operators_manual

spin. When this function is in use, the ATC
W
arning Lamp blinks continuously.
Off-Road ABS Function Switch
(Optional)
Your vehicle may be equipped with a
separate switch to activate an Off-Road
ABS function. This function is NOT to be
used for On-Highway driving but is
intended to be used to improve stopping
performance in Off-Highway conditions
(e.g., loose gravel and mud). The Off-Road
ABS function is accomplished by allowing
a "wedge" of material to build-up in front of
momentarily locked wheels.
• 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 (40 km/h) 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
(40 km/h), the ABS controller operates in
the normal on-highway mode. At speeds
between 10 and 25 mph (16 and 40 km/h),
the ABS control software is modified to
allow short periods (0.25 seconds) of
locked-wheel cycles. At speeds below 10
mph (16 km/h), the ABS control software is
turned of
f 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.
DRIVING - Brakes
166 Y53-6110-1A1 (01/21)
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