2005 MY OBD System Operation Summary for Gasoline Engines

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Ford's EONV implementation for California and Green State applications uses a Motorola Star-12 microprocessorin the PCM to process the required inputs and outputs while the rest of the PCM is not powered and the ignitionkey is off. The Star-12 microprocessor draws substantially less battery current than the PCM; therefore, poweringonly the Star-12 during engine-off conditions extends vehicle battery life and allows the EONV monitor to run moreoften. The PCM is the only difference between California/Green State and Federal vehicles.Note that the Neural Network Misfire Monitor also uses the same microprocessor. The pilot EONV implementationis on the 2005 MY F-series Super duty truck with the 5.4L and 6.8L engines.Inputs to EONV Microprocessor• Fuel Level Input (via CAN network from Instrument Cluster)• Fuel Tank Pressure• Battery VoltageOutputs from EONV Microprocessor• Canister Vent Solenoid• 0.020" leak data3445%,.(" 6 1#*,/2 ./----"*1(# )...'0 )' - 0& 7' ) *)("!" 08FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 28 OF 131
1# +81#The purpose of the Stabilization Phase is to allow tank pressure to stabilize after vehicle shutdown (i.e. ignition inthe OFF position). During this phase, the Canister Vent Solenoid (CVS) is open, thus allowing the pressure in thefuel tank to stabilize at atmospheric pressure. The duration of the Stabilization Phase is approximately 2 minutes.A fuel volatility check is performed just prior to its completion.The fuel volatility check measures tank pressure and will abort the test if more than 1.5 "H 2 0 is observed in thetank. Because the CVS is open during this test, it would take a good deal of fuel vaporization to produce thislevel of pressure on a vented system. As an example, this condition may occur when a customer performs a longdrive with highly volatile, winter fuel on a 100-deg F day.If the fuel volatility check passes, a Fuel Tank Pressure Transducer (FTPT) offset correction factor is learned asthe last step of this phase. This correction factor is applied to pressure measurements in the next phase toimprove FTPT accuracy.1#&:;1#At the start of this phase, the CVS is commanded shut, thus sealing up the entire evaporative system. If thesystem is sufficiently sealed, a positive pressure or vacuum will occur during depending on whether the tanktemperature change is positive or negative. Other effects such as fuel vaporization and condensation within thefuel tank will also determine the polarity of the pressure. As the leak size increases, the ability to develop apositive pressure or vacuum diminishes. With a 0.020" leak, there may be no measurable positive pressure orvacuum at all depending on test conditions.During this phase, tank pressure is continuously measured and compared to calibrated detection thresholds (bothpositive pressure and vacuum) that are based on fuel level and ambient temperature. If either the pressure orvacuum threshold is exceeded, the test will be considered a pass, and the monitor will proceed to "Phase 4 –Test Complete". If a positive plateau occurs in tank pressure without exceeding the pass threshold, the monitorwill progress to "Phase 2 – Transition Phase". If a vacuum occurs, the monitor will remain in Phase 1 until thetest times out after 45 minutes have elapsed since key-off, or the pass threshold for vacuum is exceeded. Ineither case, the monitor will transition to "Phase 4 – Test Complete."1# ;1#This phase will occur if a positive pressure plateau occurred in Phase 1 without the positive pass threshold beingexceeded. At the start of the Transition Phase, the CVS is opened and the evaporative system is allowed tostabilize. The Transition Phase lasts approximately 2 minutes, and a new FTPT offset correction is learned justprior to its completion. The monitor will then progress to "Phase 3 – Second Test Phase".Note: This phase is termed the Transition Phase because there is a chance that a vacuum will be seen in thenext phase if a positive pressure plateau occurred in Phase 1. The reason for this is that a positive plateau maybe coincident with vapor temperature starting to decrease, which is favorable for developing a vacuum in the fueltank. This is not always the case, and it is possible to see a positive pressure in Phase 3 as well.1#9 ;1#Upon completion of the Transition Phase, the CVS is commanded shut and the FTPT is monitored for anypositive pressure or vacuum that develops. As with "Phase 1 – First Test Phase", if either the positive pressureor vacuum pass threshold is exceeded, the test is considered a pass and proceeds to "Phase 4 – TestComplete". Also, if the test times out after 45 minutes have elapsed since key-off, the test will be considered a fail(i.e. leak detected) and will also proceed to "Phase 4 – Test Complete".FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 29 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 22 and 23: slosh. If the monitor aborts, it wi
Page 24 and 25: 0.020” EVAP Monitor Operation:DTC
Page 26 and 27: Test ID Comp ID Description for J18
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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