2006 JEEP GRAND CHEROKEE catalytic converter

engine start. If the bulb does not come on when turning
the key from OFF to ON, have the condition checked
promptly.
Certain conditions such as a loose or missing gas cap,
poor fuel quality, etc. may illuminate the light after
engine start. The vehicle should be serviced if the light
stays on through several of your typical driving cycles. In
most situations the vehicle will drive normally and will
not require towing.
The Malfunction Indicator Light flashes to alert you to
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 297 for more information.)6. Airbag Warning Light
This light turns on and remains on for 6 to 8
seconds as a bulb check when the ignition
switch is first turned ON. If the light is not on
during starting, stays on, or turns on while
driving, have the system inspected by an authorized
dealer as soon as possible.
7. Anti-Lock Brake Warning Light
This light monitors the Anti-Lock Brake System.
The light will turn on when the ignition switch is
turned to the ON position and may stay on for as long as
four seconds.
If the ABS light remains on or turns on while driving, it
indicates that the Anti-Lock portion of the brake system
is not functioning and that service is required. However,
the conventional brake system will continue to operate
normally if the BRAKE warning light is not on.
UNDERSTANDING YOUR INSTRUMENT PANEL 177
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•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 are 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 are 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
engine running for an extended period. If the vehicle is
stopped in an open area with the engine running for
more than a short period, adjust the ventilation system
to force fresh, outside air into the vehicle.
STARTING AND OPERATING 271
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WARNING!
Jump starting can be dangerous. To avoid personal
injury or damage to electrical components in vehicle,
observe the following warnings:
•Battery fluid is a corrosive acid solution and can burn
or even blind you. Don’t allow battery fluid to contact
your eyes, skin, or clothing. Don’t lean over a battery
when attaching clamps. If acid splashes in eyes or on
skin, flush the area immediately with large amounts of
water.
•Do not use a booster battery or any other booster
source that has a greater than 12–volt system, i.e., do
not use a 24–volt power source.
•Never attempt to jump start a discharged battery that
is frozen, because it could rupture or explode during
jump starting.
•Be sure your vehicle is not touching the jump start
vehicle.
•Observe all Battery Warnings in Section 7 of this
manual, while jump starting your vehicle.
WARNING!
Do not attempt to push or tow your vehicle to get it
started. Unburned fuel could enter the catalytic
converter and, once the engine has started, ignite and
damage the converter and vehicle.
WHAT TO DO IN EMERGENCIES 291
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MAINTAINING YOUR VEHICLE
CONTENTS

6.1L Engine...........................296

Onboard Diagnostic System — OBD II........297
▫Loose Fuel Filler Cap Message............297

Emissions Inspection And Maintenance
Programs............................298

Replacement Parts......................299

Dealer Service.........................300

Maintenance Procedures..................300
▫Engine Oil..........................301▫Engine Oil Filter......................304
▫Drive Belts — Check Condition And
Tensioner...........................304
▫Spark Plugs.........................305
▫Engine Air Cleaner Filter................305
▫Fuel Filter..........................305
▫Catalytic Converter....................306
▫Maintenance-Free Battery................307
▫Air Conditioner Maintenance.............309
7

Catalytic Converter
The catalytic converter requires the use of unleaded fuel
only. Leaded gasoline will destroy the effectiveness of the
catalyst as an emission control device.
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 the
vehicle.
NOTE:Intentional tampering with emissions control
systems can result in civil penalties being assessed
against you.
306 MAINTAINING YOUR VEHICLE

Emergency Starting..................... 289
Keyless Transmitter Replacement (RKE)....... 24
Saving Feature (Protection)............... 120
Bearings.............................. 324
Belts, Drive............................ 304
Belts, Seat.............................. 33
Body Mechanism Lubrication............... 311
B-Pillar Location........................ 252
Brake Assist System...................... 132
Brake Control System, Electronic............. 130
Brake System........................... 319
Anti-Lock (ABS)....................131,243
Fluid Check.......................... 321
Hoses.............................. 320
Parking............................. 241
Warning Light........................ 176
Brake/Transmission Interlock............... 237
Break-In Recommendations, New Vehicle........ 69
Bulb Replacement.....................334,335Capacities, Fluid........................ 341
Caps, Filler
Fuel................................ 272
Radiator (Coolant Pressure)............... 316
Car Washes............................ 325
Carbon Monoxide Warning............70,152,271
Cargo Area Cover....................... 164
Cargo Area Features...................... 163
Cargo Compartment...................... 163
Light............................... 163
Cargo Light............................ 163
Cargo Load Floor........................ 167
Cargo Tie-Downs........................ 165
Catalytic Converter...................... 306
Caution, Exhaust Gas..................... 152
CD (Compact Disc) Player................. 198
Cellular Phone.......................... 82
Center High Mounted Stop Light............ 340
Chart, Tire Sizing........................ 249
INDEX 375
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