Aftertreatment Operation
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Selective Catalytic Reduction
Warning System
The Selective Catalytic Reduction (SCR) system is a
system used to reduce Nitrogen Oxide (NOx)
emissions from the engine. Diesel Exhaust Fluid
(DEF) is pumped from the DEF tank and is sprayed
into the exhaust stream. The DEF reacts with the
SCR catalyst to reduce NOx and leaves a nitrogen
and water vapor.
The engine and emissions control system shall be
operated, used, and maintained in accordance with
the instructions provided to the end user to maintain
the emissions performance of the engine within the
requirements applicable to the category of the
engine. No deliberate tampering with, or misuse of
the engine emissions control system should take
place. In particular regarding deactivating, or not
maintaining the SCR system.
NOTICE
Stopping the engine immediately after the engine has
been working under load can result in overheating of
SCR components.
Refer to the Operation and Maintenance Manual,
“Engine Stopping” procedure to allow the engine to
cool and to prevent excessive temperatures in the
turbocharger housing and the DEF injector.
NOTICE
Allow at least 2 minutes after shutting down the en-
gine before you turn the battery disconnect switch to
OFF. Disconnecting the battery power too soon will
prevent purging of the DEF lines after the engine is
shutdown.
Note: For information on DEF, refer to this Operation
and Maintenance Manual, “Fluid Recommendations”.
Warning Strategy
The Electronic Control Module (ECM) will be enabled
with a world-wide warning strategy.
Warning Indicators
The warning indicators consist of a level gauge for
the DEF, a low-level lamp for the DEF, an emission
malfunction lamp, and the application stop lamp.
Illustration 47 g03069862
(1) DEF gauge
(A) Low-level warning lamp
Illustration 48 g02852336
Emission malfunction lamp
Warning Levels
The SCR has three levels of warning. The time that
the system will stay at each warning level depends
on the fault detected and the type of software
enabled.
Any warning should be investigated immediately.
Contact your Perkins dealer or your Perkins
Distributor if further assistance is required. The
system is equipped with an override option. If the
override option has been used and the fault still
exists, the engine will be locked in de-rate or
shutdown mode.
Definitions
• Self-correct Fault condition no longer exists. An
active fault code will no longer be active.
• Notification Action taken by the system to alert
the operator of pending Inducement.
• Inducement Engine derates, vehicle speed
limits, or other actions intended to prompt the
operator to repair or maintain the emission control
system.
M0092609-05 65
Operation Section
Aftertreatment Operation
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