OBD Operation Summary for Fiesta - MotorCraftService.com

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NVLD II OverviewThe NVLD II evaporative system monitor consists of an NVLD II module, the Canister Purge Solenoid (CPS) andsoftware in the ECM that enables/disables the monitor, determines fault status and manages fault code storage, Mode$06 data, Mode $09 data, etc.The NVLD II monitor performs a small (0.020“) leak check during engine off and a large leak check during enginerunning. The NVLD II module incorporates a pressure switch and temperature sensor so the monitor also includes acomplete series of auxiliary checks to confirm the integrity of the mechanical and electrical components that make up theentire evap monitoring system. The NVLD II module is powered after the ignition key is turned off so that the entire ECMdoes not have to be powered to perform the engine-off small leak check. This saves a considerable amount of currentdraw from the battery.The following functions are managed by the software in the ECM:- 0.020” small leak detection enablement and fault decision (engine off)- Large leak/fuel cap off detection enablement and fault decision (engine running)- Canister purge solenoid (CPS) (electrical/wiring and mechanical rationality)- NVLD II communications (protocol check and electrical/wiring)The following functions are managed by the NVLD II module- NVLD II pressure switch (electrical/wiring and mechanical rationality check)- NVLD II temperature sensor (rationality and out of range check)- NVLD II timer (rationality check)CONTINENTAL REVISED: SEPTEMBER 17, 2010 PAGE 16 OF 111
CONTINENTAL REVISED: SEPTEMBER 17, 2010 PAGE 17 OF 111
Page 1 and 2: 2011 MY OBD System OperationSummary
Page 3 and 4: Knock Sensor.......................
Page 5 and 6: In the example above, CATMN_IAF_SUM
Page 7 and 8: Typical IAF catalyst monitor entry
Page 9 and 10: Fault processing - Emission Thresho
Page 11 and 12: Misfire Determination ProcessingCON
Page 13 and 14: J1979 Misfire Mode $06 DataMonitor
Page 15: .020" Leak Switch OpenTypical vehic
Page 19 and 20: NVLD II Module OperationNVLD II mod
Page 21 and 22: Canister Purge Solenoid, switch and
Page 23 and 24: Canister Purge valve Functional che
Page 25 and 26: High Purge Flow Monitor Operation:D
Page 27 and 28: EVAP Pressure Switch Performance Mo
Page 29 and 30: NVLD II Communication Check Operati
Page 31 and 32: O2 sensor voltageSHRTFT, Short Term
Page 33 and 34: Fuel Monitor Adaption MonitoringErr
Page 35 and 36: Fuel Monitor Operation:DTCsMonitor
Page 37 and 38: Upstream HO2S Circuit CheckNoStartM
Page 39 and 40: HO2S11 circuit check operation:DTCs
Page 41 and 42: Upstream HO2S Slow Response CheckCO
Page 43 and 44: 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
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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:
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Page 95 and 96:
Idle Speed Control MonitorThe Idle
Page 97 and 98:
Knock SensorTwo basic diagnostic te
Page 99 and 100:
Ignition CoilThe purpose of this di
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Crankshaft Position Sensor MonitorA
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Each clutch system consists of:•
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3. Shift drum A motor - controls th
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The diagnostic executive controls t
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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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