The powertrain management module (PCM) governs the operation of the ignition coil by sending a selected sign. This sign, typically a pulse width modulated (PWM) sign, dictates when and for the way lengthy the ignition coil ought to energize and discharge, producing the high-voltage spark wanted for combustion. For instance, an extended pulse period instructs the coil to cost for a larger period of time, doubtlessly leading to a extra highly effective spark.
Exact administration of ignition coil exercise by the PCM is crucial for optimizing engine efficiency, gasoline effectivity, and emissions management. Traditionally, ignition timing was managed mechanically. Nonetheless, digital management by means of the PCM permits for dynamic changes based mostly on numerous engine parameters, equivalent to engine pace, load, and temperature. This adaptability permits the engine to function extra effectively and produce fewer pollution throughout a variety of situations.