Ford Transit 2002 Owner's Manual page 848

Six-hole fuel injectors are used.
The very small moving masses of the control valves have made it possible to achieve rapid
switching time of 0.3 ms. This is the response time which the fuel injection system needs to
be able to react rapidly to changes in the operating states.
The fuel injectors have four operating states:
Fuel injector closed
Fuel injector beginning to open
Fuel injector completely opened (fuel injection)
Fuel injector closing
For manufacturing reasons, the fuel injectors have different production tolerances which
can be identified by a number on the injector.
In order to be able to calculate the correct fuel quantity, the PCM must be notified of a
change in the system, in this case the changing of the injectors.
Fuel injector closed
Item Part Number
1 -
2 -
3 -
4 -
5 -
6 -
7 -
8 -
Fuel under pressure is passed from the common rail through the fuel inlet channel, into the
nozzle chamber and then into the control chamber.
The solenoid valve is de-energised, the control valve is closed, and therefore the fuel return
is closed.
In this state the same pressure is present in the nozzle chamber and the control chamber.
Description
Solenoid valve
Fuel return
Needle valve
Control chamber
Nozzle spring
Nozzle needle
Nozzle chamber
Fuel feed
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