OBD Operation Summary for Fiesta - MotorCraftService.com

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HO2S12 Heater Monitor Operation:DTCs Sensor 1 P0036 O2 Heater Control Circuit, Bank 1, Sensor 2P0037 O2 Heater Control Circuit Low, Bank 1, Sensor 2P0038 O2 Heater Control Circuit High, Bank 1, Sensor 2P0054 O2 Heater Resistance, Bank 1, Sensor 2Monitor execution once per driving cycle for heater current, continuous for voltage monitoringMonitor Sequence NoneSensors OKHO2S, HO2S heater, MAFMonitoring Duration 400 ms for heater voltage check, 20 sec for heater current checkTypical HO2S12 heater monitor entry conditions:Entry condition Minimum MaximumBattery voltage 11 V 16 VO2 heater pulsewidth 5.07 % 99.6 %Exhaust Gas Temp min P0038 only) 349 °CO2 heater pulsewidth (P0054 only) 1.18 % 99.6 %Modeled Exhaust gas temp at upstream sensor (P0054 only) 750 °CMinimum required cooling energy at upstream position (P0054 only) 10000 JMAF (P0054 only) 25 kg/h 65 kg/hO2 heater on time (P0054 only)180 sTypical HO2S12 heater check malfunction thresholds:P0036Open circuit determined by heater driverP0037Short to ground determined by heater driverP0038Short to battery determined by heater driverP0054Heater resistance: ≥ 300 ohms for 15 of 20 test samplesJ1979 HO2S Heater Mode $06 DataMonitor ID Test ID Description for CAN Units$41 $C1 HO2S11 Heater Resistance Ohms$42 $C2 HO2S21 Heater Resistance OhmsCONTINENTAL REVISED: SEPTEMBER 17, 2010 PAGE 58 OF 111
Thermostat MonitorThe coolant thermostat monitor is designed to detect a thermostat that is slow to open or is stuck open. It is based on thecomparison of the measured Engine Coolant Temperature (ECT) sensor signal and the calculated ECT model. The ECTmodel calculation is depending on engine load/speed and the intake air temperature.A malfunctioning coolant thermostat is detected if the calculated ECT model has exceeded the thermostat openingtemperature and the measured ECT sensor signal remains below a threshold (the highest diagnostic enabletemperature).To prevent false DTCs, conditions for low load, long deceleration duration and Intake Air Temperature (IAT) during themonitoring period are checked. If the monitoring conditions are met, the thermostat DTC is set; otherwise the thermostatmonitor is suspended for the current driving cycle.Thermostat Monitor Method:A comparison between the measured coolant temperature and the “warmed-up temperature” is done after a specifictime interval. The interval itself is based on the coolant temperature model.As soon as the model temperature exceeds the thermostat opening temperature and all other monitoring conditions arefulfilled at the same time, a valid diagnosis occurs.At that time, if the measured coolant temperature is higher than warmed-up temperature, the thermostat is considered tobe a normal thermostat. If the measured coolant temperature is lower than warmed-up temperature, the thermostat isconsidered to be stuck open.CONTINENTAL REVISED: SEPTEMBER 17, 2010 PAGE 59 OF 111
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2011 MY OBD System OperationSummary
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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 and 16: .020" Leak Switch OpenTypical vehic
Page 17 and 18: CONTINENTAL REVISED: SEPTEMBER 17,
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: Downstream HO2S Heater Electrical C
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 and 98: Knock SensorTwo basic diagnostic te
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
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EWMA ExamplesEWMA with FIR and SCL
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Closed Loop Fuel Control Enable Con
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OBD Operation Summary for Fiesta - MotorCraftService.com

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