Coolant Temperature Sensor/Switch (For Computer): Description and Operation

LOCATION
The coolant temperature sensor is located in the thermostat housing.

Coolant Temperature Sensor:

CONSTRUCTION
The Coolant Temperature Sensor is a thermistor type sensor.

Engine Coolant Temperature Sensor Circuit:

OPERATION
As engine temperature increases, sensor resistance decreases. The ECU monitors engine temperature by the sensor output voltage and provides optimum fuel enrichment when the engine is cold.