Fault Detection
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 PCM detects an open or short in the EGR control circuit after the key on engine off (KOEO) test has run and set a diagnostic trouble code (DTC). The EGR actuator can be tested for a stuck or sticking valve by carrying out the output state low test while monitoring the exhaust gas recirculation position (EGRP) percentage.