In order to slow the vehicle, the driver lifts his or her foot off the accelerator and if necessary applies the brakes.
In normal driving, closing the throttle prompts the transmission to upshift to a higher ratio, if it is not already in top gear.
In a higher gear the engine contributes less to the braking process, and when the accelerator is depressed again, a downshift usually takes place.
These unnecessary shifts can be prevented by the Fast-off identification function.
