Direct Ignition System (Dis)

DIS is a molded, dual-coil system that supplies energy for ignition at high speeds. System does not use a distributor. Electronic Control Module (ECM) directly activates power transistor for ignition timing control.

When ignition is turned on, battery voltage is applied to ignition coil primary winding. As the crankshaft position sensor shaft rotates, ignition signals are transmitted from the ECM to the power transistor. These signals activate the power transistor, which switches primary current on and off. This action produces high voltage in the secondary winding of the ignition coil.