2005 MY OBD System Operation Summary for Gasoline Engines

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When the entry conditions for the flow test have been satisfied, a calibrated number of samples of the differencebetween measured MAP and inferred MAP are taken at low, medium and high load regions, with and withoutEGR, to learn the MAP correction terms and then calculate the degradation index. When the number of samples ineach load region is complete, a degradation index value from zero to one is computed. A value near one indicatesthe system is functioning properly whereas a value near zero reflects EGR severe flow degradation.The degradation index is compared to a calibrated threshold to determine if a low flow malfunction has occurred.Once the EGR monitor has been completed, the counter for the number of samples in each load region is reset tozero. If an EGR flow malfunction has occurred, the P0400 DTC flow malfunction is registered.Note: BARO is inferred at engine startup using the KOEO MAP sensor reading. It is updated during high, partthrottle,engine operation.This monitor employs an Exponentially Weighted Moving Average (EWMA) algorithm to improve the robustnessthreshold of the degradation index. During normal customer driving, a malfunction will illuminate the MIL, onaverage, in 3 to 6 driving cycles. If KAM is reset (battery disconnected), a malfunction will illuminate the MIL in 2driving cycles. See the section on EWMA for additional information.EGR Flow Check Operation:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP0400once per driving cycleNoneCPS, ECT, IAT, MAF, MAP (P0106/7/8), TP, BARO not available yet200 seconds (600 data samples)Typical EGR flow check entry conditions:Entry Condition Minimum MaximumEngine RPM 1400 rpm 2600 rpmInferred Ambient Air Temperature 32 o F 140 o FEngine Coolant Temperature 80 o F 250 o FEngine RPM Steady (change/0.050 sec)100 rpmMAP Steady (change/0.050 sec)0.5 in HgEngine Load Steady (change/0.050 sec) 1.5 %BARO22.5 "HgTypical EGR flow check malfunction thresholds:< 0.50 degradation indexJ1979 Mode $06 DataMonitor ID Test ID Description for CAN Units$33 $82 EGR Degradation Index unitlessFORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 68 OF 131
I/M Readiness IndicationIf the inferred ambient temperature is less than 20 o F, greater than 130 o F, or the altitude is greater than 8,000 feet(BARO < 22.5 "Hg), the EGR flow test cannot be reliably done. In these conditions, the EGR flow test issuspended and a timer starts to accumulate the time in these conditions. If the vehicle leaves these extremeconditions, the timer starts decrementing, and, if conditions permit, will attempt to complete the EGR flow monitor.If the timer reaches 800 seconds, the EGR flow test is disabled for the remainder of the current driving cycle andthe EGR Monitor I/M Readiness bit will be set to a “ready” condition after one such driving cycle. Two suchconsecutive driving cycles are required for the EGR Monitor I/M Readiness bit to be set to a "ready" condition.FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 69 OF 131
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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 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: $. 6The Electric Stepper Motor EGR
Page 66 and 67: The MAP sensor is also checked for
Page 70 and 71: 1!2Ford plans to comply with the PC
Page 72 and 73: ETC System Failure Mode and Effects
Page 74 and 75: ;#11!%;11!)The purpose of the TPPC
Page 76 and 77: Currently, vehicles use either an E
Page 78 and 79: Fuel Rail Pressure Sensor Check Ope
Page 80 and 81: Loss of Keep Alive Memory (KAM) pow
Page 82 and 83: CKP Ignition System Check Operation
Page 84 and 85: The Idle Air Control (IAC) solenoid
Page 86 and 87: There are several different styles
Page 88 and 89: The PCM continually calculates a ca
Page 90 and 91: Most vehicle applications no longer
Page 92 and 93: Intermediate Shaft Speed Sensor Fun
Page 94 and 95: Primary Pulley Speed Sensor Functio
Page 96 and 97: Secondary Pulley Pressure Sensor Ch
Page 98 and 99: Typical Shift Solenoid mechanical f
Page 100 and 101: Shift Completion Check Operation:DT
Page 102 and 103: Pressure Control Solenoid Check Ope
Page 104 and 105: Forward Clutch/Reverse Clutch Solen
Page 106 and 107: 4$=%$> );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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