OBD Operation Summary for 6.7L Diesel - MotorCraftService.com
OBD Operation Summary for 6.7L Diesel - MotorCraftService.com OBD Operation Summary for 6.7L Diesel - MotorCraftService.com
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
- 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
MAF Rationality CheckA rationality check of the mass air flow sensor is per<strong>for</strong>med 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 <strong>com</strong>pared 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 <strong>for</strong> each point. These stored values are <strong>com</strong>pared 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 <strong>for</strong> the rationality check.FORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 96 OF 157
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