Ducati Diavel Workshop Manual page 285

Introduction to the engine control system
The image shows the internal electric configuration of the coil. During the primary coil phase, the polarities of the two
voltages inversely polarise the diode (red arrows). When the ECU interrupts power to the primary circuit, the diode is
polarised directly (green arrows), allowing spark generation on the spark plug. PINs 1, 2 and 3 are located on the primary
connection of the coil.
The diagram illustrates the qualitative variation over time of the charge current for the primary coil winding. The ECU
determines the instant t1 (in relation to this time and engine speed, the ignition advance value in degrees is calculated),
in which the connection to ground on PIN3 is interrupted, triggering the spark on the spark plug. At t0, the ECU grounds
coil PIN 3, and current begins to circulate in the primary winding. The instant t0 is calculated by the ECU to allow the
necessary time interval (t1 - t0) to charge the primary coil winding correctly. Typically, the interval t1 - t0 increases with
increasing engine speed.
Component assembling position
Installation location of horizontal cylinder coil (A).
Location of horizontal cylinder coil connection.