Recommended Procedure:

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2004 Ford RV Cutaway, 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, and 2004 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.

Connect the scan tool. Turn off all accessories. If the vehicle is equipped with an APCM, it must be turned off to perform self tests.

Perform the necessary vehicle preparation and a visual inspection. Refer to QUICK TEST OPERATION .
Refer to the scan tool operating manual for instructions.
Key on, engine off.
Follow operating instructions from the menu.
Record the continuous DTCs and Freeze Frame information and perform the appropriate pinpoint test for continuous DTC diagnostics.
Continuous DTCs must be cleared after a repair.