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Home >> Scion >> 2013 >> tC Automatic Trans >> Repair and Diagnosis (Single Page) >> Brakes >> Anti-Lock Brakes >> Vehicle Stability Control System (Diagnostic Codes & Symptom Tests) >> Vehicle Stability Control System >> DTC U0073: Control Module Communication Bus OFF; DTC U0100: Lost Communication with ECM / PCM; DTC U0123: Lost Communication with Yaw Rate Sensor Module; DTC U0124: Lost Communication with Lateral Acceleration Sensor Module; DTC U0126: Lost Communication with Steering Angle Sensor Module >> Procedure
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DTC U0073: Control Module Communication Bus OFF; DTC U0100: Lost Communication with ECM / PCM; DTC U0123: Lost Communication with Yaw Rate Sensor Module; DTC U0124: Lost Communication with Lateral Acceleration Sensor Module; DTC U0126: Lost Communication with Steering Angle Sensor Module: Procedure

  1. RECONFIRM DTC 
    1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
    2. Turn the ignition switch off.
    3. Start the engine.
    4. Drive the vehicle at a speed of 15 km/h (9 mph) or more and turn the steering wheel to the right and left.
    5. Check for DTCs. Refer to DTC CHECK / CLEAR .

      HINT: 

      If a CAN communication system DTC and the relevant sensor DTCs are output simultaneously, troubleshoot the relevant sensor DTCs (for ABS and VSC) after the CAN communication system returns to normal.

      RESULT

      Result Proceed to
      DTC (relating to CAN communication system) is output A
      DTC (relating to ABS and/or VSC system) is output B
      DTC is not output C

    B → See step   4 

    C → See step   3 

    A → See step   2 

  2. GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 
  3. CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION). Refer to  CHECK FOR INTERMITTENT PROBLEMS 
  4. REPAIR CIRCUIT INDICATED BY OUTPUT DTC. Refer to  DIAGNOSTIC TROUBLE CODE CHART