Ducati Monster 796 Workshop Manual page 240

System components
The ECU controls injector opening by feeding current to the coil of an electromagnet which creates a magnetic field to
attract the armature, thereby generating fuel spray. If we take the physical characteristics of the fuel to be constant
(viscosity, density), as well as the injector delivery and pressure head (controlled by the fuel pressure regulator), the
amount of fuel injected depends on the duration for which the injector is open. This time is determined by the ECU in
accordance with the engine operating conditions. In this way correct fuel delivery in ensured.
To remove and refit the injectors, refer to Sect. 8 - 6, Removal of the fuel injectors.
Note
To check correct operation of the injector, use the DDS diagnosis instrument and follow the instructions given in
diagnosis" (Sect. 6 - 13).
the paragraph "Guided
The fuel output must be even and the jet should be fully atomised, without droplets.
Do not leave the engine stopped for a long time with the fuel circuit full. The fuel could clog the injectors and render them
inoperable. Periodically, after lengthy periods without running the engine, we recommend adding TUNAP 231 to the
fuel in the tank to help clean critical sections of the fuel circuit.
Stepper motor
The throttle body incorporates an automatic choke function performed by a stepper motor (1).
The stepper motor shaft is fitted with a valve which opens a communicating passage between two ports; one of these
ports (2) is connected to the intake manifold of the vertical cylinder while the other (4) is connected to the intake
manifold of the horizontal cylinder. A third port (3) is connected to the airbox.