Accelerator Pedal Released Position Learning: Description
WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.
Accelerator Pedal Released Position (APP) learning is an operation to learn the fully released position of the accelerator pedal by monitoring the APP sensor output signal. It must be performed each time harness connector of APP sensor or ECM is disconnected.