The VG30E engines use a distributor ignition system that works in conjunction with the Engine Control Module (ECM). The various sensors attached to the engine send information to the ECM, which manipulates the ignition timing to achieve maximum power and efficiency.
When the ignition switch is turned ON ,voltage from the battery is applied to the ignition coil. As the shaft of the distributor rotates, the crankshaft sensor sends a signal to the ECM. This signal activates the power transistor to cause ignition coil primary winding current flow from the negative terminal through the power transistor to ground repeatedly. This interruption induces high voltage in the ignition coil secondary windings, which is sent through the distributor, spark plug cable, and finally, the spark plug.