Glossary - Perkins 1104E Series Troubleshooting Manual

RENR2696-01

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.
Alternating Current (AC) – Alternating current is an
electric current that reverses direction at a regular
interval that is reoccurring.
Before Top Dead Center (BTC) – BTDC is the
180 degrees of crankshaft rotation before the piston
reaches the top dead center position in the normal
direction of rotation.
Boost Pressure (Engines that are turbocharged) –
The difference between the turbocharger outlet
pressure and atmospheric pressure is commonly
referred to as boost pressure. The sensor for the
intake 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 – The CAN Data Link is a serial
communications port that is used for communication
with other microprocessor based devices. In this
application, the CAN Data Link connects the ECM to
the Electronic Fuel Injection Pump.
Code – Refer to "Diagnostic Code" or "Event Code".
Cold Mode – Cold mode is a mode for cold starting
and for cold engine operation that includes timing
that is retarded and low idle that is raised. 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.
Component Identifier (CID) – The CID is a number
that identifies the specific component of the electronic
control system that has experienced a diagnostic
code.
Coolant Level Sensor – The coolant level sensor
i01798101
detects the absence or presence of coolant at the
probe. The sensor then sends a signal to the ECM.
Coolant Temperature Sensor – The coolant
temperature sensor detects the engine coolant
temperature for cold mode operation and for Engine
Monitoring.
Data Link – The Data Link is a serial communication
port that is used for communication with other
microprocessor based devices.
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 Code – A diagnostic 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.
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 +8 VDC from the ECM.
Digital Sensor Supply – The +8 VDC supply from
the ECM is used in order to power the digital sensors.
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
connectors are manufactured by Deutsch.
Duty Cycle – Refer to "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 Service Tool – The electronic service
tool allows a computer (PC) to communicate with the
ECM.
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Troubleshooting Section