2008 JEEP LIBERTY fuel

Loose Fuel Filler Cap Message
If the vehicle diagnostic system determines that the fuel
filler cap in loose, improperly installed, or damaged, a
ªgASCAPº message will display in the instrument clus-
ter. Tighten the gas cap until a ªclickingº sound is heard.
This is an indication that the gas cap is properly tight-
ened. Press the trip odometer reset button to turn off the
message. If the problem persists, the message will appear
the next time the vehicle is started. This might indicate a
damaged cap. If the problem is detected twice in a row,
the system will turn on the Malfunction Indicator Light
(MIL). Resolving the problem will turn the MIL light off.
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 Light)
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.
400 MAINTAINING YOUR VEHICLE

Change Engine Oil
The oil change indicator system will remind you that it is
time to take your vehicle in for scheduled maintenance.
Refer to ªMaintenance Scheduleº in Section 8 of this
manual for information on this system.
NOTE: Under no circumstances should oil change
intervals exceed 6,000 miles (10 000 km) or 6 months,
whichever occurs first.
Engine Oil Selection
For best performance and maximum protection under all
types of operating conditions, the manufacturer recom-
mends engine oils that are API Certified and meet the
requirements of DaimlerChrysler Material Standard MS-
6395.
American Petroleum Institute (API) Engine Oil
Identification Symbol
This symbol means that the oil has
been certified by the American
Petroleum Institute (API). The
manufacturer only recommends
API Certified engine oils.
Engine Oil Viscosity
SAE 5W-20 engine oil is recommended for all operating
temperatures. This engine oil improves low temperature
starting and vehicle fuel economy.
The engine oil filler cap also shows the recommended
engine oil viscosity for your engine. For information on
engine oil filler cap location, refer to the ªEngine Com-
partmentº illustration in this section.
404 MAINTAINING YOUR VEHICLE

WARNING!
The air induction system (air cleaner, hoses, etc) can
provide a measure of protection in the case of engine
backfire. Do not remove the air induction system (air
cleaner, hoses, etc) unless such removal is necessary
for repair or maintenance. Make sure that no one is
near the engine compartment before starting the
vehicle with the air induction system (air cleaner,
hoses, etc) removed. Failure to do so can result in
serious personal injury.
Fuel Filter
A plugged fuel filter can cause stalling, limit the speed at
which a vehicle can be driven or cause hard starting.
Should an excessive amount of dirt accumulate in the
fuel tank, frequent filter replacement may be necessary.
See your authorized dealer for service.
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.
MAINTAINING YOUR VEHICLE 407
7

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 ignition coil connec-
tors disconnected for prolonged periods.
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.
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.
Maintenance-Free Battery
Your vehicle is equipped with a maintenance-free battery.
You will never have to add water, nor is periodic main-
tenance required.
MAINTAINING YOUR VEHICLE 409
7

²Keep the front of the radiator clean. If your vehicle is
equipped with air conditioning, keep the front of the
condenser clean, also.
²Do not change the thermostat for summer or winter
operation. If replacement is ever necessary, install
ONLY the correct type thermostat. Other designs may
result in unsatisfactory cooling performance, poor gas
mileage, and increased emissions.
Hoses and Vacuum/Vapor Harnesses
Inspect surfaces of hoses and nylon tubing for evidence
of heat and mechanical damage. Hard or soft spots,
brittle rubber, cracking, tears, cuts, abrasions, and exces-
sive swelling indicate deterioration of the rubber.
Pay particular attention to those hoses nearest to high
heat sources such as the exhaust manifold. Inspect hose
routing to be sure hoses do not touch any heat source or
moving component that may cause heat damage or
mechanical wear.Insure nylon tubing in these areas has not melted or
collapsed.
Inspect all hose connections such as clamps and cou-
plings to make sure they are secure and no leaks are
present.
Components should be replaced immediately if there is
any evidence of wear or damage that could cause failure.
Fuel System
The Electronic Fuel Injection high-pressure fuel system's
tubes, special connectors, connections, and clamps have
unique material characteristics that provide adequate
sealing and resist attack by deteriorated gasoline.
You are urged to use only the manufacture specified
tubes, connections, and clamps, or their equivalent in
material and specification, in any fuel system servicing.
MAINTAINING YOUR VEHICLE 421
7

Cavity Cartridge
FuseMini
FuseDescription
J3 40 Amp
GreenÐ Rear Door Modules
J4 25 Amp
WhiteÐ Driver Door Node
J5 25 Amp
WhiteÐ Passenger Door Node
J6 40 Amp
GreenÐ Anti-Lock Brake Sys-
tem (ABS) Pump/ESP
- if equipped
J7 30 Amp
PinkÐ Anti-Lock Brake Sys-
tem (ABS) Valve/ESP
- if equipped
J8 40 Amp
GreenÐ Power Seats - if
equipped
J9 40 Amp
GreenÐ PZEV/Flex Fuel - if
equipped
J10 Ð Ð ÐCavity Cartridge
FuseMini
FuseDescription
J11ÐÐÐ
J13 60 Amp
YellowÐ Ignition Off Draw
(IOD)
J14 40 Amp
GreenÐ EBL (Rear Window
Defogger) - if
equipped
J15 Ð Ð Ð
J17 40 Amp
GreenÐ Starter Solenoid
J18 20 Amp
BlueÐ Powertrain Control
Module (PCM) Trans-
mission Relay
J19 60 Amp
YellowÐ Radiator Fan
J20 30 Amp
PinkÐ Front Wiper
MAINTAINING YOUR VEHICLE 437
7

Cavity Cartridge
FuseMini
FuseDescription
M17 Ð 15 Amp
BlueExterior Lighting Ð
Left Front Park &
Side Marker, Left Tail
& Running, License
Lights
M18 Ð 15 Amp
BlueExterior Lighting Ð
Right Front Park &
Side Marker, Right
Tail & Running Lights
M19 Ð 25 Amp
NaturalAuto Shut Down
(ASD) #1 & #2Cavity Cartridge
FuseMini
FuseDescription
M20 Ð 15 Amp
BlueInterior Lighting/
Steering Wheel
Switches - if
equipped/Switch
Bank/Electronic Ve-
hicle Information
Center (EVIC) - if
equipped
M21 Ð 20 Amp
YellowAuto Shut Down
(ASD) #3
M22 Ð 10 Amp
RedRight Horn (Hi/Low)
M23 Ð 10 Amp
RedLeft Horn (Hi/Low)
M25 Ð 20 Amp
YellowFuel Pump
440 MAINTAINING YOUR VEHICLE

FLUID CAPACITIES
U.S. Metric
Fuel (approximate)
3.7 Liter Engine 19.5 Gallons 73.8 Liters
Engine Oil-With Filter
SAE 5W-20, API Certified 5 Qts 4.7 Liters
Cooling System *
MopartAntifreeze/Coolant 5 Year/100,000 Mile Formula or equivalent. 14 Qts 13 Liters
* Includes heater and coolant recovery bottle filled to MAX level.
MAINTAINING YOUR VEHICLE 447
7