| 摘要 |
A coolant circuit circulates coolant between an internal combustion engine and a radiator of a vehicle and is provided with a thermostat. A control unit obtains radiator side released heat amount information, which indicates the amount of heat released from coolant through the radiator or information relevant to the amount of heat released from the coolant through the radiator. The control unit determines whether a thermostat open state abnormality exists by determining whether a predetermined thermostat abnormal time correlation exists between the radiator side released heat amount information and a vehicle speed of the vehicle in a warm-up incomplete temperature range of the coolant.
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