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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Exhaust Gas Temperature Rationality CheckDTCs P0544 – Exhaust Gas Temperature Sensor Circuit (Sensor 1)P2031 – Exhaust Gas Temperature Sensor Circuit (Sensor 2)P242A – Exhaust Gas Temperature Sensor Circuit (Sensor 3)P246E – Exhaust Gas Temperature Sensor Circuit (Sensor 4)P117B – Exhaust Gas Temperature Sensor CorrelationMonitor ExecutionOnce per driving cycle.Monitor SequenceCorrelation Test completes after the Model Comparison Tests.Sensors OKTypical Monitoring Duration Model Comparison Test Monitor Duration is 100 to 300 seconds.Typical Exhaust Gas Temperature Rationality Check Entry Conditions:Entry Condition Minimum MaximumEngine Off Time 4 hrs N/ACoolant Temp 66 deg C N/AEngine Run TimeModeled Sensor TempEngine Torque300 seconds170 deg C for EGT11150 deg C for EGT12130 deg C for EGT13110 deg C for EGT14100 NmTypical Exhaust Gas Temperature Rationality Check Thresholds:Each EGT Rationality is confirmed against 4 other sensors (absolute temperature difference thresholds):Key-On Comparison Threshold50 deg CModeled Comparison Threshold 150 deg C for EGT11, 100 deg C for EGT12, 50 deg C for EGT13, 50deg C for EGT14Modeled Comparison DurationComparison Test will run for 100 to 300 seconds. Fault must persistfor 30 seconds for robust detection.FORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 110 OF 157

Diesel Particulate Filter Pressure Sensor Rationality TestThe DPFP Sensor is checked continuously for proper circuit continuity, rationality, and expected dynamic behavior.The rationality test compares the raw DPFP value in engineering units to a threshold, with the expectation thatthere will be a minimum pressure observed whenever sufficient exhaust flow is present. An additional rationalitytest compares the measured change in DPFP to an expected change, which is based on changing exhaust flows.If exhaust flow is increasing, the change in DPFP is expected to be increasing. If exhaust flow is decreasing, thechange in DPFP is expected to be decreasing. The dynamic test runs continuously as long as exhaust flows aresufficiently dynamic. The fault threshold in kPa is a function of changing exhaust flow.Diesel Particulate Filter Pressure (DPFP) Sensor Circuit Check:DTCsMonitor ExecutionMonitor SequenceSensors OKTypical Monitoring DurationP2454 – DPFP Sensor Circuit LowP2455 – DPFP Sensor Circuit HighContinuousNoneNot applicable2 sec.Typical Diesel Particulate Filter Pressure Sensor Circuit Check Entry Conditions:Entry Condition Minimum MaximumBattery Voltage 8v 15vKey OnTypical Diesel Particulate Filter Pressure Sensor Circuit Check Malfunction Thresholds:Voltage < .10 volts or voltage > 4.90 voltsThe DPFP sensor is a single port gauge sensor that provides an analog output voltage that is proportional topressure and is typically used before and after a DPF (Diesel Particulate Filter) to monitor the differential pressure.DPFP Sensor Transfer FunctionDPFP volts = 0.082 * kPaG Delta Pressure) + 0.45Volts A/D Counts in PCM Delta Pressure, kPa Gauge0.10 20 -4.30.45 92 01.27 260 102.09 428 202.91 595 303.73 763 404.55 931 504.90 1003 54.3FORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 111 OF 157

Exhaust Gas Temperature Rationality CheckDTCs P0544 – Exhaust Gas Temperature Sensor Circuit (Sensor 1)P2031 – Exhaust Gas Temperature Sensor Circuit (Sensor 2)P242A – Exhaust Gas Temperature Sensor Circuit (Sensor 3)P246E – Exhaust Gas Temperature Sensor Circuit (Sensor 4)P117B – Exhaust Gas Temperature Sensor CorrelationMonitor ExecutionOnce per driving cycle.Monitor SequenceCorrelation Test <strong>com</strong>pletes after the Model Comparison Tests.Sensors OKTypical Monitoring Duration Model Comparison Test Monitor Duration is 100 to 300 seconds.Typical Exhaust Gas Temperature Rationality Check Entry Conditions:Entry Condition Minimum MaximumEngine Off Time 4 hrs N/ACoolant Temp 66 deg C N/AEngine Run TimeModeled Sensor TempEngine Torque300 seconds170 deg C <strong>for</strong> EGT11150 deg C <strong>for</strong> EGT12130 deg C <strong>for</strong> EGT13110 deg C <strong>for</strong> EGT14100 NmTypical Exhaust Gas Temperature Rationality Check Thresholds:Each EGT Rationality is confirmed against 4 other sensors (absolute temperature difference thresholds):Key-On Comparison Threshold50 deg CModeled Comparison Threshold 150 deg C <strong>for</strong> EGT11, 100 deg C <strong>for</strong> EGT12, 50 deg C <strong>for</strong> EGT13, 50deg C <strong>for</strong> EGT14Modeled Comparison DurationComparison Test will run <strong>for</strong> 100 to 300 seconds. Fault must persist<strong>for</strong> 30 seconds <strong>for</strong> robust detection.FORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 110 OF 157

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