OBD Operation Summary for 6.7L Diesel - MotorCraftService.com

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EGR System Slow ResponseSlow responding EGR systems are detected through the EGR Closed-loop control limits monitors.EGR Closed-loop Control Limits MonitorThe control system is closed-loop around EGR rate during normal operation, and the limits of the control systemare monitored by observing the control deviation calculated as the difference between the desired EGR rate setpoint (after dynamic correction) and the actual EGR rate determined from an Air System Model. The Air SystemModel EGR estimates the percent of EGR in the cylinder by modeling the induction system based on the MassAirflow Sensor (MAF) reading and an estimate of the airflow over the throttle restriction. EGR mass flow is thencalculated as the difference between the cylinder charge from the speed-density equation and this model of themass airflow into the intake manifold. This model value of the actual EGR flow based on measured values iscompared with the desired EGR rate set point. If there the deviation between the controller set point EGR rate andthe modeled EGR rate exceed calibrated thresholds the system control limit malfunction is indicated.If no air system faults are present, the control limit monitor functions continuously during closed-loop operationonce the engine is warm (ECT>70C). Separate threshold maps are used to indicate the EGR system operation isat its control limits for both the high flow and low flow extremes. Control limit threshold maps are a function ofengine torque and engine speed and are based upon the expected distribution of deviations from a statisticalsampling. An up/down counter is used that counts upward when the control deviation exceeds the calibratedthreshold and counts downward when the control deviation falls below the threshold for the case where the systemoperation is limited to EGR rates higher than the controller set-point. Similarly, the up/down counter counts upwardwhen the rate deviation falls below a calibrated threshold and counts downward when it rises above the thresholdfor the case where the system operation if limited to EGR rates lower than the controller set-point. Once thecounter exceeds a calibrated thresholds for either case a malfunction is detected (P04DA/P04D9).EGR Closed-loop Control Limits Check Operation:DTCsMonitor ExecutionMonitor SequenceMonitoring DurationP04DA (Closed Loop EGR Control At Limit - Flow Too High)P04D9 (Closed Loop EGR Control At Limit - Flow Too Low)ContinuousNoneTypical EGR Closed-loop Control Limits Check Entry Conditions:Entry Condition Minimum MaximumNo Air System FaultsEngine coolant temperature70 deg CFORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 48 OF 157
Typical EGR Closed-loop Control – Threshold MapRPM/TRQ 0 250 500 750 1000 1250 1500 1750 2000 2250 2500 2750 3000 3250 3500 375005010015020025030035040045050055060065070075050 50 50 50 50 50 50 50 50 50 50 50 50 50 50 5050 50 50 50 50 50 50 50 50 50 50 50 50 50 50 5050 50 50 50 50 50 50 50 50 50 50 50 50 50 50 5050 50 50 50 50 50 50 50 50 50 50 50 50 50 50 5050 50 50 50 50 50 50 50 50 50 50 50 50 50 50 5050 50 50 50 50 50 50 50 50 50 50 50 50 50 50 5050 50 50 50 50 50 50 50 50 50 50 50 50 50 50 5050 50 50 50 50 50 50 50 50 50 50 50 50 50 50 5050 50 50 50 50 50 50 50 50 50 50 50 50 50 50 5050 50 50 50 50 50 50 50 50 50 50 50 50 50 50 5050 50 50 50 50 50 50 50 50 50 50 50 50 50 50 5050 50 50 50 50 50 50 50 50 50 50 50 50 50 50 5050 50 50 50 50 50 50 50 50 50 50 50 50 50 50 5050 50 50 50 50 50 50 50 50 50 50 50 50 50 50 5050 50 50 50 50 50 50 50 50 50 50 50 50 50 50 5050 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50Mass Airflow Closed-loop Control Limits MonitorDuring DPF regeneration the control system is closed-loop around air mass flow and the limits of the controlsystem are monitored by observing the control deviation calculated as the difference between the desired air massflow and the actual mass air flow determined from the MAF sensor. If no air system faults are present, the controllimit monitor function continuously during closed-loop operation. Separate threshold maps are used to indicate thecontrol system operation is at its limits for both the high flow and low flow extremes. Control limit threshold mapsare a function of engine torque and engine speed and are based upon the expected distribution of deviations froma statistical sampling. An up/down debounce counter is used that counts upward when the control deviationexceeds the calibrated threshold and counts downward when the control deviation falls below the threshold for thecase where the system operation is limited mass airflow higher than the controller set point. Similarly, the up/downcounter counts upward when the rate deviation falls below a calibrated threshold and counts downward when itrises above the threshold for the case where the system operation is limited to mass airflow lower than thecontroller set-point. Once the counter exceeds calibrated thresholds for either case a malfunction is detected.FORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 49 OF 157
Page 1 and 2: 2013 MY OBD System OperationSummary
Page 3 and 4: Cam and Crank Sensor: .............
Page 5 and 6: Introduction - OBD-II and EMDOBD-II
Page 7 and 8: Comprehensive Component MonitorGlow
Page 9 and 10: System Schematic 6.7L Chassis Certi
Page 11 and 12: The dynamometer certified applicati
Page 13 and 14: NON-METHANE HYDROCARBON (NMHC) CONV
Page 15 and 16: OXIDES OF NITROGREN (NOx) CONVERTIN
Page 17 and 18: Selective Catalyst Reduction Feedba
Page 20 and 21: Misfire Monitor Operation:DTCsMonit
Page 22 and 23: Fuel Rail Pressure ( FRP ) Rational
Page 24 and 25: Fuel Temperature Sensor Circuit Che
Page 26 and 27: Fuel Pressure Control Valve (PCV) M
Page 28 and 29: Fuel Injector Driver Circuit Monito
Page 30 and 31: Injector Code Missing/Invalid:Injec
Page 32 and 33: Injection Timing / Injection quanti
Page 34 and 35: Feedback control:Fuel Balancing Con
Page 36 and 37: VoltageNominal Voltage Calibration:
Page 38 and 39: EXHAUST GAS SENSOR MONITORAir-Fuel
Page 40 and 41: The NOx sensor is primarily used to
Page 42 and 43: percent O2P0133 (O2 slow response)
Page 44 and 45: EXHAUST GAS RECIRCULATION (EGR) SYS
Page 46 and 47: EGR Cooler/ECB Entry Conditions (Ov
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 96 and 97: MAF Rationality CheckA rationality
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
Page 146 and 147:
Transmission Fluid Temperature Sens
Page 148 and 149:
Shift Solenoid Functional Check Ope
Page 150 and 151:
Pressure Control Solenoid Check Ope
Page 152 and 153:
Transmission OutputsShift Solenoids
Page 154 and 155:
On Board Diagnostic ExecutiveThe On
Page 156 and 157:
I/M Readiness CodeThe readiness fun
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OBD Operation Summary for 6.7L Diesel - MotorCraftService.com

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