Chassis Information --- Section 10
The Executive 2005
441
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 indicator light flashes slowly
when the ATC switch is activated.
ATC Indicator Light:
During normal operation, the ATC indicator light will illuminate steady when the ignition key is
turned ON. The light remains illuminated until the first brake application. 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 spin-
ning 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 profes-
sional 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 steer-
ing 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 strik-
ing 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.
080331c
ATC Indicator Light ATC Switch
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