Coolant Temperature Sensor

A coolant temperature sensor is confined to the engine of a vehicle and measures the temperature of the vehicle¡¯s engine coolant. The sensor feeds this information back in the form of an electrical current to the engine control unit (ECU). The ECU then responds to a change in the temperature difference and readjusts the engine¡¯s fuel injection. A coolant sensor is similar to a thermistor, based on the working principle that a change in electrical resistance will be the direct product of a change in the temperature of a wire carrying current. With a coolant temperature sensor, the full sensor is located in a coolant passage that sits before a thermostat and is connected to the engine control and monitoring unit. The coolant temperature sensor is fastened to the intake manifold of an engine coolant and is often referred to as a negative temperature coefficient type of sensor. In terms of resistance capacity, this coolant sensor has 20,000 ohms at 248 degrees Fahrenheit. There is an i