| 摘要 |
<p>There are occasions when an intermittent abnormality occurs in a water temperature sensor (16) that is of a type that does not cause a sudden change in a detection value of the water temperature sensor (16). The movement of the detection value of the water temperature sensor (16) when this type of abnormality occurs may be, for example, a movement in which the detection value of the water temperature sensor (16) becomes lower even though warm up has been proceeding after engine start up has begun. When this type of movement of the detection value occurs, if the detection value of the water temperature sensor (16) reduces, after engine start up has begun, to a value lower than that when start up began, it is immediately determined based on this fact that an abnormality of the water temperature sensor (16) is occurring.
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