KOEO Injector Electrical Self-Test

KOEO injector electrical self-test determines if injector solenoids and valves are operating, by buzzing and providing DTCs and audible feedback. DTCs will be output and displayed in KOEO SELF TEST. All injectors will buzz together for approximately 2 seconds, then each injector will buzz for about one second in numerical order (1-8). See Fig 1.

Fig 1: Identifying 7.3L DI Engine, Cylinder & Fuel Injectors

Courtesy of FORD MOTOR CO.