Crankshaft position sensor, revolutions or camshaft:
This sensor also operates the HALL effect, capturing the engine’s revolutions for calculating the amount of fuel needed, as well as to monitor the crankshaft’s position; sending a signal to the ignition system, indicating the exact moment that each piston reaches its maximum travel length.

Mass air flow meter:
Measures the amount of air sucked in at each moment, through its temperature, a platinum thread or a hot film, therefore the computer can modify the injection timing based on this signal.

Air and engine temperature sensor:
It monitors the engines inner temperature; therefore the computer can proceed to adjust the fuel mixture and ignition timing when it receives the signal that engine’s work temperature has been reached.

Potentiometer or butterfly sensor:

Communicates different engine modes to the command module.