KENR6908 7
Troubleshooting Section
i03034602
Glossary
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 Code” in this glossary.
Adaptive Trim – This is a software process that is
performed in the Electronic Control Module (ECM)
that optimize
s engine performance.
Alternating Current (AC) – Alternating c urrent is an
electric cur
rent that reverses direction at a regular
interval that is reoccurring.
Before Top Ce
nter (BTC) – BTC is the 180 degrees
of crankshaft rotation before the piston reaches the
top dead center position in the normal direction of
rotation.
Breakout Harness – A breakout harness is a
test harnes
s that is designed to connect into the
engine harness. This connection allows a normal
circuit operation and the connection simultaneously
provides a B
reakout T in order to measure the
signals.
Bypass Cir
cuit – 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.
Camshaft Position Sensor – This sensor
determines the position of the camshaft during
engine op
eration. If the camshaft position sensor
fails during engine operation, the crankshaft position
sensor is used to provide the signal.
CAN Data Link (see also J1939 CAN Data Link) –
The CAN Data Link is a communication link that is
used for c
ommunication with other microprocessor
based devices.
Code – Ref
er to “Diagnostic Code” or “Event Code”.
Communication Adapter – The communication
adapter p
rovides a communication link between the
ECM and the electronic service tool.
Compone
nt Identifier (CID) – The CID is a number
that identifies the specific component of the electronic
control system that has experienced a diagnostic
code.
Coolant Temperature Sensor – The coolant
tempera
ture sensor detects the engine coolant
temperature for all normal operating conditions and
for engine monitoring.
Crankshaft Position Sensor – This sensor
determines the
position of the crankshaft during
engine operation. If the crankshaft position sensor
fails during engine operation, the camshaft position
sensor is used
to provide the signal.
Data Link – The Data Link is a serial communication
link that is u
sed for communication with other devices
such as the electronic service tool.
Derate – Cert
ain engine conditions will generate
event codes. Also, engine derates may be applied.
The map for the engine derate is programmed into
the ECM softw
are. 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 OE
M products.
Desired Engine Speed – The desired engine speed
is input to t
he electronic governor within the ECM.
In order to determine the desired engine speed, the
electronic governor uses a digital signal, an analog
signal, a P
WM signal or a J1939 signal.
Diagnostic Code – A diagnostic code is sometimes
referred t
o as a fault code. These codes indicate an
electronic system malfunction.
Diagnosti
cLamp –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 lamp may not be
included in all applications.
Digital S
ensor Return –
The common line (ground)
for the digital sensor is provided by the ECM.
Digital S
ensors – Digital sensors produce a pulse
width modulated signal. Digital sensors are supplied
with power from the ECM.
Digital S ensor 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.
DT, DT Connector, or Deutsch DT – This is a type
of connector that is used on Perkins engines. The
connect
ors are manufactured by Deutsch.
Duty Cycle – Refer to “Pulse Width Modulation”.
Electronic Engine Control – The electronic
engine control is a complete electronic system.
The ele
ctronic engine control monitors the engine
operation under all conditions. The electronic engine
control also controls the engine operation under all
condit
ions.
This document has been printed from SPI². Not for Resale
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