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SEBU9068-03
Engine Diagnostics
Self-Diagnostics
Perkins electronic engines have the capability to
perform a self-diagnostics test. When the system
detects an active problem, a diagnostic lamp is
activated. Diagnostic codes will be stored in
permanent memory in the Electronic Control Module
(ECM). The diagnostic codes can be retrieved by
using the electronic service tool. Refer to
Troubleshooting , "Electronic Service Tools" for
further information.
Some installations have electronic displays that
provide direct readouts of the engine diagnostic
codes. Refer to the manual that is provided by the
OEM for more information on retrieving engine
diagnostic codes. Alternatively refer to
Troubleshooting , "Indicator Lamps" for further
information.
Active codes represent problems that currently exist.
These problems should be investigated first.
Logged codes represent the following items:
• Intermittent problems
• Recorded events
• Performance history
The problems may have been repaired since the
logging of the code. These codes do not indicate that
a repair is needed. The codes are guides or signals
when a situation exists. Codes may be helpful to
troubleshoot problems.
When the problems have been corrected, the
corresponding logged fault codes should be cleared.
Diagnostic Lamp
A diagnostic lamp is used to indicate the existence of
an active fault. Refer to Troubleshooting , "Indicator
Lamps" for more information. A fault diagnostic code
will remain active until the problem is repaired. The
diagnostic code may be retrieved by using the
electronic service tool. Refer to Troubleshooting ,
"Electronic Service Tools" for more information.
Fault Logging
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The system provides the capability of Fault Logging.
When the Electronic Control Module (ECM)
generates an active diagnostic code, the code will be
logged in the memory of the ECM. The codes that
have been logged by the ECM can be identified by
the electronic service tool. The active codes that
have been logged will be cleared when the fault has
been rectified or the fault is no longer active.
Engine Operation with Active
Diagnostic Codes
If a diagnostic lamp illuminates during normal engine
operation, the system has identified a situation that is
not within the specification. Use electronic service
tools to check the active diagnostic codes.
Note: If the customer has selected "DERATE" and if
there is a low oil pressure condition, the Electronic
Control Module (ECM) will limit the engine power
until the problem is corrected. If the oil pressure is
within the normal range, the engine may be operated
at the rated speed and load. However, maintenance
should be performed as soon as possible.
The active diagnostic code should be investigated.
The cause of the problem should be corrected as
soon as possible. If the cause of the active diagnostic
code is repaired and there is only one active
diagnostic code, the diagnostic lamp will turn off.
Operation of the engine and performance of the
engine can be limited as a result of the active
diagnostic code that is generated. Acceleration rates
may be significantly slower. Refer to the
Troubleshooting Guide for more information on the
relationship between these active diagnostic codes
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and engine performance.
Engine Operation with
Intermittent Diagnostic Codes
If a diagnostic lamp illuminates during normal engine
operation and the diagnostic lamp shuts off, an
intermittent fault may have occurred. If a fault has
occurred, the fault will be logged into the memory of
the Electronic Control Module (ECM).
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Operation Section
Engine Diagnostics
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