Ducati DIAVEL V4 2024 Owner's Manual page 300

Extended rear cylinder deactivation function
The V4 Granturismo was developed with fuel
economy and riding comfort in mind. In particular,
the extended rear bank deactivation system acts
both during stops with the engine running, e.g. at
traffic lights, and when riding at low revs under
certain conditions, so as to reduce fuel consumption
and improve thermal comfort for rider and
passenger. As speed increases or above a certain
acceleration demand, i.e. torque demand from the
twistgrip, the rear cylinders are reactivated,
guaranteeing the character and performance of the
V4 Granturismo. The system is active in all Riding
Modes.
Note
In first gear the rear cylinder deactivation
function does not take place.
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