Engine Diagnostics
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Self-Diagnostics
Perkins electronic engines can 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
A maximum of 6 codes can be stored at one time.
If 6 codes are already present, then the engine will
still react to another fault, but the fault will not be
logged by the ECM.
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.
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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.
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Fault Logging
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been rectified or the fault is no longer active.
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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: The power may be limited 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 for more information on the
relationship between these active diagnostic codes
and engine performance.
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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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SEBU9075-03
Operation Section
Engine Diagnostics
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