2006 JEEP LIBERTY fuel cap

inflate them to the proper pressure. Driving on a signifi-
cantly under-inflated tire causes the tire to overheat and
can lead to tire failure. Under-inflation also reduces fuel
efficiency and tire tread life, and may affect the vehicle’s
handling and stopping ability.
Please note that the TPMS is not a substitute for proper
tire maintenance, and it is the driver ’s responsibility to
maintain correct tire pressure, even if under-inflation has
not reached the level to trigger illumination of the TPMS
low tire pressure telltale. (See page 268 for more infor-
mation.)
6. 4LO Mode Indicator Light — If Equipped This light alerts the driver that the vehicle is in
the 4 LO four–wheel drive mode. The front and
rear driveshafts are mechanically locked to-
gether forcing the front and rear wheels to
rotate at the same speed. (See page 234 for more infor-
mation.) 7. Fog Light Indicator Light — If Equipped
This light shows when the front fog lights are on.
8. Malfunction Indicator Light This light is part of an onboard diagnostic system
called OBD II which monitors engine and auto-
matic transmission control systems. This light
will illuminate when the ignition is in the ON position
before engine start. If the bulb does not come on when
turning the ignition key from OFF to ON, have the
condition checked promptly.
Certain conditions such has 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 typical driving cycles. In most
situations, the vehicle will drive normally and will not
require towing.
174 UNDERSTANDING YOUR INSTRUMENT PANEL

Also, the light will come on when the parking brake is
applied with the ignition switch in the ON position.
NOTE: This light shows only that the parking brake is
applied. It does not show the degree of brake application.
If the parking brake is off and the light remains on, have
the brake system inspected as soon as possible.
19. Full Time Indicator Light — If Equipped This light alerts the driver that the vehicle is in
the FULL TIME four–wheel drive mode, and
employs the inter-axle differential which al-
lows the front and rear wheels to rotate at
different speeds. (See page 234 for more information.)
20. Sentry Key/Security Alarm Indicator Light — If
Equipped
Refer to “Sentry Key Immobilizer System” or “Vehicle
Security Alarm” in Section 2 of this manual for more
information. 21. Fuel Gage
When the ignition key is in the ON position, the pointer
will show the level of fuel remaining in the fuel tank. A
small arrow indicates the side of the vehicle where the
filler cap (gas cap) is located.
22. Low Fuel Warning Light
When the fuel level reaches approximately 2.3 U.S.
Gallons (8.7 Liters) this light will come on and
remain on until fuel is added. The “Low Fuel
Warning Light” may turn on and off again, especially
during and after hard braking, accelerations, or turns.
This occurs due to the shifting of the fuel in the tank.
Also, a single chime will sound.
23. Airbag Warning Light This indicator lights and remains lit for 6 to 8
seconds when the ignition is first turned on. If the
UNDERSTANDING YOUR INSTRUMENT PANEL 179
4

▫Replacement Tires .....................266
▫ Alignment And Balance .................267

Tire Pressure Monitor System (TPMS) —
If Equipped ...........................268
▫ Base System .........................268
▫ Premium System ......................270
▫ General Information ...................274

Tire Chains ...........................274

Tire Rotation Recommendations ............275

Fuel Requirements (Gasoline Engines) ........276
▫ Reformulated Gasoline .................277
▫ Gasoline/Oxygenate Blends ..............277
▫ MMT In Gasoline .....................278 ▫
Materials Added To Fuel ................278
▫ Fuel System Cautions ..................278
▫ Carbon Monoxide Warnings ..............279

Fuel Requirements (Diesel Engines) ..........280

Fuel Tank Filler Cap (Gas Cap) .............281
▫ Loose Fuel Filler Cap Message ............282

Trailer Towing .........................282
▫ Common Towing Definitions .............283
▫ Trailer Hitch Classification ...............285
▫ Trailer Towing Weights
(Maximum Trailer Weight Ratings) .........285
▫ Trailer And Tongue Weight ..............287
▫ Towing Requirements ..................288
STARTING AND OPERATING 215
5

FUEL TANK FILLER CAP (GAS CAP)
CAUTION!
•To avoid fuel spillage and overfilling, do not “top
off” the fuel tank after filling.
•DO NOT put gasoline in your diesel vehicle (if
equipped). If you accidentally put gasoline in
your vehicle, DO NOT start the engine. This will
cause damage to the fuel system. Have the fuel
system flushed.
The gas cap is located behind the fuel filler door, on the
left side of the vehicle. If the gas cap is lost or damaged,
be sure the replacement cap has been designed for use
with this vehicle. When tightening the gas cap, tighten until 2 or 3 clicks
are heard to insure that the cap is properly seated.
Fuel Filler Cap
STARTING AND OPERATING 281
5

Loose Fuel Filler Cap Message
If the vehicle diagnostic system determines that the fuel
filler cap is loose, improperly installed, or damaged, a
“GAS CAP” message will be displayed in the odometer
(located on the instrument cluster). Replace, or tighten
the fuel filler cap properly to turn the message off (light
will time out). If the problem continues, the message will
appear the next time the vehicle is started. Refer to
“Onboard Diagnostic System — OBDII” in Section 7 of
this manual for more information. (See page 316 for more
information.)
CAUTION!
Damage to the fuel system or emission control
system could result from using an improper fuel
tank filler cap (gas cap). A poorly fitting cap could let
impurities into the fuel system.
WARNING!
•Never add fuel when the engine is running.
•Never have any smoking materials lit in or near
the vehicle when the fuel cap is removed or the
tank filled.
TRAILER TOWING
In this section you will find safety tips and information
on limits to the type of towing you can reasonably do
with your vehicle. Before towing a trailer carefully re-
view this information to tow your load as efficiently and
safely as possible.
To maintain warranty coverage, follow the requirements
and recommendations in this manual concerning ve-
hicles used for trailer towing.
282 STARTING AND OPERATING

MAINTAINING YOUR VEHICLE
CONTENTS

3.7L Engine ...........................314

2.8L Turbo Diesel Engine .................315

Onboard Diagnostic System — OBD II ........316
▫ Loose Fuel Filler Cap Message ............316

Emissions Inspection And Maintenance
Programs ............................317

Replacement Parts ......................318

Dealer Service .........................318

Maintenance Procedures ..................319 ▫
Engine Oil ..........................319
▫ Drive Belts — Check Condition And Tension . . 323
▫ Spark Plugs .........................324
▫ Catalytic Converter ....................324
▫ Crankcase Emission Control System ........326
▫ Air Cleaner Filter .....................326
▫ Maintenance-Free Battery ................326
▫ Air Conditioner Maintenance .............327
▫ Power Steering Fluid Check ..............328
7

ONBOARD DIAGNOSTIC SYSTEM — 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 “Malfunction Indicator Light.” 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!
•Prolonged driving with the “Malfunction Indica-
tor Light” 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.
•If the “Malfunction Indicator Light” is flashing
while the engine is running, severe catalytic con-
verter damage and power loss will soon occur.
Immediate service is required.
Loose Fuel Filler Cap Message
If the vehicle diagnostic system determines that the fuel
filler cap is loose, improperly installed, or damaged, a
“GAS CAP” message will be displayed in the odometer
(located on the instrument cluster). Replace, or tighten
316 MAINTAINING YOUR VEHICLE

the fuel filler cap properly to turn the message off (light
will time out). If the problem continues, the message will
appear the next time the vehicle is started.
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 may notbe 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:
MAINTAINING YOUR VEHICLE 317
7