catalytic converter JEEP WRANGLER 2006 TJ / 2.G Owners Manual

Certain conditions such as a loose or missing gas cap,
poor quality fuel, etc. may illuminate the light after
engine start. The vehicle should be serviced if the light
stays on through several typical driving styles. In most
situations, the vehicle will drive normally and will not
require towing.
When the engine is running, the “Malfunction Indicator
Light” may flash to alert serious conditions that could
lead to immediate loss of power or severe catalytic
converter damage. The vehicle should be serviced as
soon as possible if this occurs. (See page 268 for more
information.)
18. Trip Odometer Button
Press and release this button to toggle between the
odometer and trip odometer displays. This button is also
used to reset the trip odometer to 0. While the display is
showing the trip odometer, press and hold the button for
approximately 2 seconds and the display will reset to 0. 19. Odometer/Trip Odometer
The odometer shows the total distance the vehicle has
been driven.
The odometer will “illuminate” when the driver’s door
has been opened, and will remain on for 20 seconds after
exiting the vehicle.
U.S. federal regulations require that upon transfer of
vehicle ownership, the seller certify to the purchaser the
correct mileage that the vehicle has been driven. There-
fore, if the odometer reading is changed during repair or
replacement, be sure to keep a record of the reading
before and after the service so the correct mileage can be
determined.
The trip odometer shows individual mileage up to 999.9
miles (1 600 km). To switch from odometer to trip
odometer, press the trip odometer button.
150 UNDERSTANDING YOUR INSTRUMENT PANEL

Fuel System Cautions
CAUTION!
Follow these guidelines to maintain your vehicle’s
performance:
•The use of leaded gas is prohibited by Federal law.
Using leaded gasoline can impair engine performance,
damage the emission control system.
•An out-of-tune engine, or certain fuel or ignition
malfunctions, can cause the catalytic converter to
overheat. If you notice a pungent burning odor or
some light smoke, your engine may be out of tune or
malfunctioning and may require immediate service.
Contact your dealer for service assistance.
•The use of fuel additives which are now being sold as
octane enhancers is not recommended. Most of these
products contain high concentrations of methanol. Fuel system damage or vehicle performance problems
resulting from the use of such fuels or additives is not
the responsibility of the manufacturer.
NOTE: Intentional tampering with emissions control
systems can result in civil penalties being assessed
against you.
Carbon Monoxide Warnings
WARNING!
Carbon monoxide (CO) in exhaust gases is deadly.
Follow the precautions below to prevent carbon
monoxide poisoning:
•Do not inhale exhaust gases. They contain carbon
monoxide, a colorless and odorless gas which can kill.
Never run the engine in a closed area, such as a
garage, and never sit in a parked vehicle with the
232 STARTING AND OPERATING

MAINTAINING YOUR VEHICLE
CONTENTS

2.4L Engine ...........................266

4.0L Engine ...........................267

Onboard Diagnostic System — OBD II ........268

Emissions Inspection And Maintenance
Programs ............................269

Replacement Parts ......................270

Dealer Service .........................270

Maintenance Procedures ..................271
▫ Engine Oil ..........................271 ▫
Drive Belts — Check Condition And Tension . . 275
▫ Spark Plugs .........................275
▫ Catalytic Converter ....................275
▫ Engine Timing Belt — 2.4L Engine .........277
▫ Ignition Wiring System — 2.4L Engine ......277
▫ Crankcase Emission Control System ........277
▫ Fuel Filter ..........................278
▫ Engine Air Cleaner Filter ................278
▫ Maintenance-Free Battery ................278
7

Engine Oil Filter Selection
All of the manufacturer’s engines have a full-flow type
disposable oil filter. Use a filter of this type for replace-
ment. The quality of replacement filters varies consider-
ably. Only high quality filters should be used to assure
most efficient service. Mopar engine oil filters are high
quality oil filters and are recommended.
Drive Belts — Check Condition and Tension
At the mileage shown in the appropriate “Maintenance
Schedule,” check all drive belts for condition and proper
tension. Improper belt tension can cause belt slippage
and failure.
Inspect the drive belt for evidence of cuts, cracks, or
glazing and replace them if there is any sign of damage
which could result in belt failure. If adjustment is re-
quired, adjust the belts according to the specifications
and procedures shown in the Service Manual. Special tools are required to properly measure tension
and to restore belt tension to factory specifications. Also,
check belt routing to make sure there is no interference
between the belts and other engine components.
Spark Plugs
Spark plugs must fire properly to assure engine perfor-
mance and emission control. New plugs should be in-
stalled at the mileage specified in the appropriate main-
tenance chart. The entire set should be replaced if there is
any malfunction due to a faulty spark plug.
Refer to the “Vehicle Emission Control Information” label
in the engine compartment for spark plug information.
Catalytic Converter
The catalytic converter requires the use of unleaded fuel
only. Leaded gasoline will destroy the effectiveness of the
converter as an emission control device.
MAINTAINING YOUR VEHICLE 275
7

Under normal operating conditions, the catalytic con-
verter will not require maintenance. However, it is im-
portant to keep the engine properly tuned to assure
proper catalyst operation and prevent possible catalyst
damage.
CAUTION!
Damage to the catalytic converter can result if your
vehicle is not kept in proper operating condition. In
the event of engine malfunction, particularly involv-
ing engine misfire or other apparent loss of perfor-
mance, have your vehicle serviced promptly. Contin-
ued operation of your vehicle with a severe
malfunction could cause the converter to overheat,
resulting in possible damage to the converter and
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.
276 MAINTAINING YOUR VEHICLE

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 conditions.
•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.
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.
MAINTAINING YOUR VEHICLE 277
7

Emergency Starting..................... 258
Voltmeter ............................ 147
Belts, Drive ............................ 275
Belts, Seat .............................. 20
Body Mechanism Lubrication ............... 282
B-Pillar Location ........................ 217
Brake System ........................... 290
Anti-Lock (ABS) ....................... 205
Hoses .............................. 290
Master Cylinder ....................... 291
Parking ............................. 200
Warning Light ........................ 151
Brakes ............................... 203
Brake/Transmission Interlock ............... 189
Break-In Recommendations, New Vehicle ........ 44
Bulb Replacement ..................... 309,310
Calibration, Compass ...................... 54
Capacities, Fluid ........................ 314 Caps, Filler
Fuel ................................ 233
Power Steering ........................ 281
Car Washes ............................ 298
Carbon Monoxide Warning ................. 232
Carpeting ............................. 301
Catalytic Converter ...................... 275
Caution, Exhaust Gas ...................... 45
CD (Compact Disc) Changer ................ 158
CD (Compact Disc) Player .........154,157,160,163
CD (Compact Disc) Player Maintenance ........ 171
Cellular Phone .......................... 172
Center High Mounted Stop Light ............ 313
Chains, Tire ............................ 228
Changing A Flat Tire ..................... 254
Chart, Tire Sizing ........................ 214
Check Engine Light
(Malfunction Indicator Light) .............149,269
Child Restraint ...................... 34,39,42
INDEX 349
10

Child Restraint Tether Anchors.............38,39
Climate Control ......................... 172
Clock ................................ 152
Clutch Interlocking Ignition System ........182,187
Compact Disc (CD) Maintenance ............. 171
Compass .............................. 52
Compass Calibration ...................... 54
Compass Variance ........................ 55
Console ............................... 74
Console, Floor ........................... 74
Contract, Service ........................ 342
Converter, Catalytic ...................... 275
Cooling System ......................... 284
Adding Coolant (Antifreeze) .............. 286
Coolant Capacity ...................... 314
Coolant Level ......................... 288
Disposal of Used Coolant ................ 287
Drain, Flush, and Refill .................. 285
Inspection ........................... 284 Points to Remember
.................... 288
Pressure Cap ......................... 287
Selection of Coolant (Antifreeze) .........285,314
Temperature Gauge ..................... 149
Corrosion Protection ..................... 297
Crankcase Emission Control System .......... 277
Cruise Control (Speed Control) ............... 69
Cruise Light ........................... 147
Cup Holder ............................ 72
Customer Assistance ..................... 340
Daytime Running Lights ................... 66
Dealer Service .......................... 270
Defroster, Rear Window ................... 139
Defroster, Windshield .................. 174,177
Delay (Intermittent) Wipers ................. 67
Deploying, Airbag ........................ 32
Diagnostic System, Onboard ................ 268
Dimmer Switch, Headlight .................. 65
350 INDEX