F 250 4WD Super Duty V10-6.8L VIN S (2001)
Pressure Feedback Exhaust Sensor: Description and Operation
DIFFERENTIAL PRESSURE FEEDBACK EGR SENSOR
Differential Pressure Feedback EGR Sensor
The differential pressure feedback EGR sensor (Figure 86) is a ceramic, capacitive-type pressure transducer that monitors the differential pressure
across a metering orifice located in the orifice tube assembly. The differential pressure feedback sensor receives this signal through two hoses referred
to as the downstream pressure hose (REF SIGNAL) and upstream pressure hose (HI SIGNAL). The HI and REF hose connections are marked on the
aluminum differential pressure feedback EGR sensor housing for identification (note that the HI signal uses a larger diameter hose). The differential
pressure feedback EGR sensor outputs a voltage proportional to the pressure drop across the metering orifice and supplies it to the PCM as EGR flow
rate feedback.
