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Home >> Scion >> 2012 >> tC Automatic Trans >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Air Conditioning System (Diagnostic Codes & Circuit Tests) >> Air Conditioning System >> DTC U0100: Lost Communication with ECM; DTC U0142: Lost Communication with Main Body ECU; DTC U0155: Lost Communication with Combination Meter >> Procedure

DTC U0100: Lost Communication with ECM; DTC U0142: Lost Communication with Main Body ECU; DTC U0155: Lost Communication with Combination Meter: Procedure

  1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM) 
    1. Use the Techstream to check if the CAN communication system is functioning properly. Refer to DIAGNOSIS SYSTEM .

      OK

      CAN DTC is not output.

    NG → See step   2 

    OK → See step   3 

  2. GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 
  3. USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING