OBD Operation Summary for Fiesta - MotorCraftService.com

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Barometric Pressure SensorThe purpose of the diagnosis shall be to detect electrical faults as defined by OBD I requirements.The signal of the altitude pressure sensor on the A/D-input of the microcontroller is checked.Barometric Pressure Sensor Check Operation:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP2227 – Barometric Pressure Sensor "A" Circuit Range/PerformanceP2228 – Barometric Pressure Sensor "A" Circuit LowP2229 – Barometric Pressure Sensor "A" Circuit HighContinuous within entry conditionsNoneTP, MAF, ECT, ambient pressure, supply voltage, VS5 secondsTypical Barometric Pressure Sensor check entry conditions:Entry Condition Minimum MaximumIgnition “ON”Engine runningVehicle speed0 mphEngine at Idle (closed throttle)Mass air flowIntake manifold pressure99.9 kPaEngine Coolant Temperature -48 °CTypical Barometric Pressure Sensor functional check malfunction thresholds:P2227BARO gradient (Table Based on vehicle speed): > 0 kPa/s ORBARO from last driving cycle minus BARO @engine start): > 540 kPa -ANDmassair flow calculated from BARO sensor minus mass air flow): > 2047 kg/hP2228Short to ground or open circuit: ≤ 0.85 VP2229Short to battery: ≥ 4.50 VCONTINENTAL REVISED: SEPTEMBER 17, 2010 PAGE 98 OF 111
Ignition CoilThe purpose of this diagnosis function is to detect all major failures, which can happen between the ECU outputand ignition coils.The diagnosis is performed separate for each ignition coil. The feedback signal from the specific ignition coil(following the firing order) is evaluated by the microcontroller.Ignition Coil:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP0351 – Ignition Coil A Primary Control Circuit OpenP2301 – Ignition Coil A Primary Control Circuit HighP0352 – Ignition Coil B Primary Control Circuit OpenP2304 – Ignition Coil B Primary Control Circuit HighContinuous within entry conditionsNoneOposite Coil errors50 msTypical ignition circuit check malfunction thresholds:P0351 & P0352Open circuit: Error detection is performed by ECM circuit driverP2301 & P2304Short to battery: Error detection is performed by ECM circuit driverCONTINENTAL REVISED: SEPTEMBER 17, 2010 PAGE 99 OF 111
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2011 MY OBD System OperationSummary
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Knock Sensor.......................
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In the example above, CATMN_IAF_SUM
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Typical IAF catalyst monitor entry
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Fault processing - Emission Thresho
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Misfire Determination ProcessingCON
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J1979 Misfire Mode $06 DataMonitor
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.020" Leak Switch OpenTypical vehic
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CONTINENTAL REVISED: SEPTEMBER 17,
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NVLD II Module OperationNVLD II mod
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Canister Purge Solenoid, switch and
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Canister Purge valve Functional che
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High Purge Flow Monitor Operation:D
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EVAP Pressure Switch Performance Mo
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NVLD II Communication Check Operati
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O2 sensor voltageSHRTFT, Short Term
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Fuel Monitor Adaption MonitoringErr
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Fuel Monitor Operation:DTCsMonitor
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Upstream HO2S Circuit CheckNoStartM
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HO2S11 circuit check operation:DTCs
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Upstream HO2S Slow Response CheckCO
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Up-Stream Oxygen Sensor Rationality
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Upstream Oxygen Sensor Heater Circu
Page 47 and 48: HO2S Heater Monitor Operation:DTCs
Page 49 and 50: HO2S12 circuit check operation:DTCs
Page 51 and 52: Downstream Oxygen Sensor Slow Respo
Page 53 and 54: Downstream HO2S12 Response Rate Ope
Page 55 and 56: Downstream HO2S12 Functional Check
Page 57 and 58: Downstream HO2S Heater Electrical C
Page 59 and 60: Thermostat MonitorThe coolant therm
Page 61 and 62: ECT Below Thermostat Regulating Tem
Page 63 and 64: Spark Timing MonitorWhen the CSER s
Page 65 and 66: Cold Start Emission Reduction Syste
Page 67 and 68: CSER Monitor OperationDTCMonitor Ex
Page 69 and 70: Variable Camshaft Timing Target Err
Page 71 and 72: Variable Cam Timing Slow ResponseSt
Page 73 and 74: Typical VVT Target Error/Slow Respo
Page 75 and 76: Camshaft/Crankshaft Position Correl
Page 77 and 78: Electronic Throttle ControlThe Elec
Page 79 and 80: Electronic Throttle Control (ETC) M
Page 81 and 82: Electronic Throttle Control (ETC) M
Page 83 and 84: Accelerator and Throttle Position S
Page 85 and 86: ECT Sensor Rationality Check Operat
Page 87 and 88: IAT Rationality TestThe IAT rationa
Page 89 and 90: Ambient Air Temperature Sensor Inpu
Page 91 and 92: Mass Air Flow Range PerformanceTTPS
Page 93 and 94: 5 Volt Sensor Reference Voltage A C
Page 95 and 96: Idle Speed Control MonitorThe Idle
Page 97: Knock SensorTwo basic diagnostic te
Page 101 and 102: Crankshaft Position Sensor MonitorA
Page 103 and 104: Each clutch system consists of:•
Page 105 and 106: 3. Shift drum A motor - controls th
Page 107 and 108: The diagnostic executive controls t
Page 109 and 110: EWMA ExamplesEWMA with FIR and SCL
Page 111: Closed Loop Fuel Control Enable Con
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OBD Operation Summary for Fiesta - MotorCraftService.com

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