When the required fuel pressure is reached,
the
injection phase
occurs. The needle valve solenoid is
energized and opens the needle valve (
11
). The high
pressure on the needle valve piston is released and
the nozzle needle (
13
) opens. Atomized fuel is
sprayed at high pressure into the engine combustion
chamber.
Fuel injection is stopped by the spill valve opening
once again, at which point the pressure on the piston
(
12
) drops and the nozzle needle (
13
) closes.
The entire injection process is controlled by the
engine management system (EMS).
There are three markings on the injector electrical
connection (
16
) – part number (
17
), trim code (
18
) and
production number (
19
). When changing one or more
injectors the engine control unit (ECU) must be pro-
grammed with new injector trim codes because each
unit injector is unique and the engine is tuned for opti-
mal fuel injection and emissions as low as possible.
The trim code is programmed with the aid of param-
eter programming in VODIA. The programming need
only be carried out for the unit injector(s) replaced.
20-0 Engine Information, General
94
7748841 06-2010
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