The PGM-FI system precisely controls fuel injection to match engine requirements, reducing emissions and increasing driveability. The electric fuel pump supplies fuel to the pressure regulator. The fuel injectors are electric solenoid valves which open and close according to signals received from the Electronic Control Unit (ECU).
The ECU receives input from various sensors to determine engine operating conditions. This allows the ECU to determine the correct amount of fuel to be injected by it's preset program.