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DTC C1201/51: Engine Control System Malfunction: Procedure

  1. CHECK ENGINE CONTROL SYSTEM 
    1. Check if the engine control system DTC is output. Refer to DTC CHECK / CLEAR .

      Result

      Result Proceed to
      DTC not output A
      DTC output B

    B → See step   3 

    A → See step   2 

  2. CHECK FOR INTERMITTENT PROBLEMS (ENGINE CONTROL SYSTEM). Refer to  CHECK FOR INTERMITTENT PROBLEMS 
  3. INSPECT ENGINE CONTROL SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING