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Home › Lexus › 2007 › RX 400h AWD › Repair and Diagnosis › External Pages › Different car › Section 292 (Can Communication System) › Can Communication System › Diagnosis System

Diagnosis System

WARNING: This page is about a different car, the 2008 Toyota FJ Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
  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 TERMINALS OF ECU  ).
    • 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.
      SKID CONTROL ECU SPECIFICATION

      ECU/Sensor name Check method
      Skid control ECU Installed on all vehicles
      ECM Installed on all vehicles
      Yaw rate sensor Installed on all vehicles
      Steering angle sensor 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 the Techstream.
    • If CAN communication system DTCs are output, trouble cannot be determined solely from the DTCs. Perform troubleshooting according to HOW TO PROCEED WITH TROUBLESHOOTING  .
    1. SKID CONTROL ECU

      HINT:

      DTC communication uses the SIL Line.

      DTC DETECTION ITEM TABLE

      DTC No. Detection Item
      U0073/94 Control Module Communication Bus OFF
      U0100/65 Lost Communication with ECM/PCM
      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
    2. YAW RATE SENSOR

      HINT:

      • The yaw rate sensor is connected to the CAN communication system but CAN communication DTCs are not output.
      • If "YAW/DECELERATE" is not displayed on the "BUS CHECK" screen on the Techstream, proceed to YAW RATE SENSOR COMMUNICATION STOP MODE  .
    3. STEERING ANGLE SENSOR

      HINT:

      • The steering sensor is connected to the CAN communication system but CAN communication DTCs are not output.
      • If "STEERING_SENSOR" is not displayed on the "BUS CHECK" screen on the Techstream, proceed to STEERING ANGLE SENSOR COMMUNICATION STOP MODE  .
    4. ECM

      HINT:

      • The ECM is connected to the CAN communication system but CAN communication DTCs are not output.
      • If "ENGINE" is not displayed on the "BUS CHECK" screen on the Techstream, proceed to ECM COMMUNICATION STOP MODE  .
  4. DTC COMBINATION TABLE 
    DTC COMBINATION TABLE

    DTC Trouble Mode
    Output from Output DTC ECM Communication Stop Mode Skid Control ECU Communication Stop Mode Yaw Rate Sensor Communication Stop Mode Steering Angle Sensor Communication Stop Mode
    Skid Control ECU U0073/94 X X X X
    U0100/65 ◦ X X X
    U0123/62 X X ◦ X
    U0124/95 X X ◦ X
    U0126/63 X X X ◦
    HINT:
    • ◦: It is necessary to check for the trouble mode.
    • X: Not output
    1. Perform troubleshooting according to the combination of DTCs output.

      HINT:

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