check engine light JEEP GRAND CHEROKEE 2010 WK / 3.G User Guide

WARNING!
•Never have any smoking materials lit in or near
the vehicle when the gas cap is removed or the
tank filled.
•Never add fuel when the engine is running. This is
in violation of most state and federal fire regula-
tions and will cause the malfunction indicator
light to turn on.
•A fire may result if gasoline is pumped into a
portable container that is inside of a vehicle. You
could be burned. Always place gas containers on
the ground while filling.
NOTE:
•When the fuel nozzle “clicks” or shuts off, the fuel
tank is full.
•Tighten the gas cap about one-quarter turn until you
hear one click. This is an indication that the cap is
properly tightened.
•If the gas cap is not tighten properly, the MIL will
come on. Be sure the gas cap is tightened every time
the vehicle is refueled.
Loose Fuel Filler Cap Message
If the vehicle diagnostic system determines that the fuel
filler cap is loose, improperly installed, or damaged, a
“CHECK GASCAP” message will be displayed in the
EVIC (Electronic Vehicle Information Center). Refer to
“Electronic Vehicle Information Center (EVIC)” in “Un-
derstanding Your Instrument Panel” for further informa-
tion. Tighten the fuel filler cap until a “clicking” sound is
heard. This is an indication that the fuel filler cap is
properly tightened. Refer to “Onboard Diagnostic Sys-
tem” in “Maintaining Your Vehicle” for further
information.
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STARTING AND OPERATING 321

Towing Tips
Before setting out on a trip, practice turning, stopping
and backing the trailer in an area away from heavy
traffic.
Automatic Transmission
The DRIVE range can be selected when towing. How-
ever, if frequent shifting occurs while in this range, the
TOW/HAUL mode (if equipped), or a lower gear range,
should be selected.
NOTE:Using the TOW/HAUL mode (if equipped) or
selecting a lower gear range (using the Electronic Range
Select (ERS) feature) while operating the vehicle under
heavy operating conditions, will improve performance
and extend transmission life by reducing excessive shift-
ing and heat buildup. This action will also provide better
engine braking. The transmission fluid and filter should be changed if
you REGULARLY tow a trailer for more than 45 minutes
of continuous operation. Refer to “Maintenance Sched-
ule” for the proper maintenance intervals.
NOTE:
Check the transmission fluid level before towing
(5.7L engine).
Electronic Speed Control – If Equipped

Do not 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.
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STARTING AND OPERATING 337

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 loose, improperly
installed, or damaged. A “CHECK GASCAP” message
will be displayed in the EVIC. Refer to “Electronic Vehicle
Information Center (EVIC)” in “Understanding Your
Instrument Panel” for further information. Tighten the
7
MAINTAINING YOUR VEHICLE 365

gas cap until aclickingsound is heard. This is an
indication that the gas cap is properly tightened.
The message will remain displayed until the vehicle
diagnostic system can retest the fuel system. The test will
perform the next time the vehicle is started, if the vehicle
was keyed off above 40°F (4°C) outside temperature and
the following vehicle start is above 40°F (4°C) outside
temperature. It may be possible to have a message that
will not clear due to the test being disabled due to low
outside temperatures. If the test is performed and the
problem is gone, the message will disappear.
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 off. See your authorized dealer for service.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.
366 MAINTAINING YOUR VEHICLE

•Change your engine oil more often if you drive your
vehicle off-road for an extended period of time.
•Under no circumstances should oil change intervals
exceed 6,000 miles (10,000 km) or 6 months, whichever
comes first.
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
referring to the steps described under “Electronic Vehicle
Information Center (EVIC)/Oil Change Required” in
“Understanding Your Instrument Panel” for further in-
formation.
At Each Stop for Fuel
•Check the engine oil level about five minutes after a
fully warmed engine is shut off. Checking the oil level
while the vehicle is on level ground will improve the accuracy of the oil level reading. Add oil only when
the level is at or below the ADD or MIN mark.
•Check the windshield washer solvent and add if
required.
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, brake
master cylinder, power steering and transmission
(5.7L only) and add as needed.
•Check all lights and other electrical items for correct
operation.8
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SMAINTENANCE SCHEDULES 419

ABS (Anti-Lock Brake System).............. 268
Adding Fuel ........................... 320
Adjustable Pedals ........................ 115
Air Cleaner, Engine (Engine Air Cleaner Filter) . . . 372
Air Conditioner Maintenance ............... 374
Air Conditioning ........................ 224
Air Conditioning, Operating Tips ............ 231
Air Conditioning Refrigerant ............... 375
Air Conditioning System .................. 224
Air Filter .............................. 372
Air Pressure, Tires ....................... 296
Airbag .............................. 46,54
Airbag Deployment ....................... 56
Airbag Light ................... 47,53,58,74,160
Airbag Maintenance ....................... 57
Airbag, Side .......................... 52,54
Airbag, Window (Side Curtain) ...........49,52,54
Alarm, Panic ............................ 23
Alarm (Security Alarm) .................19,161Alterations/Modifications, Vehicle
............. 9
Antenna, Satellite Radio ................... 215
Antifreeze (Engine Coolant) ................ 413
Anti-Lock Brake System (ABS) ............268,270
Anti-Lock Warning Light .................. 161
Anti-Theft System ....................... 161
Appearance Care ........................ 393
Arming Theft System (Security Alarm) ......... 19
Assist, Hill Start ........................ 278
Auto Down Power Windows ................ 31
Automatic Dimming Mirror ................. 81
Automatic Door Locks ..................... 29
Automatic Headlights .................... 102
Automatic Temperature Control (ATC) ......... 224
Automatic Transmission ................245,389
Adding Fluid ......................... 391
Fluid and Filter Changes ................. 389
Fluid Level Check ................... 390,391
Fluid Type ........................... 389
446 INDEX

Light............................... 143
Luggage Carrier ....................... 150
Cargo Light ............................ 143
Cargo Load Floor ........................ 147
Cargo Tie-Downs ........................ 145
Cargo (Vehicle Loading) ................... 322
Cellular Phone ........................ 84,221
Center High Mounted Stop Light ............ 412
Certification Label ....................... 322
Chains, Tire ............................ 302
Changing A Flat Tire ..................... 348
Chart, Tire Sizing ........................ 286
Check Engine Light
(Malfunction Indicator Light) ............... 366
Checking Your Vehicle For Safety ............. 72
Checks, Safety ........................... 72
Child Restraint ...................... 61,66,68
Child Restraint Tether Anchors .............65,66
Child Safety Locks ........................ 29 Climate Control
......................... 221
Clock ........................ 184,185,189,198
Cold Weather Operation ................... 241
Compact Disc (CD) Maintenance ............. 220
Compact Spare Tire ...................... 298
Compass .............................. 176
Compass Calibration ..................... 177
Compass Variance ....................... 177
Computer, Trip/Travel .................... 173
Connector UCI ................................ 209
Universal Consumer Interface (UCI) ......... 209
Conserving Fuel ........................ 174
Console, Overhead ....................... 127
Contract, Service ........................ 439
Cooling System ......................... 380
Adding Coolant (Antifreeze) .............. 382
Coolant Capacity ...................... 413
Coolant Level ......................... 384
448 INDEX

Starting............................. 240
Temperature Gauge .................... 163
Engine Oil Viscosity ...................... 371
Engine Oil Viscosity Chart ................. 371
Enhanced Accident Response Feature .......... 55
Entry System, Illuminated .................. 20
Exhaust Gas Caution ................72,319,378
Exhaust System ....................... 72,377
Exterior Finish Care ...................... 393
Exterior Lights .......................... 74
Filters Air Cleaner .......................... 372
Engine Oil ........................... 372
Engine Oil Disposal .................... 371
Finish Care ............................ 393
Flashers .............................. 346
Hazard Warning ....................... 346
Turn Signal ................... 74,159,409,410Flipper Glass, Liftgate
..................... 34
Flooded Engine Starting ................... 241
Fluid Capacities ......................... 413
Fluid Leaks ............................. 74
Fluid Level Checks Automatic Transmission ............389,390,391
Brake .............................. 386
Engine Oil ........................... 369
Power Steering ........................ 264
Fluids, Lubricants and Genuine Parts .......... 414
Fog Light Service ........................ 410
Fog Lights ....................... 106,167,410
Folding Rear Seat ........................ 93
Four Wheel Drive ....................... 253
Operation ........................... 253
Systems ............................. 253
Four Wheel Drive Operation ................ 253
Four-Way Hazard Flasher .................. 346
Freeing A Stuck Vehicle ................... 252
10
INDEX 451

Cruise.............................. 166
Daytime Running ...................... 104
Dimmer Switch, Headlight .............101,108
Electronic Stability Program (ESP) Indicator . . . 283
Electronic Throttle Control Warning ......... 167
Exterior .............................. 74
Fog .......................... 106,167,410
Four-Wheel Drive Indicator ............... 165
Fuses ............................... 398
Hazard Warning Flasher ................. 346
Headlight Switch ...................... 102
Headlights ........................ 407,408
Headlights On With Wipers ............... 103
High Beam Indicator .................... 159
Illuminated Entry ....................... 20
Instrument Cluster ..................... 102
Interior ............................. 108
Lights On Reminder .................... 106
Low Fuel ............................ 168 Malfunction Indicator (Check Engine)
........ 159
Map Reading ......................... 108
Oil Pressure .......................... 161
Passing ............................. 108
Reading .......................... 108,127
Rear Servicing ........................ 410
Rear Tail ............................ 410
Seat Belt Reminder ..................... 166
Security Alarm (Theft Alarm) .............. 161
Service ............................. 407
Service Engine Soon (Malfunction Indicator) . . . 159
Side Marker .......................... 410
SmartBeams .......................... 103
Tire Pressure Monitoring (TPMS) ........... 162
Tow/Haul Indicator .................... 165
Traction Control ....................... 283
Turn Signal ................ 74,101,107,409,410
Vanity Mirror .......................... 84
Voltage ............................. 167
10
INDEX 455

Load Floor, Cargo....................... 147
Loading Vehicle ......................... 322
Tires ............................... 291
Locks ................................. 28
Automatic Door ........................ 29
Child Protection ........................ 29
Door ................................ 28
Power Door ........................... 28
Lower Anchors and Tether for CHildren
(LATCH) ............................ 65,66
Lubrication, Body ....................... 375
Luggage Rack (Roof Rack) ................. 150
Lumbar Support ......................... 86
Maintenance Free Battery .................. 373
Maintenance Procedures ................... 368
Maintenance Schedule .................... 418
Malfunction Indicator Light (Check Engine) . . 159,366
Manual, Service ......................... 441 Memory Feature (Memory Seat)
.............. 95
Memory Seat ........................... 95
Memory Seats and Radio ................... 95
Mini-Trip Computer ...................... 173
Mirrors ................................ 80
Automatic Dimming ..................... 81
Electric Powered ....................... 82
Electric Remote ........................ 82
Exterior Folding ........................ 82
Heated .............................. 83
Outside .............................. 81
Rearview ............................. 80
Vanity ............................... 84
Mode Fuel Saver ........................... 174
Modifications/Alterations, Vehicle ............. 9
Monitor, Tire Pressure System ............... 304
Mopar Parts ......................... 368,440
Multi-Displacement Engine System ........... 265
456 INDEX