Fuel Injection System: Operation
The ECU uses input information to determine fuel output from the following sensors and devices: airflow meter, throttle sensor, intake air temperature sensor, atmospheric pressure sensor, engine RPM (ignition pulse), coolant temperature, oxygen sensor and intake manifold vacuum sensor.
After receiving the input information, the ECU will determine the correct fuel pressure at the injectors by sending a signal to the pressure regulator control solenoid valve. The ECU will also control the fuel delivery volume by timing the duration of injector "ON" time.