Idling speed increase

WARNING: This page does not describe the selected car, but rather 21 other vehicles, including the 2006 BMW Z4, 2006 BMW M3, 2006 BMW M Roadster, 2006 BMW M Coupe, and 2006 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.

The idling speed of the engine is raised by the DME / DDE to 750 RPM if the specified battery charging voltage level is not achieved.

The idling speed is raised when

The alternator is at full capacity
and
The battery's state of charge is too low.