2012 JEEP LIBERTY check engine light

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 (MIL).” 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 authorized dealer for service as
soon as possible.CAUTION!
•Prolonged driving with the MIL on could cause
further damage to the emission control system. It
could also affect fuel economy and drivability. The
vehicle must be serviced before any emissions
tests can be performed.
•If the MIL is flashing while the engine is running,
severe catalytic converter 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
“gASCAP” message will display in the odometer or a
“CHECK gASCAP” message will be displayed in the
Electronic Vehicle Information Center (EVIC). Refer to
458 MAINTAINING YOUR VEHICLE

“Electronic Vehicle Information Center (EVIC)” in “Un-
derstanding Your Instrument Panel” for further informa-
tion. Tighten the gas cap until aclickingsound is heard.
This is an indication that the gas cap is properly tight-
ened.
Press the odometer reset button to turn the message off.
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 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 that require an Inspection and Mainte-
nance (I/M), this check verifies the “Malfunction
Indicator Light (MIL)” is functioning and is not
on when the engine is running, and that the OBD II
system is ready for testing.
Normally, the OBD II system will be ready. The OBD II
system may notbe ready if your vehicle was recently
serviced, recently had a dead battery or a battery replace-
ment. If the OBD II 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 II system is ready, you must
do the following:
1. Turn the ignition switch to the ON position, but do not
crank or start the engine.
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MAINTAINING YOUR VEHICLE 459

Once A Month
•Check 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 and the
brake master cylinder, add as needed.
•Check all lights and other electrical items for correct
operation.
At Each Oil Change
•Change the engine oil filter.
•Inspect the brake hoses and lines.
CAUTION!
•Failure to perform the required maintenance items
may result in damage to the vehicle.
•Proper operation of four-wheel drive vehicles de-
pends on tires of equal size, type and circumfer-
ence on each wheel. Any difference in tire size can
cause damage to the transfer case. Tire rotation
schedule should be followed to balance tire wear.
Required Maintenance Intervals
Refer to the Maintenance Schedules on the following
pages for the required maintenance intervals.
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S508 MAINTENANCE SCHEDULES

Bulbs, Light.......................... 92,498
Calibration, Compass ..................... 246
Capacities, Fluid ........................ 502
Caps, Filler Fuel .............................. 404
Oil (Engine) ........................ 464
Power Steering ...................... 350
Radiator (Coolant Pressure) ............. 476
Car Washes ............................ 487
Carbon Monoxide Warning ...............89,403
Cargo (Vehicle Loading) ................... 406
Cargo Area Cover ....................... 212
Cargo Area Features ...................... 208
Cargo Compartment ...................... 208
Light ............................. 164
Cargo Light ............................ 164
Cargo Load Floor ........................ 208
Cargo Tie-Downs ........................ 210 Cellular Phone
....................... 103,301
Certification Label ....................... 406
Changing A Flat Tire ..................... 435
Chart, Tire Sizing ........................ 369
Check Engine Light
(Malfunction Indicator Light) .............226,459
Checking Your Vehicle For Safety ............. 88
Checks, Safety ........................... 88
Child Restraint .................... 78,79,83,85
Child Restraint Tether Anchors .............82,83
Child Safety Locks ........................ 33
Clean Air Gasoline ....................... 400
Cleaning Wheels ............................ 489
Windshield Wiper Blades ............... 469
Climate Control ......................... 301
Clock ........................... 256,275,284
Coin Holder ........................... 207
Cold Weather Operation ................... 320
536 INDEX

FlashersHazard Warning ..................... 434
Turn Signal .............. 92,162,227,500,501
Flipper Glass, Liftgate ..................... 40
Flooded Engine Starting ................... 320
Floor Console .......................... 207
Fluid Capacities ......................... 502
Fluid Leaks ............................. 92
Fluid Level Checks .................... 482,483
Automatic Transmission ................ 480
Brake ............................. 479
Cooling System ...................... 473
Engine Oil ......................... 462
Power Steering ...................... 350
Fluid, Brake ........................... 504
Fluids, Lubricants and Genuine Parts .......... 503
Fog Light Service ........................ 500
Fog Lights .................... 158,161,227,500
Folding Rear Seat ........................ 149 Four Wheel Drive
Shifting ................... 333,335,339,341
Systems ........................ 333,339
Four Wheel Drive Operation ................ 333
Freeing A Stuck Vehicle ................... 448
Front Axle (Differential) ................... 483
Fuel ................................. 399
Additives .......................... 402
Clean Air .......................... 400
Ethanol ........................... 400
Filler Cap (Gas Cap) .................. 404
Gasoline ........................... 399
Gauge ............................ 224
Materials Added ..................... 402
Methanol .......................... 400
Octane Rating .................... 399,503
Requirements ....................... 399
Specifications ....................... 503
Tank Capacity ....................... 502
540 INDEX

Electronic Stability Program (ESP) Indicator . . 366
Engine Temperature Warning............ 231
Exterior ............................ 92
Fog ......................... 161,227,500
Four-Wheel Drive Indicator . . 230,231,233,336,342
Hazard Warning Flasher ............... 434
Headlight Switch ..................... 158
Headlights ...................... 158,499
Headlights On Reminder ............... 161
Headlights On With Wipers ..........160,170
High Beam ...................... 162,227
High Beam Indicator .................. 227
High Beam/Low Beam Select ............ 162
Hill Descent Control Indicator .........230,361
Illuminated Entry ..................... 20
Instrument Cluster ................. 158,224
Lights On Reminder .................. 161
Low Fuel .......................... 224
Malfunction Indicator (Check Engine) ...... 226Oil Pressure
........................ 229
Park .............................. 158
Passing ............................ 162
Rear Servicing ....................... 501
Rear Tail ........................... 501
Seat Belt Reminder ................... 236
Service ......................... 498,499
Service Engine Soon
(Malfunction Indicator) ................ 226
Side Marker ........................ 500
Tire Pressure Monitoring (TPMS) .......224,389
Tow/Haul Indicator .................. 230
Traction Control ..................... 366
Transfer Case ..................... 336,342
Turn Signal .............. 92,158,162,500,501
Vanity Mirror ....................... 102
Voltage ............................ 228
Warning (Instrument Cluster Description) . . . 224
Load Floor, Cargo ....................... 208
544 INDEX

Loading Vehicle......................... 406
Tires .............................. 373
Locks ................................. 30
Auto Unlock ......................... 32
Automatic Door ...................... 32
Child Protection ...................... 33
Door .............................. 30
Power Door ......................... 31
Low Tire Pressure System .................. 389
Lower Anchors and Tether for
CHildren (LATCH) ..................... 82,83
Lubrication, Body ....................... 468
Luggage Carrier ......................... 216
Lumbar Support ........................ 144
Maintenance Free Battery .................. 466
Maintenance Procedures ................... 461
Maintenance Schedule .................... 506
Maintenance, General ..................... 461 Maintenance, Sunroof
..................... 196
Malfunction Indicator Light (Check Engine) . . 226,459
Manual Transmission Lubricant Selection ................... 504
Manual, Service ......................... 529
Marker Lights, Side ...................... 500
Master Cylinder (Brakes) .................. 479
Memory Feature (Memory Seat) ............. 151
Memory Seat ........................... 151
Memory Seats and Radio .................. 151
Methanol ............................. 400
Mini-Trip Computer ...................... 244
Mirrors ................................ 99
Automatic Dimming .................. 100
Electric Powered ..................... 101
Electric Remote ...................... 101
Heated ............................ 102
Outside ........................... 101
Rearview ........................... 99
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INDEX 545