tire type JEEP WRANGLER UNLIMITED 2021 Owner handbook (in English)

2
HOW TO USE THIS MANUAL
HOW TO USE THIS MANUAL
Essential Information
Consult the Table of Contents to determine
which section contains the information you
desire.
Since the specification of your vehicle
depends on the items of equipment ordered,
certain descriptions and illustrations may
differ from your vehicle's equipment.
The detailed Index at the back of this User
Guide contains a complete listing of all
subjects.
Symbols
Some vehicle components have colored
labels whose symbols indicate precautions to
be observed when using this component.
Refer to “Warning Lights and Messages” in
“Getting To Know Your Instrument Panel”
for further information on the symbols used
in your vehicle.
ROLLOVER WARNING
Utility vehicles have a significantly higher
rollover rate than other types of vehicles.
This vehicle has a higher ground clearanceand a higher center of gravity than many
passenger vehicles. It is capable of
performing better in a wide variety of off-road
applications. Driven in an unsafe manner, all
vehicles can go out of control. Because of the
higher center of gravity, if this vehicle is out
of control it may roll over when some other
vehicles may not.
Do not attempt sharp turns, abrupt maneu
-
vers, or other unsafe driving actions that can
cause loss of vehicle control. Failure to
operate this vehicle safely may result in a
collision, rollover of the vehicle, and severe
or fatal injury. Drive carefully.
Rollover Warning Label

Failure to use the driver and passenger seat
belts provided is a major cause of severe or
fatal injury. In a rollover crash, an unbelted person is significantly more likely to die than a
person wearing a seat belt. Always buckle up.

WARNINGS AND CAUTIONS
This User Guide contains
WARNINGS against
operating procedures that could result in a
collision, bodily injury and/or death. It also
contains CAUTIONS against procedures that
could result in damage to your vehicle. If you
do not read this entire guide, you may miss
important information. Observe all Warnings
and Cautions.
VEHICLE MODIFICATIONS/
ALTERATIONS
WARNING!
Any modifications or alterations to this
vehicle could seriously affect its
roadworthiness and safety and may lead to
a collision resulting in serious injury or
death.
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TRAILER TOWING ................................ 175

Trailer Towing Weights
(Maximum Trailer Weight Ratings)..... 175

RECREATIONAL TOWING (BEHIND
MOTORHOME, ETC.) ............................. 176
Towing This Vehicle Behind
Another Vehicle ............................ 176 Recreational Towing — Four-Wheel
Drive Models ................................ 176
IN CASE OF EMERGENCY
HAZARD WARNING FLASHERS............... 179
BULB REPLACEMENT............................ 179
Replacement Bulbs ...................... 179
Bulb Replacement ........................ 181
FUSES ............................................... 183
General Information ...................... 183
Power Distribution Center (PDC) .... 184
JACKING AND TIRE CHANGING .............. 192
Jack Location .............................. 193
Spare Tire Removal ...................... 193
Preparations For Jacking .............. 194
Jacking Instructions ...................... 195
Road Tire Installation.................... 197
Declaration Of Conformance .......... 198
Jack Usage Precautions................. 200
JUMP STARTING .................................. 201
Preparations For Jump Start .......... 201
Jump Starting Procedure ............... 202
IF YOUR ENGINE OVERHEATS ...............204
MANUAL PARK RELEASE .....................204
FREEING A STUCK VEHICLE ..................206
TOWING A DISABLED VEHICLE ..............207
Four–Wheel Drive Models .............. 208
Without The Key Fob .................... 208
Tow Eye Usage............................. 208
ENHANCED ACCIDENT RESPONSE
SYSTEM (EARS) ..................................209
EVENT DATA RECORDER (EDR) ..............209
SERVICING AND MAINTENANCE
SCHEDULED SERVICING .......................210
Scheduled Servicing —
Gasoline Engine ........................... 210 Scheduled Servicing —
Diesel Engine............................... 216
ENGINE COMPARTMENT .......................221
2.0L Gasoline Engine .................. 221
3.6L Gasoline Engine .................. 222
2.2L Diesel Engine ....................... 223
Checking Oil Level —
Gasoline Engine .......................... 224 Adding Washer Fluid .................... 224
Maintenance-Free Battery ............ 225
Pressure Washing ......................... 225
DEALER SERVICE .................................226
Windshield Wiper Blades ...............226
Exhaust System ...........................228
Cooling System .............................229
Brake System ..............................230
Automatic Transmission ................231
RAISING THE VEHICLE ..........................232 TIRES .................................................232
Tires — General Information .........232
Tire Types ....................................237
Spare Tires — If Equipped ............237
Wheel And Wheel Trim Care ..........239

Tire Chains And Traction Devices ..... 240

Tire Rotation Recommendations ....241
STORING THE VEHICLE .........................241
BODYWORK .........................................242
Body And Underbody
Maintenance ................................242 Preserving The Bodywork ...............243
INTERIORS ..........................................245
Seats And Fabric Parts ..................245
Plastic And Coated Parts ...............246
Leather Parts ................................246
Glass Surfaces .............................246
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71
Should one or more tires be in the condition
mentioned above, the display will show the
indications corresponding to each tire.
Each tire, including the spare (if provided),
should be checked monthly when cold and
inflated to the inflation pressure recom-
mended by the vehicle manufacturer on the
vehicle placard or tire inflation pressure
label. If your vehicle has tires of a different
size than the size indicated on the vehicle
placard or tire inflation pressure label, you
should determine the proper tire inflation
pressure for those tires.
As an added safety feature, your vehicle has
been equipped with a Tire Pressure Moni -
toring System (TPMS) that illuminates a low
tire pressure telltale when one or more of
your tires is significantly under-inflated.
Accordingly, when the low tire pressure tell -tale illuminates, you should stop and check
your tires as soon as possible, and inflate
them to the proper pressure. Driving on a
significantly under-inflated tire causes the
tire to overheat and can lead to tire failure.
Under-inflation also reduces fuel efficiency
and tire tread life, and may affect the
vehicle’s handling and stopping ability.
Please note that the TPMS is not a substitute
for proper tire maintenance, and it is the
driver’s responsibility to maintain correct tire
pressure, even if under-inflation has not
reached the level to trigger illumination of
the TPMS low tire pressure telltale.
Your vehicle has also been equipped with a
TPMS malfunction indicator to indicate
when the system is not operating properly.
The TPMS malfunction indicator is
combined with the low tire pressure telltale.
When the system detects a malfunction, the
telltale will flash for approximately one
minute and then remain continuously illumi
-
nated. This sequence will continue upon
subsequent vehicle start-ups as long as the
malfunction exists. When the malfunction
indicator is illuminated, the system may not
be able to detect or signal low tire pressure
as intended. TPMS malfunctions may occur
for a variety of reasons, including the instal -lation of replacement or alternate tires or
wheels on the vehicle that prevent the TPMS
from functioning properly. Always check the
TPMS malfunction telltale after replacing
one or more tires or wheels on your vehicle to
ensure that the replacement or alternate
tires and wheels allow the TPMS to continue
to function properly.
CAUTION!
Do not continue driving with one or more
flat tires as handling may be
compromised. Stop the vehicle, avoiding
sharp braking and steering. If a tire
puncture occurs, repair immediately using
the dedicated tire repair kit and contact an
authorized dealer as soon as possible.
CAUTION!
The TPMS has been optimized for the
original equipment tires and wheels.
TPMS pressures and warning have been
established for the tire size equipped on
your vehicle. Undesirable system operation
or sensor damage may result when using
replacement equipment that is not of the
same size, type, and/or style. Aftermarket
wheels can cause sensor damage. Using
aftermarket tire sealants may cause the
Tire Pressure Monitoring System (TPMS)
sensor to become inoperable. After using
an aftermarket tire sealant it is
recommended that you take your vehicle to
an authorized dealer to have your sensor
function checked.
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81
(Continued)ESC Operating Modes
NOTE:
Depending upon model and mode of opera-
tion, the ESC system may have multiple
operating modes.
ESC On
“ESC On” is the normal operating mode for
the ESC. Whenever the vehicle is started, the
ESC system will be in this mode. This mode should be used for most driving conditions.
Alternate ESC modes should only be used for
specific reasons as noted in the following
paragraphs.
Partial Off

The “Partial Off” mode is intended for times
when a more spirited driving experience is
desired. This mode may modify TCS and ESC
thresholds for activation, which allows for more
wheel spin than normally allowed. This mode
may be useful if the vehicle becomes stuck.

To enter the “Partial Off” mode, momentarily
push the “ESC OFF” switch and the “ESC
OFF Indicator Light” will illuminate. To turn
the ESC on again, momentarily push the
“ESC OFF” switch and the “ESC OFF Indi
-
cator Light” will turn off.
NOTE:
For vehicles with multiple partial ESC
modes, a momentary button push will toggle
the ESC mode. Multiple momentary button
pushes may be required to return to “ESC
On” mode.
WARNING!
Electronic Stability Control (ESC) cannot
prevent the natural laws of physics from
acting on the vehicle, nor can it increase
the traction afforded by prevailing road
conditions. ESC cannot prevent acci -
dents, including those resulting from
excessive speed in turns, driving on very
slippery surfaces, or hydroplaning. ESC
also cannot prevent accidents resulting
from loss of vehicle control due to inap -
propriate driver input for the conditions.
Only a safe, attentive, and skillful driver
can prevent accidents. The capabilities
of an ESC equipped vehicle must never
be exploited in a reckless or dangerous
manner which could jeopardize the
user’s safety or the safety of others.Vehicle modifications, or failure to prop -
erly maintain your vehicle, may change
the handling characteristics of your
vehicle, and may negatively affect the
performance of the ESC system.
Changes to the steering system, suspen -
sion, braking system, tire type and size
or wheel size may adversely affect ESC
performance. Improperly inflated and
unevenly worn tires may also degrade
ESC performance. Any vehicle modifica-
tion or poor vehicle maintenance that
reduces the effectiveness of the ESC
system can increase the risk of loss of
vehicle control, vehicle rollover, personal
injury and death.
WARNING! (Continued)
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93
Maintenance” for information on how to
properly inflate the vehicle’s tires. The tire
pressure will also increase as the vehicle is
driven. This is normal and there should be no
adjustment for this increased pressure.
The TPMS will warn the driver of a low tire
pressure if the tire pressure falls below the
low-pressure warning limit for any reason,
including low temperature effects and
natural pressure loss through the tire.
The TPMS will continue to warn the driver of
low tire pressure as long as the condition
exists, and will not turn off until the tire pres-
sure is at or above the recommended cold
placard pressure. Once the low tire pressure
warning (Tire Pressure Monitoring System
Warning Light) illuminates, you must
increase the tire pressure to the recom -
mended cold placard pressure in order for
the TPMS Light to turn off.
NOTE:
When filling warm tires, the tire pressure
may need to be increased up to an additional
4 psi (28 kPa) above the recommended cold
placard pressure in order to turn the TPMS
Warning Light off.
The system will automatically update and the
TPMS Warning Light will turn off once the
system receives the updated tire pressures. The
vehicle may need to be driven for up to
10 minutes above 15 mph (24 km/h) in order
for the TPMS to receive this information.

For example, your vehicle may have a
recommended cold (parked for more than
three hours) placard pressure of 33 psi
(227 kPa). If the ambient temperature is
68°F (20°C) and the measured tire pressure
is 28 psi (193 kPa), a temperature drop to
20°F (-7°C) will decrease the tire pressure
to approximately 24 psi (165 kPa). This tire
pressure is low enough to turn on the TPMS
Warning Light. Driving the vehicle may
cause the tire pressure to rise to approxi -
mately 28 psi (193 kPa), but the TPMS
Warning Light will still be on. In this situa -
tion, the TPMS Warning Light will turn off
only after the tires are inflated to the
vehicle’s recommended cold placard pres -
sure value. CAUTION!

The TPMS has been optimized for the orig -
inal equipment tires and wheels. TPMS
pressures and warning have been estab -
lished for the tire size equipped on your
vehicle. Undesirable system operation or
sensor damage may result when using
replacement equipment that is not of the
same size, type, and/or style. The TPM
sensor is not designed for use on after -
market wheels, and may contribute to a
poor overall system performance.
Customers are encouraged to use Original
Equipment Manufacturer (OEM) wheels to
assure TPMS feature operation.

Using aftermarket tire sealants may
cause the Tire Pressure Monitoring
System (TPMS) sensor to become inop -
erable. After using an aftermarket tire
sealant it is recommended that you take
your vehicle to an authorized dealer to
have your sensor function checked.
After inspecting or adjusting the tire
pressure always reinstall the valve stem
cap. This will prevent moisture and dirt
from entering the valve stem, which
could damage the TPMS sensor.
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147
4H
Four-Wheel Drive High Range — This range
maximizes torque to the front driveshaft,
forcing the front and rear wheels to rotate at
the same speed. This range provides addi-
tional traction for loose, slippery road
surfaces only.
NEUTRAL (N)
Neutral — This range disengages both the
front and rear driveshafts from the power -
train. To be used for flat towing behind
another vehicle.
Refer to “Recreational Towing” in this
chapter for further information. 4L
Four-Wheel Drive Low Range — This range
provides low speed four-wheel drive. It maxi
-
mizes torque to the front driveshaft, forcing
the front and rear wheels to rotate at the
same speed. This range provides additional
traction and maximum pulling power for
loose, slippery road surfaces only. Do not
exceed 25 mph (40 km/h).
The transfer case is intended to be driven in
the 2H position for normal street and
highway conditions, such as hard-surfaced
roads.
In the event that additional traction is
required, the transfer case 4H and 4L posi -
tions can be used to lock the front and rear
driveshafts together, forcing the front and
rear wheels to rotate at the same speed. The
4H and 4L positions are intended for loose,
slippery road surfaces only and not intended
for normal driving. Driving in the 4H and 4L
positions on hard-surfaced roads will cause
increased tire wear and damage to the drive -
line components. Refer to “Shifting Proce -
dures” in this section for further information
on shifting into 4H or 4L. The instrument cluster alerts the driver that
the vehicle is in four-wheel drive, and the
front and rear driveshafts are locked
together. The light will illuminate when the
transfer case is shifted into the 4H position.
When operating your vehicle in 4L, the
engine speed will be approximately three
times (four times for Rubicon models) that of
the 2H or 4H positions at a given road speed.
Take care not to overspeed the engine.
Proper operation of four-wheel drive vehicles
depends on tires of equal size, type, and
circumference on each wheel. Any difference
will adversely affect shifting and cause
damage to the transfer case.
Because four-wheel drive provides improved
traction, there is a tendency to exceed safe
turning and stopping speeds. Do not go
faster than road conditions permit.
Shifting Procedures
2H To 4H Or 4H To 2H
Shifting between 2H and 4H can be made
with the vehicle stopped or in motion. The
preferred shifting speed would be 0 to
45 mph (72 km/h). With the vehicle in
motion, the transfer case will engage/disen
-
WARNING!
You or others could be injured or killed if
you leave the vehicle unattended with the
transfer case in the NEUTRAL (N) position
without first fully engaging the parking
brake. The transfer case NEUTRAL (N)
position disengages both the front and rear
driveshafts from the powertrain, and will
allow the vehicle to roll, even if the
automatic transmission is in PARK. The
parking brake should always be applied
when the driver is not in the vehicle.
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STARTING AND OPERATING
150
In the event that additional traction is
required, the transfer case 4H and 4L posi-
tions can be used to lock the front and rear
driveshafts together, forcing the front and
rear wheels to rotate at the same speed. The
4H and 4L positions are intended for loose,
slippery road surfaces only and not intended
for normal driving. Driving in the 4H and 4L
positions on hard-surfaced roads will cause
increased tire wear and damage to the drive -
line components. Refer to “Shifting Proce -
dures” in this section for further information
on shifting into 4H or 4L.
The instrument cluster alerts the driver that
the vehicle is in four-wheel drive, and the
front and rear driveshafts are locked
together. The light will illuminate when the
transfer case is shifted into the 4H position.
When operating your vehicle in 4L, the
engine speed will be approximately three
times (four times for Rubicon models) that of
the 2H or 4H positions at a given road speed.
Take care not to overspeed the engine.
Proper operation of four-wheel drive vehicles
depends on tires of equal size, type, and
circumference on each wheel. Any difference
will adversely affect shifting and cause
damage to the transfer case. Because four-wheel drive provides improved
traction, there is a tendency to exceed safe
turning and stopping speeds. Do not go
faster than road conditions permit.
Shifting Procedures
2H To 4H Auto Or 4H Auto To 2H
Shifting between 2H and 4H Auto can be
made with the vehicle stopped or in motion.
The preferred shifting speed would be 0 to
45 mph (72 km/h). With the vehicle in
motion, the transfer case will engage/disen
-
gage faster if you momentarily release the
accelerator pedal after completing the shift.
Do not accelerate while shifting the transfer
case. Apply a constant force when shifting
the transfer case lever.
2H/4H Auto To 4H Part Time Or 4H Part Time To
2H/4H Auto
Shifting between 2H/4H AUTO to 4H PART
TIME can be made with the vehicle stopped
or in motion. The preferred shifting speed
would be 0 to 45 mph (72 km/h). With the
vehicle in motion, the transfer case will
engage/disengage faster if you momentarily
release the accelerator pedal after
completing the shift. Do not accelerate while shifting the transfer case. Apply a constant
force when shifting the transfer case lever.
NOTE:
Do not attempt to make a shift while only
the front or rear wheels are spinning. The
front and rear driveshaft speeds must be
equal for the shift to take place. Shifting
while only the front or rear wheels are
spinning can cause damage to the transfer
case.
Delayed shifts out of four-wheel drive may
be experienced due to uneven tire wear,
low or uneven tire pressures, excessive
vehicle loading, or cold temperatures.
Shifting effort will increase with speed,
this is normal.
During cold weather, you may experience
increased effort in shifting until the transfer
case fluid warms up. This is normal.
4H Part Time/4H Auto To 4L Or 4L To 4H Part Time/
4H Auto
With the vehicle rolling at 2 to 3 mph (3 to
5 km/h), shift the transmission into
NEUTRAL (N). While the vehicle is coasting
at 2 to 3 mph (3 to 5 km/h), shift the
transfer case lever firmly to the desired posi -
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STARTING AND OPERATING
174
VEHICLE LOADING
Weights Label
As required by local regulations, your vehicle
has a weights label affixed to the driver's side
door or pillar.Weights Label (Example)
This label contains:
1. The manufacturer’s company name
2. The whole vehicle type-approval number
3. The Vehicle Identification Number (VIN) 4. Gross Vehicle Weight Rating (GVWR)
5. Gross Combined Weight Rating (GCWR)
6. Front Gross Axle Weight Rating (FGAWR)
7. Rear Gross Axle Weight Rating (RGAWR)
NOTE:
For specific markets the label could be
different, respect the one shown in the image
contains: the GVWR, GAWR front and rear.
Gross Vehicle Weight Rating (GVWR)
The Gross Vehicle Weight Rating (GVWR) is
the total permissible weight of your vehicle
including driver, passengers, vehicle,
options and cargo. The label also specifies
maximum capacities of front and rear axle
systems (GAWR). Total load must be limited
so GVWR and front and rear GAWR are not
exceeded.
Payload
The payload of a vehicle is defined as the
allowable load weight a truck can carry,
including the weight of the driver, all passen
-
gers, options and cargo.
Gross Axle Weight Rating (GAWR)
The Gross Axle Weight Rating (GAWR) is the
maximum permissible load on the front and
rear axles. The load must be distributed in
the cargo area so that the GAWR of each axle
is not exceeded.
Each axle GAWR is determined by the
components in the system with the lowest
load carrying capacity (axle, springs, tires or
wheels). Heavier axles or suspension compo -
nents sometimes specified by purchasers for
increased durability does not necessarily
increase the vehicle's GVWR.
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SERVICING AND MAINTENANCE
230(Continued)
Coolant Checks
Check the engine and, intercooler (if
equipped) coolant (antifreeze) protection
every 12 months (before the onset of
freezing weather, where applicable). If the
engine and, intercooler (if equipped) is dirty
or rusty in appearance, the system should be
drained, flushed and refilled with fresh OAT
coolant (conforming to MS.90032) by an
authorized dealer. Check the front of the A/C
condenser (if equipped) or radiator for any
accumulation of bugs, leaves, etc. If dirty,
clean by gently spraying water from a garden
hose vertically down the face of the A/C
condenser (if equipped) or the back of the
radiator core.Check the engine and, intercooler (if
equipped) cooling system hoses for brittle
rubber, cracking, tears, cuts, and tightness
of the connection at the coolant recovery
bottle and radiator. Inspect the entire system
for leaks. DO NOT REMOVE THE COOLANT
PRESSURE CAP WHEN THE COOLING
SYSTEM IS HOT.
Brake System
In order to ensure brake system perfor
-
mance, all brake system components should
be inspected periodically. Refer to the
“Maintenance Plan” in this section for the
proper maintenance intervals.
Fluid Level Check — Brake Master Cylinder
The fluid level of the master cylinder should
be checked whenever the vehicle is serviced,
or immediately if the brake system warning
light is on. If necessary, add fluid to bring
level within the designated marks on the side
of the reservoir of the brake master cylinder.
Be sure to clean the top of the master
cylinder area before removing cap. With disc
brakes, fluid level can be expected to fall as
the brake pads wear. Brake fluid level should
be checked when pads are replaced. If the
brake fluid is abnormally low, check the
system for leaks.
Refer to “Fluids And Lubricants” in “Tech -
nical Specifications” for further information.When working near the radiator cooling
fan, turn the ignition to the OFF mode.
The fan is temperature controlled and
can start at any time the ignition is in the
ON mode.
WARNING! (Continued)
WARNING!
Riding the brakes can lead to brake failure
and possibly a collision. Driving with your
foot resting or riding on the brake pedal
can result in abnormally high brake
temperatures, excessive lining wear, and
possible brake damage. You would not
have your full braking capacity in an
emergency. WARNING!
Use only manufacturer's recommended
brake fluid. Refer to “Fluids And Lubri -
cants” in “Technical Specifications” for
further information. Using the wrong
type of brake fluid can severely damage
your brake system and/or impair its
performance. The proper type of brake
fluid for your vehicle is also identified on
the original factory installed hydraulic
master cylinder reservoir.
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233
Tread Wear
Improper cold tire inflation pressures can
cause abnormal wear patterns and reduced
tread life, resulting in the need for earlier tire
replacement.
Ride Comfort And Vehicle Stability
Proper tire inflation contributes to a comfort-
able ride. Overinflation produces a jarring
and uncomfortable ride.
Tire Inflation Pressures
The proper cold tire inflation pressure is
listed on the left side B-Pillar or rear edge of
the passenger door.
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. Tire size designed for your vehicle.
3. Cold tire inflation pressures for the front, rear, and spare tires.
At least once a month:
Check and adjust tire pressure with a good
quality pocket-type pressure gauge. Do not
make a visual judgement when deter -
mining proper inflation. Tires may look
properly inflated even when they are
under-inflated.
Inspect tires for signs of tire wear or visible
damage. 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 three hours, or driven less
than 1 mile (1.6 km) after sitting for a
minimum of three hours. The cold tire infla
-
tion pressure must not exceed the maximum
inflation pressure 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.
CAUTION!
After inspecting or adjusting the tire
pressure, always reinstall the valve stem
cap. This will prevent moisture and dirt
from entering the valve stem, which could
damage the valve stem.
2020_JEEP_JL_WRANGLER_UG_RHD_UK.book Page 233