An engine mounted to a vehicle includes at least one manipulation member used for control of output of the engine. An electronic control unit controls the manipulation member in accordance with the driving condition of the engine. When it is determined that there is an abnormality in the electronic control unit, the amount of air drawn into the engine is fixed to a predetermined value and the amount of manipulation of the manipulation member is restricted. When the rotational speed of the engine becomes higher than the predetermined speed, the electronic control unit determines that there is an abnormality relating to the manipulation of the manipulation member.

 
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