Exhaust Gas Recirculation Temperature (EGRT) Sensor
WARNING: This page is about a different car, the 1994 Mercury Sable, 1994 Mercury Cougar, 1994 Lincoln Continental, 1994 Ford Thunderbird, and 1994 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
EGRT sensor resistance varies with temperature. Sensor is located downstream of EGR valve and its resistance decreases as EGR flow increases. The Powertrain Control Module (PCM) uses EGRT sensor input as an indication that EGR system is functioning properly.