RAM 3500 2012 User Manual page 73

System Overview
• This vehicle is equipped with a Diesel Exhaust Fluid (DEF) injection system
and a Selective Catalytic Reduction (SCR) catalyst to meet the emission
requirements.
• The DEF injection system consists of the following components:
• DEF tank
• DEF pump
• DEF injector
• DEF control module
• NOx sensors
• Temperature sensors
• SCR catalyst
• The DEF injection system and SCR catalyst enable the achievement of diesel
emissions requirements; while maintaining outstanding fuel economy,
drivability, torque and power ratings.
NOTE: The DEF pump will run for a period of time after engine shutdown to purge
the DEF system. This is normal operation.
Diesel Exhaust Fluid Storage
• Diesel Exhaust Fluid (DEF) is considered a very stable product with a long
shelf life. If DEF is kept in temperatures between 10° to 90°F (-12° to 32°C), it
will last a minimum of one year.
• DEF is subject to freezing at the lowest temperatures. For example, DEF may
freeze at temperatures at or below 12° F (-11° C). The system has been
designed to operate in this environment.
NOTE: When working with DEF, it is important to know that:
• Any containers or parts that come into contact with DEF must be DEF
compatible (plastic or stainless steel). Copper, brass, aluminum, iron or
non-stainless steel should be avoided as they are subject to corrosion by DEF.
• If DEF is spilled, it should be wiped up completely.
DIESEL
71