Sequential injection system (SEFI)
The SEFI system uses electrical pulses of precisely limited duration to control the injection of fuel through injectors directly into the intake port of each of the engine's combustion chambers. The moment and duration of the opening time of each of the injectors is controlled by the power control module (RSM). The PCM continuously monitors various operating parameters of the engine and, based on the incoming information, determines the required amount of fuel injected into each of the intake ports. The throttle body in this case serves only to control the air supply to the system. Because each cylinder is equipped with its own injector, this system allows very precise control of the air/fuel mixture.
Fuel pump and fuel lines
The supply of fuel from the gas tank to the injection system and the return of its excess back to the gas tank is carried out through two metal lines laid under the bottom of the car. The electric fuel pump is located inside the gas tank and is integrated into a single assembly with the fuel flow sensor unit. The fuel vapor return system carries out the removal of fuel vapors back to the gas tank through a separate return line.
Main relay PGM-FI (fuel pump relay) equipped with primary and secondary electrical circuits. With the ignition on, the primary circuit supplies power to the PCM, the injection injectors, and to the secondary relay circuit, which in turn powers the fuel pump. The fuel pump is energized for two seconds when the ignition key is turned to the ON position and continuously when the engine is running.
Exhaust system
The exhaust system consists of an exhaust manifold, an overhead (before the catalytic converter) and downstream (after catalytic converter) oxygen sensors (l-probes), 3-functional (reduction) catalytic converter, muffler and exhaust pipe.
The catalytic converter is one of the main components of the exhaust gas toxicity reduction system and is discussed in more detail in Chapter Engine management systems.