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Diagnosis System

WARNING: This page is about a different car, the 2007 Lexus SC 430. 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 the CAN VIM.

      Fig 1: Selecting BUS CHECK On OBD/MOBD MENU Screen
      G05294546Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Press "ENTER" on the intelligent tester via the CAN VIM.
      Fig 2: OBD/MOBD MENU Screen Display - ENTER
      G05294547Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. The screen displays the ECUs that are properly connected to the CAN communication system.

      HINT:

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

  2. DTC TABLE BY ECU 

    HINT:

    • In the CAN communication system, CAN communication system DTCs can be displayed by the ECU using the intelligent tester (with CAN VIM).
    • If CAN communication system DTCs are output, the trouble cannot be determined only by the DTCs. Perform troubleshooting according to "HOW TO PROCEED WITH TROUBLESHOOTING " .
      Fig 3: OBD/MOBD MENU Screen Display - ECUs Connected
      G05294548Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. ECM

      HINT:

      The ECM is connected to the CAN communication system.

      DTC CHART

      DTC No. Detection Item
      U0001 High Speed CAN Communication Bus

      HINT:

      The ECM is malfunctioning if U0001 is output alone.

      Replace the ECM.

    2. Skid control ECU

      HINT:

      DTC communication uses the SIL line.

      DTC CHART

      DTC No. Detection Item
      U0073/42 Control Module Communication Bus OFF
      U0100/65 Lost Communication with ECM / PCM
    3. GATEWAY ECU

      HINT:

      The gateway ECU is connected to the CAN communication system but CAN communication DTCs are not output.

  3. DTC COMBINATION TABLE 
    DTC COMBINATION CHART

    DTC Trouble Mode
    Output from Output DTC ECM COMMUNICATION STOP MODE GATEWAY ECU COMMUNICATION STOP MODE TRANSLATE ECU COMMUNICATION STOP MODE
    Skid control ECU assembly U0073/42 X X ◦
    U0100/65 x: During driving X x: During driving
    HINT:
    ◦: Output
    x: Outputs under the following condition
    X: Not output
    1. Perform troubleshooting according to the combination of DTCs output.

      HINT:

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