JEEP WRANGLER 2010 JK / 3.G Service Manual

Engine/
Transmission Axle
Model GCWR
(Gross
Combined
Wt. Rating) Frontal Area
Max. GTW
(Gross
Trailer Wt.) Max. Trailer
Tongue Wt.
3.8L/Manual 3.21 Four–Door Sahara Model (4WD)5,625 lbs
(2 551 kg) 32 sq ft
(2.97 sq m) 1,000 lbs
(453 kg) 100 lbs (45 kg)
3.8L/Manual 3.73 Four–Door Sahara Model (4WD)8,125 lbs
(3 685 kg) 32 sq ft
(2.97 sq m) 3,500 lbs
(1 587 kg) 350 lbs (159 kg)
3.8L/Automatic 3.73 Four–Door Sahara Model (4WD)8,127 lbs
(3 686 kg) 32 sq ft
(2.97 sq m) 3,500 lbs
(1 587 kg) 350 lbs (159 kg)
3.8L/Manual 4.10 Four–Door Rubicon Model (4WD)8,248 lbs
(3 741 kg) 32 sq ft
(2.97 sq m) 3,500 lbs
(1 587 kg) 350 lbs (159 kg)
3.8L/Automatic 4.10 Four–Door Rubicon Model (4WD)8,249 lbs
(3 742 kg) 32 sq ft
(2.97 sq m) 3,500 lbs
(1 587 kg) 350 lbs (159 kg)
Refer to local laws for maximum trailer towing speeds.
39
UTILITY

RECREATIONAL TOWING
(BEHIND MOTORHOME)
Towing - Two-Wheel Drive
Models
• Recreational towing with all fourwheels on the ground is allowed ONLY
if the rear driveshaft is removed. See
your authorized dealer or refer to the
Service Manual. Towing with the rear
wheels on the ground while the
driveshaft is connected can result in
severe transmission damage.
WARNING!
If the driveshaft is removed, the
vehicle can roll even if the
transmission is in PARK, which could
cause serious injury or death.
• The parking brake must be firmly engaged and the wheels chocked
during driveshaft removal and
installation. The parking brake must
remain engaged unless the vehicle is
securely and properly connected to the
tow vehicle, or the driveshaft is
completely reinstalled. See your
authorized dealer for proper driveshaft
removal and reinstallation procedures,
including flange orientation/alignment,
use of thread-locking compound,
proper bolt torque specifications, etc.
Towing - Four-Wheel Drive
Models
• Turn off engine and depress brakepedal.
• Shift automatic transmission into NEUTRAL or depress clutch pedal on
manual transmission.
• Shift transfer case to N (Neutral).
• Start the engine, shift into drive or 1st gear and ensure there is no vehicle
movement. • Shut off the engine, place ignition into
ACC position and shift automatic
transmission into PARK, manual
transmission into NEUTRAL.
• Apply the parking brake, attach vehicle to tow vehicle and release the parking
brake.
• Disconnect negative battery cable.
• Refer to your Owner's Manual on the DVD for further details.
BRAKE/TRANSMISSION
INTERLOCK MANUAL
OVERRIDE
• Your vehicle may be equipped with ashift lock manual override.
• The manual override may be used in the event that the shift lever should fail
to move from PARK with the Key Fob in
the ON position and the brake pedal
pressed.
• To operate the shift lock manual override, perform the following steps:
• Turn the Key Fob to the ON position but do not start the engine.
• Firmly set the parking brake.
• Using a flat-bladed screwdriver, carefully remove the shift lock
manual override cover which is
located on the PRNDL bezel.
• Press and maintain firm pressure on the brake pedal.
• Using a screwdriver, reach into the manual override opening. Press and
hold the shift lock lever down.
• Move the shift lever into the NEUTRAL position and start the
vehicle.
• Reinstall the override cover.
• Have your vehicle inspected by your local authorized dealer if the shift lock
manual override has been used.
UTILITY
40

24 HOUR TOWING ASSISTANCE - U.S. ONLY
• Dial toll-free 1-800-521-2779.
• Provide your name, vehicle identification number and license plate number.
• Provide your location, including telephone number, from which you are calling.
• Briefly describe the nature of the problem and answer a few simple questions.
• You will be given the name of the service provider and an estimated time of arrival. If youfeel you are in an “unsafe situation”, please let us know. With your consent, we will
contact local police or safety authorities.
INSTRUMENT CLUSTER WARNING LIGHTS
- Electronic Stability Control (ESC) Malfunction Indicator Light
• If the “ESC Malfunction Indicator Light” comes on continuously with the engine running, amalfunction has been detected in the ESC system. If this light remains on after several
ignition cycles, and the vehicle has been driven several miles (kilometers) at speeds
greater than 30 mph (48 km/h), we recommend you drive to the nearest service center as
soon as possible to have the problem diagnosed and corrected.
• The “ESC Malfunction Indicator Light” starts to flash as soon as the tires lose traction and the ESC system becomes active. If the light begins to flash during acceleration, ease up
on the accelerator and apply as little throttle as possible. Be sure to adapt your speed
and driving to the prevailing road conditions. The light also flashes when TCS is active. To
improve the vehicle's traction when starting off in deep snow, sand or gravel, it may be
desirable to switch the ESC system to Partial Off mode by momentarily pressing the ESC
Off
switch.
- Tire Pressure Monitoring System (TPMS) Light
• A Tire Pressure Monitoring Light and a “low tire” message will display in your instrumentcluster along with an audible chime if one or more of your vehicle’s four road tires are
significantly under-inflated.
• Check the inflation pressure of each tire and inflate to the recommended pressure for your vehicle. The tire pressures recommended for your vehicle are found on the “Tire and
Loading Information” label located on the driver’s side door opening. The TPMS light
should not be used as a tire pressure gauge when adjusting your tire pressure.
• It is recommended that you check the tire pressure in the morning when tires are cool; inflate each tire to the recommended pressure for your vehicle. The light will turn off
after your vehicle’s tire pressures are properly inflated and the pressure has been
recognized. The vehicle may need to be driven for up to 20 minutes above 15 mph
(25 km/h) before the light will turn off.
• Temperature changes can affect tire pressure, causing the TPMS light to turn on. Tire pressures will also increase as the vehicle is driven – this is normal and you should not
adjust for this increased pressure.
• Driving on under-inflated tires reduces your vehicle’s fuel efficiency and tire tread life. If a spare tire is in use on the vehicle, the TPMS light may turn on.
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WHAT TO DO IN EMERGENCIES

- Engine Temperature Warning Light
• This light warns of an overheated engine condition.
• If the light turns on and a warning chime sounds while driving, safely pull over and stopthe vehicle. If the A/C system is on, turn it off. Also, shift the transmission into NEUTRAL
and idle the vehicle. If the temperature reading does not return to normal, turn the
engine off immediately.
• We recommend that you do not operate the vehicle or engine damage will occur. Have the vehicle serviced immediately.
WARNING!
A hot engine cooling system is dangerous. You or others could be badly burned by
steam or boiling coolant. You may want to call an authorized dealership for service if
your vehicle overheats.
- Brake Warning Light
• The Brake Warning light illuminates when there is either a system malfunction or theparking brake is applied. If the light is on and the parking brake is not applied, it
indicates a possible brake hydraulic malfunction, brake booster problem or an Anti-Lock
Brake System problem.
• We recommend you drive to the nearest Service Center and have the vehicle serviced immediately.
WARNING!
Driving a vehicle with the red brake light on is dangerous. Part of the brake system
may have failed. It will take longer to stop the vehicle. You could have an accident.
Have the vehicle checked immediately.
- Malfunction Indicator Light (MIL)
• Certain conditions, such as a loose or missing gas cap, poor fuel quality, etc., mayilluminate the MIL after engine start. The vehicle should be serviced if the light stays on
through several typical driving cycles. In most situations, the vehicle will drive normally
and not require towing.
• If the MIL flashes when the engine is running, serious conditions may exist that could lead to immediate loss of power or severe catalytic converter damage. We recommend
you do not operate the vehicle. Have the vehicle serviced as soon as possible if this
occurs.
WHAT TO DO IN EMERGENCIES
42

- Electronic Stability Program (ESP) Malfunction Indicator
Light/Brake Assist System (BAS) Warning Light
• If the ESP/BAS warning light comes on continuously with the engine running, a
malfunction has been detected.
• If this light remains on after several ignition cycles, and the vehicle has been driven several miles (kilometers) at speeds greater than 30 mph (48 km/h), we recommend you
drive to the nearest Service Center as soon as possible to have the problem diagnosed
and corrected.
- Charging System Light
• This light shows the status of the electrical charging system. If the charging system lightremains on, it means that the vehicle is experiencing a problem with the charging
system.
• We recommend you do not continue driving if the charging system light is on. Have the vehicle serviced immediately.
- Oil Pressure Warning Light
• This light indicates low engine oil pressure. If the light turns on while driving, stop thevehicle and shut off the engine as soon as possible. A chime will sound for four minutes
when this light turns on.
• We recommend you do not operate the vehicle or engine damage will occur. Have the vehicle serviced immediately.
- Anti-Lock Brake (ABS) Light
• This light monitors the Anti-Lock Brake System (ABS).
• If the light is not on during starting, stays on, or turns on while driving, we recommendyou drive to the nearest Service Center and have the system serviced as soon as
possible.
- Electronic Throttle Control (ETC) Light
• This light informs you of a problem with the Electronic Throttle Control (ETC) system.
• If a problem is detected, the light will come on while the engine is running. Cycle theignition key when the vehicle has completely stopped and the shift lever is placed in the
PARK position; the light should turn off.
• If the light remains lit with the engine running, your vehicle will usually be drivable; however, see an authorized dealer for service as soon as possible. If the light is flashing
when the engine is running, immediate service is required and you may experience
reduced performance, an elevated/rough idle or engine stall and your vehicle may
require towing.
- Airbag Warning Light
• If the light is not on during starting, stays on, or turns on while driving, we recommendyou drive to the nearest Service Center and have the system serviced as soon as
possible.
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WHAT TO DO IN EMERGENCIES

Fuel Cap/Loose Gas Cap Message
• If a “gas cap” message (shown as gASCAP) appears, tighten the gas cap until a “clicking”sound is heard.
• Press the odometer reset button to turn the message off.
• If the message continues to appear for more than three days after tightening the gas cap, see your authorized dealer.
Oil Change Indicator
Message
• If an “oil change” message (shown as CHAngE OIL) appears and a single chime sounds,it is time for your next required oil change.
Resetting The Light After Servicing
• Turn the ignition switch to the ON/RUN position (do not start engine).
• Fully depress the accelerator pedal three times within 10 seconds.
• Turn the ignition switch to the OFF/LOCK position.
IF YOUR ENGINE OVERHEATS
• In any of the following situations, you can reduce the potential for overheating by takingthe appropriate action.
• On the highways — slow down.
• In city traffic — while stopped, shift transmission into NEUTRAL, but do not increase engine idle speed.
NOTE: There are steps that you can take to slow down an impending overheat condition:
• If your air conditioner (A/C) is on, turn it off. The A/C system adds heat to the engine cooling system and turning the A/C off can help remove this heat.
• You can also turn the Temperature Control to maximum heat, the Mode Control to floor and the Fan Control to high. This allows the heater core to act as a supplement to the
radiator and aids in removing heat from the engine cooling system.
• If the temperature reading does not return to normal, turn the engine off immediately.
• We recommend that you do not operate the vehicle or engine damage will occur. Have the vehicle serviced immediately.
CAUTION!
Driving with a hot cooling system could damage your vehicle. If the temperature
gauge reads HOT (H), pull over and stop the vehicle. Idle the vehicle with the air
conditioner turned off until the pointer drops back into the normal range. If the
pointer remains on HOT (H), and you hear continuous chimes, turn the engine off
immediately and call for service.
WHAT TO DO IN EMERGENCIES
44

WARNING!
You or others can be badly burned by hot engine coolant (antifreeze) or steam from
your radiator. If you see or hear steam coming from under the hood, do not open the
hood until the radiator has had time to cool. Never try to open a cooling system
pressure cap when the radiator or coolant bottle is hot.
JACKING AND TIRE CHANGING
WARNING!
• Do not attempt to change a tire on the side of the vehicle close to moving traffic.Pull far enough off the road to avoid the danger of being hit when operating the
jack or changing the wheel.
• Getting under a jacked-up vehicle is dangerous. The vehicle could slip off the jack and fall on you. You could be crushed. Never get any part of your body under a
vehicle that is on a jack. If you need to get under a raised vehicle, take it to a
service center where it can be raised on a lift.
• The jack is designed to use as a tool for changing tires only. The jack should not be used to lift the vehicle for service purposes. The vehicle should be jacked on a
firm, level surface only. Avoid ice or slippery areas.
Jack Location
• The jack and lug wrench are located in the rear storage compartment.
Spare Tire Stowage
• Remove the tire cover, if equipped, and remove the lug nuts with the lug wrench turning
them counterclockwise. Remove wheel lock if equipped.
45
WHAT TO DO IN EMERGENCIES

Preparations For Jacking
• Park on a firm, level surface. Avoid ice or slippery areas.
• Set the parking brake and shift the automatic transmission into PARK, or a manualtransmission into REVERSE.
• Turn the ignition to LOCK and turn on the Hazard Warning flasher. • Block both the front and rear of the wheeldiagonally opposite of the jacking position.
For example, if changing the right front tire,
block the left rear wheel.
NOTE: Passengers should not remain in the
vehicle when the vehicle is being jacked.
Jacking And Tire Changing Instructions
WARNING!
Carefully follow these tire changing procedures to help prevent personal injury or
damage to your vehicle: Always park on a firm, level surface as far from the edge of
the roadway as possible before raising the vehicle.
• Remove the spare tire, jack and tools from the stored location.
• Loosen (but do not remove) the wheel lug nuts by turning them to the left one turn while the wheel is still on the ground.
• Assemble the jack and jacking tools. Connect the jack handle driver to the extension, then to the lug wrench.
• Operate the jack from the front or the rear of the vehicle. Place the jack under the axle tube. Do not raise the vehicle until you are sure the jack is fully engaged.
WHAT TO DO IN EMERGENCIES
46

• Raise the vehicle by turning the jack screw tothe right. Raise the vehicle only until the tire
just clears the surface and enough clearance
is obtained to install the spare tire.
WARNING!
Raising the vehicle higher than necessary can make the vehicle less stable and
cause an accident. It could slip off the jack and hurt someone near it. Raise the
vehicle only enough to remove the tire.
• Remove the lug nuts and wheel.
• Position the spare wheel/tire on the vehicle and install the lug nuts with the cone-shaped end toward the wheel. Lightly tighten the lug nuts clockwise. To avoid the risk of forcing
the vehicle off the jack, do not tighten the nuts fully until the vehicle has been lowered.
• Lower the vehicle by turning the jack screw to the left, and remove the jack and wheel blocks.
• Finish tightening the lug nuts. Push down on the wrench while tightening for increased leverage. Alternate nuts until each one has been tightened twice. The correct wheel nut
tightness is 95 ft lbs (130 N•m). If in doubt about the correct tightness, have them
checked with a torque wrench by your authorized dealer or at a service station.
WARNING!
A loose tire or jack, thrown forward in a collision or hard stop, could endanger the
occupants of the vehicle. Always stow the jack parts and the spare tire in the places
provided.
• Secure the tire, jack, and tools in their proper locations.
47
WHAT TO DO IN EMERGENCIES

JUMP-STARTING
• If your vehicle has a discharged battery it can be jumpstarted using a set of jumpercables and a battery in another vehicle or by using a portable battery booster pack.
• Jump-starting can be dangerous if done improperly so please follow the procedures in this section carefully.
NOTE: When using a portable battery booster pack follow the manufacturer’s operating
instructions and precautions.
CAUTION!
Do not use a portable battery booster pack or any other booster source with a
system voltage greater than 12 Volts or damage to the battery, starter motor,
alternator or electrical system may occur.
WARNING!
When temperatures are below the freezing point, electrolyte in a discharged battery
may freeze. Do not attempt jump-starting because the battery could rupture or
explode and cause personal injury. Battery temperature must be brought above
freezing point before attempting a jump-start.
Preparations for Jump-Start
• The battery in your vehicle is located in the front of the engine compartment, behind the left headlight assembly.
WHAT TO DO IN EMERGENCIES
48