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

Engine Coolant Temperature Sensor:

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

Coolant Temperature Sensor:

CONSTRUCTION
The Coolant Temperature Sensor is a thermistor type sensor.



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.