EGR Temperature Sensor: Description and Operation

Exhaust Gas Recirculation (EGR) Temperature Sensor:

PURPOSE
The Exhaust Gas Recirculation (EGR) Temperature Sensor detects temperature changes in the EGR passage way.

OPERATION
When the EGR valve opens, hot exhaust gases flow, and the temperature in the passageway changes. The EGR temperature sensor is a thermistor that modifies a voltage signal sent from the Engine Control Module (ECM). This modified signal then returns to the ECM as an input signal. As the temperature increases, EGR temperature sensor resistance decreases.