The NE signal is generated by the Crankshaft Position Sensor (also called engine speed sensor). The G signal is generated by the Camshaft Position sensor that may be located in the distributor or on the engine.
At the appropriate time during cylinder compression, the ECM sends a signal called IGT to the igniter. This will turn on the transistor in the igniter sending current through the primary winding of the ignition coil. At the optimum time for ignition to occur, the ECM will turn off IGT and the transistor will turn off current flow through the primary winding. The induced current will travel through the coil wire, to the distributor cap, rotor, to the distributor terminal the rotor is pointing at, high tension wire, spark plug, and ground. The rotor position determines the cylinder that receives the spark.
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