| 摘要 |
An apparatus for detecting a failure of a thermostat provided between an engine and a radiator is provided. The thermostat regulates circulation of cooling water between the engine and the radiator. The apparatus comprises a radiator water temperature sensor disposed on the radiator side relative to the thermostat and a controller. The controller performs a process for detecting a failure of the thermostat based on the output of the radiator water temperature sensor when the engine has reached a desired warm condition. In one example, it is determined whether the engine has reached the desired warm condition based on the output of the engine water temperature sensor that is provided in the engine side relative to the thermostat. In another example, it is determined whether the engine had reached the desired warm condition according to whether a vehicle-related process is activated. In yet another example, it is determined whether the engine has reached the desired warm condition based on an estimated value for the engine water temperature.
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