TM 5-3805-291-23-1
HOW TO USE ON-BOARD DIAGNOSTICS - CONTINUED
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DIAGNOSTIC CODES - CONTINUED
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(c) Screen Layout. The Logged Diagnostic Codes display area has five columns: Code, Description, Occ.,
First, and Last. The code numbers that appear are used to identify the diagnostic codes. The Descrip-
tion column informs you of the problem that is occurring. The Occ. (occurrences) column informs you
of the number of times that the problem occurred. The columns marked First and Last indicate the first
and last ECM hour that the problem occurred.
The list of codes is grouped according to the ECM from which they are retrieved, and they appear
ordered chronologically by the most recent ECM hour of last occurrence. The ECM names appear as
subtitles in the list. On the same line as the ECM subtitle, the number of ECM diagnostic clock hours
is displayed. These hours represent the time that the ECM has been connected and running.
When the "Include All ECMs" check box is checked, logged codes from all available ECMs are
retrieved and displayed. When there is a single ECM on the data link, this check box is disabled. The
push-buttons available in the Logged Diagnostic Codes screen are: Clear, More Info, and Print.
(3)
This information is a valuable indicator for troubleshooting intermittent problems. Any logged diagnostic
codes will automatically be deleted if no additional occurrences are recorded in 150 hours. Some diagnos-
tic codes may be easily triggered. Some diagnostic codes may log occurrences that did not result in com-
plaints. The most likely cause of an intermittent problem is a faulty connection or damaged wiring. The
next likely cause is a component failure. The least likely cause is ECM failure. Diagnostic codes that are
logged repeatedly may indicate a problem that needs special investigation.
2.
Event Codes.
a.
Active Event Codes.
(1)
Purpose. The Active Event Codes function provides information about events currently occurring. These
codes are similar to the active diagnostic codes, except that the event represents the symptom of an opera-
tional problem. These codes indicate to the manager or technician how the machine or equipment is being
operated.
Accessing. To run the Active Event Codes function: select Events from the Diagnostic menu, and then
(2)
select Active Event Codes from the sub-menu. You may have to customize the tool bar to view active
event codes.
Screen Layout. The Active Event Codes display area has two columns: Code and Description. The code
(3)
numbers that appear are used to identify the events. The Description column informs you of the event that
is occurring.
A warning category indicator immediately follows the code number and is in parentheses. It is a number
ranging from 1 to 3, where 3 is the most severe, and it indicates the severity of the associated code number.
The warning category provides an indication of the type of behavior and/or actions which must be taken by
the operator, or by the control system for some engine applications, to address the severity of the associ-
ated situation.
The list of codes is grouped according to the ECM from which they are retrieved. They appear in chrono-
logical order by the most recent ECM hour of last occurrence. The ECM names appear as subtitles in the
list. If there is more than one ECM connected, the subtitles are arranged alphabetically.
When the "Include All ECMs" check box is checked, active codes from all available ECMs are retrieved
and displayed. When there is a single ECM on the data link, this check box is disabled. The push-button
available in the Active Event Codes screen is: Print.
b.
Logged Event Codes.
Purpose. The Logged Event Codes function provides a list of event codes logged by the ECM. These codes
(1)
are similar to the logged diagnostic codes, except that the event represents the symptom of an operational
problem. These codes indicate to the manager or technician how the machine/equipment is being operated.
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