Pressure Feedback Exhaust Sensor: Description and Operation

Pressure Feedback Electronic (PFE) EGR Sensor:

The Pressure Feedback EGR (PFE) Sensor is a ceramic capacitive-type pressure sensor. Exhaust pressure or vacuum is converted into a proportional analog voltage signal, which is digitized by the Powertrain Control Module (PCM). The PCM uses the signal received from the PFE sensor to compute optimum EGR flow rate, as well as to monitor EGR flow.