manifold (rail).
Fuel Manifold (Rail) – This item is sometimes
referred to as the High Pressure Fuel Rail. The fuel
rail supplies fuel to the electronic unit injectors. The
fuel injection pump and the fuel pressure sensor work
with the ECM in order to maintain the desired fuel
pressure in the fuel rail. This pressure is determined
by calibration of the engine in order to enable the
engine to meet emissions and performance
requirements.
Fuel Manifold (Rail) Pressure Sensor – The fuel
rail pressure sensor sends an electronic signal to the
ECM that is dependent on the pressure of the fuel in
the fuel rail.
Fuel Ratio Control (FRC) – The FRC is a limit that is
based on the control of the fuel to the air ratio. The
FRC is used for emission control. When the ECM
senses a higher turbocharger outlet pressure, the
ECM increases the limit for the FRC in order to allow
more fuel into the cylinders.
The Suction Control Valve for the Fuel Injection
Pump – This is sometimes referred to as the High
Pressure Fuel Rail Pump Suction Control Valve. This
is a control device in the fuel injection pump. The
ECM controls the pressure in the fuel rail by using
this valve to divert excess fuel from the pump to the
fuel tank.
Full Load Setting (FLS) – The FLS is the number
that represents the fuel system adjustment. This
adjustment is made at the factory in order to fine-tune
the fuel system. The correct value for this parameter
is stamped on the engine information ratings plate.
This parameter must be programmed.
Glow Plug – The glow plug is an optional starting aid
for cold conditions. One glow plug is installed in each
combustion chamber in order to improve the ability of
the engine to start. The ECM uses information from
the engine sensors such as the engine temperature
to determine when the glow plug relay must provide
power to each glow plug. Each of the glow plugs then
provides a very hot surface in the combustion
chamber in order to vaporize the mixture of air and
fuel. This improves ignition during the compression
stroke of the cylinder.
Glow Plug Relay – The glow plug relay is controlled
by the ECM in order to provide high current to the
glow plugs that are used in the starting aid system.
Harness – The harness is the bundle of wiring (loom)
that connects all components of the electronic
system.
Hertz (Hz) – Hertz is the measure of frequency in
cycles per second.
High Pressure Fuel Rail Pump – See “Fuel
Injection Pump” .
High Pressure Fuel Rail – See “Fuel Manifold
(Rail)” .
Injector Trim Codes – Injector trim codes are codes
that contain 30 characters. The codes are supplied
with new injectors. The code is input through the
electronic service tool into the ECM. The injector trim
codes compensate for variances in manufacturing of
the electronic unit injector and for the life of the
electronic unit injector.
Inlet Manifold Air Temperature Sensor – The inlet
manifold air temperature sensor detects the air
temperature in the inlet manifold. The ECM monitors
the air temperature and other data in the inlet
manifold in order to adjust injection timing and other
performance functions.
Inlet Manifold Pressure Sensor – The Inlet
Manifold Pressure Sensor measures the pressure in
the inlet manifold. The pressure in the inlet manifold
may be different to the pressure outside the engine
(atmospheric pressure). The difference in pressure
may be caused by an increase in air pressure by a
turbocharger.
Integrated Electronic Controls – The engine is
designed with the electronic controls as a necessary
part of the system. The engine will not operate
without the electronic controls.
J1939 CAN Data Link – This data link is a SAE
standard diagnostic communications data link that is
used to communicate between the ECM and other
electronic devices.
Logged Diagnostic Codes – Logged diagnostic
codes are codes which are stored in the memory.
These codes are an indicator of possible causes for
intermittent problems. Refer to the term “Diagnostic
Trouble Codes” for more information.
NOx Reduction System – The NOx Reduction
System recycles a portion of the exhaust gases back
into the inlet air in order to reduce the amount of
oxides of nitrogen (NOx) in the exhaust gases. The
recycled exhaust gas passes through a cooler before
being introduced into the inlet air.
OEM – OEM is an abbreviation for the Original
Equipment Manufacturer. This is the manufacturer of
the machine or the vehicle that uses the engine.
Open Circuit – An open circuit is a condition that is
caused by an open switch, or by an electrical wire or
a connection that is broken. When this condition
UENR4490-01
77
Engine Operation
This document has been printed from SPI2. NOT FOR RESALE
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