OBD Operation Summary for 6.7L Diesel - MotorCraftService.com
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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

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Mass Airflow Closed-loop Control Limits Check Operation:DTCsMonitor ExecutionMonitor SequenceMonitoring DurationP02EC - Diesel Intake Air Flow Control System - High Air Flow DetectedP02ED - Diesel Intake Air Flow Control System - Low Air Flow DetectedContinuousNoneTypical Mass Air Flow Closed-loop Control Limits Check Entry Conditions:Entry Condition Minimum MaximumNo Air System FaultsEngine coolant temperature70 deg CTypical Mass Airflow 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 50FORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 50 OF 157

BOOST PRESSURE CONTROL SYSTEM MONITORINGIntrusive Turbo Position and Response MonitoringThe 6.7L engine is equipped with an oil pressure actuated, variable vane turbocharger. Additionally, chassis certapplications have a wastegate for bypassing exhaust gas to assist with controlling boost while in heavy loadsituations. Neither the variable geometry turbo (VGT) nor the wastegate have position sensors, so turbo andwastegate position is inferred using a duty cycle to position transfer function. To verify actual position based on thenominal transfer function, an intrusive monitor sweep is performed. When entry conditions are met, the intrusivemonitor for VGT fixes the EGR valve to a specific position, closes the wastegate, and then commands an inferredturbo position of 25%, then 85% within a calibratable time. The minimum and maximum MAP values are savedand compared to a threshold. If the desired separation in MAP pressure isn’t achieved, a fault is detected. If thedesired separation in MAP is achieved prior to the full 10 seconds allotted, the test is aborted and considered apass.In the example above, at 383 seconds, the EGR valve is set to 10%; one second later turbocharger is commandedto 25%. The 25% position is held for 5 seconds to allow MAP to stabilize. After 5 seconds, turbocharger isramped back to 85%. Since the pressure rise in MAP was greater than 4.5 kPa, this test was a "pass".FORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 51 OF 157

BOOST PRESSURE CONTROL SYSTEM MONITORINGIntrusive Turbo Position and Response MonitoringThe <strong>6.7L</strong> engine is equipped with an oil pressure actuated, variable vane turbocharger. Additionally, chassis certapplications have a wastegate <strong>for</strong> bypassing exhaust gas to assist with controlling boost while in heavy loadsituations. Neither the variable geometry turbo (VGT) nor the wastegate have position sensors, so turbo andwastegate position is inferred using a duty cycle to position transfer function. To verify actual position based on thenominal transfer function, an intrusive monitor sweep is per<strong>for</strong>med. When entry conditions are met, the intrusivemonitor <strong>for</strong> VGT fixes the EGR valve to a specific position, closes the wastegate, and then <strong>com</strong>mands an inferredturbo position of 25%, then 85% within a calibratable time. The minimum and maximum MAP values are savedand <strong>com</strong>pared to a threshold. If the desired separation in MAP pressure isn’t achieved, a fault is detected. If thedesired separation in MAP is achieved prior to the full 10 seconds allotted, the test is aborted and considered apass.In the example above, at 383 seconds, the EGR valve is set to 10%; one second later turbocharger is <strong>com</strong>mandedto 25%. The 25% position is held <strong>for</strong> 5 seconds to allow MAP to stabilize. After 5 seconds, turbocharger isramped back to 85%. Since the pressure rise in MAP was greater than 4.5 kPa, this test was a "pass".FORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 51 OF 157

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