Accelerator Pedal Position (APP) Sensor
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2004 Ford RV Cutaway, 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, and 2004 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.
The accelerator pedal position (APP) sensor is a three-track potentiometer that is used to calculate driver demand for fuel quantity. The sensor receives VREF voltage from the PCM and provides a variable voltage signal directly proportional to the accelerator pedal position. A PCM detected fault of one of the three sensor track signals will permit normal operation. A fault with two sensor signals will only allow the engine to operate at idle.