FAILURE DIAGNOSIS CONTROL DEVICE OF OIL TEMPERATURE SENSOR

PROBLEM TO BE SOLVED: To perform a determination of a failure diagnosis, without requiring a travel condition, by making the travel condition of limiting the performing timing for determining the possibility of performing the diagnosis unimportant, in a failure diagnosis control device of an oil temperature sensor.SOLUTION: A control means (12) determines failure of the oil temperature sensor (10), by storing the oil temperature detected by the oil temperature sensor (10) as the stopping oil temperature when stopping operation of an internal combustion engine (3), storing the water temperature detected by a water temperature sensor (5) as the stopping water temperature, storing the oil temperature detected by the oil temperature sensor (10) as the starting oil temperature when starting the internal combustion engine (3), storing the water temperature detected by the water temperature sensor (5) as the starting water temperature, calculating a difference between the stored stopping oil temperature and the starting oil temperature, and comparing this difference with a determining value determined under a predetermined condition based on the stored any water temperature.