2007 JEEP LIBERTY check engine light

If using a manual transmission vehicle for trailer towing,
all starts must be in FIRST gear to avoid excessive clutch
slippage.
Towing Tips — Automatic Transmission
The “D” range can be selected when towing. However, if
frequent shifting occurs while in this range, the “3” range
should be selected.
NOTE:Using the “3” range while operating the vehicle
under heavy operating conditions will improve perfor-
mance and extend transmission life by reducing exces-
sive shifting and heat build up. This action will also
provide better engine braking.
The automatic transmission fluid and filter should be
changed if you REGULARLY tow a trailer for more than
45 minutes of continuous operation. See Schedule “B” in
section 8 of this manual for transmission fluid change
intervals.NOTE:Check the automatic transmission fluid level
before towing.
Towing Tips — O/D OFF (If Equipped)
To reduce potential for automatic transmission overheat-
ing, press the “O/D OFF” button when driving in hilly
areas or shift the transmission to Drive position 2 on
more severe grades. Refer to “Transmission Shifting” in
this section.
Towing Tips — Electronic Speed Control (If
Equipped)

Don’t use in hilly terrain or with heavy loads.
When using the speed control, if you experience speed
drops greater than 10 mph (16 km/h), disengage until
you can get back to cruising speed.
Use speed control in flat terrain and with light loads to
maximize fuel efficiency.
STARTING AND OPERATING 295
5

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 maynotbe ready if your vehicle was recently
serviced, if you recently had a dead battery, or a batteryreplacement. 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:
318 MAINTAINING YOUR VEHICLE

Once a Month
•Check the tire pressure and look for unusual wear or
damage.
•Inspect the battery and clean and tighten the terminals
as required.
•Check the fluid levels of the coolant reservoir, brake
master cylinder, and transmission, and add as needed.
•Check all lights and all other electrical items for correct
operation.At Each Oil Change
•Change the engine oil filter.
•Inspect the exhaust system.
•Inspect brake hoses.
•Check the coolant level, hoses, and clamps.
•After completion of off-road operation, the underside
of the vehicle should be thoroughly inspected. Exam-
ine threaded fasteners for looseness.
372 MAINTENANCE SCHEDULES
8
M
A
I
N
T
E
N
A
N
C
E
S
C
H
E
D
U
L
E
S

ABS (Anti-Lock Brake System)............168,241
Adding Fuel........................... 277
Adding Washer Fluid..................... 157
Air Cleaner, Engine (Engine Air Cleaner Filter) . . . 324
Air Conditioner Maintenance............... 329
Air Conditioning........................ 203
Air Conditioning, Operating Tips............ 205
Air Conditioning Refrigerant............... 330
Air Conditioning System.................. 203
AirFilter .............................. 324
Air Pressure, Tires....................... 254
Airbag................................ 49
Airbag Deployment....................... 61
Airbag Light....................... 54,64,173
Airbag Maintenance....................... 63
Airbag, Window (Side Curtain)............... 50
Alarm, Panic............................ 24
Alarm (Security Alarm).................... 19
Alignment and Balance................... 260Alterations/Modifications, Vehicle............. 9
Antenna, Satellite Radio................... 199
Antifreeze (Engine Coolant)................ 366
Anti-Lock Brake System (ABS)............126,241
Anti-Lock Warning Light.................. 168
Appearance Care........................ 347
Arming Theft System (Security Alarm)......... 20
Auto Down Power Windows................ 32
AutomaticDimmingMirror ................. 82
Automatic Door Locks..................... 29
Automatic Transmission................221,345
Adding Fluid......................... 346
Fluid and Filter Changes................. 345
Fluid Level Check...................... 345
FluidType ........................... 345
Gear Ranges.......................... 221
Shifting ............................. 221
Special Additives...................... 346
Torque Converter...................... 225
400 INDEX

Catalytic Converter...................... 325
Caution, Exhaust Gas................... 74,144
CD (Compact Disc) Changer..........181,182,194
CD (Compact Disc) Player.........177,180,184,187
CD (Compact Disc) Player Maintenance........ 202
Cellular Phone........................ 85,202
Center High Mounted Stop Light............ 365
Certification Label....................... 280
Chains, Tire............................ 260
Changing A Flat Tire..................... 304
Charging System Light.................... 169
Chart, Tire Sizing........................ 246
Check Engine Light
(Malfunction Indicator Light)............... 318
Child Restraint...................... 64,69,71
Child Restraint Tether Anchors............. 68,69
Child Safety Locks........................ 30
Climate Control......................... 203
Clock .............................176,192Clutch Interlocking Ignition System........ 211,216
Command-Trac Operation.................. 226
Compact Disc (CD) Maintenance............. 202
Compass.............................. 141
Compass Calibration..................... 141
Compass Variance....................... 141
Computer, Trip/Travel.................... 139
Console, Overhead....................... 133
Contract, Service........................ 394
Converter, Catalytic...................... 325
Cooling System......................... 333
Adding Coolant (Antifreeze).............. 335
Coolant Capacity...................... 366
Coolant Level......................... 337
Disposal of Used Coolant................ 337
Drain, Flush, and Refill.................. 334
Inspection........................... 333
Points to Remember.................... 337
Pressure Cap......................... 336
402 INDEX

Filters
Air Cleaner.......................... 324
Engine Oil........................... 323
Engine Oil Disposal.................... 323
FinishCare ............................ 348
Flashers
Hazard Warning....................... 302
Turn Signal.....................166,363,365
Flooded Engine Starting................... 213
Fluid Capacities......................... 366
Fluid Leaks............................. 76
Fluid Level Checks....................... 76
Automatic Transmission................. 345
Clutch Fluid.......................... 342
Engine Oil........................... 320
Manual Transmission................... 344
Power Steering........................ 330
Fluids, Lubricants and Genuine Parts.......... 367
Fog Light Service........................ 364Fog Lights.......................... 118,364
Folding Rear Seat........................ 113
Four Wheel Drive....................... 226
Operation........................... 226
Shifting ..........................228,232
Systems..........................226,229
Four-Way Hazard Flasher.................. 302
FrontAxle(Differential) ................... 342
Fuel................................. 273
Filler Cap (Gas Cap).................... 277
Gasoline............................ 273
Gauge.............................. 173
Hoses.............................. 339
Materials Added....................... 275
Octane Rating........................ 273
Requirements......................273,366
System Hoses......................... 339
Tank Capacity........................ 366
Fuel System Caution................275,278,279
INDEX 405
10

LATCH
(Lower Anchors and Tether for CHildren)..... 68,69
Lead Free Gasoline...................... 273
LifeofTires ............................ 258
Lights............................. 117,361
Airbag............................ 64,173
Anti-Lock........................... 168
Back-Up............................. 365
Battery Saver......................... 117
Brake Assist Warning.................132,175
Brake Warning........................ 171
Bulb Replacement...................... 362
Cargo .............................. 154
Center Mounted Stop................... 365
Cruise .............................. 170
Daytime Running...................... 118
Dimmer Switch, Headlight............. 117,119
Dome.............................. 134Electronic Stability Program (ESP)
Indicator...........................130,175
Electronic Throttle Control Warning......... 174
Fog ............................. 118,364
Four-Wheel Drive Indicator............... 167
Fuses............................... 353
Hazard Warning Flasher................. 302
Headlight Switch...................... 117
Headlights........................... 362
High Beam Indicator.................... 166
Instrument Cluster................... 117,118
Interior........................... 118,119
Lights On Reminder.................... 118
Low Fuel............................ 173
Malfunction Indicator (Check Engine)........ 168
Map Reading......................... 120
Oil Pressure.......................... 170
Passing............................. 119
Reading............................. 134
408 INDEX

Rear Servicing........................ 365
Rear Tail............................ 365
Seat Belt Reminder..................... 173
Security Alarm (Theft Alarm).............. 172
Sentry Key........................... 172
Service.............................. 362
Side Marker.......................... 365
Tire Pressure Monitoring (TPMS)........... 166
Traction Control....................130,175
Transfer Case......................171,172
Transmission Warning................... 171
Turn Signal............... 117,119,166,363,365
Warning (Instrument Cluster Description)..... 166
Loading Vehicle......................... 280
Tires ............................... 249
Locks................................. 26
Automatic Door........................ 29
Child Protection........................ 30
Door.............................. 26,28Power Door........................... 29
Steering Wheel......................... 16
Lower Anchors and Tether for CHildren
(LATCH)............................ 68,69
Lubrication, Body....................... 331
Luggage Carrier......................... 159
Luggage Rack (Roof Rack)................. 159
Maintenance Free Battery.................. 327
Maintenance Procedures................... 320
Maintenance Schedule.................... 370
Schedule “A”......................... 385
Schedule “B”......................... 373
Maintenance Schedules.................... 370
Maintenance, Sunroof..................... 150
Malfunction Indicator Light (Check Engine) . . 168,318
Manual, Service......................... 396
Manual Transmission..................216,344
Fluid Level Check...................... 344
INDEX 409
10