Page 290 of 426

then be determined separately to be sure that the load is
properly distributed over front and rear axle. Weighing
the vehicle may show that the GAWR of either the front
or rear axles has been exceeded but the total load is
within the specified GVWR. If so, weight must be shifted
from front to rear or rear to front as appropriate until the
specified weight limitations are met.
Store heavier items down low and be sure that the weight
is distributed equally. Stow all loose items securely before
driving.
Improper weight distribution can have an adverse effect
on the way your vehicle steers and handles and the way
the brakes operate.WARNING!
Do not load your vehicle any heavier than the GVWR
or the maximum front and rear GAWR. If you do,
parts on your vehicle can break, or it can change the
way your vehicle handles. This could cause you to
lose control. Also, overloading can shorten the life of
your vehicle.
A loaded vehicle is shown in the following example. Note
that neither GVWR nor GAWR capabilities are exceeded.
Overloading can cause potential safety hazards and
shorten service life.
NOTE: The weights shown in this chart are not the
weights for your vehicle. Also, the amount of load
added to both the front and rear axles can be computed
290 STARTING AND OPERATING
Page 312 of 426
HAZARD WARNING FLASHER
The flasher switch is on the top of the steering column,
just behind the steering wheel. Press the flasher switch
and all front and rear directional signals will flash
intermittently.
Press the switch a second time to turn off the emergency
flashers.This is an emergency warning system and should not be
used when the vehicle is in motion. Use it when your
vehicle is disabled and is creating a safety hazard for
other motorists.
If it is necessary to leave the vehicle to go for service, the
flasher system will continue to operate with the ignition
key removed and the vehicle locked.
ADDING FUEL
If using a portable fuel container, it should have a flexible
nozzle long enough to reach past the restriction in the
fuel filler tube.
312 WHAT TO DO IN EMERGENCIES
Page 315 of 426
WARNING!
The jack is designed as a tool for changing tires only.
The jack should not be used to lift the vehicle for
service purposes, unless suitable supports are placed
under the vehicle as a safety measure. The vehicle
should be jacked on a firm level surface only. Avoid
ice or slippery areas.
Removing The Spare Tire
Remove the spare tire before attempting to jack the truck.
Attach the wheel wrench to the jack extension tube. Insert
the tube through the access hole in the rear bumper and
into the winch mechanism tube. Rotate the wheel wrench
handle counterclockwise until the spare tire is on the
ground with enough cable slack to allow you to pull itJack Stowage Location Crew Cab
WHAT TO DO IN EMERGENCIES 315
6
Page 318 of 426

Tire Changing Procedure
WARNING!
Getting under a jacked-up vehicle is dangerous. The
vehicle could slip off the jack and fall on you. You
could be crushed. Never get any part of your body
under a vehicle that is on a jack. Never start or run
the engine while the vehicle is on a jack. If you need
to get under a raised vehicle, take it to a service center
where it can be raised on a lift.
Do not raise this vehicle using a bumper jack. The scissor
jack is designed as a tool for changing tires on this vehicle
only. It is not recommended that the jack be used for
service purposes or to lift more than one wheel at a time.
Preparations
Park the vehicle on a firm level surface, avoiding ice or
slippery areas. Set the parking brake and place the gear
selector in PARK (automatic transmission). On Four
Wheel Drive vehicles, shift the transfer case to the ª4Lº
position.
WARNING!
Do not attempt to change a tire on the side of the
vehicle close to moving traffic. Pull far enough off
the road to avoid the danger of being hit when
operating the jack or changing the wheel.
²Turn on the Hazard Warning Flasher.
318 WHAT TO DO IN EMERGENCIES
Page 321 of 426

WARNING!
Raising the vehicle higher than necessary can make
the vehicle unstable and cause an accident. It could
slip off the jack and hurt someone near it. Raise the
vehicle only enough to remove the tire.
5. Remove the wheel nuts and pull the wheel off. Install
the spare wheel and wheel nuts with the cone shaped end
of the nuts toward the wheel. Lightly tighten the nuts. To
avoid risk of forcing the vehicle off the jack, do not fully
tighten the nuts until the vehicle has been lowered.
6. Using the wheel wrench, finish tightening the nuts in
a crisscross pattern. Correct nut tightness is 130-160 ft.
lbs. (177-217 N´m). If in doubt about the correct tightness,
have them checked with a torque wrench by your dealer
or at a service station.
WARNING!
A loose tire or jack thrown forward in a collision or
hard stop could injure someone in the vehicle. Al-
ways stow the jack, tools and the extra tire and wheel
in the places provided.
7. Lower the jack to its fully closed position. Stow the
replaced tire, jack, and tools as previously described.
8. Adjust the tire pressure when possible.
NOTE:Do not oil wheel studs. For chrome wheels, do
not substitute with chrome plated wheel nuts.
WHAT TO DO IN EMERGENCIES 321
6
Page 329 of 426
MAINTAINING YOUR VEHICLE
CONTENTS
m3.7L Engine Compartment................332
m4.7L Engine Compartment................333
mOnboard Diagnostic System Ð OBD II........334
NLoose Fuel Filler Cap Message............335
mEmissions Inspection And Maintenance
Programs............................335
mReplacement Parts......................337
mDealer Service.........................337
mMaintenance Procedures..................337NEngine Oil..........................338
NEngine Oil Filter......................341
NDrive Belts Ð Check Condition And Tension . . 342
NSpark Plugs.........................342
NEngine Air Cleaner Filter................343
NEngine Fuel Filter.....................343
NCatalytic Converter....................343
NMaintenance Free Battery................345
NAir Conditioner Maintenance.............346
7
Page 334 of 426

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.
334 MAINTAINING YOUR VEHICLE
Page 335 of 426

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 loose fuel filler cap message
will be displayed in the instrument cluster. Tighten the
gas cap until a9clicking9sound is heard. This is an
indication that the 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 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.
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 is determined not ready
for the I/M test, your vehicle may fail the test.
MAINTAINING YOUR VEHICLE 335
7