EGR Temperature Sensor: Description and Operation

PURPOSE/OPERATION
The EGR temperature sensor (CA only) senses exhaust gas being recirculated into the engine. The sensor is used for diagnosis of the EGR system. Whenever the ignition is ON, the sensor signal is available. When the EGR valve is open, and exhaust is flowing into the engine, the sensor reads high temperature. When the EGR is closed, it reads low temperature. Because the ECU triggers the EGR through a solenoid, it is able to determine if the EGR is responding to it's control.