OBD Operation Summary for 6.7L Diesel - MotorCraftService.com

Charge Air Cooler MonitoringThe 6.7L engine is equipped with an air to water charge air intercooler. The CAC is on a secondary coolant loop,independent from the main engine coolant system. The temperature at the outlet of the cooler is measured asTCACDs, however the temperature going into the cooler is modeled.To detect a CAC under cooling situation, the efficiency of the cooler is modeled at various speeds and airflows viaa 3d speed/airflow multiplier table, providing a modeled cooler out temperature. Cooler efficiency * compressor outtemperature = modeled cooler out temp. This modeled cooler out temp is then compared to the measured coolantout temp, if the difference is greater than a threshold curve, a fault is detected and a p-code is set.Charge Air Cooler Monitor:DTCsMonitor ExecutionMonitor SequenceSensors OKTypical Monitoring DurationP026A - Charge Air Cooler Efficiency Below ThresholdContinuousNoneECT, MAP, MAF10 seconds for fault detectionTypical Charge Air Cooler Monitor Entry Conditions:Entry condition Minimum MaximumEngine speed1200 rpmEngine coolant temperature70 deg CAmbient air temperature-7 deg CBarometric Pressure 75 kPa 110 kPaManifold absolute pressure120 kPaIntake air temperature-7 deg CInjection quantity40mg/stkTypical Charge Air Cooler Monitor Malfunction Thresholds:If the difference of measured temperature and modeled temperature is less than -85 C deg at 0 deg Ccompressor out temp, or less than 0 C deg at 250 deg C compressor out temp, a fault is set.FORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 57 OF 157