2004 JEEP GRAND CHEROKEE service indicator

CAUTION!
If the ªMalfunction Indicator Lightº is flashing,
immediate service is required. See ªOnboard Diag-
nostic Systemº in Section 7 of this manual.
Materials Added To Fuel
All gasoline sold in the United States is required to
contain effective detergent additives. Use of additional
detergents or other additives is not needed under normal
conditions.
FUEL TANK FILLER CAP (GAS CAP)
WARNING!
To avoid fuel spillage and overfilling, do not ªtop
offº the fuel tank after filling.
The gas cap is located behind the fuel filler door, on the
left side of the vehicle. If the gas cap is lost or damaged,
be sure the replacement cap has been designed for use
with this vehicle. When the gas cap is removed for
refueling, it can be placed in the fuel filler door while
filling the fuel tank.
224 STARTING AND OPERATING

ONBOARD DIAGNOSTIC SYSTEM Ð 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 ªMalfunction Indicator Light.º 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!
²Prolonged driving with the ªMalfunction Indica-
tor Lightº 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.
²If the ªMalfunction Indicator Lightº is flashing
while the engine is running, severe catalytic con-
verter damage and power loss will soon occur.
Immediate service is required.
MAINTAINING YOUR VEHICLE 253
7

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
replacement. If the OBD 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 system is ready, you must do
the following:
1. Insert your ignition key into the ignition switch.
2. Turn the ignition to the ON position, but do not crank
or start the engine.
3. If you crank or start the engine, you will have to start
this test over.
4. As soon as you turn your key to the ON position, you
will see your MIL symbol come on as part of a normal
bulb check.
5. Approximately 15 seconds later, one of two things will
happen:
a. The MIL will flash for about 10 seconds and then
return to being fully illuminated until you turn off the
254 MAINTAINING YOUR VEHICLE

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.
Also, if a ªfast chargerº is used while battery is in the
vehicle, disconnect both vehicle battery cables be-
fore connecting the charger to battery. Do not use a
ªfast chargerº 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 cleaning of the condenser fins and a performance
test. Drive belt tension should also be checked at this
time.
MAINTAINING YOUR VEHICLE 265
7

Lumbar Support......................... 67
Maintenance, Airbag...................... 43
Maintenance Free Battery.................. 264
Maintenance Procedures................... 256
Maintenance Schedule.................... 296
Schedule9A9......................... 310
Schedule9B9.......................... 299
Maintenance Schedules.................... 296
Maintenance, Sunroof..................... 114
Malfunction Indicator Light..............130,254
Manual, Service......................... 324
Map/Reading Lights....................75,89
Master Cylinder......................... 276
Memory Seat........................... 68
Memory Seats and Radio................... 68
Mini-Trip Computer...................... 103
Mirrors................................ 59
Automatic Dimming..................... 60Electric Powered....................... 61
Electric Remote........................ 61
Exterior Folding........................ 61
Heated.............................. 61
Outside.............................. 61
Rearview............................. 59
Vanity............................... 62
Modifications/Alterations, Vehicle............. 8
Monitor, Tire Pressure System.............92,217
Mopar Parts.........................255,323
Multi-Function Control Lever................ 76
Navigation System....................... 152
New Vehicle Break-In Period................ 51
Occupant Restraints....................... 26
Octane Rating, Gasoline................... 221
Odometer............................. 132
Trip ................................ 132
INDEX 337
10

Wheel Nut Torque..................... 245
Tongue Weight/Trailer Weight.............. 228
Torque Converter Clutch.................. 185
Tow Hooks, Emergency................... 248
Towing............................226,248
Disabled Vehicle....................... 248
Recreational.......................... 231
Trailer Towing.......................... 226
Cooling System Tips.................... 229
Minimum Requirements................. 230
Tips ................................ 229
Trailer and Tongue Weight................ 228
Warnings............................ 227
Transfer Case........................... 280
Maintenance.......................... 280
Transmission
Automatic........................179,277
Maintenance.......................... 277
Shifting............................. 181Warning Light........................ 131
Transmitter Battery Service.................. 22
Transmitter, Garage Door Opener............ 106
Transmitter Programming................... 22
Tread Wear Indicators.................... 215
Trip Odometer.......................... 132
Trip Odometer Reset Button................ 132
Turn Signals.........................79,129
Underhood Fuses........................ 288
Universal Transmitter..................... 106
Upholstery Care........................ 284
Vacuum/Vapor Harnesses................. 274
Vanity Mirrors........................... 62
Variance, Compass....................... 105
Vehicle Identification Number................ 7
Vehicle Loading......................... 208
Vehicle Modifications/Alterations.............. 8
INDEX 343
10