4. Carry Out The Key On Engine Off (KOEO) On-Demand Self-Test: Purpose:: Notes
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.
The purpose of this test is to determine if the PCM has detected any fault conditions that would cause a performance problem.