Crankshaft Position (CKP) Sensor
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2005 Ford RV Cutaway, 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.
The CKP sensor is a variable reluctance sensor which responds to a rotating actuator positioned on the crankshaft. The actuator is a 60-2 tooth steel disk with 58 evenly spaced teeth and a minus 2 tooth slot. The sensor produces a sine wave for each tooth edge of the actuator. The sensor output is required to determine crankshaft speed, position, and acceleration.