OBD Operation Summary for 6.7L Diesel - MotorCraftService.com

Cold Start Emission Reduction Component MonitorFor all 2010 and subsequent model year vehicles that incorporate a specific engine control strategy to reduce coldstart emissions, the OBD ll system must monitor the components to ensure proper functioning. The monitor worksby validating the operation of the components required to achieve the cold start emission reduction strategy,namely intake throttle and fuel balancing control.Cold ITH Governor DeviationThe throttle valve has a component level diagnostic to make sure that the valve is not stuck or sticking in a mannersuch that it cannot reach the desired position. The monitor runs if a jammed valve is not already detected, positioncontrol is in closed-loop control, adaptive learning is not active, and EOM3 is active. A minimum engine speed isused as an entry condition.If the position governor deviation is above the maximum calibrated threshold or below the minimum calibratedthreshold, then a timer for detection of the jammed valve fault begins.Actuator Jammed Valve Check Operation:DTCsMonitor executionMonitor SequenceMonitoring DurationP02E1 – Diesel Intake Air Flow Control PerformanceDuring EOM3 after a cold startNone10 seconds to register a malfunctionTypical Actuator Jammed Valve Entry Conditions:Entry Condition Minimum MaximumGovernor Active (closed-loop position control)Adaptive Learning Not ActiveJammed Valve Fault Not Present on ActuatorEOM3 ActiveRPM700 rpmTypical Throttle Jammed Valve Check (P02EC/P02ED) Malfunction Thresholds:Diesel Intake Air Flow Control High Air Flow Detected (P02EC)If ThrVlv_rGovDvt > 29.8Cold FBCFuel Balancing Control is an algorithm designed to reduce differences in injected fuel quantity from cylinder tocylinder. The increase in crankshaft speed due to individual cylinder combustion events is measured. Theamount of fuel injected to each cylinder is then adjusted up or down to minimize the difference in increase incrankshaft speed from cylinder to cylinder. The total amount of fuel injected among all cylinders remains constant.The Cold FBC runs exactly the same as the normal FBC monitor, only difference is that it will run during EOM3instead of EOM0. The concept is shown in the graphic below.FORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 71 OF 157