KENR6933 9
Troubleshooting Section
9–There has been an abnormal update.
10 – There is an abnormal rate of change.
11 – The failure
mode is not identifiable.
12 – The device or the component is damaged.
Flash File – This file is software that is inside
the ECM. The file contains all the instructions
(software) fo
r 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 electroni
c service tool over the data link instead
of replacing components.
Fuel Inj ecto
rE-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 e
ach fuel injector. With the use of the
electronic service tool, the service technician can
read status info rmation for the E-Trim. Data for
E-Trim can a
lso be programmed.
FRC – See “Fuel Ratio Control”.
Fuel Pump – See “Fuel Rail Pump”.
Fuel Rail – T
his 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 fue
l 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 eng
ine in order to enable the engine to meet
emissions and performance requirements.
Fuel Rail
Pressure Sensor – Thefuelrailpressure
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
toastheHighPressureFuelRailPump.Thisisa
device th
at 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
pressur
e 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 C ontrol (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
increa
ses the FRC Limit (more fuel into the cylinder).
Full Load Setting (FLS) – The FLS is the parameter
that represent
s 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 t
he engine information ratings plate.
This parameter must be programmed.
Full Torque S
etting (FTS) – The FTS is the
parameter that represents the adjustment for the
engine torque. This adjustment is made at the factory
in order to fin
e 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 determin
e 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 plug
s that are used in the starting aid system.
Harness – The harness is the bundle of wiring
(loom) th
at connects all components of the electronic
system.
Hertz (Hz
)–Hertz is the measure of electrical
frequency in cycles per second.
High Pre
ssure Fuel Ra il Pump – See “Fuel Rail
Pump”.
High Pre
ssure Fuel Rail Pump Solenoid Valve –
See “Fuel Rail Pump Solenoid Valve”.
High Pre
ssure Fuel Rail – See “Fuel Rail”.
Injector Codes – The injector codes or injector trim
codes ar
e numeric codes or alphanumeric codes
that are etched or stamped on individual electronic
unit injectors. These codes are used to fine tune the
fuel del
ivery.
Injector Trim Files – Injector trim files are
downlo
aded 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
electr
onic unit injector. The serial number for the
electronic unit injector must be obtained in order to
retrieve the correct injector trim file.
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