Direct Ignition System (Dis)

Battery voltage is supplied through ignition switch to PCM (ECU), ignitor unit, ignition coils and spark plugs. See Fig 1 . PCM triggers ignitor unit based upon signals from CRANK/CYL and other sensors. Each spark plug is fired directly by one of 6 coils. Ignitor controls each coil.

Fig 1: Direct Ignition System (Legend)

Courtesy of AMERICAN HONDA MOTOR CO., INC.