Throttle Learn: Description
WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
The engine control module (ECM) learns the throttle position of the throttle body assembly to ensure the correct idle operation. Anytime the ECM or the throttle body assembly is replaced, the ECM must learn the throttle position. The engine idle may be unstable or a DTC may set if the throttle position is not learned.