OBD Operation Summary for 6.7L Diesel - MotorCraftService.com

Primary Coolant Temp Dynamic MonitoringTo ensure the primary ECT sensor has not stuck below normal operating range, a simple dynamic check to verifya minimum rise in coolant temperature over a calibratable time has been implemented. If coolant temperature atstart is greater than -35 deg C and less than 54 deg C, the monitor is enabled. At -35 deg C, the coolant isexpected to rise up to -7 deg C in 291 seconds or less. If -7 deg C coolant temp. is not achieved in the required291 second timeframe, a fault is detected. At a -7 deg C start temp, the coolant is expected to rise to 57 deg C in4526 seconds- assuming worst case with EGR off, vehicle idling in neutral with heater on. Again, if the minimumtemperature is not achieved in the required time, a fault is detected. This diagnostic is used in conjunction with theoil vs. coolant plausibility check, thermostat model, and SRC checks to verify proper ECT operation and enginewarm-up.ECT Dynamic Monitor:DTCsMonitor ExecutionMonitor SequenceSensors OKTypical Monitoring DurationP0116 - Engine Coolant Temperature Sensor 1 Circuit Range/PerformanceOnce per tripNoneECT291 seconds at -35 deg C start temp. idle only4526 seconds at -7 deg C start temp, idle onlyTypical ECT Dynamic Monitor Entry Conditions:Entry condition Minimum MaximumEngine coolant temperature -35 deg C 54 deg CEngine speed400 rpmTypical ECT Dynamic Monitor Malfunction Thresholds:291 seconds at -35 deg C start temp to rise to -7 deg C4526 seconds at -7 deg C start temp to rise to 57 deg CFORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 68 OF 157