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Diagnosis System

WARNING: This page is about a different car, the 2008 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.
  1. BUS CHECK 
    1. Select "BUS CHECK" from the "OBD/MOBD MENU" screen.

      HINT:

      The ECUs and sensors that are properly connected to the CAN communication system can be displayed using the intelligent tester via CAN VIM.

      Fig 1: Identifying OBD/MOBD MENU Display - Select BUS CHECK
      G04982229Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Press "ENTER" on the intelligent tester.
      Fig 2: Identifying OBD/MOBD MENU Display - Press ENTER
      G04982230Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. The screen displays the ECUs and sensors that are properly connected to the CAN communication system.

      HINT:

      There is a communication stop in the system of any properly connected ECUs or sensors that are not displayed.

  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.
      Fig 3: Identifying OBD/MOBD MENU Display - Press EXIT
      G04982231Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      ECU/SENSOR CHECKING METHOD REFERENCE

      ECU/Sensor name Check method
      Skid control ECU Installed on all vehicles
      Steering angle sensor Installed on all vehicles
      Yaw rate sensor Installed on all vehicles
      ECM Installed on all vehicles
      Distance control ECU Dynamic laser cruise control
      Gateway ECU Installed on all vehicles
  3. DTC COMBINATION TABLE 
    NOTE: Complete CHECK CAN BUS LINE  , to confirm there is no disconnection, short circuit, short to +B, or short to ground in the CAN main bus wires, and then perform troubleshooting according to the DTC combination table.
    1. Confirm the mode according to the combination of output DTCs.
      DTC COMBINATION TABLE

      DTC Trouble Mode
      Output from Output DTC SKID CONTROL ECU COMMUNICATION STOP MODE YAW RATE SENSOR COMMUNICATION STOP MODE STEERING ANGLE SENSOR COMMUNICATION STOP MODE
      Skid Control ECU U0073 - - -
      U0100 - - -
      U0123 - ◦ -
      U0124 - ◦ -
      U0126 - - ◦
      ECM U0100 - - -
      U0122 ◦*1 - -
      U0123 - ◦*1 -
      U0126 - - ◦*1
      U1101 - - -
      HINT:
      *1 : with dynamic laser cruise control system
      DTC COMBINATION TABLE

      DTC Trouble Mode
      Output from Output DTC ECM COMMUNICATION STOP MODE GATEWAY ECU COMMUNICATION STOP MODE DISTANCE CONTROL ECU COMMUNICATION STOP MODE
      Skid Control ECU U0073 - - -
      U0100 ◦ - -
      U0123 - - -
      U0124 - - -
      U0126 - - -
      ECM U0100 - - -
      U0122 - - -
      U0123 - - -
      U0126 - - -
      U1101 - - -
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