Normal Operation
WARNING: This page is about a different car, the 2006 Ford Pickup, 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The clutch pedal position (CPP) switch, normally closed, supplies a voltage signal to the powertrain control module (PCM) through circuit 306 (TN/LB). When the clutch pedal is applied, the CPP switch moves to the open position causing the PCM to lose the voltage signal and deactivate the speed control.