Ducati Monster 796 Workshop Manual page 235

Description of the system
The engine control system (ignition and injection) relies on several sensors which correct mixture strength according to air
pressure and temperature and engine load. An air temperature sensor (6) located on the intake manifold of the vertical
cylinder and an air pressure sensor (5) located between the "V" of the engine block, connected to the air intakes,
measures the atmospheric pressure and transmits this information to the ECU where it used to make essential
adjustments to the quantity of fuel injected when the motorcycle is ridden at varying altitudes (e.g. a route that starts at
sea level and ends at a high altitude); The ECU also uses this information to adjust the air/fuel ratio according to air
density. (Assuming that the volume of air remains constant, an increase in temperature will lead to a decrease in the air
density and consequently a reduced oxygen content, whereas a fall in temperature will cause an increase in air density
and consequently the oxygen content will rise.
When the temperature is higher, the mixture should be leaner, while if it is lower the mixture should be richer to obtain
the best air-fuel ratio).
The exhaust pipes of horizontal and vertical cylinder are equipped with two lambda sensors (4), (15), which transmit
information to the air-fuel mixture control system.
There is a throttle position sensor (12) fitted on the shaft of the throttle of the rear cylinder. This device sends the ECU a
signal that is an indirect indication of the quantity of air drawn in by the engine (indirect measurement of engine load).