WARNING: This page is about a different car, the 2009 Acura MDX, 2008 Acura MDX, and 2007 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
As the accelerator pedal position changes, the sensor varies the signal voltage to the PCM.
Fig 1: Identifying Accelerator Pedal Module And APP Sensor A/B