Engine Diagnostics
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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been rectified or the fault is no longer active.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).
In most cases, stopping the engine will not be
necessary because of an intermittent code. However,
the operator should retrieve the logged fault codes
and the operator should reference the appropriate
information. in order to identify the nature of the
event. The operator should log any observation that
could have caused the lamp to light.
• Low power
• Limits of the engine speed
• Engine vibration or engine noise
This information can be useful to help troubleshoot
the situation. The information can also be used for
future reference. For more information on diagnostic
codes, refer to the Troubleshooting Guide for this
engine.
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Configuration Parameters
System configuration parameters affect the
emissions of the engine or the power of the engine.
System configuration parameters are programmed at
the factory. Normally, system configuration
parameters would never change through the life of
the engine. System configuration parameters must
be reprogrammed if an Electronic Control Module
(ECM) is replaced. System configuration parameters
are not reprogrammed if the ECM software is
changed.
For more information, refer to Troubleshooting,
“System Configuration Parameters”.
46 M0094137-02
Operation Section
Engine Diagnostics
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