traction control FORD EXPEDITION 1998 1.G Owners Manual

gear, and will shift to 1 (Low) after
vehicle decelerates to the proper
speed.
CONTROL-TRAC AUTOMATIC
FOUR-WHEEL DRIVE SYSTEM
(IF EQUIPPED)
Your 4x4 features a heavy-duty
Control-Trac system, including a
computer-operated transfer case.
Coupled with a
center-disconnected front axle, this
unique system is interactive with
the road, continually monitoring
and adjusting torque delivery to
the front and rear wheels to
optimize vehicle control.
Positions of the Control-Trac
system
The Control-Trac A4WD system
functions in four modes:
²2Hposition delivers power only
to the rear axle.
²A4WDposition delivers power
to the rear axle. If the rear
wheels lose traction, power will
be automatically delivered to the
front axle to maintain traction
throughout the slippery
condition.
²4Hposition provides
mechanically locked four-wheel
drive power delivery to front
and rear axles.
²4Lposition provides
mechanically locked four-wheel
4H
2HA4WD4L
Driving
108

change for the life of the vehicle.
Rear axle lubricant quantities
should not need to be checked
unless a leak is suspected.
Driving on hilly or sloping
terrain
When driving on a hill, avoid
driving crosswise or turning on
steep slopes. You could lose
traction and slip sideways. Drive
straight up, straight down or avoid
the hill completely. Know the
conditions on the other side of a
hill before driving over the crest.
When climbing a steep hill, start in
a lower gear rather than
downshifting to a lower gear from
a higher gear once the ascent has
started. This reduces strain on the
engine and the possibility of
stalling.
When descending a steep hill,
avoid sudden braking. Rapid
pumping of the brake pedal will
help slow the vehicle and still
maintain steering control.
When speed control is on and you
are driving uphill, your vehicle
speed may drop considerably,
especially if you are carrying a
heavy load.
If vehicle speed drops more than
16 km/h (10 mph), the speed
control will cancel automatically.
Resume speed with accelerator
pedal.
If speed control cancels after
climbing the hill, reset speed by
pressing and holding the SET
Driving
113

U.S. Department of
Transportation-Tire quality
grades:The U.S. Department of
Transportation requires Ford to
give you the following information
about tire grades exactly as the
government has written it.
Treadwear
The treadwear grade is a
comparative rating based on the
wear rate of the tire when tested
under controlled conditions on a
specified government test course.
For example, a tire grade 150
would wear one and one-half
(1 1/2) times as well on the
government course as a tire grade
100. The relative performance of
tires depends upon the actual
conditions of their use, however,
and may depart significantly from
the norm due to variations in
driving habits, service practices,
and differences in road
characteristics and climate.
Traction A B C
The traction grades, from highest
to lowest are A, B, and C, and they
represent the tire's ability to stop
on wet pavement as measured
under test surfaces of asphalt and
concrete. A tire marked C may
have poor traction performance.
The traction grade
assigned to this tire is
based on braking (straight
ahead) traction tests and does
not include cornering (turning)
traction.
Maintenance and care
173

Replacing the tires
Replace the tires when the wear
band is visible through the tire
treads.
Failure to follow these
precautions may adversely
affect the handling of the vehicle
and make it easier to lose control
and roll over.
Tires that are larger or smaller
than your vehicle's original tires
may also affect the accuracy of
your speedometer.
SNOW TIRES AND CHAINS
Snow tires must be the
same size and grade as the
tires you currently have on your
vehicle.
The tires on your vehicle have all
weather treads to provide traction
in rain and snow. However, in some
climates, you may need to use
snow tires and chains.
Follow these guidelines when using
snow tires and chains:
²Use only cable type chains
offered by Ford as an accessory
Maintenance and care
176

Relays .................................128,136
Remote entry system .................55
illuminated entry ......................58
locking/unlocking doors ......55,56
replacement/additional
transmitters ...............................58
replacing the batteries .............57
Reporting safety defects ..........207
Safety restraints
automatic locking mode
(retractor) .......................72,73,74
extension assembly ..................76
for children ...............................83
lap and shoulder belts ........71,72
maintenance ..............................77
proper use .................................70
warning light and chime 12,76,77
Safety seats for children
attaching with tether straps ....90
automatic locking mode
(retractor) .................................87
tether anchorage hardware .....90
Seats ............................................60
adjusting the seat, manual .......60
adjusting the seat, power ........61
lumbar support .........................60
rear flip fold seat .................63,64
rear seat access ........................63
reclining the seat ......................65
third row seat ............65,66,67,68
Servicing your vehicle ..............150
precautions when servicing ...150
Side mirrors .................................51
Snowplowing .................................3
Special notice
utility-type vehicles ....................3
Specification chart, lubricants .202
Speed control ..............................33
canceling a set speed ...............36
resuming a set speed ...............37
tap up/tap down .......................35
turning off .................................33Speed sensitive steering ..........101
Speedometer ...............................14
Starting your vehicle ........92,93,95
Steering, power .........................101
Storage compartments
overhead storage
compartment .............................40
Tachometer
mechanical cluster ...................15
Tilt steering wheel ......................37
Tires ....................................172,174
checking the pressure ............174
replacing ..................................176
rotating ....................................175
snow tires and chains ............176
treadwear ................................173
Traction-lok rear axle ........103,167
Trailer towing
calculating maximum trailer
weight ......................................119
tips ...........................................124
Transmission .............................164
automatic
operation ............104,105,106,107
fluid, checking and adding
(automatic) .............................164
Trip odometer .............................15
Turn signal
lever ...........................................32
Vehicle dimensions ...................204
Vehicle Identification Number
(VIN) ..........................................206
Vehicle loading ..........................115
Ventilating your vehicle .............97
Warning chimes .............................6
Washer fluid
rear window reservoir ............158
warning light .............................12
Windows
accessory delay .........................48
power windows, operating ..45,47
Index
210