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
DEF System Pressure ControlDEF pressure is maintained via:Feedback knowledge of sensed pressure.A set point pressure is determined by engine operating conditions (500 kPa over exhaust backpressure). If apressure increase is desired, the urea pump motor speed is increased by increasing the PWM output. Pressuredecreases are analogous; as the system has a backflow throttle, pressure will decrease to 0 unless the pumpmotor in run continuously.Reductant Pressure Control (Normal) Functional Check Operation:DTCsMonitor executionMonitor SequenceSensors/Actuators OKMonitoring DurationP20E8 - Reductant Pressure Too LowP20E9 - Reductant Pressure Too HighContinuousP20E8 & P20E9 are inhibited by active P204b, P204C or P204Dcodesreductant pump pressure sensor, reductant pump motor,reductant injector> 10 sec (resp. > 60 sec, see below)Typical Reductant Pressure Control (Normal) Functional Check Entry Conditions:Entry Condition Minimum MaximumDEF system pressure in closed loop control previouslyTrueTypical Reductant Pressure Control (Normal) Functional Check Malfunction Thresholds:P20E8: < 400 kPa for 60 sec respectively < 300 kPa for 10 secP20E9: > 650 kPa for 10 sec respectively > 790 kPa for 1 secFORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 102 OF 157
Reductant Tank Level SensorThe task of the discrete level sensor is to measure the tank level at 3 different heights. The determination of areductant level is limited to liquid reductant. Frozen reductant cannot be detected. The measured level will be usedto update the calculation of remaining quantity in the reductant tank.The level sensor consists of four high-grade stainless steel pins. The length of each pin defines the tank level(height) which is to be checked. Only three pins can be used for level evaluation. The fourth pin is used as groundpin. Due to the electrical conductivity of Urea the level sensor will determine whether the tank level is above orbelow the respective level sensor position. This information will be directly evaluated by the ECU.Reductant Tank Level Sensor:Reductant Tank Level Sensor Circuit Tree:FORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 103 OF 157
- Page 52 and 53: Note: this monitor also serves to m
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- Page 62 and 63: DPF Restriction MonitorThe DPF is m
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- 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
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- 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
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- Page 90 and 91: Engine Oil Temperature (EOT) Sensor
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- Page 96 and 97: MAF Rationality CheckA rationality
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- 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
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- Page 142 and 143: Miscellaneous ECU Errors:VID Block
- Page 144 and 145: Most vehicle applications no longer
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- Page 150 and 151: Pressure Control Solenoid Check Ope
DEF System Pressure ControlDEF pressure is maintained via:Feedback knowledge of sensed pressure.A set point pressure is determined by engine operating conditions (500 kPa over exhaust backpressure). If apressure increase is desired, the urea pump motor speed is increased by increasing the PWM output. Pressuredecreases are analogous; as the system has a backflow throttle, pressure will decrease to 0 unless the pumpmotor in run continuously.Reductant Pressure Control (Normal) Functional Check <strong>Operation</strong>:DTCsMonitor executionMonitor SequenceSensors/Actuators OKMonitoring DurationP20E8 - Reductant Pressure Too LowP20E9 - Reductant Pressure Too HighContinuousP20E8 & P20E9 are inhibited by active P204b, P204C or P204Dcodesreductant pump pressure sensor, reductant pump motor,reductant injector> 10 sec (resp. > 60 sec, see below)Typical Reductant Pressure Control (Normal) Functional Check Entry Conditions:Entry Condition Minimum MaximumDEF system pressure in closed loop control previouslyTrueTypical Reductant Pressure Control (Normal) Functional Check Malfunction Thresholds:P20E8: < 400 kPa <strong>for</strong> 60 sec respectively < 300 kPa <strong>for</strong> 10 secP20E9: > 650 kPa <strong>for</strong> 10 sec respectively > 790 kPa <strong>for</strong> 1 secFORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 102 OF 157
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