Perkins NJ Series Troubleshooting Manual page 10

10
Troubleshooting Section
Flash File – This file is software that is inside
the ECM. The file contains all the instructions
(software) for the ECM and the file contains the
performance maps for a specific engine. The file may
be reprogrammed through flash programming.
Flash Programming – Flash programming is the
method of programming or updating an ECM with
an electronic service tool over the data link instead
of replacing components.
Fuel Injector E-Trim – Fuel injector E-trim is a
software process that allows precise control of fuel
injectors by parameters that are programmed into
the ECM for each fuel injector. With the use of the
electronic service tool, the service technician can
read status information for the E-Trim. Data for
E-Trim can also be programmed.
FRC – See "Fuel Ratio Control".
Fuel Pump – See "Fuel Rail Pump".
Fuel 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 rail pump
and the fuel rail 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 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 Rail Pump – This item is sometimes referred
to as the High Pressure Fuel Rail Pump. This is a
device that supplies fuel under pressure to the fuel
rail (high pressure fuel rail).
Fuel Rail Pump Solenoid Valve – This is sometimes
referred to as the High Pressure Fuel Rail Pump
Solenoid Valve. This is a control device in the high
pressure fuel rail 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.
Fuel Ratio Control (FRC) – The FRC is a limit that
is based on the control of the ratio of the fuel to air.
The FRC is used for purposes of emission control.
When the ECM senses a higher intake manifold
air pressure (more air into the cylinder), the FRC
increases the FRC Limit (more fuel into the cylinder).
Full Load Setting (FLS) – The FLS is the parameter
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.
Full Torque Setting (FTS) – The FTS is the
parameter that represents the adjustment for the
engine torque. This adjustment is made at the factory
in order to fine tune the fuel system. This adjustment
is made in conjunction with the FLS. 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 electrical
frequency in cycles per second.
High Pressure Fuel Rail Pump – See "Fuel Rail
Pump".
High Pressure Fuel Rail Pump Solenoid Valve –
See "Fuel Rail Pump Solenoid Valve".
High Pressure Fuel Rail – See "Fuel Rail".
Injector Codes – The injector codes or injector trim
codes are numeric codes or alphanumeric codes
that are etched or stamped on individual electronic
unit injectors. These codes are used to fine tune the
fuel delivery.
Injector Trim Files – Injector trim files are
downloaded from a disk to the ECM. The injector
trim files compensate for variances in manufacturing
of the electronic unit injector and for the life of the
electronic unit injector. The serial number for the
electronic unit injector must be obtained in order to
retrieve the correct injector trim file.
Intake Manifold Air Temperature Sensor – The
intake manifold air temperature sensor detects the
air temperature in the intake manifold. The ECM
monitors the air temperature and other data in the
intake manifold in order to adjust injection timing and
other performance functions.
SENR9982-01