SEBU8337 29
Operation Section
Engine Diagnostics
Engine Diagnostics
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Self-D iagn ost ics
The electronic control module has some
self-diagnostic ability. When an electronic problem
with an input or an output is detected, a diagnostic
code is generated. This indicates the specific problem
with the circuitry.
A diagnostic code which represents a problem that
currently exists is called an active code.
A diagnostic code that is stored in memory is called
a logged code. Always service active codes prior to
servicing logged codes. Logged codes may indicate
intermittent problems.
Logged codes may not indicate that a repair is
needed. The problems may have been repaired since
the logging of the code. Logged codes may be helpful
to troubleshoot intermittent problems.
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Diagnostic Lamp
The“DIAGNOSTIC”lampisusedtoindicatethe
existenceofanactivefault.
A fault diagnostic code will remain active until the
problem is repaired.
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Faul t 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 Perkins
electronic service tool can retrieve codes that have
been logged. The codes that have been logged can
be cleared with the Perkins electronic service tool.
The codes that have been logged in the memory
of the ECM will be automatically cleared from the
memory after 100 hours.
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Engine O peration with Active
Diagnostic Co
des
If a diagnostic lamp illuminates during normal engine
operation, the system has identified a situation that is
not within the
specification. Use the electronic service
tool to check the active diagnostic codes.
The active d i
agnostic 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 repai
red 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 signi
ficantly slower and power outputs may
be automatically reduced. Refer to T roubleshooting
, “Troubleshooting with a Diagnostic Code” for more
informati
on on the relationship between each active
diagnostic code and the possible effect on engine
performance.
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Engine Operation with
Intermittent Diagnostic Codes
If a diagn
ostic lamp illuminates during normal engine
operation and the diagnostic lamp shuts OFF, an
intermittent fault may have occurred. If a fault has
occurre
d, the fault will be logged into the memory of
the Electronic Control Module (ECM).
In most c
ases, it is not necessary to stop the engine
because of an intermittent code. However, the
operator should retrieve the logged fault codes
and the o
perator should reference the appropriate
information in order to identify the nature of the fault.
The operator should log any observation that could
have ca
used the lamp to light.
•
Low power
•
Limits of the engine speed
•
Excess
ive smoke, etc
This information can be useful to help troubleshoot
the sit
uation.Theinformationcanalsobeusedfor
future reference. For more information on diagnostic
codes, refer to the Troubleshooting guide for this
engine
.
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