Glossary - Perkins 1106D Troubleshooting Manual

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Diagnostic Codes
When the ECM detects an electronic system fault,
the ECM generates a diagnostic code. Also, the ECM
logs the diagnostic code in order to indicate the time
of the occurrence of the fault. The ECM also logs the
number of occurrences of the fault. Diagnostic codes
are provided in order to indicate that the ECM has
detected an electrical fault or an electronic fault with
the engine control system. In some cases, the engine
performance can be affected when the condition that
is causing the code exists.
If the operator indicates that a performance problem
occurs, the diagnostic code may indicate the cause of
the fault. Use the electronic service tool to access the
diagnostic codes. The fault should then be corrected.
Event Codes
Event Codes are used to indicate that the ECM has
detected an abnormal engine operating condition.
The ECM will log the occurrence of the event code.
This does not indicate an electrical malfunction
or an electronic malfunction. For example, if the
temperature of the coolant in the engine is higher
than the permitted limit, then the ECM will detect the
condition. The ECM will then log an event code for
the condition.
Programmable Parameters
Certain parameters that affect the engine operation
may be changed with electronic service tools.
The parameters are stored in the ECM and the
parameters are protected from unauthorized changes
by passwords. These parameters are System
Configuration Parameters.
System Configuration Parameters are set at the
factory. System Configuration Parameters affect
the emissions or the power ratings within the
engine. Factory passwords must be obtained and
used in order to change the System Configuration
Parameters.
Passwords
System Configuration Parameters are protected by
factory passwords. Factory passwords are calculated
on a computer system that is available only to
Perkins distributors. Since factory passwords contain
alphabetic characters, only an electronic service
tool may change System Configuration Parameters.
System Configuration Parameters affect the power
rating or the emissions.
Refer to Troubleshooting, "Programming Parameters"
and Troubleshooting, "Factory Passwords".

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 optimizes engine performance.
Alternating Current (AC) – Alternating current is an
electric current that reverses direction at a regular
interval that is reoccurring.
Before Top Center (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 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.
Code – Refer to "Diagnostic Code" or "Event Code".
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 Temperature 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.
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Troubleshooting Section
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