i05934639
Glossary of Electronic Control
Terms
Active Diagnostic Code – An active diagnostic code
alerts the operator or the service technician that an
electronic system malfunction is currently present.
Refer to the term “Diagnostic
Trouble Code” in this
glossary.
Aftertreatment – Aftertreatment is a system that is
used to remove pollutants from exhaust gases. The
system consists of a Diesel Oxidation Catalyst
(DOC), a Diesel Particulate Filter (DPF), and a
Selective Catalytic Reduction (SCR) system.
Air-To-Air Aftercooler – An air-to-air aftercooler is a
device that is used on turbocharged engines in order
to cool inlet air that has undergone compression. The
inlet air is cooled after the inlet air passes through the
turbocharger. The inlet air is passed through an
aftercooler (heat exchanger) that uses ambient air for
cooling. The inlet air that has been cooled advances
to the inlet manifold.
Alternating Current (AC) – Alternating current is an
electric current that reverses direction at a regular
interval that is reoccurring.
Ammonia Oxidizing (AMOX) catalyst – The AMOX
catalyst removes any residual ammonia from the
exhaust gas stream after completion of the Selective
Catalytic Reduction (SCR) process.
Before Top Center (BTC) – BTC is the 180 degrees
of crankshaft rotation before the piston reaches the
top center position in the normal direction of rotation.
Inlet Manifold Pressure – The difference between
the turbocharger outlet pressure and atmospheric
pressure is commonly referred to as inlet manifold
pressure. The sensor for the inlet manifold air
pressure measures the amount of boost.
Breakout Harness – The breakout harness is a test
harness that is designed to connect into the engine
harness. This connection allows a normal circuit
operation and the connection simultaneously
provides a Breakout T in order to measure the
signals.
Bypass Circuit – A bypass circuit is a circuit that is
used as a substitute circuit for an existing circuit. A
bypass circuit is typically used as a test circuit.
CAN Data Link (see also J1939 CAN Data Link) –
The CAN Data Link is a serial communications port
that is used for communication with other
microprocessor-based devices.
Clean Emissions Module (CEM) – Refer to
“Aftertreatment” .
Code – Refer to “Diagnostic Trouble Code” .
Cold Mode – Cold mode is a mode for cold starting
and for cold engine operation. This mode is used for
engine protection, reduced smoke emissions, and
faster warm-up time.
Communication Adapter Tool – The
communication adapter provides a communication
link between the ECM and the Electronic Service
Tool.
Coolant Temperature Sensor – The coolant
temperature sensor detects the engine coolant
temperature for all normal operating conditions and
for engine monitoring.
Customer Specified Parameters – A customer
specified parameter is a parameter that can be
changed in the ECM with the Electronic Service Tool.
A customer specified parameter's value is set by the
customer. These parameters are protected by
customer passwords.
Data Link – The Data Link is a serial communication
port that is used for communication with other
microprocessor-based devices.
Derate – Certain engine conditions will generate
event codes. Also, engine derates may be applied.
The map for the engine derate is programmed into
the ECM software. The derate can be one or more of
three types: reduction of rated power, reduction of
rated engine speed and reduction of rated machine
speed for OEM products.
Desired Engine Speed – The desired engine speed
is input to the electronic governor within the ECM.
The electronic governor uses the signal from the
throttle position sensor, the engine speed/timing
sensor, and other sensors in order to determine the
desired engine speed.
Diagnostic Trouble Code – A diagnostic trouble
code is sometimes referred to as a fault code. These
codes indicate an electronic system malfunction.
Diagnostic Lamp – A diagnostic lamp is sometimes
called the check engine light. The diagnostic lamp is
used to warn the operator of the presence of an
active diagnostic code. The diagnostic lamps are red
and orange. 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.
74 UENR4490-01
Engine Operation
This document has been printed from SPI2. NOT FOR RESALE
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