OBD Operation Summary for 6.7L Diesel - MotorCraftService.com

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Exhaust Gas Temperature Sensor Rationality TestEach EGT Sensor is checked continuously for proper circuit continuity and out of range high values. In addition, arationality test is performed once every drive cycle, after a soak of 6 hours or greater. The rationality test consistsof two components, the first being a comparison against modeled values, and the second being a key-on 5-waytemperature sensor comparison. At key-on, a temperature sample is taken of each of the following sensors:Ambient Air (AAT), Exhaust Gas Temperature (EGT11), Exhaust Gas Temperature (EGT12), Exhaust GasTemperature (EGT13), and Exhaust Gas Temperature (EGT14). Once the engine starts and a cold start has beenconfirmed, the model comparison tests begin. The model comparison tests ensure that each sensor correlates withan expected modeled value, and a fault is set if the difference is significant and persistent. When the modelcomparison tests are complete, the temperature samples from key-on are compared against each other, and thetemperature differences are compared against a threshold. One sensor must fail key-on plausibility with four othersensors to set a fault. If two sensors fail plausibility with three other sensors a general fault is set (P117B). Therationality tests rely on entry conditions that include engine operation time, minimum modeled temperature,minimum engine coolant, and minimum engine torque. Once the entry conditions have been met, the modelcomparisons continue for several minutes to ensure a robust detection. The modeled value for EGT11 is based onModeled Turbo Temperatures. The modeled value for EGT12 is based on EGT11. The modeled value for EGT13is based on EGT12. The modeled value for EGT14 is based on EGT13.Exhaust Gas Temperature (EGT) Sensor Circuit Check:DTCs P0545 – Exhaust Gas Temperature Circuit Low (Sensor 1)P0546 – Exhaust Gas Temperature Sensor Circuit High (Sensor 1)P2478 – Exhaust Gas Temperature Out Of Range (Sensor 1)P2032 – Exhaust Gas Temperature Circuit Low (Sensor 2)P2033 – Exhaust Gas Temperature Sensor Circuit High (Sensor 2)P2479 – Exhaust Gas Temperature Out Of Range (Sensor 2)P242C – Exhaust Gas Temperature Circuit Low (Sensor 3)P242D – Exhaust Gas Temperature Sensor Circuit High (Sensor 3)P247A – Exhaust Gas Temperature Out Of Range (Sensor 3)P2470 – Exhaust Gas Temperature Circuit Low (Sensor 4)P2471 – Exhaust Gas Temperature Sensor Circuit High (Sensor 4)P247B – Exhaust Gas Temperature Out Of Range (Sensor 4)Monitor ExecutionContinuousMonitor SequenceNoneSensors OKNot applicableTypical Monitoring Duration 2 sec.Typical Exhaust Gas Temperature Sensor Circuit Check Entry Conditions:Entry Condition Minimum MaximumBattery Voltage 8v 15vKey OnFORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 108 OF 157
Typical Exhaust Gas Temperature Sensor Circuit Check Malfunction Thresholds:Voltage < .10 volts or voltage > 4.90 voltsOut Of Range test is based on Engineering Units and is high-side only. The Out Of Range Threshold istypically set to 1100 deg C. Transfer function of the sensors does not allow for unique circuit range andengineering range thresholds on the low-side.The Exhaust Gas Temperature Sensor is a PTC Thermistor that provides an analog output voltage proportional tothe exhaust gas temperature. This EGT sensor is capable of being used anywhere in the exhaust gas stream.Some possible applications are listed below:EGTEGR_CITEGR_COTDPF_INDPF_OUTSCR_INSCR_OUTExhaust Gas TempEGR Cooler Inlet Exhaust Gas TempEGR Cooler Outlet Exhaust Gas TempDiesel Particualte Filter Inlet Exhaust Gas TempDiesel Particulate Filter Outlet Exhaust Gas TempSCR Inlet Exhaust Gas TempSCR Outlet Exhaust Gas TempEGT Sensor Transfer FunctionVout = (Vref * R sensor) / (1K + R sensor)Response Time: 1 time constant = 15 sec for 300 deg C step @ 10m/sec gas flowVolts A/D Counts in PCM Ohms Temperature, deg C0.10 short circuit n/a0.73 171 -400.84 202 01.09 277 1001.30 350 2001.48 421 3001.64 490 4001.79 556 5001.91 619 6002.02 691 7002.13 740 8002.17 768 85011004.90 open circuit n/aFORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 109 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
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EGR Cooler/ECB Entry Conditions (Ov
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EGR System Slow ResponseSlow respon
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Mass Airflow Closed-loop Control Li
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Note: this monitor also serves to m
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Functional Overboost MonitoringThe
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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 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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