Recommended Procedure:

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2007 Ford RV Cutaway, 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Econoline. However, it is still accessible from the selected car via links, so may be relevant.

Connect the scan tool.
Engine at operating temperature.
Key ON, engine OFF.
Refer to the scan tool operating manual for instructions.
Access the EGR System Test on the scan tool.
Carry out the EGR System Test and follow the directions on the scan tool.
If there are no DTCs present, all tests pass and all PIDs displayed are in range (may appear as green on the scan tool), the system is operating correctly at this time. Clear the DTCs, repeat the self-test.
If any of the tests do not pass, refer to the pinpoint test that corresponds to the PID that is out of range (may appear as red on the scan tool).