WARNING: This page is about a different car, the 2010 Acura TL and 2009 Acura TL. 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 ECM/PCM which then controls the throttle position.
Fig 1: Identifying App Sensor A/B And Accelerator Pedal Module