User Manual

A Real World Example of How Yaw
Control Operates
Excessive speed exceeds the threshold,
creating a situation where a vehicle is likely
to spin and, where applicable, jackknife.
The system reduces engine throttle and
selectively applies brakes to reduce the
vehicle speed, thereby reducing the
tendency to jackknife.
Automatic Traction Control
Your truck/tractor ABS has an automatic
traction control (ATC) feature. This feature
is controlled by a switch. This feature is
monitored by a warning lamp located on
the switch. The Traction Control warning
lamp will briefly illuminate and then go out
when the ignition switch is first turned on.
The traction control warning lamp will
illuminate whenever the ATC system
detects drive wheel spin. The lamp will
remain illuminated as long as wheel spin is
detected and the ATC system is applying
the drive wheel brakes or reducing engine
torque. Engine torque or vehicle speed
should be reduced to eliminate wheel spin
and prevent excessive application of the
ATC system.
Except for checking for proper illumination
of the ABS and traction control warning
lamps when first starting the vehicle, and
for monitoring these lamps while driving,
no special operating procedures are
required. For detailed system description,
see literature for your specific ABS that
was provided with your vehicle.
This feature helps improve traction when
vehicles are on slippery surfaces or
surfaces with poor traction (i.e. mud or
snow) by reducing drive wheel overspin.
Automatic traction control works
automatically in two different ways:
• If a drive wheel starts to spin, ATC
applies air pressure to brake the
wheel. This transfers engine torque
to the wheels with better traction.
• If all drive wheels spin, ATC
reduces engine torque to provide
improved traction.
ATC turns itself on and off, you do not have
to select this feature. If drive wheels spin
during acceleration, the ATC Warning
Lamp comes on, indicating wheel spin
control is active. Do not allow the ATC
Warning Lamp to remain on continuously
for an extended length of time. Extended,
continuous use of the ATC can cause
overheating of the drive wheel brakes.
Deep Snow and Mud Switch
A deep snow and mud switch is included
with Automatic Traction Control (ATC). The
Deep Snow and Mud feature is helpful
during acceleration. This function
increases available traction on extra soft
surfaces like snow, mud or gravel, by
slightly increasing the permissible wheel
spin. When this function is in use, the ATC
Warning Lamp blinks continuously.
Effectiveness and Limitations
ESC is designed and optimized for trucks
and for tractors that tow single trailers.
Additionally, the optional Electronic
Stability Control system's effectiveness
may be greatly reduced if
DRIVING - ABS Brakes
88 Y53-6078-1B1 (12/18/18)
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