Perkins 854E-E34TA Systems Operation Testing And Adjusting page 48

48
Engine Operation
High Pressure Fuel Rail – See "Fuel Manifold
(Rail)" .
Injector Trim Codes – Injector trim 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/Boost Pressure
Sensor – The inlet manifold air temperature/pressure
sensor detects the air temperature and pressure 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. 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
nitrous oxide (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
exists, the signal or the supply voltage can no longer
reach the intended destination.
Oxygen Sensor – The oxygen sensor detects the
level of oxygen. The level of oxygen is inputted to the
combustion control.
Parameter – A parameter is a value or a limit that is
programmable. This helps determine specific
characteristics or behaviors of the engine.
This document is printed from SPI². Not for RESALE
Password – A password is a group of numeric
characters or a group of alphanumeric characters that
is designed to restrict access to parameters.
Power Cycling – Power cycling refers to the action of
cycling the keyswitch from any position to the OFF
position, and to the START/RUN position.
Pressure Limiting Valve (PLV) – The PLV is a valve
in the fuel rail that prevents excessive pressure. The
PLV will reduce the pressure to a safe level that will
limit engine operation but the reduced pressure will
not stop the engine.
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.
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.
Illustration 45
Rated Fuel Limit – This is a limit that is based on the
power rating of the engine and on the engine rpm.
The Rated Fuel Limit enables the engine power and
torque outputs to conform to the power and torque
curves of a specific engine model. These limits are in
the flash file and these limits cannot be changed.
Reference Voltage – Reference voltage is a
regulated voltage and a steady voltage that is
supplied by the ECM to a sensor. The reference
voltage is used by the sensor to generate a signal
voltage.
UENR0623
g00284479