ETCS (Electronic Throttle Control System)
WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.
To decrease fuel use when the accelerator is pressed quickly, ETCS keeps the throttle response smooth.
When the accelerator is pressed past a certain point, the throttle assumes normal response to maintain acceleration performance.