• The engine may run rough and produce white smoke while air is in
the fuel system. This is normal and should stop after a short period of
time.
Selective Catalytic Reduction (SCR) System
Your vehicle is equipped with a selective catalytic reduction (SCR)
system to help reduce emission levels of oxides of nitrogen from the
exhaust of the diesel engine. The system automatically injects diesel
exhaust fluid (DEF) into the exhaust system to enable proper SCR
function.
Importance of maintaining the DEF level
In order for the SCR system to operate properly, the DEF must be
maintained. Generally, the DEF tank should be filled before the DEF
gauge in the instrument cluster reached the first low level warning (refer
to DEF warning messages and vehicle operations).
The engine control unit will monitor the amount of fluid available in the
DEF tank. Failure to maintain an adequate amount of DEF in the system
will generate warning messages that appear in the instrument cluster
message center and, unless the DEF tank is refilled, will lead to a forced
reduction of engine operations.
DEF warning messages and vehicle operations
Your vehicle is equipped with a DEF gauge located in the instrument
cluster. The low level warning symbols (see chart) are illuminated if the
DEF gauge level drops below 0.5 gallon (1.9L) in the 5 gallon (19.0L)
DEF tank or 1 gallon (3.8L) in the 9 gallon (34.0L) DEF tank.
Upon filling the DEF tank after a low level warning, normal operation will
resume when the vehicle is restarted.
Maintenance and Specifications
201
2011 F-650/750 (f67)
Supplement, 2nd Printing
USA (fus)
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