The PCM of a vehicle is the brains behind the power. It is an electric circuit board that operates everything from the car radio and air conditioning to the transmission and fuel delivery.
The procedures included in definitions should be repeatable by anyone or at least by peers. An example of operational definition of the term weight of an object, operationalized to a degree, would be the following: weight is the numbers that appear when that object is placed on a weighing scale.
Operational definitions are the way we measure something we can't see. For example, we can't measure gender dysphoria directly because there is no way to directly know how uncomfortable someone is with their birth gender assignment. Blanchard (1993) created a pure gender dysphoria scale.