EGR Temperature Sensor: Description and Operation

EGR Temperature Sensor Circuit:

Purpose
The EGR Temperature Sensor, located on the EGR valve, verifies EGR valve operation. This is done by monitoring the exhaust passage temperature down stream of the EGR valve.

Operation
To confirm that the EGR valve is functioning properly, the ECM expects to see an increase in temperature at the sensor whenever the EGR valve is operating. In the event of a malfunction the ECM will set a code and turn the Malfunction Indicator Light "ON". The resistance value of the sensor increases as temperature decreases.