2004 JEEP GRAND CHEROKEE wheel torque

STARTING AND OPERATING
CONTENTS
mStarting Procedures.....................176
NNormal Starting......................176
NExtreme Cold Weather (Below ±20ÉF (±29ÉC) . . 177
NIf Engine Fails To Start.................177
NAfter Starting........................178
mEngine Block Heater Ð If Equipped.........178
mAutomatic Transmission..................179
NBrake Transmission Shift Interlock System
(BTSI).............................180NElectronically Controlled Five Speed Automatic
Transmission (4.7L Engine Only)..........180
NProtect Mode - Electronically Controlled
Transmission (4.7L Engine Only)..........180
NGear Ranges.........................181
NOver Temperature Mode................185
NTorque Converter Clutch................185
NRocking The Vehicle...................186
mFour-Wheel Drive Operation...............186
5

5 km/h). Avoid attempting to engage or disengage 4LO
with the vehicle moving faster than 2 to 3 mph (3 to 5
km/h).
Quadra-Trac IITOperating
Instructions/Precautions Ð If Equipped
The Quadra-Trac IIttransfer case is fully automatic in the
normal driving 4 ALL TIME mode. The Quadra-Trac IIt
transfer case provides three mode positions Ð four wheel
drive high range, neutral, and four wheel drive low
range.
This transfer case is fully automatic in the 4 ALL TIME
mode. The 4 ALL TIME mode transmits torque to the rear
axle during normal driving, similar to a rear wheel drive
vehicle. When speed difference is increased between the
front and rear driveshafts the majority of engine torque
can be transmitted to the front driveshaft.
When additional traction is required, the 4LO position
can be used to lock the front and rear driveshafts togetherand force the front and rear wheels to rotate at the same
speed. The 4LO position is intended for loose, slippery
road surfaces only. Driving in the 4LO position on dry
hard surfaced roads may cause increased tire wear and
damage to driveline components.
When operating your vehicle in 4LO, the engine speed is
approximately three times that of the 4 ALL TIME
position at a given road speed. Take care not to overspeed
the engine and do not exceed 25 mph (40 km/h).
Proper operation of four wheel drive vehicles depends on
tires of equal size, type, and circumference on each
wheel. Any difference will adversely affect shifting and
cause damage to the transfer case.
Because four wheel drive provides improved traction,
there is a tendency to exceed safe turning and stopping
speeds. Do not go faster than road conditions permit.
STARTING AND OPERATING 191
5

Quadra-DriveTSystem Ð If Equipped
The optional Quadra-DrivetSystem features three
torque transfer couplings. The couplings include Vari-
Lok front and rear axles and Quadra-Trac IIttransfer
case. The optional Vari-Lok axles are fully automatic and
require no driver input to operate. Under normal driving
conditions the units function as standard axles balancing
torque evenly between left and right wheels. With a
traction difference between left and right wheels the
coupling will sense a speed difference. As one wheel
begins to spin faster than the other, torque will automati-
cally transfer from the wheel that has less traction to the
wheel that has traction. While the transfer case and axle
couplings differ in design, their operation is similar.
Follow the Quadra-Trac IIttransfer case shifting infor-
mation, preceding this section, for shifting this system.
VARI-LOK FRONT AND REAR AXLES Ð IF
EQUIPPED
The optional Vari-Lok axle is fully automatic and requires
no driver input to operate. Under normal driving condi-
tions the unit functions as a standard axle balancing
torque evenly between left and right wheels. With a
traction difference between left and right wheels the
coupling will sense a speed difference. As one wheel
begins to spin faster than the other, torque will automati-
cally transfer from the wheel that has less traction to the
wheel that has traction.
PARKING BRAKE
To set the parking brake, pull the lever up as firmly as
possible. When the parking brake is applied with the
ignition ON, the ªBrake Warning Lightº in the instru-
ment cluster will light.
194 STARTING AND OPERATING

After Driving Off-Road
Off-road operation puts more stress on your vehicle than
does most on-road driving. After going off-road it is
always a good idea to check for damage. That way you
can get any problems taken care of right away and have
your vehicle ready when you need it.
²Completely inspect the underbody of your vehicle.
Check tires, body structure, steering, suspension, and
exhaust system for damage.
²Check threaded fasteners for looseness, particularly on
the chassis, drivetrain components, steering, and sus-
pension. Retighten them, if required, and torque to the
values specified in the Service Manual.
²Check for accumulations of plants or brush. These
things could be a fire hazard. They might hide damage
to fuel lines, brake hoses, axle pinion seals, and
propeller shafts.
²After extended operation in mud, sand, water, or
similar dirty conditions, have brake rotors, wheels,
brake linings, and axle yokes inspected and cleaned as
soon as possible.
WARNING!
Abrasive material in any part of the brakes may
cause excessive wear or unpredictable braking. You
might not have full braking power when you need it
to prevent an accident. If you have been operating
your vehicle in dirty conditions, get your brakes
checked and cleaned as necessary.
²If you experience unusual vibration after driving in
mud, slush or similar conditions, check the wheels for
impacted material. Impacted material can cause a
wheel imbalance and freeing the wheels of it will
correct the situation.
202 STARTING AND OPERATING

9. Tighten the lug nuts securely in a crisscross pattern.
Have an authorized service technician check that the
torque is 85-115 ft.lbs. (115-156 N´m) as soon as possible.
10. Secure the jack, lug wrench, jack handle and tire in
the proper locations.WARNING!
²A loose tire or jack thrown forward in a collision
or hard stop could injure someone in the vehicle.
Always stow the jack parts and the extra tire and
wheel in the places provided.
²Carefully follow these tire changing warnings to
help prevent personal injury or damage to your
vehicle:
²Always park on a firm, level surface as far from the
edge of the roadway as possible before raising the
vehicle.
²Block the wheel diagonally opposite the wheel to be
raised.
²Apply the parking brake firmly before jacking.
²Never start the engine with the vehicle on a jack.
WHAT TO DO IN EMERGENCIES 245
6

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

Vehicle Storage......................... 289
Vinyl Trim............................. 284
Voltmeter............................. 129
Warning Flasher, Hazard.................. 236
Warning Lights (Instrument Cluster Description) . 129
Warnings and Cautions..................... 7
Warranty Information..................... 321
Washer, Adding Fluid..................... 171
Washers, Windshield...................80,268
Washing Vehicle......................... 282
Waxing and Polishing..................... 282
Wheel Alignment and Balance............... 217
Wheel Changing........................ 242Wheel Mounting........................ 244
Wheel Nut Torque....................... 245
Wind Buffeting.......................... 25
Window Fogging........................ 170
Windows
Power............................... 24
Windshield Defroster................53,167,168
Windshield Washers...................... 80
Fluid............................... 268
Windshield Wiper Blades.................. 268
Windshield Wipers....................... 80
Wipers, Intermittent....................... 81
Wipers, Rain Sensitive..................... 82
344 INDEX