EGR Temperature Sensor: Description and Operation

EGR Gas Temperature Sensor:

This sensor measures the temperature of the exhaust gases present at the EGR valve and sends this information to the ECU. The ECU compares this reading to its programmed nominal value to confirm proper EGR system operation. If the temperature is too high, the ECU senses that exhaust gases are not being recirculated and NOx emissions will be abnormal. A fault code 71 will be entered into ECU memory and the "CHECK ENGINE" light should illuminate. The EGR Gas Temperature Sensor inputs the ECU through terminal THG.