Engine Diagnostics - Perkins 1204F-E44TA Operation And Maintenance Manual

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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 "DIAGNOSTIC" lamp or an electronic service
tool to determine the diagnostic flash code.
Use the following procedure to retrieve the flash
codes if the engine is equipped with a
"DIAGNOSTIC" lamp:
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1. Move the keyswitch from the on/off two times
within 3 seconds.
A flashing YELLOW lamp indicates a 3-digit 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.
For more information refer to Troubleshooting.
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. 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
Diagnostic Codes
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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
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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.
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Operation Section
Engine Diagnostics
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