Ducati Diavel Workshop Manual page 561

Airbox – Throttle Body
Loosen the clamps (6) that retain the airbox to the intake manifolds, and slide it out of its housing.
Operating on both throttle grip cables (H) and (M), loosen the nuts (L) and, turning the throttle body pulley (G), slide the
two throttle grip cables (H) and (M).
Removal of the fuel injectors
Operating on both intake manifolds, disconnect the connectors (N) that connect the main wiring to the injectors, loosen
the fuel pipe retaining screws (P) and slide out the two injectors (3).