B4000 Regular Cab 4WD V6-4.0L OHV (1997)
Differential Pressure Feedback EGR Sensor: Description and Operation
DIFFERENTIAL PRESSURE FEEDBACK EGR SENSOR (DPFE)
Monitors differential pressure through two hoses referred to as down and upstream pressure hoses and outputs voltage to PCM.
Operation
PCM uses signal to adjust EVR Solenoid duty cycle and achieve desired EGR flow.
NOTE: Marks HI and REF signals on sensor housing for identification (HI signal uses a larger diameter hose). Uses a ceramic capacitive type
pressure transducer.
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If the differential pressure feedback EGR sensor or circuit has an open or short, Diagnostic Trouble Code No. P0400, P0401, P0402, P1400,
P1401 or P1408 is output.
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If exhaust manifold side or intake manifold side hose is off or plugged, DTC No. P1405 or P1406 is output.
