2 0 0 8 K n I G h t
chassIs InformatIon — 10
199
ATC reacts to drive wheel slip by:
Reducing engine torque to the drive
wheel if road speed is above 25 mph.
Reducing engine torque and activating
drive axle brake controls if road speed
is below 25 mph. If the brake control
activates, it remains active regardless of
road speed.
ATC Switch:
Activating the ATC switch reduces ECU
control over engine torque. Momentarily
pressing the ATC switch allows the ECU to
increase the amount of engine torque applied to
the drive wheel in an ATC event. The amount
of engine torque applied to the drive wheel will
vary with the amount of drive wheel slip versus
road speed. In an ATC event, the ECU remains
active regardless of road speed or switch
position. The light flashes slowly when the ATC
switch is activated.
ATC Indicator Light:
During normal operation, the
ATC indicator light on the dash
will illuminate steady when the
ignition key is turned
ON
. If an
ATC event occurs, the indicator
light will flash quickly. The
indicator light will flash slowly if
the ATC switch is activated.
CAUTION
Normally the switch should remain
inactive. During an ATC event (drive
wheel slip) the ECU will automatically
optimize drive wheel traction in most
situations. Activating the switch during
periods of wheel slip can increase torque
to the spinning drive wheel. Drive train
damage can occur if the spinning drive
wheel should suddenly regain traction.
If the motorhome is stuck it is advised
to call a professional towing company
to limit the possibility of body and drive
train damage.
front axle
While driving the motorhome, be aware of
any changes in the feel of steering and have
the system checked when noting apparent
differences. It is normal to hear some hydraulic
noise from the steering, especially when the
steering is at maximum, or while turning
the wheel when the motorhome is parked.
Investigate any unusual or loud noises that
occur. Begin by checking the level of the
hydraulic fluid. Traveling at slow speeds over
rough surfaces may cause a “clunking” noise to
emanate from the steering column, but if noise is
heard on smooth surfaces while sharply turning
back and forth, the noise should be inspected
and repaired as necessary.
Shimmy and looseness should be checked
and corrected as soon as possible. If looseness
is felt in the steering, the steering linkages can
be observed while someone turns the steering
wheel left and right. Watch the linkages for
evident play or uneven interaction between
components to help pinpoint a problem. Wheel
bearings should be cleaned and repacked with
high temperature disc brake grease every 30,000
miles. Have the steering system checked for
damage after a severe impact, such as striking
large potholes or curbs, and front-end collisions.
Observe the alignment of the steering wheel; a
change in the alignment may indicate damage to
the steering components or suspension.
Maintenance for the system entails adequate
lubrication. Use only a hand operated grease gun
on the fittings. Grease fittings for the steering
system are found on the both ends of the drag
link (the bar connecting the steering gear to the
axle), and on the intermediate steering shaft
located between the steering wheel and steering
gear. The correct wheel alignment promotes
longer tire wear and ease of handling while
minimizing the strain on the steering system
and the axle components. Use NLGI #2 Lithium
soap base lubricant for all steering linkage and
brake components.
090372
080498y
Located on
driver’s console
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