2002 MY OBD-II System Operation Summary - MotorCraftService.com
2002 MY OBD-II System Operation Summary - MotorCraftService.com 2002 MY OBD-II System Operation Summary - MotorCraftService.com
The Delta Pressure Feedback EGR Monitor is a series of electrical tests and functional tests that monitor variousaspects of EGR system operation.First, the Delta Pressure Feedback EGR (DPFE) sensor input circuit is checked for out of range values (P1400P1401). The Electronic Vacuum Regulator (EVR) output circuit is checked for opens and shorts (P1409).EGR Electrical Check Operation:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP1400, P1401, P1409Continuous, during EGR monitorNone4 seconds to register a malfunctionTypical EGR electrical check entry conditions:EGR system enabledTypical EGR electrical check malfunction thresholds:DPFE sensor outside voltage: > 4.96 volts, < 0.195 voltsEVR solenoid smart driver status indicates open/shortNote: EGR normally has large amounts of water vapor that are the result of the engine combustion process. Duringcold ambient temperatures, under some circumstances, water vapor can freeze in the DPFE sensor, hoses, aswell as other components in the EGR system. In order to prevent MIL illumination for temporary freezing, thefollowing logic is used:If an EGR system malfunction is detected above 32 o F, the EGR system and the EGR monitor is disabled for thecurrent driving cycle. A DTC is stored and the MIL is illuminated if the malfunction has been detected on twoconsecutive driving cycles.If an EGR system malfunction is detected below 32 o F, only the EGR system is disabled for the current drivingcycle. A DTC is not stored and the I/M readiness status for the EGR monitor will not change. The EGR monitor,however, will continue to operate. If the EGR monitor determined that the malfunction is no longer present (i.e., theice melts), the EGR system will be enabled and normal system operation will be restored.FORD MOTOR COMPANY REVISION DATE: OCTOBER 02, 2001 PAGE 30 OF 66
After the vehicle is started, during vehicle acceleration, the differential pressure indicated by the DPFE sensor atzero EGR flow is checked to ensure that both hoses to the DPFE sensor are connected. Under this condition, thedifferential pressure should be zero. If the differential pressure indicated by the DPFE sensor exceeds a maximumthreshold or falls below a minimum threshold, an upstream or downstream DPFE hose malfunction is indicated(P1405 P1406).DPFE EGR Hose Check Operation:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP1405, P1406once per driving cycleDone after P0402 testMAF2 seconds to register a malfunctionTypical DPFE EGR hose check entry conditions:Entry Condition Minimum MaximumEVR dutycycle (EGR commanded off) 0% 0%Mass Air FlowInferred exhaust backpressure13 in H 2 O8 lb/minTypical EGR hose check malfunction thresholds:DPFE sensor voltage: < 7 in H 2 O, > 7 in H 2 OJ1979 Mode $06 DataTest IDCompIDDescription$41 $11 Delta pressure for upstream hose test and thresholdReplaced by TID $42 in new 2000MY softwareUnitsin. H 2 0$42 $11 Delta pressure for upstream hose test and threshold in. H 2 0$41 $12 Delta pressure for downstream hose test and thresholdReplaced by TID $42 in new 2000MY softwarein. H 2 0$42 $12 Delta pressure for downstream hose test and threshold in. H 2 0Conversion for Test ID $41: If value is > 32,767, the value is negative. Take value, subtract 65,536, and thenmultiply result by 0.0078 to get inches of H 2 0. If value is
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After the vehicle is started, during vehicle acceleration, the differential pressure indicated by the DPFE sensor atzero EGR flow is checked to ensure that both hoses to the DPFE sensor are connected. Under this condition, thedifferential pressure should be zero. If the differential pressure indicated by the DPFE sensor exceeds a maximumthreshold or falls below a minimum threshold, an upstream or downstream DPFE hose malfunction is indicated(P1405 P1406).DPFE EGR Hose Check <strong>Operation</strong>:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP1405, P1406once per driving cycleDone after P0402 testMAF2 seconds to register a malfunctionTypical DPFE EGR hose check entry conditions:Entry Condition Minimum MaximumEVR dutycycle (EGR <strong>com</strong>manded off) 0% 0%Mass Air FlowInferred exhaust backpressure13 in H 2 O8 lb/minTypical EGR hose check malfunction thresholds:DPFE sensor voltage: < 7 in H 2 O, > 7 in H 2 OJ1979 Mode $06 DataTest IDCompIDDescription$41 $11 Delta pressure for upstream hose test and thresholdReplaced by TID $42 in new 2000<strong>MY</strong> softwareUnitsin. H 2 0$42 $11 Delta pressure for upstream hose test and threshold in. H 2 0$41 $12 Delta pressure for downstream hose test and thresholdReplaced by TID $42 in new 2000<strong>MY</strong> softwarein. H 2 0$42 $12 Delta pressure for downstream hose test and threshold in. H 2 0Conversion for Test ID $41: If value is > 32,767, the value is negative. Take value, subtract 65,536, and thenmultiply result by 0.0078 to get inches of H 2 0. If value is
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