ignition JEEP WRANGLER 2004 TJ / 2.G Workshop Manual

MAINTAINING YOUR VEHICLE
CONTENTS
m2.4L Engine..........................223
m4.0L Engine..........................224
mOnboard Diagnostic System Ð OBD II......225
mEmissions Inspection And
Maintenance Programs
..................226
mReplacement Parts.....................227
mDealer Service........................227
mMaintenance Procedures.................228
NEngine Oil..........................228
NDrive Belts Ð Check Condition And Tension . . 231
NSpark Plugs.........................232
NCatalytic Converter....................232NEngine Timing Belt Ð 2.4L Engine.........233
NIgnition Wiring System Ð 2.4L Engine......233
NCrankcase Emission Control System........234
NFuel Filter..........................234
NEngine Air Cleaner Filter................234
NMaintenance-Free Battery................234
NAir Conditioner Maintenance.............235
NPower Steering Fluid Check..............236
NDriveline And Steering Component
Lubrication..........................237
NBody Lubrication.....................237
NWindshield Wiper Blades................237
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EMISSIONS INSPECTION AND MAINTENANCE
PROGRAMS
In some localities, it may be a legal requirement to pass
an inspection of your vehicle's emissions control system.
Failure to pass could prevent vehicle registration.
For states which have an I/M (Inspection and
Maintenance) requirement, this check verifies the
following: the MIL (Malfunction Indicator Lamp)
is functioning and is not on when the engine is running,
and that the OBD (On Board Diagnostic) system is ready
for testing.
Normally, the OBD system will be ready. The OBD
system maynotbe ready if your vehicle was recently
serviced, if you recently had a dead battery, or a battery
replacement. If the OBD system should be determined
not ready for the I/M test, your vehicle may fail the test.
Your vehicle has a simple ignition key actuated test
which you can use prior to going to the test station. To
check if your vehicle's OBD system is ready, you must do
the following:
1. Insert your ignition key into the ignition switch.2. Turn the ignition to the ON position, but do not crank
or start the engine.
3. If you crank or start the engine, you will have to start
this test over.
4. As soon as you turn your key to the ON position, you
will see your MIL symbol come on as part of a normal
bulb check.
5. Approximately 15 seconds later, one of two things will
happen:
a. The MIL will flash for about 10 seconds and then
return to being fully illuminated until you turn off
the ignition key or start the engine. This means that
your vehicle's OBD system isnot readyand you
shouldnotproceed to the I/M station.
b. The MIL will not flash at all and will remain fully
illuminated until you turn off the ignition key or
start the engine. This means that your vehicle's OBD
system isreadyand you can proceed to the I/M
station.
226 MAINTAINING YOUR VEHICLE

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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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
7

Underhood Fuses (Power Distribution Center)
Your vehicle is equipped with an electrical power distri-
bution center located in the engine compartment near the
battery. This power center houses plug-in ªCartridgeº
fuses, ISO relays, and Mini (Micro) fuses.
A label inside the latching cover of the center identifies
each component for ease of replacement, if necessary.
Cartridge and mini (micro) fuses can be obtained from
your authorized dealer.
VEHICLE STORAGE
If you are leaving your vehicle dormant for more than 21
days you may want to take steps to protect your battery.
You may:
²Remove Cartridge fuse #15 in the Power Distribution
Center labeled Ignition-Off Draw (IOD).
²Store the removed IOD fuse in the Power Distribution
Center location #11 labeled ªIOD Storage.º
²Or, disconnect the negative cable from the battery.
²Anytime you store your vehicle, or keep it out of
service (i.e. vacation) for two weeks or more, run the
air conditioning system at idle for about five minutes
in the fresh air and high blower setting. This will
insure adequate system lubrication to minimize the
possibility of compressor damage when the system is
started again.
256 MAINTAINING YOUR VEHICLE

Miles 48,000 51,000 54,000 57,000 60,000
(Kilometers) (77 000) (82 000) (86 000) (91 000) (96 000)
Change the engine oil and engine oil filter. X X X X X
Inspect the engine air filter element, replace if
necessary.X
Inspect the PCV Valve, and replace if necessary.LX
Inspect the ignition cables, and replace if neces-
sary (2.4L Only).X
Replace the spark plugs.X
Lubricate the steering linkage tie rod ends. X X X X X
Lubricate the steering and suspension ball joints. X X X
Inspect the brake linings. X X
Drain and refill the front and rear axle fluid³ X X
Drain and refill the automatic transmission fluid,
and change filter.X
Inspect the drive belt and replace as needed. Not
required if belt was previously.X
Drain and refill the transfer case fluid. X
268 SCHEDULE ªBº
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Miles 108,000 111,000 114,000 117,000 120,000
(Kilometers) (173 000) (178 000) (182 000) (187 000) (192 000)
Change the engine oil and engine oil filter. X X X X X
Inspect the engine air filter element, replace if
necessary.X
Inspect the PCV Valve, and replace if necessary.LX
Replace the spark plugs.X
Inspect the ignition cables, and replace if neces-
sary (2.4L Only).X
Lubricate the steering linkage tie rod ends. X X X X X
Lubricate the steering and suspension ball joints. X X X
Inspect the brake linings. X X
Drain and refill the front and rear axle fluid³ X X
Drain and refill the automatic transmission fluid,
and replace main sump filter.X
Inspect the drive belt and replace as needed. Not
required if belt was previously replaced.X
Drain and refill the transfer case fluid. X
Inspection and service should also be performed anytime
a malfunction is observed or suspected. Retain all re-
ceipts.LThis maintenance is recommended by the manufac-
turer to the owner, but is not required to maintain
emissions warranty.
272 SCHEDULE ªBº
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Miles 60,000 66,000 72,000 78,000
(Kilometers) (96 000) (106 000) (115 000) (125 000)
[Months] [60] [66] [72] [78]
Change the engine oil and engine oil filter. X X X X
Inspect the engine air filter element, and replace if nec-
essary.X
Inspect the PCV Valve, and replace if necessary.LX
Replace the ignition cables (2.4L Only).X
Replace the spark plugs.X
Lubricate the steering linkage joints and outer tie rod
ends.XXXX
Lubricate the steering and suspension ball joints. X X
Inspect the brake linings. X
Inspect the drive belt, and replace as needed. X
Inspect the drive belt, and replace as needed. Not re-
quired if belt was previously replaced.X
Flush and replace the engine coolant at 60 months, re-
gardless of mileage.X
Inspect transfer case fluid. X
276 SCHEDULE ªAº
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Miles 108,000 114,000 120,000
(Kilometers) (173 000) (182 000) (192 000)
[Months] [108] [114] [120]
Change the engine oil and engine oil filter. X X X
Inspect the engine air filter element, and replace if necessary.X
Replace the ignition cables (2.4L Only).X
Inspect the PCV Valve, and replace if necessary.LX
Replace the spark plugs.X
Lubricate the steering linkage joints and outer tie rod ends. X X X
Lubricate the steering and suspension ball joints. X X
Inspect the brake linings. X
Replace the timing belt (2.4L Only). X
Inspect the drive belt, and replace as needed. Not required if pre-
viously replaced.X
Drain and refill the transfer case fluid. X
Inspection and service should also be performed anytime
a malfunction is observed or suspected. Retain all re-
ceipts.LThis maintenance is recommended by the manufac-
turer to the owner, but is not required to maintain
emissions warranty.
278 SCHEDULE ªAº
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Hoses.............................. 243
Master Cylinder...................... 244
Parking............................ 175
Warning Light....................... 119
Brakes............................... 177
Brake/Transmission Interlock.............. 166
Break-In Recommendations, New Vehicle...... 39
Bulb Replacement...................... 257
Calibration, Compass..................... 47
Capacities, Fluid....................... 258
Caps, Filler
Fuel............................... 200
Power Steering....................... 236
Car Washes........................... 249
Carpeting............................. 252
Cassette Tape and Player Maintenance....... 148
Cassette Tape Player.........126,130,132,140,142
Catalytic Converter..................... 232
Caution, Exhaust Gas..................... 40
CD Changer........................133,138
CD Player......................128,135,137
CD Player Maintenance.................. 149Cellular Phone......................... 149
Chains, Tire........................... 196
Changing A Flat Tire.................... 213
Chart, Tire Sizing....................... 185
Check Engine Light..................... 118
Child Restraint.....................29,33,36
Child Restraint Tether Anchors............. 33
Cigar Lighter........................... 62
Climate Control........................ 149
Clock................................ 120
Clutch Interlocking Ignition System......160,165
Compact Disc Maintenance............... 149
Compact Disc Player.................... 140
Compass.............................. 46
Compass Calibration..................... 47
Compass Variance....................... 48
Console............................... 65
Console, Floor.......................... 65
Contract, Service....................... 282
Converter, Catalytic..................... 232
Cooling System........................ 239
Adding Coolant (Antifreeze)............. 241
Coolant Capacity..................... 258
INDEX 289
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