Ducati Diavel Workshop Manual page 274

Introduction to the engine control system
Absolute pressure sensor readings
As the signals generated by the two absolute pressure (MAP) sensors connected to the two intake manifolds are
fundamental for the speed-density strategy, it is important to understand how the engine control unit reads these signals.
Absolute pressure sensor 1 is connected to the intake duct for cylinder 1 (MAP 1, cylinder 1 - horizontal), whereas
absolute pressure sensor 2 is connected to the intake duct for cylinder 2 (MAP 2, cylinder 2 - vertical). Therefore, MAP 1 is
associated with the base injection map for cylinder 1 (horizontal) and MAP2 is associated with the base injection map for
cylinder 2 (vertical).
The two diagrams compare the engine speed-timing sensor signal with the signals generated by the sensors MAP1 and
MAP2. As can be seen, the intake pressure is measured during the intake stroke for each cylinder (zone C).
The MAP 1 sensor is also used to measure atmospheric pressure. This measurement is taken during the combustion stage
of cylinder 1 (horizontal). In the event of a fault in MAP 1, atmospheric pressure is measured by MAP 2. Information
relative to atmospheric pressure is used by the engine control unit to make the corrections necessary to the fuel-air
mixture in relation to altitude.