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
Functional Overboost MonitoringThe 6.7L engine utilizes a closed loop boost pressure controller to maintain desired boost pressure set point underall temperature ranges and engine operating modes. The overboost monitor compares the desired vs. actualmeasured boost pressure while in a specific range of closed loop boost pressure operation. If the boost pressuregovernor deviation is greater than the calibrated threshold for 7 seconds, a fault is detected and the P-code is set.The closed loop monitoring window is defined as any inner torque above 50 nm, and any engine speed above1500 rpm.Overboost Monitor:DTCsMonitor ExecutionMonitor SequenceSensors OKTypical Monitoring DurationP0234 - Turbocharger/Supercharger "A" Overboost ConditionContinuousNoneECT, MAP, MAF,7 seconds for fault detectionTypical Overboost Monitor Entry Conditions:Entry condition Minimum MaximumEngine Torque50 NmEngine Speed 1500 4000Typical Overboost Monitor Malfunction Thresholds:If desired boost pressure – actual boost pressure < -11.5 kPa for 7 seconds, a fault is detected.FORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 54 OF 157
Functional Underboost MonitoringThe underboost monitor works in a similar fashion to the overboost monitor by comparing the desired vs. actualmeasured boost pressure while in a specific range of closed loop boost pressure operation. If the boost pressuregovernor deviation is greater than the calibrated threshold for 7 seconds, a fault is detected and the P-code is set.The closed loop monitoring window is defined as any inner torque above 50 nm, and any engine speed above1500 rpm. The threshold limit is wider for the underbooost monitor due to transient boost system response,compensation for boost pressure lag, and short term (1-2 second) momentary torque truncation when air pathtorque is kept high, but fueling is limited for component protection.This diagnostic will detect a gross air path leak such as the turbo discharge or CAC discharge tube being blown off,major pre-turbo exhaust leaks, or a turbo stuck in the full open VGT position.Overboost Monitor:DTCsMonitor ExecutionMonitor SequenceSensors OKTypical Monitoring DurationP1247 - Turbocharger Boost Pressure LowContinuousNoneECT, MAP, MAF,7 secTypical Overboost Monitor Entry Conditions:Entry condition Minimum MaximumEngine Torque50 NmEngine Speed 1500 rpm 4000 rpmTypical Overboost Monitor Malfunction Thresholds:If desired boost pressure – actual boost pressure > 50 kPa for 7 seconds, a fault is detected.FORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 55 OF 157
- 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 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 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
Functional Overboost MonitoringThe <strong>6.7L</strong> engine utilizes a closed loop boost pressure controller to maintain desired boost pressure set point underall temperature ranges and engine operating modes. The overboost monitor <strong>com</strong>pares the desired vs. actualmeasured boost pressure while in a specific range of closed loop boost pressure operation. If the boost pressuregovernor deviation is greater than the calibrated threshold <strong>for</strong> 7 seconds, a fault is detected and the P-code is set.The closed loop monitoring window is defined as any inner torque above 50 nm, and any engine speed above1500 rpm.Overboost Monitor:DTCsMonitor ExecutionMonitor SequenceSensors OKTypical Monitoring DurationP0234 - Turbocharger/Supercharger "A" Overboost ConditionContinuousNoneECT, MAP, MAF,7 seconds <strong>for</strong> fault detectionTypical Overboost Monitor Entry Conditions:Entry condition Minimum MaximumEngine Torque50 NmEngine Speed 1500 4000Typical Overboost Monitor Malfunction Thresholds:If desired boost pressure – actual boost pressure < -11.5 kPa <strong>for</strong> 7 seconds, a fault is detected.FORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 54 OF 157
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