Normal Operation
WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
The speed control actuator sends a voltage reference signal through circuit 199 (LB/YE). When the clutch is applied, the clutch pedal position (CPP) switch closes and routes the signal to ground through circuit 359 (GY/RD). Ground is supplied by the powertrain control module (PCM).