The sensors are what makes a fuel injection system work. The throttle body setup is not complex and dosen’t need many sensors to work. The multipoint or multiport setup is far more complex and needs alot more sensors. The sensors tell the ecm or ecu (computer) how much fuel to inject into the engine and where the timing sould be at. Certain sensors enable different small maps to be enabled. Such as the coolant sensor calls the start up or enrichening map when a certain engine coolant temp has not been reached. Most sensors send a 0 to 5 volt signal back to the ecu. From this value the computer knows where the sensor is operating.
