Acceleration Enrichment
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
During acceleration, the pulse width of the fuel injectors is lengthened in order to deliver more fuel. The additional fuel that is required is relative to throttle position (TP) sensor and manifold absolute pressure (MAP) sensor input. Acceleration Enrichment ensures smooth and reliable engine acceleration.