OBD Operation Summary for 6.7L Diesel - MotorCraftService.com

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MAF Rationality CheckA rationality check of the mass air flow sensor is performed each time an air mass adaption (AMA) executes. AMAadapts at two points- one at idle, the other at a specific speed/load. The ratio between the mass air flow and thereference mass air flow is calculated with the EGR valve in the closed position. This ratio is compared against athreshold once AMA has been released. The release of this plausibility check occurs under strict engine operatingand environmental conditions to minimize the affect of outside influences on mass air flow. At each AMA event,the corrected value is stored for each point. These stored values are compared to a threshold, if the stored valuesare greater than a threshold a fault is detected, as the air meter has drifted outside of its nominal operating range.The figure below outlines the strategy for the rationality check.FORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 96 OF 157
Mass Air Flow Sensor Functional Check Operation:DTCsMonitor ExecutionMonitor SequenceSensors OKTypical Monitoring DurationP2073 – Manifold Absolute Pressure/Mass Air Flow - ThrottlePosition Correlation at IdleP2074 – Manifold Absolute Pressure/Mass Air Flow - ThrottlePosition Correlation at Higher LoadOnce per drive cycleNone.MAF (P0100, P0101, P0102), BP (P2228, P2229), EGRP (P0405,P0406, P0404, P0042E, P042F, P1335),ContinuousTypical Mass Air Flow Sensor Functional Check Entry Conditions:Entry condition Minimum MaximumBarometric Pressure 75 kPa 110 kPaEngine Coolant Temperature 70 deg C 90 deg CThrottle Valve 0% 20%CAC Downstream Temperature -20 deg C 80 deg CAmbient Air Temperature -20 deg C 80 deg CTime engine running Normal10 secondsNo Water Penetration Detected inSensorEngine Coolant Temperature at 1second after key onDifference in Barometric Pressureversus Pressure in InductionVolume100 deg C20 kPaEngine Torque 20 Nm 200 NmEngine Speed 550 rpm 750 rpmTypical Mass Air Flow Sensor Functional Check Malfunction Thresholds:If the final AMA stored value in either the idle or higher load cell is greater than 20% or less than -20%, a faultis detected and the appropriate P-code is set.FORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 97 OF 157
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2013 MY OBD System OperationSummary
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Cam and Crank Sensor: .............
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Introduction - OBD-II and EMDOBD-II
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Comprehensive Component MonitorGlow
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System Schematic 6.7L Chassis Certi
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The dynamometer certified applicati
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NON-METHANE HYDROCARBON (NMHC) CONV
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OXIDES OF NITROGREN (NOx) CONVERTIN
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Selective Catalyst Reduction Feedba
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Misfire Monitor Operation:DTCsMonit
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Fuel Rail Pressure ( FRP ) Rational
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Fuel Temperature Sensor Circuit Che
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Fuel Pressure Control Valve (PCV) M
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Fuel Injector Driver Circuit Monito
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Injector Code Missing/Invalid:Injec
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Injection Timing / Injection quanti
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Feedback control:Fuel Balancing Con
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VoltageNominal Voltage Calibration:
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EXHAUST GAS SENSOR MONITORAir-Fuel
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The NOx sensor is primarily used to
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percent O2P0133 (O2 slow response)
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EXHAUST GAS RECIRCULATION (EGR) SYS
Page 46 and 47: EGR Cooler/ECB Entry Conditions (Ov
Page 48 and 49: EGR System Slow ResponseSlow respon
Page 50 and 51: Mass Airflow Closed-loop Control Li
Page 52 and 53: Note: this monitor also serves to m
Page 54 and 55: Functional Overboost MonitoringThe
Page 56 and 57: Threshold Underboost MonitoringThe
Page 58 and 59: PARTICULATE MATTER (PM) FILTER MONI
Page 60 and 61: DPF Incomplete Regeneration Monitor
Page 62 and 63: DPF Restriction MonitorThe DPF is m
Page 64 and 65: Mass Air Flow Sensor Functional Che
Page 66 and 67: Warm-up profiles with nominal therm
Page 68 and 69: Primary Coolant Temp Dynamic Monito
Page 70 and 71: COLD START EMISSION REDUCTION STRAT
Page 72 and 73: FBC operates in closed-loop control
Page 74 and 75: Engine SensorsAir Temperature Ratio
Page 76 and 77: Ambient Air Temperature (AAT) Senso
Page 78 and 79: Charge Air Cooler Temperature (CACT
Page 80 and 81: EGR Cooler Downstream Temperature R
Page 82 and 83: Barometric Pressure and Manifold Ab
Page 84 and 85: Turbine Upstream Pressure Sensor Pl
Page 86 and 87: EGR Valve Position SensorAnalog inp
Page 88 and 89: Engine Coolant & Engine Oil Correla
Page 90 and 91: Engine Oil Temperature (EOT) Sensor
Page 92 and 93: Typical Camshaft and Crankshaft Sen
Page 94 and 95: Typical Fan and Fan Speed Sensor Ch
Page 98 and 99: Mass Air Flow Sensor Plausibility C
Page 100 and 101: Reductant Pressure Sensor Signal Ra
Page 102 and 103: DEF System Pressure ControlDEF pres
Page 104 and 105: Reductant Tank Level Sensor Circuit
Page 106 and 107: Reductant Tank Temperature Circuit
Page 108 and 109: Exhaust Gas Temperature Sensor Rati
Page 110 and 111: Exhaust Gas Temperature Rationality
Page 112 and 113: Diesel Particulate Filter Pressure
Page 114 and 115: Typical Actuator Jammed Valve Entry
Page 116 and 117: ECB Valve Actuator Signal Range Che
Page 118 and 119: Reductant Pump MotorThe Reductant P
Page 120 and 121: Reductant Pump Motor Circuit Checks
Page 122 and 123: Reductant Dosing Valve Circuit Chec
Page 124 and 125: Reverting ValveIn order to reverse
Page 126 and 127: Urea HeatersAqueous urea water solu
Page 128 and 129: Additional plausibility check for h
Page 130 and 131: Engine Control Unit (ECU) Monitor O
Page 132 and 133: Typical Engine Control Unit (ECU) M
Page 134 and 135: Lack of Communication Codes:CAN Com
Page 136 and 137: Glow PlugsThe diesel engine uses gl
Page 138 and 139: Glow Plug Circuit Open Load Check O
Page 140 and 141: Glow Plug Circuit Resistance Out of
Page 142 and 143: Miscellaneous ECU Errors:VID Block
Page 144 and 145: Most vehicle applications no longer
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Transmission Fluid Temperature Sens
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Shift Solenoid Functional Check Ope
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Pressure Control Solenoid Check Ope
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Transmission OutputsShift Solenoids
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On Board Diagnostic ExecutiveThe On
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I/M Readiness CodeThe readiness fun
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OBD Operation Summary for 6.7L Diesel - MotorCraftService.com

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