Direct Ignition System (Dis): 2.0L

Ignition system is a 2-coil system that supplies sufficient energy for ignition at high speeds. A distributor is not used since ECM directly activates power transistor for ignition timing control.

Ignition system has 2 power transistors and 2 ignition coils. Power transistor "A" controls primary current of ignition coil "A" to activate spark plugs in cylinders No. 1 and 4. Similarly, power transistor "B" controls ignition coil "B", which activates spark plugs in cylinders No. 2 and 3. In this way, spark plugs of 2 cylinders are activated, but actual ignition takes place only in the cylinder that is on its compression stroke at that time. Power transistors "A" and "B" are activated by signals from ECM, controlling timing and firing of cylinders.

When ignition is turned on, battery voltage is applied to ignition coil primary winding. As crankshaft position sensor shaft rotates, ignition signals are transmitted from ECM to power transistor. These signals activate power transistor, causing ignition coil primary winding current to either repeatedly flow from ignition coil negative terminal through power transistor to ground, or to be interrupted. This action induces high voltage in secondary winding of ignition coil. From ignition coil, secondary winding current flows through spark plug to ground, causing ignition in each cylinder.