It is assembled on the engine; the new
calibration code (QR code) must be inserted in
the ECU by means of a diagnostics instrument
(ST_01).
Do NOT fit new or different electronic injectors
without the instruments required to enter the
injector calibration code.
Fuel containing impurities causes serious
damage to the electronic injectors.
The electronic injector for Stage V engines is
different and it is not interchangeable with
other engine
2.9.5 Common Rail
Fuel is injected under pressure into the Common Rail (
Pos.3
), from the high-pressure fuel injection pump.
The internal volume of the Common Rail is optimised to obtain the best compromise in order to
minimise pressure peaks due to the cyclical flow of the injection pump;
Opening the electronic injectors;
The high speed response of the system to the requests of the ECU control unit.
The pressure sensor
5
measures the pressure of the fuel in the Common Rail.
Safety valve
2
, only opens if internal pressure of the Common Rail exceeds the maximum value of 2400 bar.
Pressure inside the Common Rail is regulated by the highpressure fuel injection pump by means of the fuel
intake regulation valve (
Pos. 6 Fig. 2.6
).
The fuel ejected from the safety valve is introduced in the circuit of rejection returning to the tank.
Important
Common Rail is NOT reparaible.
It is NOT possible to perform any maintenance on the fuel pressure sensor 5 , as it is an integral part
of the Common Rail unit.
Do NOT remove the pressure sensor or the fuel pressure limit valve from the Common Rail.
If the pressure sensor or the pressure limit valve are not working, replace the entire Common Rail
unit.