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
After the vehicle has warmed up and normal EGR rates are being commanded by the PCM, the low flow check isperformed. Since the EGR system is a closed loop system, the EGR system will deliver the requested EGR flow aslong as it has the capacity to do so. If the EVR duty cycle is very high (greater than 80% duty cycle), the differentialpressure indicated by the DPFE sensor is evaluated to determine the amount of EGR system restriction. If thedifferential pressure is below a calibratable threshold, a low flow malfunction in indicated (P0401).EGR Flow Check Operation:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP0401once per driving cycleDone after P1405 and P1406 testsCPS, ECT, IAT, MAF, TP70 seconds to register a malfunctionTypical EGR flow check entry conditions:Entry Condition Minimum MaximumEVR Dutycycle 80% 100%Engine RPM2500 rpmMass Air Flow Rate of Change6% program loopInferred manifold vacuum 6 in Hg 10 in HgTypical EGR flow check malfunction thresholds:DPFE sensor voltage: < 6 in H 2 OJ1979 Mode $06 DataTest ID Comp ID Description Units$4A $30 Delta pressure for flow test and thresholdTID 4A replaced by 49 in new 2000 MY softwarein. H 2 0$49 $30 Delta pressure for flow test and threshold in. H 2 0$4B $30 EVR dutycycle for flow test and threshold percentConversion for Test ID $4A: 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
Finally, the differential pressure indicated by the DPFE sensor is also checked at idle with zero requested EGRflow to perform the high flow check. If the differential pressure exceeds a calibratable limit, it indicates a stuck openEGR valve or debris temporarily lodged under the EGR valve seat (P0402).EGR Stuck open Check Operation:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP0402once per driving cycleDone after P1400 and P1401 testsCPS, ECT, IAT, MAF, TP10 seconds to register a malfunctionTypical EGR stuck open check entry conditions:Entry Condition Minimum MaximumEVR dutycycle (EGR commanded off) 0% 0%Engine RPM (after EGR enabled) at idle idleTypical EGR stuck open check malfunction thresholds:DPFE sensor voltage at idle versus engine-off signal: > 0.6 voltsJ1979 Mode $06 DataTest ID Comp ID Description Units$45 $20 Delta pressure for stuck open test and threshold voltsConversion for Test ID $45: Multiply by 0.0156 to get A/D counts (0-1024) or 0.0000763 to get voltageI/M Readiness IndicationIf the inferred ambient temperature is less than 32 o F, or greater than 140 o F, or the altitude is greater than 8,000feet (BARO < 22.5 "Hg), the EGR monitor cannot be run reliably. In these conditions, a timer starts to accumulatethe time in these conditions. If the vehicle leaves these extreme conditions, the timer starts decrementing, and, ifconditions permit, will attempt to complete the EGR flow monitor. If the timer reaches 500 seconds, the EGRmonitor is disabled for the remainder of the current driving cycle and the EGR Monitor I/M Readiness bit will be setto a “ready” condition after one such driving cycle. Starting in the 2002 MY, vehicles will require two such drivingcycles for the EGR Monitor I/M Readiness bit to be set to a "ready" condition.Note: A few 2001 and 2002 MY vehicles do have the above-described bypass logic. If an EGR malfunction isdetected below 32 o F, and the EGR system/monitor has been disabled, the EGR Monitor I/M Readiness bit willretain its current status (possibly "not ready" if DTCs had been recently erased).FORD MOTOR COMPANY REVISION DATE: OCTOBER 02, 2001 PAGE 33 OF 66
- Page 2: 4R70W (RWD) Transmission ..........
- Page 6 and 7: TYPICAL INDEX RATIO CATALYST MONITO
- Page 8 and 9: Misfire MonitorThere are two differ
- Page 10 and 11: Misfire Monitor Operation:DTCsMonit
- Page 12 and 13: AIR System MonitorThe secondary air
- Page 14 and 15: leed-up criteria is exceeded on thr
- Page 16 and 17: EVAP System Monitor - 0.020” dia.
- Page 18 and 19: Ford’s 0.020” evaporative syste
- Page 20 and 21: Typical 0.020” EVAP abort (fuel s
- Page 22 and 23: Additional malfunctions that are be
- Page 24: HO2S MonitorFront HO2S SignalThe ti
- Page 27 and 28: HO2S Heaters, front and rearThe HO2
- Page 29 and 30: In the 2002 MY, Ford will introduce
- Page 31: After the vehicle is started, durin
- Page 35 and 36: EGR flow is monitored using an anal
- Page 37 and 38: Typical EGR flow check entry condit
- Page 39 and 40: Comprehensive Component Monitor - E
- Page 41 and 42: Ignition System Check Operation:DTC
- Page 43 and 44: The Intake Manifold Runner Control
- Page 45 and 46: Most vehicle applications no longer
- Page 47 and 48: Transmission Fluid Temperature Sens
- Page 49 and 50: Torque Converter Clutch Check Opera
- Page 51 and 52: 4R70W (RWD) Transmission(no turbine
- Page 53 and 54: CD4E (FWD) Transmission(has turbine
- Page 55 and 56: 5R55E (RWD) Transmission(has turbin
- Page 57 and 58: Direct One Way ClutchThe Direct One
- Page 59 and 60: Direct One Way ClutchThe Direct One
- Page 61 and 62: 4F27E (FN) (FWD) Transmission(has t
- Page 63 and 64: Exponentially Weighted Moving Avera
- Page 65 and 66: I/M Readiness CodeThe readiness fun
Finally, the differential pressure indicated by the DPFE sensor is also checked at idle with zero requested EGRflow to perform the high flow check. If the differential pressure exceeds a calibratable limit, it indicates a stuck openEGR valve or debris temporarily lodged under the EGR valve seat (P0402).EGR Stuck open Check <strong>Operation</strong>:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP0402once per driving cycleDone after P1400 and P1401 testsCPS, ECT, IAT, MAF, TP10 seconds to register a malfunctionTypical EGR stuck open check entry conditions:Entry Condition Minimum MaximumEVR dutycycle (EGR <strong>com</strong>manded off) 0% 0%Engine RPM (after EGR enabled) at idle idleTypical EGR stuck open check malfunction thresholds:DPFE sensor voltage at idle versus engine-off signal: > 0.6 voltsJ1979 Mode $06 DataTest ID Comp ID Description Units$45 $20 Delta pressure for stuck open test and threshold voltsConversion for Test ID $45: Multiply by 0.0156 to get A/D counts (0-1024) or 0.0000763 to get voltageI/M Readiness IndicationIf the inferred ambient temperature is less than 32 o F, or greater than 140 o F, or the altitude is greater than 8,000feet (BARO < 22.5 "Hg), the EGR monitor cannot be run reliably. In these conditions, a timer starts to accumulatethe time in these conditions. If the vehicle leaves these extreme conditions, the timer starts decrementing, and, ifconditions permit, will attempt to <strong>com</strong>plete the EGR flow monitor. If the timer reaches 500 seconds, the EGRmonitor is disabled for the remainder of the current driving cycle and the EGR Monitor I/M Readiness bit will be setto a “ready” condition after one such driving cycle. Starting in the <strong>2002</strong> <strong>MY</strong>, vehicles will require two such drivingcycles for the EGR Monitor I/M Readiness bit to be set to a "ready" condition.Note: A few 2001 and <strong>2002</strong> <strong>MY</strong> vehicles do have the above-described bypass logic. If an EGR malfunction isdetected below 32 o F, and the EGR system/monitor has been disabled, the EGR Monitor I/M Readiness bit willretain its current status (possibly "not ready" if DTCs had been recently erased).FORD MOTOR COMPANY REVISION DATE: OCTOBER 02, 2001 PAGE 33 OF 66
Change language