Camshaft Position (CMP) Sensor - 7.3L Diesel Only
WARNING: This page is about a different car, the 2003 Ford RV Cutaway, 2003 Ford Econoline, 2003 Ford E550 Super Duty, 2003 Ford E450 Super Duty, and 2003 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
On the 7.3L DI diesel engines, the CMP sensor provides engine rpm information to the powertrain control module. This rpm input is used to determine shift scheduling and EPC pressure.