2007 JEEP GRAND CHEROKEE service indicator

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.” 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 dealer for service as soon as
possible.CAUTION!
•Prolonged driving with the “Malfunction Indica-
tor Light” on could cause further damage to the
emission control system. It could also affect fuel
economy and driveability. The vehicle must be
serviced before any emissions tests can be per-
formed.
•If the “Malfunction Indicator Light” is flashing
while the engine is running, severe catalytic con-
verter 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 Section 4 of this
358 MAINTAINING YOUR VEHICLE

manual). Tighten the gas cap until aclickingsound is
heard. This is an indication that the gas cap is properly
tightened.
This message may be temporarily overridden by pressing
either the C/T, STEP, or MENU buttons. However, after
one minute of no customer interaction, the EVIC will
display again the “CHECK GASCAP” message. The
message will remain displayed until the vehicle diagnos-
tic 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 damagedcap. If the problem is detected twice in a row, the system
will turn on the Malfunction Indicator Light (MIL).
Resolving the problem will turn the MIL light 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 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 battery
MAINTAINING YOUR VEHICLE 359
7

To determine the battery charge, check the battery test
indicator (if equipped) on top of the battery. Refer to the
illustration.
CAUTION!
•It is essential when replacing the cables on the
battery that the positive cable is attached to the
positive post and the negative cable is attached to
the negative post. Battery posts are marked (+)
positive and negative (-) and identified on the
battery case.
•If a “fast charger” is used while battery is in the
vehicle, disconnect both vehicle battery cables
before connecting the charger to battery. Do not
use a “fast charger” to provide starting voltage.
Air Conditioner Maintenance
For best possible performance, your air conditioner should
be checked and serviced by an Authorized Dealer at the
start of each warm season. This service should include
MAINTAINING YOUR VEHICLE 371
7

Headlight Switch...................... 114
Headlights........................... 402
Headlights On With Wipers............... 114
High Beam Indicator.................... 175
Illuminated Entry....................... 19
Instrument Cluster................... 114,116
Interior........................... 116,118
Lights On Reminder.................... 117
Low Fuel............................ 182
LowTire ............................ 178
Malfunction Indicator (Check Engine)........ 175
Map Reading......................... 119
Oil Pressure.......................... 177
Passing............................. 118
Reading.......................... 119,145
Rear Servicing........................ 404
Rear Tail............................ 404
Seat Belt Reminder..................... 181
Security Alarm (Theft Alarm).............. 177Service.............................. 402
Service Engine Soon (Malfunction Indicator) . . . 175
Side Marker.......................... 404
SmartBeams.......................... 115
Tire Pressure Monitoring (TPMS)........... 178
Tow/Haul Indicator.................... 180
Traction Control....................137,177
Turn Signal.................. 113,117,403,404
VanityMirror .......................... 76
Voltage............................. 182
Load Floor, Cargo....................... 163
Loading Vehicle......................... 316
Tires ............................... 283
Locks................................. 26
Automatic Door........................ 27
Child Protection........................ 28
Door................................ 26
Power Door........................... 26
INDEX 461
10

Lower Anchors and Tether for CHildren
(LATCH)............................ 58,60
Lubrication, Body....................... 374
Luggage Rack (Roof Rack)................. 166
Lumbar Support........................ 101
Maintenance Free Battery.................. 370
Maintenance Procedures................... 362
Maintenance Schedule.................412,433
Diesel.............................. 433
Light Duty Schedule “A”................ 441
Light Duty Schedule “B”................. 436
Schedule “A”......................427,441
Schedule “B”......................415,436
Maintenance Schedules.................... 412
Malfunction Indicator Light (Check Engine) . . 175,359
Manual, Service......................... 448
Memory Feature (Memory Seat)............. 106
Memory Seat........................... 106Memory Seats and Radio.................. 106
Mini-Trip Computer...................... 193
Mirrors ................................ 72
Automatic Dimming..................... 72
Electric Powered....................... 75
Electric Remote........................ 75
Exterior Folding........................ 74
Heated.............................. 76
Outside.............................. 73
Rearview............................. 72
Vanity ............................... 76
Modifications/Alterations, Vehicle............. 9
Monitor, Tire Pressure System............... 295
Mopar Parts.........................361,447
Multi-Displacement Engine System........... 278
Multi-Function Control Lever............... 113
Navigation Radio........................ 220
Navigation System....................... 220
462 INDEX

Inspection............................ 65
Maintenance........................ 65,393
Pretensioners.......................... 41
Reminder............................ 181
Shoulder Belt Anchorage.................. 40
Seats................................. 99
Adjustment........................... 99
Cleaning............................ 391
Easy Entry........................... 110
Head Restraints....................... 102
Heated............................. 102
Lumbar Support....................... 101
Memory............................. 106
Power...........................101,102
Rear Folding......................... 104
Reclining ............................ 100
Security Alarm (Theft Alarm)............. 18,177
Selection of Oil......................363,364
Sentry Key (Immobilizer)................... 15Sentry Key Programming................... 17
Sentry Key Replacement................... 17
Service Assistance....................... 444
Service Contract......................... 446
Service Engine Soon Light
(Malfunction Indicator).................... 175
Service Manuals........................ 448
Setting the Clock..................201,215,221
Shifting ............................... 253
Automatic Transmission................. 253
Shoulder Belts........................... 35
Signals, Turn................... 117,175,403,404
SmartBeams........................... 115
Snow Chains (Tire Chains)................. 294
Snow Plow............................ 336
Spare Tire............................. 340
Spark Plug Wires (Ignition Cables/Wires)...... 367
Spark Plugs............................ 367
Specifications
Fuel (Gasoline)........................ 305
466 INDEX

Trailer and Tongue Weight................ 325
Wiring .............................. 329
TrailerTowingGuide ..................... 323
TrailerWeight .......................... 323
Transfer Case........................... 385
Maintenance.......................... 385
Transmission
Automatic........................254,386
Maintenance.......................... 386
Range Indicator....................... 181
Shifting ............................. 253
Transmitter Battery Service (Remote Keyless Entry) . 23
Transmitter, Garage Door Opener (HomeLink) . . 146
Transmitter, Remote Keyless Entry (RKE)........ 19
Tread Wear Indicators.................... 291
Turn Signals................... 117,175,403,404
UConnect™ (Hands-Free Phone).............. 77
Underhood Fuses.....................396,399Uniform Tire Quality Grades................ 449
Universal Transmitter..................... 146
Upholstery Care........................ 391
Vacuum/Vapor Harnesses................. 381
VanityMirrors ........................... 76
Variance, Compass....................... 196
Vehicle Identification Number (VIN)............ 8
Vehicle Loading......................284,316
Vehicle Modifications/Alterations.............. 9
Vehicle Storage.......................243,400
Video Entertainment System (Rear Seat Video
System)............................... 225
Viscosity, Engine Oil...................364,365
Warning Flasher, Hazard.................. 338
Warnings and Cautions..................... 8
Warranty Information..................... 447
Washer, Adding Fluid..................... 165
INDEX 469
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