Engine Coolant Temperature Sensor (ECTS)
The Engine Coolant Temperature Sensor (ECTS) is located in the cylinder block and cylinder head, and measures the temperature of the engine coolant. The thermistor of the cooling water temperature sensor has a negative temperature coefficient (NTC) characteristic in which the resistance decreases when the temperature rises and the resistance increases when the temperature rises. A coolant temperature sensor (ETCS) # 1 mounted on the cylinder head measures the coolant temperature from the engine, and a coolant temperature sensor (ETCS) # 2 mounted on the cylinder block measures the coolant temperature entering the engine. The cooling water temperature sensor (ETCS) # 1 and the cooling water temperature sensor (ETCS) # 2 deliver the cooling water temperature to the ECM/PCM and the ECM/PCM sends the signal to the Thermal Management Module valve (TMM). The TMM that receives the signal controls the flow of the coolant to adjust the coolant temperature.