2005 JEEP WRANGLER ignition

MAINTAINING YOUR VEHICLE
CONTENTS

2.4L Engine...........................248

4.0L Engine...........................249

Onboard Diagnostic System — OBD II........250

Emissions Inspection And Maintenance
Programs............................251

Replacement Parts......................252

Dealer Service.........................252

Maintenance Procedures..................253
▫Engine Oil..........................253▫Drive Belts — Check Condition And Tension . . 257
▫Spark Plugs.........................258
▫Catalytic Converter....................258
▫Engine Timing Belt — 2.4L Engine.........260
▫Ignition Wiring System — 2.4L Engine......260
▫Crankcase Emission Control System........260
▫Fuel Filter..........................260
▫Engine Air Cleaner Filter................260
▫Maintenance-Free Battery................261
7

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
MAINTAINING YOUR VEHICLE 251
7

ignition key or start the engine. This means that your
vehicle’s OBD system isnot readyand you shouldnot
proceed 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.
If your OBD system isnot ready,you should see your
authorized dealer or repair facility. If your vehicle was
recently serviced or had a battery failure or replacement,
you may need to do nothing more than drive your
vehicle as you normally would in order for your OBD
system to update. A recheck with the above test routine
may then indicate that the system is now ready.
Regardless of whether your vehicle’s OBD system is
ready or not ready, if the MIL symbol is illuminated
during normal vehicle operation, you should have yourvehicle serviced before going to the I/M station. The I/M
station can fail your vehicle because the MIL symbol is on
with the engine running.
REPLACEMENT PARTS
Use of genuine Moparparts for normal/scheduled
maintenance and repairs is highly recommended to in-
sure the designed performance. Damage or failures
caused by the use of non-Moparparts for maintenance
and repairs will not be covered by the manufacturer’s
warranty.
DEALER SERVICE
Your dealer has the qualified service personnel, special
tools and equipment to perform all service operations in
an expert manner. Service Manuals are available which
include detailed service information for your vehicle.
Refer to these manuals before attempting any procedure
yourself.
252 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:
•Do not shut off the engine or interrupt the ignition
when the transmission is in gear and the vehicle is in
motion.
•Do not try to start the engine by pushing or towing the
vehicle.
•Do not idle the engine with any spark plug wires
disconnected or removed, such as when diagnostic
testing.
•Do not idle the engine for prolonged periods during
very rough idle or malfunctioning operating condi-
tions.
•Do not allow vehicle to run out of fuel.
NOTE:Intentional tampering with emissions control
systems can result in civil penalties being assessed
against you.
MAINTAINING YOUR VEHICLE 259
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Engine Timing Belt — 2.4L Engine
Replace the engine timing belt at the intervals described
in the appropriate maintenance schedule.
Ignition Wiring System — 2.4L Engine
Replace the ignition cables at the intervals described in
the appropriate maintenance schedule.
Crankcase Emission Control System
Proper operation of this system depends on freedom
from sticking or plugging due to deposits. As vehicle
mileage builds up, the PCV valve and passages may
accumulate deposits. If a valve is not working properly,
replace it with a new valve. DO NOT ATTEMPT TO
CLEAN THE OLD PCV VALVE!
Check ventilation hose for indication of damage or
plugging deposits. Replace if necessary.
Fuel Filter
A plugged fuel filter can cause hard starting or limit the
speed at which a vehicle can be driven. Should an
excessive amount of dirt accumulate in the fuel tank,
frequent replacement of the fuel filter which is mounted
in the fuel tank may be necessary.
Engine Air Cleaner Filter
Under normal driving conditions, replace the air filter at
the intervals shown on “Maintenance Schedule A.” If,
however, you drive the vehicle frequently under dusty or
severe conditions, the filter element should be inspected
periodically and replaced if necessary at the intervals
shown on “Maintenance Schedule B.”
260 MAINTAINING YOUR VEHICLE

Cavity Fuse/Color Description
13 40 Amp Green Accessories
14 Open
15 50 Amp Red IOD
16 Open
17 20 Amp Yellow Power
18 20 Amp Yellow Horn
19 20 Amp Yellow Fog Lights
20 15 Amp Lt. Blue Radio
21 10 Amp Red A/C Clutch
22 25 Amp Natural Ignition Switch
23 20 Amp Yellow Fuel
24 20 Amp Yellow Off Road
25 Open
26 10 Amp Red Accessories
27 20 Amp Yellow MFSW
28 10 Amp Red Clutch OverrideCavity Fuse/Color Description
29 Relay ASD
30 Relay A/C Clutch
31 Relay Transmission
32 Relay Starter
33 Relay ABS
34 Open
35 Relay Fog Lamp
36 Relay Horn
37 Relay Fuel Pump
38 Relay HBL (Rear Window De-
froster)
39 Relay Front Differential Locker
(Rubicon) or High Speed
Fan (2.4L Engines)
40 Relay Rear Differential Locker
(Rubicon) or Low Speed
Fan (2.4L Engines)
MAINTAINING YOUR VEHICLE 289
7

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:
•Remove Cartridge fuse #15 in the Power Distribution
Center labeled Ignition-Off Draw (IOD).
•Store the removed IOD fuse in the Power Distribution
Center location #11 labeled “IOD Storage.”
•Or, disconnect the negative cable from the battery.
•Anytime 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.
REPLACEMENT BULBS — IF EQUIPPED
Interior Lights Bulb Type
Auto. Trans. Indicator Light................. 658
Courtesy Lights, Under Dash (1).............. 906
Heater Control Lights (2)................... 194
Rocker Switch Indicator Light
(Rear Window Defogger, and Rear Wash/Wipe).... **
Soundbar Dome Light..................... 912
** Bulbs only available from authorized dealer.
Instrument Cluster Bulb Type
Telltale (High Beam)....................... 74
Illumination............................ 103
Exterior Lights Bulb Type
Backup Lights (2)........................1156
Center High Mounted Stop Light (1).... 921orW16W
290 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, if not
replaced at 3 months.X X XXX
Rotate the tires. X X X
Inspect the engine air filter element, replace if
necessary.X
Inspect the PCV Valve, and replace if necessary.X
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 fluid‡ X X
Drain and refill the automatic transmission fluid,
and change filter.†X
SCHEDULE “B” 307
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