The nozzle is an electromechanical valve in which the check valve needle is pressed against the seat by a spring

When an electrical impulse is applied from the control unit to the electromagnet winding, the needle rises and opens the atomizer hole through which fuel is supplied to the engine intake pipe.

The amount of fuel injected by the injector depends on the duration of the electric pulse.

Reduce the pressure in the fuel system if the engine has just been stopped.

Disconnect the wire from the "negative" terminal of the battery.

Remove the receiver.

Replacing injectors 406 engine

Loosen the clamps and disconnect the fuel supply hose 1 from the fuel line 3 of the engine.

Disconnect the fuel drain hose 4 from the pressure reducing valve.

Disconnect the pads with wires from the connectors 5 of the four injectors

Remove the injector from the engine fuel line

Remove the injector from the engine fuel line. The nozzle is fixed in the opening of the fuel line only with the help of a sealing ring.

Unscrew the two fastening bolts 2 and carefully remove the fuel line 3 of the engine, removing the nozzles from the holes in the intake pipe.

Injectors are fixed in the intake pipe holes only with O-rings.

Install the new injector in reverse order.

Checking the injectors

you need to lower the nozzle of 1 nozzle into a container with gasoline or kerosene and apply compressed air

To check the tightness of the injector valve, lower the nozzle of the 1st injector into a container with gasoline or kerosene and apply compressed air under pressure (~3 kgf/cm2).

If air bubbles come out of the nozzle atomizer, then the nozzle valve is leaky and the nozzle needs to be replaced.

To check the health of the injector solenoid winding, apply 12 V DC to the injector connector.

In this case, a characteristic click should be clearly audible, which indicates the opening of the nozzle valve.

If this does not happen, then the nozzle is defective and must be replaced.

This test can be carried out without removing the nozzle from the vehicle.

The resistance of the injector solenoid coil can be checked with an ohmmeter by connecting it to the injector connector pins.

Resistance should be in the range of 15.5-16 ohms.

If the resistance value is not within the specified limits, replace the nozzle.