freightliner M2 Plus 2023 Manual page 162

Emissions
09/25/2006
Fig. 13.4, Malfunction Indicator Lamp (MIL)
09/25/2006
Fig. 13.5, DPF Status Lamp
09/09/2016
Fig. 13.6, HEST Lamp
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particulate filter part number and serial number.
Diesel Exhaust Fluid and Tank
Diesel Exhaust Fluid
Diesel exhaust fluid (DEF) is used in the ATS to
lower NOx in the exhaust stream. DEF is colorless
and close to odorless (it may have a slightly pungent
odor similar to ammonia). It is nontoxic,
nonflammable, and biodegradable. It is mildly
corrosive to aluminum, but does not affect the
strength or structure of the aluminum.
13.7
White crystals may be noticeable around
components that come into contact with DEF. The
crystals are easily removed with water.
DEF consumption varies depending on ambient
conditions and vehicle application.
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,
f610814a
normal operation of the vehicle is not inhibited if the
DEF is frozen; an immersion heater with engine
coolant flowing through it warms the DEF once the
engine is running, allowing the SCR system to
operate.
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. 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.
f610815a
Fuel/DEF Gauge
The diesel fuel and DEF levels are measured in a
dual-purpose gauge. Below the gauge, a low fuel
warning lamp illuminates amber when the fuel level
drops below 1/8th of the capacity. See
A DEF warning lamp illuminates amber when the
DEF tank is near empty.
DEF Warnings and Engine Limits
f611430a
IMPORTANT: Ignoring the DEF low level
warnings results in limited engine power, with
the application of a 5 mph (8 km/h) speed limit.
DEF Level Low—Initial Warning
When the DEF level is low, the DEF warning lamp
illuminates solid amber, and the driver display screen
presents an alert. See
in order to cancel the warning sequence.
DEF Empty
When the DEF level reads empty, the following
lamps and messages notify the driver.
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The DEF warning lamp flashes amber.
Fig. 13.7.
Fig. 13.8. Refill the DEF tank