2005 MY OBD System Operation Summary for Gasoline Engines

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slosh. If the monitor aborts, it will attempt to run again (up to 20 or more times) until the maximum time-after-startis reached.1#9 2The vapor generation check is initiated by opening the Canister Vent Solenoid for a fixed period of time andreleasing any vacuum. The VMV remains closed.1#4 2In this phase, the sealed system is monitored to determine if tank pressure remains low or if it is rising due toexcessive vapor generation The initial tank pressure is recorded. The pressure is monitored for a change fromthe initial pressure, and for absolute pressure. If the pressure rise due to vapor generation is below the thresholdlimit for absolute pressure and for the change in pressure, and a 0.040” dia leak was indicated in phase 2, aP0442 DTC is stored. If the pressure rise due to vapor generation is below the threshold limit for absolutepressure and for the change in pressure, and a 0.020” dia leak was indicated in phase 2, a 0.020” idle check flagis set to run the 0.020” leak check during idle conditions.!#/The long test times required to detect a 0.020” dia leak in combination with typical road grades can lead to false0.020” leak indications while the vehicle is in motion. The Idle Check repeats Phases 0, 1, and 2 with the vehiclestationary to screen out leak indications caused by changes in altitude. The 0.020” idle check is done under coldstartconditions to ensure that the fuel is cool and cannot pick up much heat from the engine, fuel rail, or fuelpump. This minimizes vapor generation. The 0.020” idle check is, therefore, conducted only during the first 10minutes after engine start.The 0.020” dia leak test entry conditions, test times and thresholds are used. Unique criteria for excessivechanges in load, fuel tank pressure and fuel level are used to indicate fuel slosh. The test is aborted if vehiclespeed exceeds a calibrated threshold, approx. 10 mph. The initial vacuum pull-down (phase 0) can start with thevehicle in motion in order to minimize the required time at idle to complete the test. If the vacuum bleed-up isgreater than the 0.020” dia max. criteria during a single monitoring event, a P0456 DTC is stored. If the vacuumbleed-up is less than the 0.020” dia min. criteria, the pending P0456 DTC may be cleared. If the vacuum bleed-upis in between, no leak assessment is made. A flowchart of the entire 0.020” test sequence is provided below, on asubsequent page.Ford’s 0.020” evaporative system monitor is designed to run during extended, cold-start idle conditions where thefuel is cool and not likely to generate excessive vapors. These conditions will typically occur at traffic lights orimmediately after start-up, (e.g. idle in the driveway).As indicated previously, the 0.020” idle test uses two sets of malfunction thresholds to screen out test results inthe area where “leak” and “no-leak” distributions overlap. Loss of vacuum greater than the 0.020” malfunctioncriteria is designated as a failure. No/low vacuum loss below the pass criteria is designated a pass. Vacuum lossthat is greater than the pass criteria but less that the failure criteria is indeterminate and does not count as a passor a fail.Test results in this overlap area can stem from high volatility fuel at high ambient temperatures. These situationsare not expected to be encountered routinely by customers. Therefore, this strategy will only temporarily hampermonitor performance, while effectively preventing false MIL illumination.A more detailed description of the functional characteristics of the Evaporative Monitor is provided in therepresentative calibration submissions to the agency. Additional calibration information is contained on file byFord Motor Company and may be obtained via agency request.FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 22 OF 131
noDone this cycle,Return to Start.040" entryconditions met?6 hr soak,40-100F, 15-85%fuelyes.020" entryconditions met?6 hr soak, 40-80F,50-85% fuel, idleflag set?noRun Grossleak cruise test1XGross leak?noyesDone this cycle,Store P0455, P0457,P1443 or P1450pending/MIL code*,Return to StartyesClear refueling flagSet refuelingflagyesRefueling event(>20% fuelchange)?noRefuelingflag set?no.020" run timer(10 min)expired?noyesyesRun .040" cruise test3X, use .040" bleedup &slosh criteriaExtend .040 test timeto perform .020" cruisetest 1X, use .020"bleedup, fuel level &slosh criteriaPass .040"test?yesPass .020test?yesnonoDone this cycle,Store P0442pending/MIL code*,Return to Start"Leak" criteria exceeded,set .020" idle flag,done this cycle.Return to Start"Leak" criteria notexceeded, done this cycle,Return to Start2/11/99StartTry to pulldown tank to-7 " H2O during normaldriving in anticipationof idle test* Note: It takes 2 consecutive failures store a DTC and illuminate the MIL.It takes 3 consecutive passes to turn the MIL off.Run .020 Idle test1X, VSS < 3 mph, use.020" bleedup & sloshcriteriaFord 2000 MY 0.020" Dia. Leak Check StrategyPass .020test?yesnoStore P0456 pending/MILcode* if "leak" criteriaexceeded,take no action if inbetween "leak" and"no-leak" limits,done this cycle,Return to StartDone this cycle,Clear .020 Idle flag if lessthan "no-leak" criteria,Erase P0456 pendingcode if set,Return to StartFORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 23 OF 131
Page 1: Table of ContentsIntroduction - OBD
Page 4 and 5: !The Catalyst Efficiency Monitor us
Page 6 and 7: TYPICAL INDEX RATIO CATALYST MONITO
Page 8 and 9: There are three different misfire m
Page 10 and 11: 0#1The acceleration that a piston u
Page 12 and 13: J1979 Misfire Mode $06 DataTest ID
Page 14 and 15: 0$Secondary air systems typically u
Page 16 and 17: 201 34536/#/Vehicles that meet enha
Page 18 and 19: 0.040” EVAP Monitor Operation:DTC
Page 20 and 21: 201 3536/#/Some vehicles that meet
Page 24 and 25: 0.020” EVAP Monitor Operation:DTC
Page 26 and 27: Test ID Comp ID Description for J18
Page 28 and 29: Ford's EONV implementation for Cali
Page 30 and 31: 1#4;!In this phase, the EONV test i
Page 32 and 33: 0.020” EONV EVAP Monitor Operatio
Page 34 and 35: 201!!#/Additional malfunctions that
Page 36 and 37: Fuel Tank Pressures Sensor Offset C
Page 38 and 39: :As fuel system components age or o
Page 40 and 41: -:-The time between HO2S switches i
Page 42 and 43: $-A functional test of the rear HO2
Page 44 and 45: -- 3 amps, (NTK)< 0.400 amps or > 3
Page 46 and 47: 1:$The Delta Pressure Feedback EGR
Page 48 and 49: If an EGR system malfunction is det
Page 50 and 51: After the vehicle has warmed up and
Page 52 and 53: 1:$In the 2002.5 MY, Ford introduce
Page 54 and 55: The ESM may provide the PCM with a
Page 56 and 57: Next, the differential pressure ind
Page 58 and 59: I/M Readiness IndicationIf the infe
Page 60 and 61: The Stepper Motor EGR Monitor consi
Page 62 and 63: Note: BARO is inferred at engine st
Page 64 and 65: $. 6The Electric Stepper Motor EGR
Page 66 and 67: The MAP sensor is also checked for
Page 68 and 69: When the entry conditions for the f
Page 70 and 71: 1!2Ford plans to comply with the PC
Page 72 and 73:
ETC System Failure Mode and Effects
Page 74 and 75:
;#11!%;11!)The purpose of the TPPC
Page 76 and 77:
Currently, vehicles use either an E
Page 78 and 79:
Fuel Rail Pressure Sensor Check Ope
Page 80 and 81:
Loss of Keep Alive Memory (KAM) pow
Page 82 and 83:
CKP Ignition System Check Operation
Page 84 and 85:
The Idle Air Control (IAC) solenoid
Page 86 and 87:
There are several different styles
Page 88 and 89:
The PCM continually calculates a ca
Page 90 and 91:
Most vehicle applications no longer
Page 92 and 93:
Intermediate Shaft Speed Sensor Fun
Page 94 and 95:
Primary Pulley Speed Sensor Functio
Page 96 and 97:
Secondary Pulley Pressure Sensor Ch
Page 98 and 99:
Typical Shift Solenoid mechanical f
Page 100 and 101:
Shift Completion Check Operation:DT
Page 102 and 103:
Pressure Control Solenoid Check Ope
Page 104 and 105:
Forward Clutch/Reverse Clutch Solen
Page 106 and 107:
4$=%$> );4R70E is the replacement f
Page 108 and 109:
! 4%:> );;The Analog Transmission R
Page 110 and 111:
$%$> );;The Digital Transmission Ra
Page 112 and 113:
Direct One Way ClutchThe Direct One
Page 114 and 115:
Direct One Way ClutchThe Direct One
Page 116 and 117:
$&&> %$> );;Transmission Range Sens
Page 118 and 119:
4:=%:.)%:> );;The Transmission Rang
Page 120 and 121:
CFT 30 Mechatronic Illustration;Tra
Page 122 and 123:
Internal TCM Power SupplyIf the pow
Page 124 and 125:
shift, rpm does not go up during a
Page 126 and 127:
The shift solenoids are monitored f
Page 128 and 129:
*> #606Exponentially Weighted Movin
Page 130 and 131:
@$!The readiness function is implem
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2005 MY OBD System Operation Summary for Gasoline Engines

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