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STARTING AND OPERATING 211
DIESEL EXHAUST FLUID
Your vehicle is equipped with a Selective
Catalytic Reduction (SCR) system to meet diesel
emissions standards required by the
Environmental Protection Agency.
The purpose of the SCR system is to reduce
levels of oxides of nitrogen (NO
x
) emitted from
engines that are harmful to our health and the
environment to a near-zero level. A small
quantity of Diesel Exhaust Fluid (DEF) is
injected into the exhaust upstream of a catalyst
where, when vaporized, converts smog-forming
NO
x
into harmless nitrogen (N
2
) and water
vapor (H
2
O), two natural components of the air
we breathe.
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° and 90°F
(-12° and 32°C), it will last a minimum of one
year.
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.
ADDING DIESEL EXHAUST FLUID
The Diesel Exhaust Fluid (DEF) gauge (located
on the instrument cluster) will display the level
of DEF remaining in the tank Ú page 109.
NOTE:
Driving conditions (altitude, vehicle speed,
load, etc.) will effect the amount of DEF that
is used in your vehicle.
Outside temperature can affect DEF
consumption. In cold conditions, 12°F
(-11°C) and below, the DEF gauge may take
longer to operate as intended. This is a
normal function of the system.
There is an electric heater inside the DEF
tank that automatically works when neces-
sary. And if the DEF supply does freeze, the
truck will operate normally until it thaws.
Diesel Exhaust Fluid (DEF) Fill Procedure
NOTE:
For the correct fluid type Ú page 475.
1. Remove cap from Diesel Exhaust Fluid
(DEF) tank which is located next to the
diesel fuel filler.
DEF Filler Cap And Fuel Fill
1 — Diesel Exhaust Fluid (DEF) Fill Location
2 — Diesel Fuel Fill Location
4
21_DT_OM_EN_USC_t.book Page 211
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