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Diagnosis System

  1. CAN BUS CHECK 
    1. Using the Techstream, select "CAN Bus Check" from the "System Select".
  2. CHECK FOR INSTALLED SYSTEMS (ECUS AND SENSORS) THAT ADOPT CAN COMMUNICATION 
    1. Systems (ECUs, sensors) that adopt CAN communication vary depending on the vehicle's optional settings. Check which systems (ECUs, sensors) are installed on the vehicle.

      HINT: 

      ECUs and sensors that are connected to the LIN communication system and the local CAN system are also displayed.

      ECU/Sensor name Check method
      ECM Installed on all vehicles
      Combination meter Installed on all vehicles
      Center airbag sensor Installed on all vehicles
      Power steering ECU Installed on all vehicles
      Main body ECU Installed on all vehicles
      Skid control ECU Installed on all vehicles
      Steering angle sensor Installed on all vehicles
      Yaw rate sensor Installed on all vehicles
      Air conditioning amplifier w/ Air conditioning system
      Network gateway ECU*1 for 4WD
      4WD control ECU*2 for 4WD

      *1: w/ Network gateway ECU

      *2: w/o Network gateway ECU

  3. DTC TABLE BY ECU 

    HINT: 

    • In the CAN communication system, CAN communication system DTCs can be displayed by the ECU using the Techstream.
    • If CAN communication system DTCs are output, trouble cannot be determined only by the DTCs. Perform troubleshooting according to HOW TO PROCEED WITH TROUBLESHOOTING .
    1. SKID CONTROL ECU

      HINT: 

      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
    2. POWER STEERING ECU

      HINT: 

      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
    3. AIR CONDITIONING AMPLIFIER (w/ Air conditioning system)

      HINT: 

      • DTC communication uses the CAN communication system.
      • The following DTC is output only for current malfunctions.
      DTC No. Detection Item
      B1499 Multiplex Communication Circuit
    4. 4WD CONTROL ECU (for 4WD)

      HINT: 

      DTC communication uses the CAN system.

      DTC No. Detection Item
      U0073 Control Module Communication Bus Off
      U0100 Lost Communication with ECM/PCM "A"
      U0126 Lost Communication with Steering Angle Sensor Module
      U0129 Lost Communication with Brake System Control Module
    5. NETWORK GATEWAY ECU (w/ Network gateway ECU)

      HINT: 

      DTC communication uses the CAN system.

      DTC No. Detection Item
      U0114 Lost Communication with 4WD Control ECU
      U1002 Lost Communication with Gateway Module
    6. ECM

      HINT: 

      The ECM is connected to the CAN communication system, but CAN communication DTCs are not output.

    7. CENTER AIRBAG SENSOR

      HINT: 

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

    8. STEERING ANGLE SENSOR

      HINT: 

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

    9. YAW RATE SENSOR

      HINT: 

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

    10. COMBINATION METER

      HINT: 

      The combination meter is connected to the CAN communication system, but CAN communication DTCs are not output.

    11. MAIN BODY ECU

      HINT: 

      The main body ECU is connected to the CAN communication system, but CAN communication DTCs are not output.

  4. DTC COMBINATION TABLE  
    1. CAN No. 1 Bus
      DTC Trouble Mode
      Output from Output DTC ECM Communication Stop Mode Skid Control ECU Communication Stop Mode Steering Angle Sensor Communication Stop Mode Yaw Rate Sensor Communication Stop Mode Combination Meter ECU Communication Stop Mode
      Skid Control ECU U0073 X ◦*1 X X X
      U0100 ◦ ◦*1 X X X
      U0123 X ◦*1 X ◦ X
      U0124 X ◦*1 X ◦ X
      U0126 X ◦*1 ◦ X X
      Power Steering ECU U0100 ◦ X X X X
      U0129 X ◦ X X X
      4WD Control ECU
      *2      		 U0073 - - - - -
      U0100 ◦ X X X X
      U0126 X X X ◦ X
      U0129 X ◦ X X X

      HINT: 

      • ◦: Set
      • X: Not set or may be set according to the malfunctioning part when one side of the CAN bus wire opens
      • -: Not output
      • *1: Does not output it during communication error
      • *2: w/o Network control ECU
      DTC Trouble Mode
      Output from Output DTC Air Conditioning Amplifier Communication Stop Mode Center Airbag Sensor Communication Stop Mode Power Steering ECU Communication Stop Mode Main Body ECU Communication Stop Mode Gateway ECU Communication Stop Mode
      *3      		 4WD Control ECU Communication Stop Mode
      *2
      Skid Control ECU U0073 X X X X X -
      U0100 X X X X X -
      U0123 X X X X X -
      U0124 X X X X X -
      U0126 X X X X X -
      Power Steering ECU U0100 X X ◦*1 X X -
      U0129 X X ◦*1 X X -
      4WD Control ECU
      *2      		 U0073 - - - - - ◦*1
      U0100 X X X X - ◦*1
      U0126 X X X X - ◦*1
      U0129 X X X X - ◦*1

      HINT: 

      *1: w/ Network gateway ECU

      *2: w/o Network gateway ECU

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