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Diagnosis System

  1. BUS CHECK 

    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.

    1. Select "BUS CHECK" from the "OBD / MOBD MENU" screen.
      Fig 1: Identifying OBD/MOBD Menu
      G04477350Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Press "ENTER" on the intelligent tester via the CAN VIM.
      Fig 2: Intelligent Tester Screen
      G04477351Courtesy 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 (see HOW TO PROCEED WITH TROUBLESHOOTING ).

  2. CHECK FOR INSTALLED SYSTEMS (ECU & SENSOR) THAT USE CAN COMMUNICATION 
    1. The systems (ECU, sensor) that use CAN communication vary depending on the vehicle's optional settings. Check which systems (ECU, sensor) are installed on the vehicle.
      Fig 3: Bus Check Screen
      G04477352Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      ECU / SENSOR NAME - INSTALLED TO

      ECU / Sensor name Installed to
      Hybrid Vehicle Control ECU All vehicles
      Battery ECU All vehicles
      ECM All vehicles
      Skid Control ECU All vehicles
      Power Steering ECU All vehicles
      Gateway ECU All vehicles Steering Angle Sensor Vehicle with enhanced VSC (VSC warning light is installed in combination meter)
      Yaw Rate Sensor Vehicle with enhanced VSC (VSC warning light is installed in combination meter)

      HINT:

      If enhanced VSC is not installed, neither the yaw rate sensor nor the steering angle sensor is used.

  3. DTC TABLE BY ECU 

    HINT:

    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. HYBRID VEHICLE CONTROL ECU

      HINT:

      DTC communication uses the CAN communication system.

      DTC INFORMATION CODE AND DETECTION ITEM (HYBRID VEHICLE CONTROL ECU)

      DTC No. Information Code Detection Item
      U0100 211, 212, 530 Lost Communication With ECM / PCM "A"
      U0111 208, 531 Lost Communication With Battery Energy Control Module "A"
      U0129 220, 222, 528, 529 Lost Communication With Brake System Control Module
      U0131 433, 434 Lost Communication With Power Steering Control Module
      U0146 435 Lost Communication With Gateway "A"
      P3108 594 Lost Communication With A/C System Control Module
    2. BATTERY ECU

      HINT:

      DTC communication uses the CAN communication system.

      DTC DETECTION ITEM (BATTERY ECU)

      DTC No. Detection Item
      U0100 Lost Communication With ECM / PCM "A"
      U0293 Lost Communication With Hybrid Vehicle Control System
    3. ECM

      HINT:

      DTC communication uses the CAN communication system.

      DTC DETECTION ITEM (ECM)

      DTC No. Detection Item
      U0293 Lost Communication With Hybrid Vehicle Control System
    4. SKID CONTROL ECU

      HINT:

      DTC communication uses the SIL line.

      DTC INFORMATION CODE AND DETECTION ITEM (SKID CONTROL ECU)

      DTC No. Information Code Detection Item
      U0293 152, 153, 154 Lost Communication With Hybrid Vehicle Control System
      U0073 360 Control Module Communication Bus Off
      U0123 - Lost Communication With Yaw Rate Sensor Module
      U0124 - Lost Communication With Lateral Acceleration Sensor Module
      U0126 - Lost Communication With Steering Angle Sensor Module

      w/ Enhanced VSC

    5. GATEWAY ECU

      HINT:

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

    6. POWER STEERING ECU

      HINT:

      DTC communication uses the SIL line.

      DTC DETECTION ITEM (POWER STEERING ECU)

      DTC No. Detection Item
      U0073 Control Module Communication Bus Off
      U0121 Lost Communication With Anti-Lock Brake System (ABS) Control Module
  4. DTC COMBINATION TABLE 
    1. Perform troubleshooting according to the combination of DTCs output.
      DTC COMBINATION

      DTC Detected Communication Stop Mode
      Output from Output DTC HYBRID VEHICLE CONTROL ECU COMMUNICATION STOP MODE ECM COMMUNICATION STOP MODE BATTER Y ECU COMMUNICATION STOP MODE SKID CONTROL ECU COMMUNICATION STOP MODE STEERING ANGLE SENSOR COMMUNICATION STOP MODE YAW RATE SENSOR COMMUNICATION STOP MODE POWER STEERING ECU COMMUNICATION STOP MODE GATE WAY ECU COMMUNICATION STOP MODE
      Hybrid Vehicle Control ECU U0100 - O X X X X X X
      U0111 - X O X X X X X
      U0129 - X X O X X X X
      U0146 - X X X X X X O
      P3108-594 - X X X X X X O
      ECM U0293 O - X X X X X X
      Battery ECU U0100 X O - X X X X X
      U0293 O X - X X X X X
      Skid Control ECU U0123 X X X - X O X X
      U0124 X X X - X O X X
      U0126 X X X - O X X X
      U0293 O X X - X x X X
      Power Steering ECU U0121 X X X O X X - X

      HINT:

      O: Outputs

      x: Not output

      -: Undetectable

      NOTE:
      • If U0146 or P3108-594 is output, check the "MULTIPLEX COMMUNICATION SYSTEM" (see HOW TO PROCEED WITH TROUBLESHOOTING ) before proceeding to "GATEWAY ECU COMMUNICATION STOP MODE".
      • If U0100-211 or U0111-208 is output separately by the hybrid control ECU, refer to "HYBRID CONTROL SYSTEM" (See DIAGNOSTIC TROUBLE CODE CHART ).

      HINT:

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