OBD Operation Summary for Fiesta - MotorCraftService.com

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The ECM monitors the "smart" driver fault status bit that indicates either an open circuit, short to power orshort to ground.Injector Check Operation:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP0201 (Cyl 1 injector open)P0261 (Cyl 1 injector low)P0262 (Cyl 1 injector high)P0202 (Cyl 2 injector open)P0264 (Cyl 2 injector low)P0265 (Cyl 2 injector high)P0203 (Cyl 3 injector open)P0267 (Cyl 3 injector low)P0268 (Cyl 3 injector high)P0204 (Cyl 4 injector open)P0270 (Cyl 4 injector low)P0271 (Cyl 4 injector high)Continuous within entry conditionsNoneNo injector errors2 secondsTypical injector circuit check entry conditions:Entry Condition Minimum MaximumIgnition “ON”Typical injector circuit check malfunction thresholds:P0201 & P0202 & P0204 & P0204Open circuit: Error detection is performed by ECM circuit driverP0261 & P0264 & P0267 & P0270Short to ground: Error detection is performed by ECM circuit driverP0262 & P0265 & P0268 & P0271short to battery: Error detection is performed by ECM circuit driverCONTINENTAL REVISED: SEPTEMBER 17, 2010 PAGE 96 OF 111
Knock SensorTwo basic diagnostic tests are performed on each knock sensor – circuit continuity tests and a knock processing chiptests.Due to the design of the knock sensor input circuitry, after filtering and integration, a short to battery, short toground, or open circuit all result is a low knock signal voltage. This voltage is compared to a noise signalthreshold (function of rpm) to determine knock sensor circuit high and circuit low faults.Another indication of a sensor failure is the standard deviation of the signal noise which decreases when there isa failure. The knock signal standard deviation is compared to a threshold (function of rpm).The knock signal processing chip SPI bus is checked to make sure it is not off. This would indicate there is nocommunication between the main processor and the chip used as the interface the knock sensor.Knock Sensor Check Operation:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP0325 – Knock Sensor 1 CircuitP0326 – Knock Sensor 1 Circuit/Range PerformanceP0330 – Knock Sensor 2 CircuitP0331 – Knock Sensor 2 Circuit/Range PerformanceP06B6 - Internal Control Module Knock Sensor Processor 1 PerformanceContinuous within entry conditionsNoneP0326, P0330,P03312.5 secondsTypical Knock Sensor check entry conditions:Entry Condition Minimum MaximumIgnition “ON”Engine Coolant Temperature 42 °CMass Air FlowEngine speed158 mg/stroke1088 rpmTypical Knock Sensor functional check malfunction thresholds:P0325 & P0330Knock signal too low (function of engine speed): < 0.3516 VP0326 & P0331Knock signal standard deviation too low (function of engine speed): < 0.0195 V to 0.0586VP06B6SPI bus failureCONTINENTAL REVISED: SEPTEMBER 17, 2010 PAGE 97 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
Page 45 and 46: 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: Idle Speed Control MonitorThe Idle
Page 99 and 100: Ignition CoilThe purpose of this di
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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