2004 JEEP WRANGLER tow

ONBOARD DIAGNOSTIC SYSTEM Ð OBD II
Your vehicle is equipped with a sophisticated onboard
diagnostic system called OBD II. This system monitors
the performance of the emissions, engine, and automatic
transmission control systems. When these systems are
operating properly, your vehicle will provide excellent
performance and fuel economy, as well as engine emis-
sions well within current government regulations.
If any of these systems require service, the OBD II system
will turn on the ªMalfunction Indicator Light.º It will
also store diagnostic codes and other information to
assist your service technician in making repairs. Al-
though your vehicle will usually be drivable and not
need towing, see your dealer for service as soon as
possible.CAUTION!
²Prolonged driving with the ªMalfunction Indica-
tor Lightº on could cause further damage to the
emission control system. It could also affect fuel
economy and driveability. The vehicle must be
serviced before any emissions tests can be per-
formed.
²If the ªMalfunction Indicator Lightº is flashing
while the engine is running, severe catalytic con-
verter damage and power loss will soon occur.
Immediate service is required.
MAINTAINING YOUR VEHICLE 225
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CAUTION!
Overfilling or underfilling the crankcase will cause
aeration or loss of oil pressure. This could damage
your engine.
Change Engine Oil
Road conditions as well as your kind of driving affect the
interval at which your oil should be changed. Check the
following to determine if any apply to you:
²Day or night temperatures are below 32ÉF (0ÉC)
²Stop and go driving
²Extensive engine idling
²Driving in dusty conditions
²Short trip driving of less than 10 miles (16.2 km)
²More than 50% of your driving is at sustained high
speeds during hot weather, above 90ÉF (32ÉC)
²Taxi, Police, or delivery service (commercial service)
²Trailer towing
²Off-road or desert driving
²If equipped for and operating with E±85 (ethanol) fuel
IfANYof these apply to you, then change your engine oil
at every interval shown in schedule ªBº of the ªMainte-
nance Schedulesº section of this manual.
If none of these apply to you, then change your engine oil
at every interval shown on schedule ªAº of the ªMain-
tenance Schedulesº section of this manual
NOTE:Under no circumstances should oil change
intervals exceed 6,000 miles (10 000 km) or 6 months
whichever comes first.
MAINTAINING YOUR VEHICLE 229
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WARNING!
A hot exhaust system can start a fire if you park over
materials that can burn. Such materials might be
grass or leaves coming into contact with your ex-
haust system. Do not park or operate your vehicle in
areas where your exhaust system can contact any-
thing that can burn.
In unusual situations involving grossly malfunctioning
engine operation, a scorching odor may suggest severe
and abnormal catalyst overheating. If this occurs, stop
the vehicle, turn off the engine and allow it to cool.
Service, including a tune up to manufacturer's specifica-
tions, should be obtained immediately.
To minimize the possibility of catalytic converter dam-
age:
²Do not shut off the engine or interrupt the ignition
when the transmission is in gear and the vehicle is in
motion.
²Do not try to start the engine by pushing or towing the
vehicle.
²Do not idle the engine with any spark plug wires
disconnected or removed, such as when diagnostic
testing.
²Do not idle the engine for prolonged periods during
very rough idle or malfunctioning operating condi-
tions.
²Do not allow vehicle to run out of fuel.
NOTE:Intentional tampering with emissions control
systems can result in civil penalties being assessed
against you.
Engine Timing Belt Ð 2.4L Engine
Replace the engine timing belt at the intervals described
in the appropriate maintenance schedule.
Ignition Wiring System Ð 2.4L Engine
Replace the ignition cables at the intervals described in
the appropriate maintenance schedule.
MAINTAINING YOUR VEHICLE 233
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²Use MopartTouch Up Paint on scratches or chips as
soon as possible. Your authorized dealer has touch up
paint to match the color of your vehicle.
²Aluminum wheels should be cleaned regularly with
mild soap and water to prevent corrosion. To remove
heavy soil, select a non-abrasive, non-acidic cleaner.
Do not use scouring pads or metal polishes. Avoid
automatic car washes that use acidic solutions or harsh
brushes that may damage the wheels' protective fin-
ish.
Interior Care
Use MopartFabric Cleaner to clean fabric upholstery
and carpeting.
Use MopartVinyl Cleaner to clean vinyl or leather
upholstery.
MopartVinyl Cleaner is specifically recommended for
interior vinyl trim.
WARNING!
Do not use volatile solvents for cleaning purposes.
Many are potentially flammable, and if used in
closed areas they may cause respiratory harm.
Glass Surfaces
All glass surfaces should be cleaned on a regular basis
with any commercial household-type glass cleaner.
Never use an abrasive type cleaner. Use caution when
cleaning inside rear windows equipped with electric
defrosters. Do not use scrapers or other sharp instru-
ments which may scratch the elements.
When cleaning the rear view mirror, spray cleaner on the
towel or rag that you are using. Do not spray cleaner
directly on the mirror.
Carpet
Vacuum your carpet regularly to prevent a soil build-up.
Shampoo soiled carpet with a reliable upholstery cleaner,
using a natural sponge or soft bristle brush. After carpet
dries, vacuum it thoroughly.
252 MAINTAINING YOUR VEHICLE

To access the fuse panel the glove box must be removed.
It is removed by slipping the glove box strap off the hook
and letting the door roll down off its hinges. To reinstall,
position the glove box door at an 8 o'clock orientation,
engage the hinge hook formations on the lower edge of
the glove box door with the hinge pins on the lower edge
of the instrument panel. Tilt the upper edge of the glove
box door upward toward the instrument panel enough to
reattach the glove box strap to the door. Rotate glove box
door to closed position. Open and close to insure proper
installation.
Cavity Fuse Description
1 20 Amp Yellow Park Lights, Skim
(Sentry Key)
2 20 Amp Yellow Stop Lights
3 20 Amp Yellow Subwoofer System
4 10 Amp Red Door Switch Defeat
5 10 Amp Red Airbag
6 20 Amp Yellow Rear Wiper
7 10 Amp Red Back-Up Lights, Rear Win-
dow Defroster Relay, ABS
8 10 Amp Red HEVAC
Cavity Fuse Description
9 10 Amp Red Airbag
10 10 Amp Red Instrument Cluster
11 10 Amp Red Solenoids, DRL
12 10 Amp Red Power Distribution Relays,
Skim (Sentry Key)
13 10 Amp Red Turn Signals
14 10 Amp Red Radio
15 10 Amp Red HBL (Rear Window De-
froster) Switch
16 10 Amp Red Headlamp Aim (Export
Only)
17 25 Amp Natu-
ralFront Wiper
18 20 Amp Yellow Cigar Lighter
19 20 Amp Yellow Spare
20 20 Amp Yellow Transmission: Manual -
Clutch Interlock Switch By-
pass Automatic - Ignition
Starter Circuit
MAINTAINING YOUR VEHICLE 255
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Chassis
Component Fluid, Lubricant, or Genuine Part
Automatic Transmission MopartATF+4 Automatic Transmission Fluid.
Manual Transmission MopartManual Transmission Lubricant or equivalent.
Transfer Case MopartATF+4 Automatic Transmission Fluid.
Axle Differential (front-rear) MopartHypoid Gear Lubricant (SAE 80W-90) (API GL5) or equivalent. For
trailer towing, use a SAE 75W-140 Synthetic Gear Lubricant. Models
equipped with Trac-Lok require an additive.
Brake Master Cylinder MopartDOT 3, SAE J1703 should be used. If DOT 3, SAE J1703 brake fluid
is not available, then DOT 4 is acceptable. Use only recommended brake flu-
ids.
Power Steering Reservoir MopartATF+4 Automatic Transmission Fluid.
Steering Gear & Linkage, Ball
Joints, Prop Shafts & Yokes, Wheel
BearingsMopartMulti-Purpose Lubricant NLGI Grade 2 EP, GC-LB
260 MAINTAINING YOUR VEHICLE

EMISSION CONTROL SYSTEM MAINTENANCE
The ªScheduledº maintenance services, listed inbold
typemust be done at the times or mileages specified to
assure the continued proper functioning of the emission
control system. These, and all other maintenance services
included in this manual, should be done to provide best
vehicle performance and reliability. More frequent main-
tenance may be needed for vehicles in severe operating
conditions such as dusty areas and very short trip
driving.
Inspection and service also should be done any time a
malfunction is suspected.
NOTE:Maintenance, replacement, or repair of the
emission control devices and systems on your vehicle
may be performed by any automotive repair establish-
ment or individual using any automotive part which has
been certified pursuant to U.S. EPA or, in the State of
California, California Air Resources Board regulations.
MAINTENANCE SCHEDULES
There are two maintenance schedules that show the
requiredservice for your vehicle.
First is Schedule(B(. It is for vehicles that are operated
under the conditions that are listed below and at the
beginning of the schedule.
²Day or night temperatures are below 32ÉF (0ÉC)
²Stop and go driving
²Excessive engine idling
²Driving in dusty conditions
²Short trips of less than 10 miles (16.2 km)
²More than 50% of your driving is at sustained high
speeds during hot weather, above 90ÉF (32ÉC)
²Trailer towing
²Taxi, police, or delivery service (commercial service)
²Off-road or desert driving
²If equipped for and operated with E-85 (ethanol)
fuel.
262 MAINTENANCE SCHEDULES
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Schedule ªBº
Follow this schedule if you usually operate your vehicle
under one or more of the following conditions.
²Day or night temperatures are below 32ÉF (0ÉC)
²Stop and go driving
²Excessive engine idling
²Driving in dusty conditions
²Short trips of less than 10 miles (16.2 km)
²More than 50% of your driving is at sustained high
speeds during hot weather, above 90ÉF (32ÉC)
²Trailer towing
²Taxi, police, or delivery service (commercial service)
²Off-road or desert driving
²If equipped for and operated with E-85 (ethanol)
fuel.
Miles 3,000 6,000 9,000 12,000 15,000
(Kilometers) (5 000) (10 000) (14 000) (19 000) (24 000)
Change the engine oil and engine oil filter. X X X X X
Inspect the engine air filter element, replace if
necessary.X
Lubricate the steering linkage tie rod ends. X X X X X
Lubricate the steering and suspension ball joints. X X
Inspect the brake linings. X
Drain and refill the front and rear axle fluid³ X
SCHEDULE ªBº 265
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