Differential Pressure Feedback Electronic (DPFE)
WARNING: This page is about a different car, the 1995 Mercury Mystique and 1995 Ford Contour. However, it is still accessible from the selected car via links, so may be relevant.
EGR Transducer
Faults in DPFE transducer or circuit should set a service code. See QUICK TEST in the TESTS W/CODES - EEC-IV (2.5L) article. If service code has not been set, see CIRCUIT TEST DL in the same article for diagnostic procedures.