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Home >> Toyota >> 2021 >> Avalon TRD >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> Electronically Controlled Brake System - Diagnostic Codes (P0571-U0074) & Symptom Tests (Except Hybrid) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model) >> DTC U0073: Control Module Communication Bus Off; DTC U0100: Lost Communication With ECM/PCM "A"; DTC U0123: Lost Communication With Yaw Rate Sensor Module; DTC U0126: Lost Communication With Steering Angle Sensor Module; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0151: Lost Communication With Restraints Control Module [04/2018 - 08/2021] >> Procedure
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DTC U0073: Control Module Communication Bus Off; DTC U0100: Lost Communication With ECM/PCM "A"; DTC U0123: Lost Communication With Yaw Rate Sensor Module; DTC U0126: Lost Communication With Steering Angle Sensor Module; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0151: Lost Communication With Restraints Control Module [04/2018 - 08/2021]: Procedure

  1. CHECK DTC OUTPUT (HEALTH CHECK) 
    1. Clear the DTCs.

      Chassis > ABS/VSC/TRAC/EPB > Clear DTCs 

    2. Turn the engine switch off.
    3. Turn the engine switch on (IG).
    4. Enter the following menus: System Select / Health Check.
    5. Check for DTCs.

      Result

      Result Proceed to
      DTCs for related systems are output together with DTC U0073, U0100, U0123, U0126, U0142 or U0151. A
      U0073, U0100, U0123, U0126, U0142 or U0151 is output B
      DTCs are not output C

    Result: 

    GO TO DIAGNOSTIC TROUBLE CODE CHART (RELATED SYSTEM) 

    Result: 

    INSPECT CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 -] 

    Result: 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 -]