Which alternator system is controlled by the PCM?

In modern vehicles, many alternator systems are controlled by the Powertrain Control Module (PCM), which is a type of electronic control unit that manages the engine and transmission. The PCM is responsible for regulating the alternator's output based on the vehicle's electrical demands, engine speed, and other factors.

One type of alternator system that is commonly controlled by the PCM is the variable voltage alternator system. This system uses sensors to measure the vehicle's electrical demands and adjust the alternator's output voltage accordingly. By doing so, it helps to optimize fuel efficiency and reduce emissions by reducing the load on the engine.