service indicator JEEP WRANGLER UNLIMITED 2013 User Guide

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
After fuel is added, the vehicle diagnostic system can
determine if the fuel filler cap is possibly loose, improp-
erly installed, or damaged. A “gASCAP” message will be
displayed in the odometer. Tighten the gas cap until a
 clicking  sound is heard. This is an indication that the562 MAINTAINING YOUR VEHICLE

gas cap is properly tightened. 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 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 not be 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.
7 MAINTAINING YOUR VEHICLE 563

REPLACEMENT BULBS
Interior Bulbs
Bulb Number
Automatic Transmission
Indicator Lamp 658
Heater Control Lamps (2) 194
Rocker Switch Indicator Lamp
(Rear Window Defogger, and
Rear Wash/Wipe) **
Soundbar Dome Lamp 912
** Bulbs only available from authorized dealer.
Exterior Bulbs
Bulb Number
Headlamps (2) H13
Front Park/Turn Signal Lamps (2) 3157 Bulb Number
Front Side Marker Lamps (2) 168
Fog Lamps PSX24W
Rear Stop/Tail/Turn Lamps (2) 3157
Center High-Mounted Stop
Lamp L.E.D.
Backup Lamps (2) 3157
License Lamp 194
NOTE:
Numbers refer to commercial bulb types that can be
purchased from your local authorized dealer.
If a bulb needs to be replaced, visit your authorized
dealer or refer to the applicable Service Manual.606 MAINTAINING YOUR VEHICLE

MAINTENANCE SCHEDULE
Your vehicle is equipped with an automatic oil change
indicator system. The oil change indicator system will
remind you that it is time to take your vehicle in for
scheduled maintenance.
Based on engine operation conditions, the oil change
indicator message will illuminate. This means that service
is required for your vehicle. Operating conditions such as
frequent short-trips, trailer tow, extremely hot or cold
ambient temperatures, and E85 fuel usage will influence
when the “Change Oil” or “Oil Change Required” message
is displayed. Severe Operating Conditions can cause the
change oil message to illuminate as early as 3,500 miles
(5,600 km) since last reset. Have your vehicle serviced as
soon as possible, within the next 500 miles (805 km).
On Electronic Vehicle Information Center (EVIC) equipped
vehicles, “Oil Change Required” will be displayed in the
EVIC and a single chime will sound, indicating that an oil
change is necessary. On Non-EVIC equipped vehicles, “Change Oil” will flash
in the instrument cluster odometer and a single chime
will sound, indicating that an oil change is necessary.
Your authorized dealer will reset the oil change indicator
message after completing the scheduled oil change. If a
scheduled oil change is performed by someone other than
your authorized dealer, the message can be reset by refer-
ring to the steps described under “Electronic Vehicle Infor-
mation Center (EVIC)/Oil Change Required” in “Under-
standing Your Instrument Panel” or under “Instrument
Cluster Description/Odometer/Trip Odometer” in “Under-
standing Your Instrument Panel” for further information.
NOTE: Under no circumstances should oil change inter-
vals exceed 10,000 miles (16,000 km) or twelve months,
whichever comes first.
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S 614 MAINTENANCE SCHEDULES

Chart, Tire Sizing ........................ .473
Check Engine Light
(Malfunction Indicator Light) ...............311
Checking Your Vehicle For Safety ...............99
Checks, Safety ............................99
Child Restraint ............................76
Child Safety Locks .........................40
Clean Air Gasoline ....................... .507
Cleaning
Wheels ............................. .593
Climate Control ......................... .391
Clock ................................. .337
Cold Weather Operation ....................411
Compact Disc (CD) Maintenance ............. .390
Compact Spare Tire ....................... .487
Compass .............................. .315
Compass Calibration ...................... .318
Compass Variance ........................ .317
Computer, Trip/Travel ..................... .315 Connector
UCI ............................... .382
Universal Consumer Interface (UCI) ........ .382
Console ............................... .189
Console, Floor .......................... .189
Contract, Service ......................... .627
Coolant Pressure Cap (Radiator Cap) .......... .580
Cooling System .......................... .577
Adding Coolant (Antifreeze) .............. .579
Coolant Capacity ...................... .610
Coolant Level ........................ .581
Disposal of Used Coolant ................ .581
Drain, Flush, and Refill ................. .578
Inspection ........................... .577
Points to Remember .................... .581
Pressure Cap ......................... .580
Radiator Cap ......................... .580
Selection of Coolant (Antifreeze) ........... .578
Corrosion Protection ...................... .591636 INDEX

Illuminated Entry .......................21
Instrument Cluster ..................... .167
Interior ............................. .171
Lights On Reminder .................... .170
Low Fuel ........................... .300
Oil Pressure ......................... .301
Passing ............................. .170
Rear Servicing ........................ .609
Rear Tail ............................ .609
Seat Belt Reminder ..................... .301
Security Alarm (Theft Alarm) ............. .305
Service ............................. .607
Side Marker ......................... .609
Theft Alarm (Security Alarm) ............. .305
Tire Pressure Monitoring (TPMS) ........... .306
Traction Control ....................... .468
Turn Signal .......................... .103
Voltage ............................. .300
Warning (Instrument Cluster Description) .... .300 Loading Vehicle ......................... .513
Tires ............................... .477
Locking Axle ........................... .433
Locks ..................................36
Automatic Door ........................39
Child Protection ........................40
Door ................................36
Power Door ...........................38
Lubrication, Body ........................ .572
Maintenance Free Battery ................... .570
Maintenance Procedures ................... .565
Maintenance Schedule ..................... .614
Malfunction Indicator Light (Check Engine) .......311
Manual, Service ......................... .630
Manual Transmission ..................... .414
Fluid Level Check ..................... .589
Lubricant Selection ..................... .588
Shift Speeds ......................... .415
10 INDEX 643

Recreational ......................... .532
Weight ............................. .519
Towing Assistance ........................ .130
Trac-Lok Rear Axle ....................... .432
Traction Control ......................... .457
Trailer Sway Control (TSC) ................. .469
Trailer Towing .......................... .515
Cooling System Tips ................... .531
Hitches ............................. .518
Minimum Requirements ................. .525
Trailer and Tongue Weight ............... .524
Wiring ............................. .529
Trailer Towing Guide ...................... .519
Trailer Weight ........................... .519
Transfer Case ........................... .589
Four-Wheel-Drive Operation .............. .428
Maintenance ......................... .589
Transmission ........................... .585
Automatic ........................... .420 Manual ............................. .414
Range Indicator ....................... .306
Shifting ............................. .418
Transmitter Battery Service
(Remote Keyless Entry) ....................27
Tread Wear Indicators ..................... .490
Trip Computer .......................... .315
Trip Odometer .......................... .308
Trip Odometer Reset Button ................. .306
Turn Signals ............................ .169
UCI Connector .......................... .382
Uconnect™ (Hands-Free Phone) ...............114
Uniform Tire Quality Grades ................ .631
Universal Consumer Interface (UCI) Connector . . . .382
Unleaded Gasoline ....................... .506
Untwisting Procedure, Seat Belt ................55
Upholstery Care ......................... .594650 INDEX