freightliner 122SD - Def Tank; Fuel;Def Gauge

Freezing Conditions
DEF freezes to slush at around 12°F (-11°C). It is not
damaged or destroyed if frozen, and is fully usable
when thawed. The DEF in the tank is allowed to
freeze while a vehicle is non-operational. At start-up,
normal operation of the vehicle is not inhibited if the
DEF is frozen; an immersion heater with engine cool-
ant flowing through it warms the DEF once the en-
gine is running, allowing the SCR system to operate.
Pre-2013 DEF supply lines are electrically-heated
and are purged when the engine is shut down; com-
plete purging of the DEF lines requires approximately
five minutes after the engine is shut down.
DEF supply lines with engine model year 2013 and
newer are designed to survive freezing conditions
while containing DEF, so purging is not required.
DEF Tank
Engines that are compliant with EPA10 and newer
regulations are equipped with a DEF tank located on
the driver’s side of the vehicle behind the battery box
or forward of the fuel tank. See
Fig. 11.8 and
Fig. 11.9. 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.
Fuel/DEF Gauge
The diesel fuel and DEF levels are measured in a
dual-purpose gauge. See Fig. 11.10.
Fuel level is indicated at the top of the gauge. Below
the fuel level, a low fuel warning lamp illuminates
amber when the fuel level drops below 1/8th of the
capacity.
The lower portion of the gauge has a DEF warning
lamp that illuminates amber when the DEF tank is
DPF Regen Needed
Hot Exhaust
DEF Refill Needed
Diesel Particulate Filter (DPF)
regeneration is needed.
If flashing, regenerate as soon as
possible. Engine derate possible.
Hot exhaust can cause fire.
Keep flammables and people away
from exhaust.
Diesel Exhaust Fluid (DEF) level is
low. Engine derate likely.
Refill tank with certified DEF.
See operator’s manual for complete instructions.
24−01656−000
IMPORTANT
DEF
11/30/2010 f080161
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Fig. 11.3, Warning Lamp Decal, Sun Visor
Emissions and Fuel Efficiency
11.4