Programmed Fuel Injection, or PGMFI/PGM-FI, is the name given by Honda to a proprietary electronic fuel injection system for internal combustion engines which injects the right amount of fuel per cylinder based on specific engine data, available since the late 1980s. This system has been implemented on motorcycles and automobiles.
Originally developed for racing cars, PGM-FI made its way into Honda automobiles in the late 1980s in their Accord and Prelude models with A20A, A20A3 & A20A4 engines (Honda A engine).In 1998, Honda built the first motorcycle with PGM-FI, the VFR800FI.
The Engine Control Unit (ECU) has sensors which measure the temperatures of the engine, coolant, oil, and outside air as well as pressure sensors to monitor oil and barometric pressure. Based on these readings and the location of the throttle, the ECU calculates how much oxygen and fuel should be mixed for optimal and efficient performance.