KENR9126 9
Troubleshooting Section
CAN Data Link (see also J1939 CAN Data Link) –
The CAN Data Lin
k is a serial communications
port that is used for communication with other
microprocessor-based devices.
Code – Refer to “Diagnostic Code” or “Event Code”.
Communicati
on Ada pter 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 sys
tem that has experienced a diagnostic
code.
Coolant Te
mperature Sensor – The coolant
temperature sensor detects the engine coolant
temperature for all normal operating conditions and
for engine
monitoring.
Data Link – The Data Link is a serial communication
port that
is used for communication with other devices
such as the electronic service tool.
Derate – C
ertain engine conditions will generate
event codes. Also, engine derates may be applied.
The map for the engine derate is programmed into
the ECM s
oftware. The engine derate can be one
or more of three types: reduction of rated power,
reduction of rated engine speed, and reduction of
rated ma
chine speed for OEM products.
Desired Engine Speed – The desired engine speed
is inpu
t to the electronic governor within the ECM.
The electro nic governor uses the signal from the
throttle position sensor, the engine speed/timing
senso
r, and other sensors in order to determine the
desired engine speed.
Diagn
ostic 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 us
ed to warn the operator of the presence of
an active diagnostic code. The lamp may not be
included in all applications.
Digital Sensor Return – The common line (ground)
from the ECM is used as ground for the digital
sen
sors.
Digital Sensors – Digital sensors produce a pulse
wi
dth modulated signal. Digital sensors are supplied
with power from the ECM.
Di
gital Sensor Supply – The power supply for the
digital sensors is provided by the ECM.
D
irect 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 th
at is used on Perkins engines. The
connectors are manufactured by Deutsch.
Duty Cycle – Re
fer to “Pulse Width Modulation”.
Electronic Engine Control – The electronic
engine contr
ol is a complete electronic system.
The electronic engine control monitors the engine
operation under all conditions. The electronic engine
control als
o 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 i
s 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 allows a computer (PC) to communicate with the
ECM.
Engine Monitoring – Engine Monitoring is the part
of the ele
ctronic engine control that monitors the
se
nsors
. This also warns the operator of detected
problems.
Engine Oil Pressure Sensor – The engine oil
pressure sensor measures engine oil pressure. The
sensor s
ends a signal to the ECM that is dependent
on the engine oil pressure.
Engine
Speed/Timing Sensor – An engine
speed/timing sensor is a hall effect switch that
provides a digital signal to the ECM. The ECM
inter
prets 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
senso
r is associated with the crankshaft and the
secondary sensor is associated with the camshaft.
Even
t Code – An event code may be activated
in order to indicate an abnormal engine operating
condition. These codes usually indicate a mechanical
prob
lem instead of an electrical system problem.
Failure Mode Identifier (FMI) – This identifier
ind
icates the type of failure that is associated with
the component. The FMI has been adopted from the
SAE practice of J1587 diagnostics. The FMI follows
the
parameter identifier (PID) in the descriptions of
the fault code. The descriptions of the FMIs are in
the following list.
0–The data is valid but the data is above the normal
operational range.
1–The data is valid but the data is below the normal
operational range.
2–The data is erratic, i ntermittent, or incorrect.
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