Petrol injection system in engines 1.1i/1.4i/1.6i (Fiesta 2)

Fuel from the tank is supplied to the CFJ injection device (Fig. 2.116) by a pump located near the tank. This pump supplies 2 dm³ of fuel per minute with a pressure of 2.5 Bar. In the injection device, the fuel pressure is reduced to 1 Bar. This is done by a pressure reducing valve located in the CFJ. Excess fuel is diverted back to the fuel tank via overflow fuel lines. The fuel pump is equipped with a check valve. Thanks to this valve, the fuel pressure in the injection device is maintained when the car is parked.



The CFJ device contains a suction air temperature sensor (Fig. 2.117).



This sensor is an electrical device, and a change in ambient temperature causes a change in its electrical resistance. The engine cooling system has a coolant temperature sensor (Fig. 2.118).





A heated lambda probe, placed in the exhaust system, determines the composition of the exhaust gases and transmits the corresponding signals, which are processed in the microprocessor of the fuel injection control device. A vacuum sensor is placed on the intake manifold (Fig. 2.119).



It is connected to the manifold by an elastic hose. The injection control system also receives signals about the current driving speed. The speed sensor is installed on the gearbox (Fig. 2.120).



The current position of the valve is monitored by a potentiometer (Fig. 2.121), which transmits signals to the CFJ device.





The idle speed is regulated by changing the position of the stop, which is moved by an electric motor (Fig. 2.122).



Fig. 2.123 shows a cross-section of a fuel injector.



The material was copied from an information website (FordBook.ru)