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

GF07.04-P-6040BK Component Description For The Coolant Temperature Sensor







Location
The coolant temperature sensor is located at the front of the engine.

Task
The coolant temperature sensor detects the coolant temperature via an NTC resistor.







Function
The NTC resistor integrated in the coolant temperature sensor alters its electrical resistance in line with the coolant temperature. The NTC resistor is connected between ground and the ME control unit. When the coolant temperature sensor is unplugged, the voltage at the ME control is around 5 V.

NTC means "Negative Temperature Coefficient", which mean that the electrical resistance drops as the temperature increases (thermistor).







The connection assignment (polarity) of connection pin 1 and 2 is random.