Clutch Pedal Position (CPP) Switch
WARNING: This page is about a different car, the 1995 Ford Pickup, 1995 Ford F-Super Duty, and 1995 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The neutral drive input gives an indication of transmission load to the PCM. This signal affects air/fuel ratio and idle speed.