operators_manual

WARNING!
While the off road mode can improve vehi-
cle control and shorten stopping distances,
some steering ability may be reduced on
certain surfaces resulting from the momen-
tarily sliding tires. Always operate your vehi-
cle at safe operating speeds. Failure to do
so may cause you to lose control of the ve-
hicle and could result in an accident or per-
sonal injury.
CAUTION
Never drive your vehicle on improved roads/
highways with the Off-Road ABS function
turned on. When you drive your vehicle onto
an improved road surface or highway, im-
mediately turn off the Off-Road ABS switch.
Failure to do so will cause the ABS system
to not function properly in an ABS event un-
der 25 mph and could result in an accident
or personal injury.
The ABS lamp flashes slowly during off-
road mode engagement. This is done to
alert you of a modification to the ABS
control software. At speeds above 25 mph,
the ABS controller operates in the normal
on-highway mode. At speeds between 10
and 25 mph, the ABS control software is
modified to allow short periods (0.25
seconds) of locked-wheel cycles. At
speeds below 10 mph, the ABS control
software is turned off to allow locked
wheels. When the Off-Road ABS function
is enabled, the Retarder Disable output is
turned off. That is, the engine retarders are
left to function without ABS intervention.
For additional information, see the Off-
Road ABS pamphlet in your vehicle’s glove
box.
Effectiveness and Limitations
ESC is designed and optimized for trucks
and for tractors that tow single trailers. If a
tractor equipped with ESC is used to power
multiple trailer combinations (known as
"doubles" or "triples") the effectiveness of
the ESC system may be greatly reduced.
WARNING!
Exercise extreme care when towing doubles
or triples with a vehicle equipped with Elec-
tronic Stability Program. Excessive speed
and aggressive maneuvers, such as sharp
turns, sudden steering inputs or abrupt lane
changes should be avoided because these
maneuvers could cause loss of vehicle con-
trol possibly resulting in an accident involv-
ing death or personal injury.
Additionally, the ESC stability system’s
effectiveness may be greatly reduced if:
• The load shifts due to improper
retention, accident damage or the
inherently mobile nature of some
loads (for example, hanging meat,
live animals or partially laden
tankers).
• The vehicle has an unusually high
or off-set center of gravity (CG).
• One side of the vehicle drops off the
pavement at an angle that is too
large to be counteracted by a
reduction in speed.
• The vehicle is used to haul double
or triple trailer combinations.
• If very rapidly winding steering
inputs are inputted at high speeds.
• There are mechanical problems with
suspension leveling of the tractor or
trailer resulting in uneven loads.
• The vehicle is maneuvering on a
high banked road creating either
additional side forces due to the
weight (mass) of the vehicle or a
DRIVING - Brakes
112 Y53-6096-1A1 (01/17)
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