OBD Operation Summary for Fiesta - MotorCraftService.com

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The fuel system monitor has two distinct monitoring paths. The fast path is used to determine if the lambda controller isunable to maintain fuel control. In this case, the controller has reached the minimum or maximum control limits (lack ofswitching) and a DTC is stored. The slow path is used when normal fuel adaption is taking place on a system undernormal lambda control. If the fuel adaption values reach the minimum or maximum adaption limits, a DTC is stored. Thefuel monitor learns both a slope and offset term. The additive/offset term is learned at idle while the slope/multiplicativeterm is learned at higher loads and engine speeds.Note that Positive Crankcase Ventilation monitoring occurs at idle. A disconnected PCV hose will result in a leancondition at idle that will be detected by the fuel monitor.The diagram below shows the calibratable areas where fuel monitor learning takes place during closed loop fuel control.Requested Fuel Mass (mg/stk)30201060814.0112061408Lambda controller controllimits monitoring area419225.01Multiplicative/slopelearning areaAdditive/offset learning area5.341000 2000 3000 4000 5000 6000Engine Speed (rpm)Similar ConditionsWhen the ECM recognizes a failure in the misfire or fuel systems, the software stores the conditions present when thefault occurred. These conditions recorded include engine speed, engine load (MAF), and warm up status of the firstevent that resulted in the storage of a DTC. These stored conditions are referred to as similar conditions. If the similarconditions are met without a failure in the misfire or fuel system, a flag is set to 1 which allows the driving cycle counter<strong>for</strong> that failure to decrement. Any misfire or fuel system DTCs are erased if similar conditions are not encountered duringthe next 80 driving cycles immediately following the initial detection of the malfunction. The MIL is extinguished afterthree consecutive driving cycles in which similar conditions have been encountered without exceeding the misfire or fuelsystem diagnostic thresholds.CONTINENTAL REVISED: SEPTEMBER 17, 2010 PAGE 32 OF 111
Fuel Monitor Adaption MonitoringError detection in lambdaadaptation learning areasIs lambda adaptationon lean-up limit?NoNoIs lambda adaptationon rich-up limit?YesYesSet the failure symptom andIncrement the concerned timecounterSet the failure symptom andIncrement the concerned timecounterHas the timerexceeded the errorthreshold?NoNoHas the timerexceeded the errorthreshold?YesYesEndError detection in additive orlow multiplicative adaptationlearning areaCONTINENTAL REVISED: SEPTEMBER 17, 2010 PAGE 33 OF 111
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