Jeep TJ (2006 year). Manual — part 14

OFF-ROAD DRIVING TIPS

When To Use 4L (Low) Range
When off-road driving, shift to 4L (Low) for additional
traction and control on slippery or difficult terrain,
ascending or descending steep hills, and to increase low
speed pulling power. This range should be limited to
extreme situations such as deep snow, mud, steep in-
clines, or sand where additional low speed pulling power
is needed. Vehicle speeds in excess of 25 mph (40 km/h)
should be avoided when in 4L (Low) range.

Driving Through Water
Although your vehicle is capable of driving through
water, there are a number of precautions that must be
considered before entering the water:

CAUTION!

When driving through water, do not exceed 5 mph (8
km/h). Always check water depth before entering as
a precaution, and check all fluids afterward. Driving
through water may cause damage that may not be
covered by the new vehicle limited warranty.

Driving through water more than a few inches deep will
require extra caution to ensure safety and prevent dam-
age to your vehicle. If you must drive through water, try
to determine the depth and the bottom condition (and
location of any obstacles) prior to entering. Proceed with
caution and maintain a steady controlled speed less than
5 mph (8 km/h) in deep water to minimize wave effects.

Flowing Water
If the water is swift flowing and rising (as in storm
run-off) avoid crossing until the water level recedes

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and/or the flow rate is reduced. If you must cross
flowing water avoid depths in excess of 9 inches. The
flowing water can erode the streambed causing your
vehicle to sink into deeper water. Determine exit point(s)
that are downstream of your entry point to allow for
drifting.

Standing Water
Avoid driving in standing water deeper than 20 inches,
and reduce speed appropriately to minimize wave ef-
fects. Maximum speed in 20 inches of water is less than 5
mph (8 km/h).

Maintenance
After driving through deep water, inspect your vehicle
fluids and lubricants (engine oil, transmission oil, axle,
transfer case) to assure the fluids have not been contami-
nated. Contaminated fluid (milky, foamy in appearance)
should be flushed/changed as soon as possible to pre-
vent component damage.

Driving In Snow, Mud and Sand
In heavy snow, when pulling a load, or for additional
control at slower speeds, shift the transmission to a low
gear and shift the transfer case to 4L (Low) if necessary.
Refer to “Four-Wheel Drive Operation” in this section.
Do not shift to a lower gear than necessary to maintain
headway. Over-revving the engine can spin the wheels
and traction will be lost.

Avoid abrupt downshifts on icy or slippery roads, be-
cause engine braking may cause skidding and loss of
control.

Hill Climbing

NOTE:

Before attempting to climb a hill, determine the

conditions at the crest and/or on the other side.

Before climbing a steep hill,

shift the transmission to a

lower gear and shift the transfer case to 4L (Low). Use
first gear and 4L (Low) for very steep hills.

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If you stall or begin to lose headway

while climbing a

steep hill, allow your vehicle to come to a stop and
immediately apply the brakes. Restart the engine and
shift to R (Reverse). Back slowly down the hill allowing
the compression braking of the engine to help regulate
your speed. If the brakes are required to control vehicle
speed, apply them lightly and avoid locking or skidding
the tires.

WARNING!

If the engine stalls or you lose headway or cannot
make it to the top of a steep hill or grade, never
attempt to turn around. To do so may result in
tipping and rolling the vehicle. Always back care-
fully straight down a hill in R (Reverse) gear. Never
back down a hill in N (Neutral) using only the brake.

Remember, never drive diagonally across a hill-always
drive straight up or down.

If the wheels start to slip as you approach the crest of a
hill, ease off the accelerator and maintain headway by
turning the front wheels slowly left and right. This may
provide a fresh “bite” into the surface and will usually
provide traction to complete the climb.

Traction Downhill
Shift the transmission into a low gear and the transfer
case to 4L (Low) range. Let the vehicle go slowly down
the hill with all four wheels turning against engine
compression drag. This will permit you to control the
vehicle speed and direction.

When descending mountains or hills, repeated braking
can cause brake fade with loss of braking control. Avoid
repeated heavy braking by downshifting the transmis-
sion whenever possible.

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After Driving Off-Road
Off-road operation puts more stress on your vehicle than
does most on-road driving. After going off-road it is
always a good idea to check for damage. That way you
can get any problems taken care of right away and have
your vehicle ready when you need it.

• Completely inspect the underbody of your vehicle.

Check tires, body structure, steering, suspension, and
exhaust system for damage.

• Check threaded fasteners for looseness, particularly on

the chassis, drivetrain components, steering, and sus-
pension. Retighten them, if required, and torque to the
values specified in the Service Manual.

• Check for accumulations of plants or brush. These

things could be a fire hazard. They might hide damage
to fuel lines, brake hoses, axle pinion seals, and
propeller shafts.

• After extended operation in mud, sand, water, or

similar dirty conditions, have brake rotors, wheels,
brake linings, and axle yokes inspected and cleaned as
soon as possible.

WARNING!

Abrasive material in any part of the brakes may
cause excessive wear or unpredictable braking. You
might not have full braking power when you need it
to prevent an accident. If you have been operating
your vehicle in dirty conditions, get your brakes
checked and cleaned as necessary.

• If you experience unusual vibration after driving in

mud, slush or similar conditions, check the wheels for
impacted material. Impacted material can cause a
wheel imbalance and freeing the wheels of it will
correct the situation.

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TIRE SAFETY INFORMATION

Tire Markings

NOTE:

• P(Passenger)-Metric tire sizing is based on U.S. design

standards. P-Metric tires have the letter “P” molded
into the sidewall preceding the size designation. Ex-
ample: P215/65R15 95H.

• European Metric tire sizing is based on European

design standards. Tires designed to this standard have
the tire size molded into the sidewall beginning with
the section width. The letter

⬙P⬙ is absent from this tire

size designation. Example: 215/65R15 96H

• LT(Light Truck)-Metric tire sizing is based on U.S.

design standards. The size designation for LT-Metric
tires is the same as for P-Metric tires except for the
letters “LT” that are molded into the sidewall preced-
ing the size designation. Example: LT235/85R16.

• Temporary Spare tires are high pressure compact

spares designed for temporary emergency use only.
Tires designed to this standard have the letter “T”
molded into the sidewall preceding the size designa-
tion. Example: T145/80D18 103M.

• High Flotation tire sizing is based on U.S. design

standards and begins with the tire diameter molded
into the sidewall. Example: 31x10.5 R15 LT.

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Tire Sizing Chart

EXAMPLE:

Size Designation:

P

= Passenger car tire size based on U.S. design standards

ⴖ. blank. ⴖ = Passenger car tire based on European design standards
LT

= Light Truck tire based on U.S. design standards

T

= Temporary Spare tire

31

= Overall Diameter in Inches (in)

215

= Section Width in Milimeters (mm)

65

= Aspect Ratio in Percent (%)

—Ratio of section height to section width of tire.

10.5

= Section Width in Inches (in)

R

= Construction Code

—

⬙R⬙ means Radial Construction.

—

⬙D⬙ means Diagonal or Bias Construction.

15

= Rim Diameter in Inches (in)

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EXAMPLE:

Service Description:

95

= Load Index

—A numerical code associated with the maximum load a tire can carry.

H

= Speed Symbol

—A symbol indicating the range of speeds at which a tire can carry a load corresponding
to its load index under certain operating conditions.
—The maximum speed corresponding to the Speed Symbol should only be achieved un-
der specified operating conditions. (ie. tire pressure, vehicle loading, road conditions and
posted speed limits).

Load Identification:

ⴖ. blank. ⴖ = Absence of any text on sidewall of the tire indicates a Standard Load (SL) Tire
Extra Load (XL)

= Extra Load (or Reinforced) Tire

Light Load

= Light Load Tire

C,D,E

= Load range associated with the maximum load a tire can carry at a specified pressure

Maximum Load

— Maximum Load indicates the maximum load this tire is designed to carry.

Maximum Pressure

— Maximum Pressure indicates the maximum permissible cold tire inflation pressure for this

tire.

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Tire Identification Number (TIN)
The TIN may be found on one or both sides of the tire
however the date code may only be on one side. Tires with
white sidewalls will have the full TIN including date code

located on the white sidewall side of the tire. Look for the
TIN on the outboard side of black sidewall tires as mounted
on the vehicle. If the TIN is not found on the outboard side
then you will find it on the inboard side of the tire.

EXAMPLE:

DOT MA L9 ABCD 0301

DOT

= Department of Transportation

—This symbol certifies that the tire is in compliance with the U.S. Department of Transportation tire
safety standards, and is approved for highway use.

MA

= Code representing the tire manufacturing location.(2 digits)

L9

= Code representing the tire size.(2 digits)

ABCD

= Code used by tire manufacturer.(1 to 4 digits)

03

= Number representing the week in which the tire was manufactured.(2 digits)

—03 means the 3rd week.

01

= Number representing the year in which the tire was manufactured.(2 digits)

—01 means the year 2001.
—Prior to July 2000, tire manufacturers were only required to have 1 number to represent the year in
which the tire was manufactured. Example: 031 could represent the 3rd week of 1981 or 1991.

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Tire Loading and Tire Pressure

Tire Placard Location

NOTE:

The proper cold tire inflation pressures are listed

on the lower front inside corner of the driver door
opening.

Tire and Loading Information Placard

This placard tells you important information about
the,
1) number of people that can be carried in the vehicle
2) the total weight your vehicle can carry

Tire Placard Location

Tire and Loading Information

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3) the tire size designed for your vehicle
4) the cold tire inflation pressures for the front, rear
and spare tires.

Loading
The vehicle maximum load on the tire must not exceed
the load carrying capacity of the tire on your vehicle. You
will not exceed the tire’s load carrying capacity if you
adhere to the loading conditions, tire size and cold tire
inflation pressures specified on the Tire and Loading
Information placard and the Vehicle Loading section of
this manual.

NOTE:

Under a maximum loaded vehicle condition,

gross axle weight ratings (GAWR’s) for the front and rear
axles must not be exceeded. For further information on
GAWR’s, vehicle loading and trailer towing, see the
Vehicle Loading section of this manual.

To determine the maximum loading conditions of your
vehicle, locate the statement “The combined weight of
occupants and cargo should never exceed XXX kg or XXX
lbs.” on the Tire and Loading Information placard. The
combined weight of occupants, cargo/luggage and
trailer tongue weight (if applicable) should never exceed
the weight referenced here.

Steps for Determining Correct Load Limit

1. Locate the statement “The combined weight of occu-
pants and cargo should never exceed XXX pounds” on
your vehicle’s placard.

2. Determine the combined weight of the driver and
passengers that will be riding in your vehicle.

3. Subtract the combined weight of the driver and pas-
sengers from XXX kilograms or XXX pounds.

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4. The resulting figure equals the available amount of
cargo and luggage load capacity. For example, if “XXX”
amount equals 1400 lbs. and there will be five 150 lb.
passengers in your vehicle, the amount of available cargo
and luggage load capacity is 650 lb. (since 5 x 150 = 750,
and 1400 – 750 = 650 lb.)

5. Determine the combined weight of luggage and cargo
being loaded on the vehicle. That weight may not safely
exceed the available cargo and luggage load capacity
calculated in step 4.

6. If your vehicle will be towing a trailer, load from your
trailer will be transferred to your vehicle. Consult this

manual to determine how this reduces the available
cargo and luggage load capacity of your vehicle.

NOTE:

The following table shows examples on how to

calculate total load, cargo/luggage and towing capacities
of your vehicle with varying seating configurations and
number and size of occupants. This table is for illustra-
tion purposes only and may not be accurate for the
seating and load carry capacity of your vehicle.

NOTE:

For the following example the combined weight

of occupants and cargo should never exceed 865 lbs. (392
Kg).

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WARNING!

Overloading of your tires is dangerous. Overloading
can cause tire failure, affect vehicle handling, and
increase your stopping distance. Use tires of the
recommended load capacity for your vehicle. Never
overload them.

TIRES — GENERAL INFORMATION

Tire Pressure
Proper tire inflation pressure is essential to the safe and
satisfactory operation of your vehicle. Three primary
areas are affected by improper tire pressure:

1. Safety—

WARNING!

Improperly inflated tires are dangerous and can cause
accidents.

•

Under inflation increases tire flexing and can result in

tire failure.

•

Over inflation reduces a tire’s ability to cushion shock.

Objects on the road and chuck holes can cause damage
that results in tire failure.

•

Unequal tire pressures can cause steering problems.

You could lose control of your vehicle.

•

Overinflated or under inflated tires can affect vehicle

handling and can fail suddenly, resulting in loss of
vehicle control.

•

Unequal tire pressures from one side of the vehicle to

the other can cause the vehicle to drift to the right or left.
Always drive with each tire properly inflated.

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2. Economy—
Improper inflation pressures can cause uneven wear
patterns to develop across the tire tread. These abnormal
wear patterns will reduce tread life resulting in a need for
earlier tire replacement. Under inflation also increases
tire rolling resistance and results in higher fuel consump-
tion.

3. Ride Comfort and Vehicle Stability—
Proper tire inflation contributes to a comfortable ride.
Over inflation produces a jarring and uncomfortable ride.

Tire Inflation Pressures
The proper cold tire inflation pressures are listed on the
lower front inside corner of the driver door opening.

The pressure should be checked and adjusted as well as
inspecting for signs of tire wear or visible damage at least
once a month. Use a good quality pocket-type gauge to
check tire pressure. Do not make a visual judgement
when determining proper inflation. Radial tires may look
properly inflated even when they are under inflated.

Tire Placard Location

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CAUTION!

After inspecting or adjusting the tire pressure al-
ways reinstall the valve stem cap–if equipped. This
will prevent moisture and dirt from entering the
valve stem, which could damage the valve stem.

Inflation pressures specified on the placard are always
“cold tire inflation pressure”. Cold tire inflation pressure
is defined as the tire pressure after the vehicle has not
been driven for at least 3 hours, or driven less than 1 mile
(1 km) after a 3 hour period. The cold tire inflation
pressure must not exceed the maximum inflation pres-
sure molded into the tire side wall.

Check tire pressures more often if subject to a wide range
of outdoor temperatures, as tire pressures vary with
temperature changes.

Tire pressures change by approximately 1 psi (7 kPa) per
12° F (7° C) of air temperature change. Keep this in mind
when checking tire pressure inside a garage especially in
the winter.

Example: If garage temperature = 68° F (20° C) and the
outside temperature = 32° F (0° C) then the cold tire
inflation pressure should be increased by 3 psi (21 kPa),
which equals 1 psi (7 kPa) for every 12° F (7° C) for this
outside temperature condition.

Tire pressure may increase from 2 to 6 psi (13 to 40 kPa)
during operation. DO NOT reduce this normal pressure
build up or your tire pressure will be too low.

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Tire Pressures for High Speed Operation
The manufacturer advocates driving at safe speeds
within posted speed limits. Where speed limits or condi-
tions are such that the vehicle can be driven at high
speeds, maintaining correct tire inflation pressure is very
important. Increased tire pressure and reduced vehicle
loading may be required for high speed vehicle opera-
tion. Refer to original equipment or an authorized tire
dealer for recommended safe operating speeds, loading
and cold tire inflation pressures.

WARNING!

High speed driving with your vehicle under load is
dangerous. The added strain on your tires could
cause them to fail. You could have a serious accident.
Don’t drive a vehicle loaded to maximum capacity at
continuous speeds above 75 mph (120 km/h).

Radial-Ply Tires

WARNING!

Combining radial ply tires with other types of tires
on your vehicle will cause your vehicle to handle
poorly. The instability could cause an accident. Al-
ways use radial tires in sets of four. Never combine
them with other types of tires.

Cuts and punctures in radial tires are repairable only in
the tread area because of sidewall flexing. Consult your
authorized dealer for radial tire repairs.

Tire Spinning
When stuck in mud, sand, snow, or ice conditions, do not
spin your vehicle’s wheels above 35 mph (55 km/h).

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