OBD Operation Summary for 6.7L Diesel - MotorCraftService.com

Feedback control:Fuel Balancing Control:Fuel 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 concept is shown in the graphic below.FBC operates in closed-loop control in an engine speed range of 500-1150 rpm, and a commanded injectionquantity of 3.5 – 50 mg/stroke. The maximum allowed correction in fuel quantity for an individual cylinder is givenby the following table.Fuel Balancing Control (FBC) Control Limits:Injection quantity requested before FBC correction (mg/stroke)Maximum allowable FBC correction (mg/stroke): 3.5 7.5 302.3 5 10FORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 34 OF 157