Temperature control device for internal combustion engine

A temperature control device for an internal combustion engine, wherein the device is applied to a system that includes:

• an internal combustion engine, which has therein an engine passage, which is a passage for coolant;
• a cooling circuit, which is arranged outside the internal combustion engine and is coupled to the engine passage;
• an electric pump, which is configured to circulate the coolant;
• a water temperature sensor, which is arranged in the internal combustion engine;
• and
• an ambient temperature sensor, which is configured to detect an ambient temperature, which is a temperature of gas surrounding the internal combustion engine,
• the temperature control device comprising:
• a determining drive processor, which is configured to drive the electric pump when a difference between a water temperature detected by the water temperature sensor and an ambient temperature detected by the ambient temperature sensor is greater than or equal to a predetermined value while the electric pump is stopped;
• and
• an abnormality determining processor, which is configured to determine that at least one of the water temperature sensor and the ambient temperature sensor is abnormal on a condition that a decrease amount of a water temperature detected by the water temperature sensor that results from driving the electric pump by the determining drive processor is less than or equal to a predetermined amount, wherein
• the determining drive processor includes a stopping processor, which stops driving of the electric pump when a cumulative amount of the coolant discharged from the electric pump reaches a predetermined cumulative amount with driving of the electric pump by the determining drive processor, and
• the predetermined cumulative amount is set according to an inside volume of the engine passage between an inlet of the engine passage and the water temperature sensor.