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Diagnosis System

  1. BUS CHECK 
    1. Select "CAN Bus Check" from the "System Select" screen on the Techstream.

    HINT:

    • If any properly connected ECUs or sensors are not displayed, there is a communication stop in the system (See PROBLEM SYMPTOMS TABLE  ).
    • Display the communication BUS check screen for approximately 1 minute and check for ECUs and sensors that are not indicated on the screen.
  2. CHECK INSTALLED SYSTEMS (ECUS AND SENSORS) THAT ADOPT CAN COMMUNICATION 
    1. Systems (ECUs and sensors) that adopt CAN communication vary depending on the vehicle's optional settings. Check which systems (ECUs and sensors) are installed on the vehicle.
      ECU/SENSORS CHECKING METHOD

      ECU/Sensor name Check method
      Brake Actuator (skid control ECU) Vehicle with ABS
      ABS and traction actuator (skid control ECU) Vehicle with VSC
      Steering sensor Vehicle with VSC
      Yaw rate sensor Vehicle with VSC
      ECM Installed on all vehicles
      Center airbag sensor assembly Installed on all vehicles
      Air conditioning amplifier Installed on all vehicles
      Combination meter ECU Installed on all vehicles
      Main body ECU Installed on all vehicles
      Power steering ECU Installed on all vehicles
  3. DTC TABLE BY ECU 

    HINT:

    • In the CAN communication system, CAN communication system DTCs output by the ECU can be displayed by using a Techstream.
    • 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 (SKID CONTROL ECU) For vehicles with ABS only.

      HINT:

      DTC communication uses the CAN communication system.

      DTC DETECTION ITEM REFERENCE

      DTC No. Detection Item
      U0073/94 Control Module Communication Bus OFF
    2. ABS AND TRACTION ACTUATOR (SKID CONTROL ECU) For vehicles with VSC only.

      HINT:

      DTC communication uses the CAN communication system.

      DTC DETECTION ITEM REFERENCE

      DTC No. Detection Item
      U0073/94 Control Module Communication Bus OFF
      U0100/65 Lost Communication with ECM/PCM "A"
      U0123/62 Lost Communication with Yaw Rate Sensor Module
      U0124/95 Lost Communication with Lateral Acceleration Sensor Module
      U0126/63 Lost Communication with Steering Angle Sensor Module
    3. POWER STEERING ECU

      HINT:

      DTC communication uses the CAN communication system.

      DTC DETECTION ITEM REFERENCE

      DTC No. Detection Item
      U0100 Lost Communication with ECM/PCM "A"
      U0129 Lost Communication with Skid Control ECU
    4. COMBINATION METER ECU

      HINT:

      DTC communication uses the CAN communication system.

      DTC DETECTION ITEM REFERENCE

      DTC No. Detection Item
      U0100 Lost Communication with ECM/PCM "A"
      U0129 Lost Communication with Skid Control ECU
    5. AIR CONDITIONING AMPLIFIER

      HINT:

      • DTC communication uses the CAN communication system.
      • This DTC is output when the CAN communication system is malfunctioning and is not stored as a past DTC.
        DTC DETECTION ITEM REFERENCE

        DTC No. Detection Item
        B1499 Communication Malfunction (Engine and Meter ECU)
    6. ECM
      • The ECM is connected to the CAN communication system but CAN communication DTCs are not output.
      • If "Engine" is not displayed on the "CAN Bus Check" screen on the Techstream, proceed to "ECM COMMUNICATION STOP MODE "
    7. CENTER AIRBAG SENSOR ASSEMBLY

      HINT:

      • The center airbag sensor assembly is connected to the CAN communication system but CAN communication DTCs are not output.
      • If "SRS Airbag" is not displayed on the "CAN Bus Check" screen on the Techstream, proceed to "CENTER AIRBAG SENSOR COMMUNICATION STOP MODE ".
    8. MAIN BODY ECU

      HINT:

      • The main body ECU is connected to the CAN communication system but CAN communication DTCs are not output.
      • If "Main Body" is not displayed on the "CAN Bus Check" screen on the Techstream, proceed to "MAIN BODY ECU COMMUNICATION STOP MODE ".
  4. DTC COMBINATION TABLE 
    DTC COMBINATION TABLE

    DTC Trouble Mode
    Output from Output DTC Brake Actuator (Skid Control ECU) Communication Stop Mode ABS and Traction Actuator (Skid Control ECU) Communication Stop Mode Power Steering ECU Communication Stop Mode Steering Angle Sensor Communication Stop Mode Yaw Rate Sensor Communication Stop Mode
    Brake Actuator (Skid Control ECU)*2 U0073/94*2 ◦(*1) X X X X
    ABS and Traction Actuator (Skid Control ECU)*3 U0073/94*3 X ◦(*1) X X X
    U0100/65*3 X ◦(*1) X X X
    U0123/62*3 X ◦(*1) X X ◦
    U0124/95*3 X ◦(*1) X X ◦
    U0126/63*3 X ◦(*1) X ◦ X
    Power Steering ECU U0100 X X ◦(*1) X X
    U0129 ◦ ◦ ◦(*1) X X
    Combination Meter ECU U0100 X X X X X
    U0129 ◦ ◦ X X X
    HINT:
    • ◦: Outputs under conditions shown above.
    • X: Not output, but may be output when one side of the CAN bus line opens.
    • *1: Each ECU detects the above DTC(s) in succession when CAN communication system fails. However, these DTCs may not be output when the CAN communication system malfunctions.
    • *2: For vehicles with ABS only.
    • *3: For vehicles with VSC only.
    DTC COMBINATION TABLE

    DTC Trouble Mode
    Output from Output DTC Center Airbag Sensor Communication Stop Mode ECM Communication Stop Mode Air Conditioning Amplifier Communication Stop Mode Combination Meter ECU Communication Stop Mode Main Body ECU Communication Stop Mode
    Brake Actuator (Skid Control ECU)*2 U0073/94*2 X X X X X
    ABS and Traction Actuator (Skid Control ECU)*3 U0073/94*3 X X X X X
    U0100/65*3 X ◦ X X X
    U0123/62*3 X X X X X
    U0124/95*3 X X X X X
    U0126/63*3 X X X X X
    Power Steering ECU U0100 X ◦ X X X
    U0129 X X X X X
    Combination Meter ECU U0100 X ◦ X ◦(*1) X
    U0129 X X X ◦(*1) X
    HINT:
    • ◦: Outputs under conditions shown above.
    • X: Not output, but may be output when one side of the CAN bus line opens.
    • *1: Each ECU detects the above DTC(s) in succession when CAN communication system fails. However, these DTCs may not be output when the CAN communication system malfunctions.
    • *2: For vehicles with ABS only.
    • *3: For vehicles with VSC only.
    1. Perform troubleshooting according to the combination of DTCs output.

      HINT:

      *1: For vehicles with ABS only.

      *2: For vehicles with VSC only.

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