check engine light JEEP WRANGLER 2012 JK / 3.G User Guide

the message will appear the next time the vehicle is
started. This might indicate a damaged cap. If the prob-
lem is detected twice in a row, the system will turn on the
MIL. Resolving the problem will turn the MIL 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.
2. If you crank or start the engine, you will have to start
this test over.
3. As soon as you turn the ignition switch to the ON
position, you will see the MIL symbol come on as part of
a normal bulb check.
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MAINTAINING YOUR VEHICLE 515

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 coolant reservoir, brake
master cylinder, power steering and transmission and
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.
•Check the manual transmission fluid level.
CAUTION!
Failure to perform the required maintenance items
may result in damage to the vehicle.
Required Maintenance Intervals
Refer to the Maintenance Schedules on the following
pages for the required maintenance intervals.
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S566 MAINTENANCE SCHEDULES

ABS (Anti-Lock Brake System)............272,417
Adding Engine Coolant (Antifreeze) .......... 532
Adding Fuel ........................... 465
Air Cleaner, Engine (Engine Air Cleaner Filter) . . . 520
Air Conditioner Maintenance ............... 522
Air Conditioning ........................ 354
Air Conditioning Controls ................. 354
Air Conditioning Filter .................365,523
Air Conditioning Refrigerant ............... 523
Air Conditioning System ................354,358
Air Conditioning, Operating Tips ............ 366
Air Filter .............................. 520
Air Pressure, Tires ....................... 444
Airbag ................................ 58
Airbag Deployment ....................... 67
Airbag Light ..................... 65,69,87,273
Airbag Maintenance ....................... 69
Airbag, Side ............................ 65
Alarm (Security Alarm) .................... 19 Alarm Light
........................... 274
Alterations/Modifications, Vehicle ............. 9
Antenna, Satellite Radio ................317,342
Anti-Lock Brake System (ABS) .............. 417
Anti-Lock Warning Light .................. 272
Antifreeze (Engine Coolant) ................ 559
Appearance Care ........................ 541
Arming Theft System (Security Alarm) ......... 19
Assistance Towing ....................... 114
Auto Down Power Windows ................ 40
Automatic Door Locks ..................... 37
Automatic Oil Change Indicator ............. 292
Automatic Temperature Control (ATC) ......... 358
Automatic Transmission ................382,537
Fluid and Filter Changes ............... 537
Fluid Level Check .................... 538
Fluid Type ......................... 537
Special Additives ..................... 537
Autostick ............................. 389
592 INDEX

Auxiliary Electrical Outlet (Power Outlet)...... 162
Auxiliary Power Outlet ................... 162
Axle Lock ............................. 395
Battery ............................... 521
Keyless Transmitter Replacement (RKE) ..... 25
Belts, Seat ............................ 46,87
Body Mechanism Lubrication ............... 526
Brake Assist System ...................... 420
Brake Control System, Electronic ............. 419
Brake System ........................... 535
Anti-Lock (ABS) ..................... 417
Master Cylinder ..................... 535
Parking ........................... 414
Warning Light ....................... 271
Brake/Transmission Interlock ............... 382
Break-In Recommendations, New Vehicle ........ 84
Bulb Replacement ..................... 555,556
Bulbs, Light ............................ 89 Calibration, Compass
.................. 286,295
Capacities, Fluid ........................ 559
Caps, Filler Fuel .............................. 465
Power Steering ...................... 413
Car Washes ............................ 542
Carbon Monoxide Warning ...............86,464
Cargo (Vehicle Loading) ................... 466
Cargo Light ............................ 154
Cellular Phone ........................ 99,354
Center High Mounted Stop Light ............ 558
Certification Label ....................... 466
Chains, Tire ............................ 452
Changing A Flat Tire ..................... 493
Chart, Tire Sizing ........................ 434
Check Engine Light
(Malfunction Indicator Light) .............280,515
Checking Your Vehicle For Safety ............. 85
Checks, Safety ........................... 85
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INDEX 593

FiltersAir Cleaner ......................... 520
Air Conditioning .................. 365,523
Engine Oil ......................... 520
Finish Care ............................ 542
Flashers Hazard Warning ..................... 492
Turn Signal ................. 89,270,557,558
Flooded Engine Starting ................... 373
Fluid Capacities ......................... 559
Fluid Leaks ............................. 89
Fluid Level Checks ...................... 541
Automatic Transmission ................ 537
Engine Oil ......................... 518
Manual Transmission .................. 540
Power Steering ...................... 413
Fluids, Lubricants and Genuine Parts .......... 560
Fog Light Service ........................ 557
Fog Lights .......................... 152,557Fold and Tumble Rear Seat
................. 144
Folding Rear Seat ........................ 146
Folding Windshield ...................... 253
Four Wheel Drive ....................... 390
Shifting ........................... 392
Four Wheel Drive Operation ................ 390
Four-Way Hazard Flasher .................. 492
Freeing A Stuck Vehicle ................... 505
Front Axle (Differential) ................... 541
Fuel ................................. 460
Ethanol ........................... 461
Filler Cap (Gas Cap) .................. 465
Gasoline ........................... 460
Gauge ............................ 269
Materials Added ..................... 462
Methanol .......................... 461
Octane Rating ....................... 460
Requirements ....................... 559
Tank Capacity ....................... 559
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INDEX 597

Lane Change and Turn Signals.............. 270
Lane Change Assist ...................... 152
Lap Belts .............................. 46
Lap/Shoulder Belts ....................... 46
LATCH
(Lower Anchors and Tether for CHildren) .....76,78
Latches ................................ 89
Lead Free Gasoline ...................... 460
Leaks, Fluid ............................ 89
Light Bulbs ............................. 89
Lights .............................. 89,149
Airbag ...................... 65,69,87,273
Alarm ............................ 274
Anti-Lock .......................... 272
Anti-Lock Warning ................... 272
Back-Up ........................... 558
Brake Assist Warning .................. 429
Brake Warning ...................... 271
Bulb Replacement .................... 556 Cargo ............................. 154
Center Mounted Stop
.................. 558
Check Engine (Malfunction Indicator) ...... 280
Cruise ............................ 275
Daytime Running .................... 153
Dimmer Switch, Headlight .............. 152
Electronic Stability Program (ESP) Indicator . . 429
Electronic Throttle Control Warning ....... 283
Exterior ............................ 89
Fog ............................ 152,557
Hazard Warning Flasher ............... 492
Headlight Switch ..................... 150
Headlights ......................... 556
High Beam ......................... 270
High Beam Indicator .................. 270
Hill Descent Control Indicator ........... 431
Illuminated Entry ..................... 20
Instrument Cluster ................... 150
Interior ............................ 154
600 INDEX

Lights On Reminder.................. 152
Low Fuel .......................... 269
Oil Pressure ........................ 270
Passing ............................ 152
Rear Servicing ....................... 558
Rear Tail ........................... 558
Seat Belt Reminder ................... 269
Security Alarm (Theft Alarm) ............ 274
Service ............................ 556
Side Marker ........................ 558
Theft Alarm (Security Alarm) ............ 274
Tire Pressure Monitoring (TPMS) ......... 275
Traction Control ..................... 429
Turn Signal .............. 89,151,270,557,558
Voltage ............................ 269
Warning (Instrument Cluster Description) . . . 269
Loading Vehicle ......................... 466
Tires .............................. 438
Locking Axle ........................... 395 Locks
Automatic Door ...................... 37
Child Protection ...................... 38
Door .............................. 34
Power Door ......................... 36
Lower Anchors and Tether for
CHildren (LATCH) ..................... 76,78
Lubrication, Body ....................... 526
Maintenance Free Battery .................. 521
Maintenance Procedures ................... 517
Maintenance Schedule .................... 564
Malfunction Indicator Light (Check Engine) . . 280,515
Manual Transmission .................. 376,539
Fluid Level Check .................... 540
Lubricant Selection ................... 539
Shift Speeds ........................ 377
Manual, Service ......................... 587
Master Cylinder (Brakes) .................. 535
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INDEX 601