2005 MY OBD System Operation Summary for Gasoline Engines
2005 MY OBD System Operation Summary for Gasoline Engines 2005 MY OBD System Operation Summary for Gasoline Engines
The MAP sensor is also checked for rational values. The value of inferred MAP is checked against the actual valueof MAP at idle and non-idle engine operating conditions.MAP Sensor Rationality Check OperationDTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP0106continuousNonenot applicable10 seconds to register a malfunctionTypical MAP Rationality check entry conditions:Entry Conditions Minimum MaximumChange in load 5%Engine rpm 500 rpm 1800 rpmTypical MAP Rationality check malfunction thresholds:Difference between inferred MAP and actual MAP > 10 in HgThe MAP sensor is also checked for intermittent MAP faults.MAP Sensor Intermittent Check OperationDTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP0109 (non-MIL)ContinuousNonenot applicable2 seconds to register a malfunctionTypical MAP Intermittent check malfunction thresholds:Voltage < 0.024 volts or voltage > 4.96 voltsFORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 66 OF 131
After the vehicle has warmed up and normal EGR rates are being commanded by the PCM, the EGR flow test isperformed. The flow test is performed once per drive-cycle after the remaining entry conditions required to initiatethe test are satisfied.The EGR flow test is done by observing the behavior of two different values of MAP - the analog MAP sensorreading, and inferred MAP, (MAP calculated from the Mass Air Flow Sensor, throttle position, rpm, BARO, etc.).The calculation of inferred MAP is not compensated for EGR flow and, therefore, does not account for the effectsof EGR flow whereas measured MAP does respond to the effects of EGR flow. The amount of EGR flow cantherefore be calculated by looking at the difference between measured MAP and inferred MAP.Measured MAP can be thought of as consisting of three contributors: fresh air drawn into the intake manifold, EGRflow, and a noise/variability term. The following equation describes this:Pmap = Pmaf + Pegr + PnoiseWhere: Pmap = pressure in manifold measured by the MAP sensorPmaf = fresh air pressure without EGR flow, inferred from the MAF sensor, also known asinferred MAPPegr = EGR flow pressure due to EGR flowPnoise = any discrepancy between measured MAP and inferred MAP, without EGRPmaf (inferred MAP) is determined by the amount of fresh air drawn into manifold as measured by the Mass AirFlow (MAF) sensor. Inferred MAP is determined during the engine mapping process with no EGR, as a function ofrpm and loadPegr , the pressure due to EGR contribution can be modeled in the following equation:Pegr = K * (Actual EGR / Desired EGR) * Desired EGRWhere: K = converts EGR pressure to a percent EGR flow rateBy rearranging the equation:Actual EGR / Desired EGR = Pegr / (K * Desired EGR)The ratio of actual to desired EGR will eventually be calculated by the EGR monitor and will reflect how accuratelyEGR is being delivered to the engine.Some differences will always exist between measured MAP and inferred MAP due to hardware variations. Withinsteady engine operating conditions without EGR, it is reasonable to model any differences between inferred andmeasured MAP as an offset and slope that is a function of load. The offset and slope are learned at various loads.This correction can be represented as:MAP correction = Pnoise = M * LOAD + BWhere: B = offset between measured MAP and inferred MAPM = slope which accounts for the difference between measured MAP and inferred MAP as afunction of loadThe terms B and M are learned and compensate for differences between measured MAP and inferred MAP.Rearranging and substituting in the equations above results in the following system model:Actual EGR / Desired EGR = (measured MAP – inferred MAP – MAP correction) / (K * Desired EGR)The Actual EGR / Desired EGR is called the "degradation index". A value near one indicates the system isfunctioning properly whereas a value near zero reflects severe flow degradation.FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 67 OF 131
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- Page 26 and 27: Test ID Comp ID Description for J18
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- Page 44 and 45: -- 3 amps, (NTK)< 0.400 amps or > 3
- Page 46 and 47: 1:$The Delta Pressure Feedback EGR
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- Page 50 and 51: After the vehicle has warmed up and
- Page 52 and 53: 1:$In the 2002.5 MY, Ford introduce
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- 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
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- Page 74 and 75: ;#11!%;11!)The purpose of the TPPC
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- Page 78 and 79: Fuel Rail Pressure Sensor Check Ope
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The MAP sensor is also checked <strong>for</strong> rational values. The value of inferred MAP is checked against the actual valueof MAP at idle and non-idle engine operating conditions.MAP Sensor Rationality Check <strong>Operation</strong>DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP0106continuousNonenot applicable10 seconds to register a malfunctionTypical MAP Rationality check entry conditions:Entry Conditions Minimum MaximumChange in load 5%Engine rpm 500 rpm 1800 rpmTypical MAP Rationality check malfunction thresholds:Difference between inferred MAP and actual MAP > 10 in HgThe MAP sensor is also checked <strong>for</strong> intermittent MAP faults.MAP Sensor Intermittent Check <strong>Operation</strong>DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP0109 (non-MIL)ContinuousNonenot applicable2 seconds to register a malfunctionTypical MAP Intermittent check malfunction thresholds:Voltage < 0.024 volts or voltage > 4.96 voltsFORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 66 OF 131
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