Perkins 1204F-E44TA Systems Operation Testing And Adjusting page 75

UENR4490-01
Diesel Particulate Filter – The Diesel Particulate
Filter filters particulates from the exhaust gases. The
hot exhaust gases burn off the particulates. This
process prevents the DPF from becoming blocked
with soot.
Digital Sensor Return – The common line (ground)
from the ECM is used as ground for the digital
sensors.
Digital Sensors – Digital sensors produce a pulse
width modulated signal. Digital sensors are supplied
with power from the ECM.
Digital Sensor Supply – The power supply for the
digital sensors is provided by the ECM.
Direct Current (DC) – Direct current is the type of
current that flows consistently in only one direction.
Dosing Control Unit (DCU) – The DCU controls the
injection of Diesel Exhaust Fluid (DEF) into the
exhaust gas stream.
DT, DT Connector, or Deutsch DT – This is a type
of connector that is used on this engine. The
connectors are manufactured by Deutsch .
Duty Cycle – See "Pulse Width Modulation" .
Electronic Engine Control – The electronic engine
control is a complete electronic system. The
electronic engine control monitors the engine
operation under all conditions. The electronic engine
control also controls the engine operation under all
conditions.
Electronic Control Module (ECM) – The ECM is the
control computer of the engine. The ECM provides
power to the electronics. The ECM monitors data that
is input from the sensors of the engine. The ECM
acts as a governor in order to control the speed and
the power of the engine.
Electronic Service Tool – The electronic service
tool is used for diagnosing various electronic controls
and the electronic service tool is also used for
programming various electronic controls.
Engine Monitoring – Engine Monitoring is the part
of the electronic engine control that monitors the
sensors. This also warns the operator of detected
problems.
Engine Oil Pressure Sensor – The engine oil
pressure sensor measures engine oil pressure. The
sensor sends an electronic signal to the ECM that is
dependent on the engine oil pressure.
This document has been printed from SPI2. NOT FOR RESALE
Engine Speed/Timing Sensor – An engine speed/
timing sensor is a hall effect switch that provides a
digital signal to the ECM. The ECM interprets this
signal as the crankshaft position and the engine
speed. Two sensors are used to provide the speed
and timing signals to the ECM. The primary sensor is
associated with the crankshaft and the secondary
sensor is associated with the camshaft.
Estimated Dynamic Timing – Estimated dynamic
timing is the estimate of the actual injection timing
that is calculated by the ECM.
Event Code – An event code may be activated in
order to indicate an abnormal engine operating
condition. These codes usually indicate a mechanical
problem instead of an electrical system problem.
Exhaust Back Pressure Regulator – The exhaust
back pressure regulator regulates the gas pressure in
the exhaust system. The valve can restrict the flow of
exhaust gases in order to increase the exhaust back
pressure. An increase in exhaust back pressure will
increase the temperature of the exhaust gases. The
increase in temperature will improve the process that
burns off the soot in the DPF.
Diagnostic Lamp – A diagnostic lamp is sometimes
called the check engine lamp. The diagnostic lamp is
used to warn the operator of the presence of an
active diagnostic code. The lamp may not be
included in all applications.
Diesel Exhaust Fluid (DEF) – DEF is a mixture of
urea and water that is injected into the exhaust
stream. The heat in the exhaust gas releases the
ammonia in the DEF. The ammonia reacts with the
oxides of nitrogen (NOx) in the SCR filter to produce
nitrogen and water vapor.
Diesel Oxidation Catalyst – The DOC is a device in
the exhaust system that oxidizes certain elements in
the exhaust gases. These elements can include
carbon monoxide (CO), hydrocarbons and the
soluble organic fractions (SOF) of particulate matter.
Diesel Particulate Filter – The Diesel Particulate
Filter filters particulates from the exhaust gases. The
hot exhaust gases burn off the particulates. This
process prevents the DPF from becoming blocked
with soot.
Digital Sensor Return – The common line (ground)
from the ECM is used as ground for the digital
sensors.
Digital Sensors – Digital sensors produce a pulse
width modulated signal. Digital sensors are supplied
with power from the ECM.
Digital Sensor Supply – The power supply for the
digital sensors is provided by the ECM.
Direct Current (DC) – Direct current is the type of
current that flows consistently in only one direction.
75
Engine Operation