Real simple, get car to operating temp, turn it off, have key in ON position, go to enhanced on the software screen and then run whatever test you want. If KOER then of course turn the engine on. I'm assuming you have the alex pepper software, otherwise this post is really stupid. You'll get a few codes with the KOER test if you don't hold the brake pedal, don't turn the steering wheel, and some other crap like that.
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15
You'll get a few codes with the KOER test if you don't hold the brake pedal, don't turn the steering wheel, and some other crap like that. 
