close to odorless. (It may have a slightly pungent
odor similar to ammonia.) It is nontoxic, nonflam-
mable and biodegradable. It is mildly corrosive to
aluminum, but it will not affect the strength or struc-
ture of the aluminum. A white powder may be notice-
able around components that the DEF comes in con-
tact with. Around 12°F (-11°C) DEF freezes to slush,
but is not damaged or destroyed if frozen, and is fully
usable when thawed. The DEF supply lines are elec-
trically heated and are purged when the engine is
shut down. The DEF in the tank is allowed to freeze
while the vehicle is non-operational. At start up, nor-
mal operation of the vehicle is not inhibited if the
DEF is frozen; an immersion heater with engine cool-
ant flowing through it will warm the DEF once the
engine is running, to allow the SCR system to oper-
ate.
DEF Tank
EPA10-compliant vehicles are equipped with a DEF
tank located on the driver’s side of the vehicle, usu-
ally behind the battery box, or an optional location
forward of the fuel tank for day cab configurations.
See
Fig. 7.8
, and
Fig. 7.9
. The DEF tank has a 19
mm filler neck inlet that prevents the hose from a
diesel outlet from being inserted, and has a blue cap
for easy identification.
DEF consumption will vary depending on ambient
conditions and vehicle application.
f080147
EXHAUST AFTERTREATMENT SYSTEM INFORMATION
Switch.
Level 1
Level 3
Level 2
Level 4
Filter Regeneration
Recommended
Filter is reaching
Bring vehicle to
highway speeds to
Filter Regeneration
Necessary
Filter is now
reaching maximum
capacity.
To avoid engine
derate bring vehicle
Parked Regeneration
Required − Engine
Derate
Filter has reached
maximum capacity.
Vehicle must be
parked and a Parked
Parked Regeneration Required −
Engine Shut Down
Filter has exceeded
maximum capacity
Vehicle must be parked and a
Parked Regeneration or Service
(Solid)
(Flashing)
(Flashing)
CHECK
CHECK
(Flashing)
INDICATOR
LAMP(S)
Indicator Lamp
Message(s)
Diesel Particulate
Filter Condition
Required Action
capacity.
.
STOP
See Engine Operator’s Manual for complete Regeneration Instructions.
allow for an Automatic
Regeneration or
perform a Parked
Regeneration.
to highway speeds
to allow for an
Automatic
Regeneration or
perform a Parked
Regeneration as
soon as possible.
Regeneration must
be performed −
engine will begin
derate.
Regeneration must be performed.
Check engine operator’s manual
for details −engine will shut down.
For a driver performed Parked Regeneration, vehicle must be equipped with a dash mounted Regeneration Switch.
06/29/2009
24−01583−000B
WARNING
HEST (High Exhaust
System Temperature)
Exhaust Components
and exhaust gas are
at high temperature.
When stationary, keep
away from people and
flammable materials
or vapors.
A regeneration is in
progress.
Flashing
Solid
Fig. 7.7, Exhaust-Aftertreatment Warnings
07/24/2009
f470542
1
2
1.
Batteries
2.
DEF Tank
Fig. 7.8, DEF Tank Located Behind the Battery Box
Engines
7.6