    Tech Tips


    • ○: Stored.

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

    • -: Not stored.

    • *1: During a communication stop, cannot be stored.

    Output from Output DTC Detected Communication Stop Mode
    V Bus
    ECM Communication Stop Mode Center Airbag Sensor Communication Stop Mode ABS and Traction Actuator (Skid Control ECU) Communication Stop Mode Brake Actuator (Skid Control ECU) Communication Stop Mode
    ECM U0129 ○*1 - ○ ○
    U1103 ○*1 - - -
    Skid control ECU (brake actuator assembly) (w/ VSC) U0073 X X ○*1 X
    U0100 ○ X ○*1 X
    U0123 X ○ ○*1 X
    U0124 X ○ ○*1 X
    U0126 X X ○*1 X
    U0142 X X ○*1 X
    Skid control ECU (brake actuator assembly) (w/o VSC) U0073 X X X ○*1
    U0142 X X X ○*1
    Air conditioning amplifier assembly U0100 ○ - - -
    U0131 - - - -
    U0142 - - - -
    U0155 - - - -
    Radio receiver assembly U0073 X X X X
    U0100 ○ - - -
    U0129 X X ○ ○
    U0140 - - - -
    U0155 - - - -
    Main body ECU (multiplex network body ECU) U0100 ○ - - -
    U0101 ○ - - -
    U0120 - - - -
    U0151 - ○ - -
    U0155 - - - -
    U0164 - - - -
    U0327 - - - -
    Power steering ECU assembly U0100 ○ - - -
    U0129 - - ○ ○
    Certification ECU (smart key ECU assembly) U0100 ○ - - -
    U0140 - - - -
    U0142 - - - -
    U0155 - - - -
    U1103 - - - -
    Engine stop and start ECU U0100 ○ - - -
    U0121 - - ○ ○
    U0131 X X X X
    U0140 - - - -
    U0151 - ○ - -
    U0155 - - - -
    U0164 - - - -
    Combination meter assembly U0100 ○ - - -
    U0129 - - ○ ○
    U0131 - - - -
    U0151 - ○ - -
    Driving support ECU U0100 ○ - - -
    U0129 - - ○ ○
    U1104 - - - -

    Tech Tips


    • ○: Stored.

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

    • -: Not stored.

    • *1: During a communication stop, cannot be stored.

    Output from Output DTC Detected Communication Stop Mode
    V Bus
    Air Conditioning Amplifier Communication Stop Mode Audio Receiver Assembly Communication Stop Mode Main Body ECU Communication Stop Mode Power Steering ECU Communication Stop Mode
    ECM U0129 - - - -
    U1103 - - - -
    Skid control ECU (brake actuator assembly) (w/ VSC) U0073 X X X X
    U0100 X X X X
    U0123 X X X X
    U0124 X X X X
    U0126 X X X X
    U0142 X X ○ X
    Skid control ECU (brake actuator assembly) (w/o VSC) U0073 X X X X
    U0142 X X ○ X
    Air conditioning amplifier assembly U0100 ○*1 - - -
    U0131 ○*1 - - ○
    U0142 ○*1 - ○ -
    U0155 ○*1 - - -
    Radio receiver assembly U0073 X ○*1 X X
    U0100 - ○*1 - -
    U0129 X ○*1 X X
    U0140 - ○*1 ○ -
    U0155 - ○*1 - -
    Main body ECU (multiplex network body ECU) U0100 - - ○*1 -
    U0101 - - ○*1 -
    U0120 - - ○*1 -
    U0151 - - ○*1 -
    U0155 - - ○*1 -
    U0164 ○ - ○*1 -
    U0327 - - ○*1 -
    Power steering ECU assembly U0100 - - - ○*1
    U0129 - - - ○*1
    Certification ECU (smart key ECU assembly) U0100 - - - -
    U0140 - - ○ -
    U0142 - - ○ -
    U0155 - - - -
    U1103 - - - -
    Engine stop and start ECU U0100 - - - -
    U0121 - - - -
    U0131 X X X ○
    U0140 - - ○ -
    U0151 - - - -
    U0155 - - - -
    U0164 ○ - - -
    Combination meter assembly U0100 - - - -
    U0129 - - - -
    U0131 - - - ○
    U0151 - - - -
    Driving Support ECU U0100 - - - -
    U0129 - - - -
    U1104 - - - -

    Tech Tips


    • ○: Stored.

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

    • -: Not stored.

    • *1: During a communication stop, cannot be stored.

    Output from Output DTC Detected Communication Stop Mode
    V Bus
    Certification ECU Communication Stop Mode Engine Stop and Start ECU Communication Stop Mode Steering Angle Sensor Communication Stop Mode Combination Meter ECU Communication Stop Mode Driving Support ECU Communication Stop Mode
    ECM U0129 - - - - -
    U1103 - ○ - - -
    Skid control ECU (brake actuator assembly) (w/ VSC) U0073 X X X X -
    U0100 X X X X -
    U0123 X X X X -
    U0124 X X X X -
    U0126 X X ○ X -
    U0142 X X X X -
    Skid control ECU (brake actuator assembly) (w/o VSC) U0073 X X X X -
    U0142 X X X X -
    Air conditioning amplifier assembly U0100 - - - - -
    U0131 - - - - -
    U0142 - - - - -
    U0155 - - - ○ -
    Radio receiver assembly U0073 X X X X -
    U0100 - - - - -
    U0129 X X X X -
    U0140 - - - - -
    U0155 - - - ○ -
    Main body ECU (multiplex network body ECU) U0100 - - - - -
    U0101 - - - - -
    U0120 ○ - - - -
    U0151 - - - - -
    U0155 - - - ○ -
    U0164 - - - - -
    U0327 ○ - - - -
    Power steering ECU assembly U0100 - - - - -
    U0129 - - - - -
    Certification ECU (smart key ECU assembly) U0100 ○*1 - - - -
    U0140 ○*1 - - - -
    U0142 ○*1 - - - -
    U0155 ○*1 - - ○ -
    U1103 ○*1 ○ - - -
    Engine stop and start ECU U0100 - ○*1 - - -
    U0121 - ○*1 - - -
    U0131 X ○*1 X X -
    U0140 - ○*1 - - -
    U0151 - ○*1 - - -
    U0155 - ○*1 - ○ -
    U0164 - ○*1 - - -
    Combination meter assembly U0100 - - - ○*1 -
    U0129 - - - ○*1 -
    U0131 - - - ○*1 -
    U0151 - - - ○*1 -
    Driving support ECU U0100 - - - - -
    U0129 - - - - -
    U1104 - - - - ○

    Tech Tips


    • ○: Stored.

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

    • -: Not stored.

    • *1: During a communication stop, cannot be stored.