Perkins 1106C Genset Systems Operation Testing And Adjusting page 39

KENR6931
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 Rail
Pump".
High Pressure Fuel Rail Pump Solenoid Valve –
See "Fuel Rail Pump Solenoid Valve".
High Pressure Fuel Rail – See "Fuel Rail".
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. The serial number for the
electronic unit injector must be obtained in order to
retrieve the correct injector trim file.
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.
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.
Intake Manifold Pressure Sensor – The Intake
Manifold Pressure Sensor measures the pressure
in the intake manifold. The pressure in the intake
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 (if equipped).
J1939 CAN Data Link – Logged diagnostic codes
are codes which are stored in the memory. These
codes are meant to be an indicator of possible
causes for intermittent problems. Refer to the
term "Diagnostic Code" in this glossary for more
information.
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
exists, the signal or the supply voltage can no longer
reach the intended destination.
OEM – OEM is an abbreviation for the Original
Equipment Manufacturer. This is the manufacturer of
the machine or the vehicle that uses the engine.
Parameter – A parameter is a value or a limit that
is programmable. This helps determine specific
characteristics or behaviors of the engine.
Parameter Identifier (PID) – A PID is a numerical
code that contains two digits or three digits. A
numerical code is assigned to each component. The
numerical code identifies data via the data link to the
ECM.
Password – A password is a group of numeric
characters or a group of alphanumeric characters
that is designed to restrict access to parameters. The
electronic system requires correct passwords in order
to change some parameters (Factory Passwords).
Refer to Troubleshooting, "Factory Passwords" for
more information.
Programmable Software – The software is
programmed into the ECM. The software contains
all the instructions (software) for the ECM and the
software contains the performance maps for a
specific engine. The software may be reprogrammed
through flash programming.
Power Cycled – Power cycled happens when power
to the ECM is cycled: ON, OFF, and ON. Power
cycled refers to the action of cycling the keyswitch
from any position to the OFF position, and to the
START/RUN position.
Primary Speed/Timing Sensor – This sensor
determines the position of the crankshaft during
engine operation. If the primary speed/timing
sensor fails during engine operation, the secondary
speed/timing sensor is used to provide the signal.
Pulse Width Modulation (PWM) – The PWM is a
signal that consists of pulses that are of variable
width. These pulses occur at fixed intervals. The ratio
of "TIME ON" versus total "TIME OFF" can be varied.
This ratio is also referred to as a duty cycle.
Systems Operation Section
39