TM 5-3805-291-23-1
HOW TO USE ON-BOARD DIAGNOSTICS - CONTINUED
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DIAGNOSTIC CODES
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N OT E
For a complete list of diagnostic codes and how to find their diagnostic procedures, refer to Troubleshooting
1.
Fault Codes.
Active Diagnostic Codes. An active diagnostic fault code represents a problem with an electronic control system.
a.
Correct the problem as soon as possible.
(1)
Before performing a procedure, always check all fuses and circuit breakers (TM 5-3805-291-10). Repair
the cause of any tripped circuit breaker.
(2)
A screen is provided in ET for displaying active diagnostic codes. Active diagnostic codes shall include a
component identifier (CID), a failure mode identifier (FMI), and a text description of the problem.
(a) Purpose. The Active Diagnostic Codes function provides information to warn the vehicle operator of a
potential problem and indicates to the service technician the nature of the problem. The codes that are
diagnosed in this screen are active (occurring as you view them).
(b) Accessing. To run the Active Diagnostic Codes function, select Active Diagnostic Codes from the
Diagnostic menu.
(c) Screen Layout. ET displays up to four status flag indicators across the top of the screen. These flags
are used to notify you of currently active conditions, such as low oil pressure, engine overspeed, etc.
When a warning condition exists, it is described in the appropriate flag indicator area. The name of the
active ECM is displayed above the flags.
The Active Diagnostic Codes display area has two columns, Code and Description. The code numbers
that appear are used to identify the diagnostic codes. The Description column informs you of the prob-
lem that is occurring. The list of codes is grouped according to the ECM from which they are
retrieved. 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-buttons available in the Active Diagnostic Codes screen are: More Info and Print.
b.
Logged Diagnostic Codes. When an ECM generates a diagnostic code, it logs the code in permanent memory,
using an internal diagnostic clock.
(1)
The ECM records the hour of first occurrence, the hour of last occurrence, and the total number of occur-
rences using the ECM's internal diagnostic clock.
(2)
A screen is provided in ET for displaying logged diagnostic codes. Logged diagnostic information shall
include a component identifier (CID), a failure mode identifier (FMI), and a text description of problem.
(a) Purpose. The Logged Diagnostic Codes function provides a list of diagnostic codes logged by the
ECM. These codes are similar to the active diagnostic codes except they are logged over time.
(b) Accessing. To run the Logged Diagnostic Codes function, select Logged Diagnostic Codes from the
Diagnostics menu.
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