operators_manual

• Changes the ABS control limits to
allow for a more aggressive ABS
function while off-road.
• Improves vehicle control and helps
reduce stopping distances in off-
road conditions or on poor traction
surfaces such as loose gravel,
sand, and dirt.
• Allows retarders to function
independently of the ABS function.
• If your vehicle does not have an
engine retarder, the Off- Road ABS
switch will function the same.
WARNING
While the off road mode can improve
vehicle control and shorten stopping
distances, some steering ability may
be reduced on certain surfaces result-
ing from the momentarily sliding tires.
Always operate your vehicle at safe
operating speeds. Failure to do so
may cause you to lose control of the
vehicle and could result in an accident
or personal 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, immediately
turn off the Off-Road ABS switch. Fail-
ure to do so will cause the ABS sys-
tem to not function properly in an ABS
event under 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 equip-
ped with Electronic Stability Program.
Excessive speed and aggressive ma-
neuvers, such as sharp turns, sudden
steering inputs or abrupt lane changes
should be avoided because these ma-
neuvers could cause loss of vehicle
control possibly resulting in an acci-
dent involving 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,
DRIVING - Brakes
Y53-6047-2HEN (03/18) 153
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