Exhaust Gas Recirculation Temperature (EGRT) Sensor
WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
The EGRT sensor is a thermistor type sensor. The EGRT sensor is an input to the PCM and monitors the exhaust gas temperature after the EGR cooler. The electrical resistance of the sensor increases as the temperature decreases, and the resistance decreases as the temperature increases. The varying resistance changes the voltage drop across the sensor terminals and provides electrical voltage to the PCM corresponding to temperature.
The EGRT sensor is used to determine if the EGR cooler is operating correctly.