2002 MY OBD-II System Operation Summary - MotorCraftService.com

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DPFE EGR System MonitorThe Delta Pressure Feedback EGR system is a closed loop EGR control system that uses Delta PressureFeedback EGR sensor (DPFE) to measure EGR flow across an orifice in the EGR tube. When the EGR valve isopen, a pressure differential is created across the orifice and measured by the DPFE sensor. This DPFEmeasurement is used to control the EGR vacuum regulator (EVR), which provides vacuum to open and modulatethe EGR valve itself.PCMCONVENTIONALDPFE EGR SYSTEMFRESH AIR INLETEVREGRVALVEINTAKEDPFESENSORDOWNSTREAM (P2)UPSTREAM (P1)FLOW CONTROLORIFICEEXHAUSTDELTA P = P1 - P2FORD MOTOR COMPANY REVISION DATE: OCTOBER 02, 2001 PAGE 28 OF 66
In the 2002 MY, Ford will introduce a revised DPFE system. It functions in the same manner as the conventionalDPFE system, however, the various system components have been combined into a single component called theEGR System Module (ESM). This arrangement increases system reliability while reducing cost. By relocating theEGR orifice from the exhaust to the intake, the downstream pressure signal measures Manifold AbsolutePressure (MAP). 2002 MY implementations will provide the PCM with a differential DPFE signal, identical to theconventional DPFE system. For 2003 MY and beyond, the differential signal will be split up and the PCM willreceive both an upstream pressure signal as well as a downstream pressure/MAP signal. This allows the PCM toget access to a MAP signal without adding an additional MAP sensor.PCMNew ESMDPFE EGR SYSTEMEGR System Module(ESM) ComponentsDPFEsignalEVRMAP SIGNALEGRVALVEFRESH AIR INLETVREFSig RtnEGR DCP1INTAKE(MAP)MAPDPFESENSORDELTA P = P1 - MAPEXHAUSTFORD MOTOR COMPANY REVISION DATE: OCTOBER 02, 2001 PAGE 29 OF 66
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2002 MY OBD-II System Operation Summary - MotorCraftService.com

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