Ducati Diavel Workshop Manual page 286

Introduction to the engine control system
Installation location of vertical cylinder coil (B).
Location of vertical cylinder coil connection.
Connection wiring diagram
O Horizontal cylinder coil, R Injection relay. CCM engine control connection, 1 power connection (12V) via injection relay
(brown/white – Bn/W), 3 connection to control unit (grey/black – Gr/Bk), 2 ground (black/Bk).