Accelerator Pedal Position (APP) Sensor
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2003 Mazda Tribute, 2003 Mazda Protege5, 2003 Mazda Protege, 2003 Mazda MX-5 Miata, and 2003 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
APP sensor is part of the electronic throttle system used only on the Mazda6. The APP sensor converts accelerator pedal pressure to an input signal for the PCM.