EGR Temperature Sensor: Description and Operation
The EGR sensor is a negative temperature coefficient (NTC) thermistor. NTC means that the resistance of the thermistor decreases as the sensed temperature increases. The ECM applies
5 volts to pin 1 of the sensor and monitors the voltage across the sensor pin to ground. The theoretical full voltage range is from
5 to
O volts representing maximum cold to maximum hot. Typically with the engine running at
2000 rpm the sensor voltage will drop
0.1 volt when the EGR valve is opened.
EGR Temperature Sensor:
Temperature Versus Resistance:
