Distributor Ignition (Di) System
WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The profile ignition pickup sensor sends a signal to the Powertrain Control Module (PCM) indicating the engine RPM and the crankshaft position.