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Exhaust Treatment DGC-2020ES
• DEF LOW SEVERE: This pre-alarm displays when SPN 5245 has a value of 4, indicating that the DEF
tank level is severely low or empty. The exact DEF levels which constitute a severely low DEF condition
vary among manufacturers. When this occurs and is not remedied, the engine ECU may enter a mode
of inducement not to operate the engine where some of the conditions in the pre-alarms descriptions
below may occur.
• DEF WARNING: This pre-alarm displays when SPN 5246 has a value of 1. This is the lowest level of
warning which indicates the EATS is not functioning properly or DEF quality or level is insufficient for
proper operation.
• DEF WARNING LVL2: This pre-alarm displays when SPN 5246 has a value of 2. This is a higher level
of warning which indicates the EATS is not functioning properly or DEF quality or level is insufficient for
proper operation. If the problem causing this warning is not corrected, the system will eventually enter
the DEF inducement states. In these states, the engine power or operating speed may be derated
depending on the engine manufacturer and engine application.
• DEF INDUCEMENT: This pre-alarm displays when SPN 5246 has a value of 3, indicating the first level
of inducement. The engine power or operating speed may be derated at this level of inducement
depending on engine manufacturer and engine application. This is the lowest level of inducement and
is caused by either the EATS not functioning properly or insufficient DEF quality or level for proper
operation.
• DEF PRESEVERE INDUCEMENT: This pre-alarm displays when SPN 5246 has a value of 4, indicating
the Pre-Severe Inducement level of inducement. This indicates that the engine has entered the second
highest level of inducement not to operate. This is caused by either the EATS not functioning properly
or insufficient DEF quality or level for proper operation. The engine power or operating speed may be
derated at this level of inducement depending on engine manufacturer and engine application. The
ECU will allow the engine to run for a limited time in this condition after which the engine will enter the
severe inducement state.
• DEF SEVERE INDUCEMENT: This pre-alarm displays when SPN 5246 has a value of
5, indicating the Severe Inducement level of inducement. This is caused by either the
EATS not functioning properly or insufficient DEF quality or level for proper operation. In
this condition, the engine may either operate with reduced power or RPM or be shut
down depending on manufacturer or engine application. The engine will remain at this
level of inducement until the problem causing the inducement is resolved.
• DEF INDUCEMENT OVERRIDE: This pre-alarm displays when SPN 5246 has a value of 6, indicating
the Temporary Override of inducement. This indicates DEF inducement is temporarily overridden. The
engine may operate with reduced power, or for a limited time, after which time it may re-enter the
SEVERE INDUCEMENT state.
Exhaust System Status Annunciation
When an exhaust system condition requires annunciation, the DGC-2020ES displays the exhaust system
information across the bottom of the front panel screen. The parameters and symbols in the Exhaust
System Status Display are listed below. The symbol images below are the actual bit-mapped images that
are viewed on the front panel screen of the DGC-2020ES.
DEF Tank Level – The DEF Tank Level is the level of Diesel Exhaust Fluid (DEF) in the DEF Tank. When
the DEF Level is getting low and DEF related conditions require annunciation, the caption of the DEF
Tank level will change from “DEF” to the DEF symbol. Details of the DEF symbol are described below.
DEF Symbol – When the symbol is on solid, it indicates that DEF is low or there is an issue
with the Selective Catalytic Reduction (SCR) system. When it is flashing, it indicates the DEF
level is critically low or there is a critical issue with the SCR system.
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