Recommended Procedure:

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Ford RV Cutaway, 2006 Ford Pickup, 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Econoline. However, it is still accessible from the selected car via links, so may be relevant.

This test determines if the injector circuits and coils are correctly operating. All injectors click simultaneously for approximately 2 seconds, then each individual injector clicks for approximately 1 second in numerical order 1 through 8. If an electrical concern is present, a DTC sets and outputs on the data link at the end of the test when requested by a diagnostic tool.

Turn off all accessories. If the vehicle is equipped with a power take-off (PTO) system or auxiliary idle control, it must be turned off to carry out self-tests.
Carry out the necessary vehicle preparation and a visual inspection. Refer to QUICK TEST OPERATION .
Refer to the diagnostic tool operating manual for instructions.
Key ON, engine OFF.
Carry out the KOEO Injector Electrical Self-Test.
Key in OFF position.
Record the DTCs and carry out the appropriate pinpoint test.