| 摘要 |
PROBLEM TO BE SOLVED: To provide a failure-diagnosis device for a temperature sensor of an internal combustion engine which correctly makes failure-determination even when detected temperature of a cooling-water temperature-sensor on the radiator side is little changed in operation of the internal combustion engine. SOLUTION: When a stoppage time, i.e. an elapsed time from a point in time of the engine having come to a stop exceeds a prescribed time, failure of the cooling-water temperature sensor 6 is determined on the basis of detected temperatures of the sensor 6, a cooling-water temperature sensor 7 on the engine side, and an intake air temperature sensor 8. When the prescribed time has elapsed from the point in time of the engine having come to a stop, temperature around each sensor becomes almost the same as outside-air temperature. Accordingly, by comparing temperatures detected by sensors with each other, a correct determination can be made. COPYRIGHT: (C)2005,JPO&NCIPI
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