Ranger 2WD V6-245 4.0L VIN X SFI (1997)
Pressure Feedback Exhaust Sensor: Description and Operation
Differential Pressure Feedback EGR (DPFE) Sensor
PURPOSE
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The Differential Pressure Feedback (DPFE) Sensor outputs a voltage proportional to the pressure drop across the metering orifice and supplies it
to the Powertrain Control Module (PCM) as EGR flow rate feedback.
OPERATION
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The DPFE receives this exhaust pressure signal through two hoses referred to as the downstream pressure hose (REF SIGNAL) and upstream
pressure hose (HI SIGNAL). The Hi and REF Signals are marked on the DPFE sensor. The DPFE monitors the differential pressure across a
metering orifice located in the orifice tube assembly.
DPFE Sensor Types Available
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There are two visually distinct DPFE sensors being manufactured. One is the original, aluminum-cast housing sensor found on most applications.
The second is a new, plastic housing sensor designed to perform the same function.
