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Engine Diagnostics
Self-Diagnostics
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 Perkins electronic service tools.
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.
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. A fault diagnostic code will remain
active until the problem is repaired. The diagnostic
code may be retrieved by using the electronic service
tool.
Diagnostic Flash Code
Retrieval
Use the following procedure to retrieve the flash
codes if the engine is equipped with a
"DIAGNOSTIC" lamp:
1. Move the keyswitch from the on/off two times within
3 seconds.
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2. The shutdown warning lamp will flash once.
3. A flashing YELLOW lamp indicates a 3-digit
diagnostic code for the engine. The sequence of
flashes represents the system diagnostic
message. Count the first sequence of flashes in
order to determine the first digit of the flash code.
After a two second pause, the second sequence of
flashes will identify the second digit of the flash
code. After the second pause, the third sequence
of flashes will identify the flash code.
4. After the diagnostic codes have been displayed,
the shutdown lamp will flash twice and the
indicator lamp will start to flash the logged
diagnostic codes.
5. After the logged diagnostic codes have been
displayed, the shutdown lamp will flash three times
in order to indication that the code sequences have
finished.
Note: If there are no diagnostic codes or logged
diagnostic codes, the system will flash the code 551.
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
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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. The following
logged faults cannot be cleared from the memory of
the ECM without using a factory password:
Overspeed, low engine oil pressure, high engine
coolant temperature, and aftertreatment codes.
Engine Operation with Active
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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.
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