DIS (Direct Ignition System, see fig. 1)
DIS improves ignition timing accuracy, reduces high voltage losses, and increases overall ignition system reliability by eliminating a distributor.
DIS in this engine is an independent ignition system that has one ignition coil (with igniter) for each cylinder.
Iridium-coated spark plugs are used.
Coil and spark plugs
DIS has 4 ignition coils, one for each cylinder.
The spark plug caps, which provide contact with the spark plugs, are integrated with the ignition coils.
In addition, igniters are used to simplify the system.
Making the center electrode out of iridium gives the same performance as a platinum spark plug, but longer life.