engine JEEP GRAND CHEROKEE 2007 WK / 3.G Manual PDF

WARNING!
•Never add fuel when the engine is running.
•Never have any smoking materials lit in or near
the vehicle when the fuel cap is removed or the
tank filled.
VEHICLE LOADING
Certification Label
As required by National Highway Traffic Safety Admin-
istration Regulations, your vehicle has a certification
label affixed to the driver’s side door or pillar.
This label contains the month and year of manufacture,
Gross Vehicle Weight Rating (GVWR), Gross Axle Weight
Rating (GAWR) front and rear, and Vehicle Identification
Number (VIN). A Month-Day-Hour (MDH) number is
included on this label and indicates the Month, Day andHour of manufacture. The bar code that appears on the
bottom of the label is your Vehicle Identification Number
(VIN).
Gross Vehicle Weight Rating (GVWR)
The GVWR is the total permissible weight of your vehicle
including driver, passengers, vehicle, options, trailer
tongue weight, and cargo. The label also specifies maxi-
mum capacities of front and rear axle systems (GAWR).
Total load must be limited so GVWR and front and rear
GAWR are not exceeded.
Payload
The payload of a vehicle is defined as the allowable load
weight a truck can carry, including the weight of the
driver, all passengers, options and cargo.
Gross Axle Weight Rating (GAWR)
The GAWR is the maximum permissible load on the front
and rear axles. The load must be distributed in the cargo
area so that the GAWR of each axle is not exceeded.
316 STARTING AND OPERATING

Trailer Towing Weights (Maximum Trailer Weight Ratings)
The following chart provides the maximum trailer weight ratings towable for your given drivetrain.
Engine/
TransmissionModel GCWR (Gross Com-
bined Wt. Rating)Frontal Area Max. GTW (Gross
Trailer Wt.)Max. Tongue
Wt. (See Note 1)
3.7L/Automatic 4x2 8,000 lbs (3 629 kg) 35 Sq. Ft. (3.25
square meters)3,500 lbs (1 587 kg) 350 lbs (159 kg)
3.7L/Automatic 4x4 8,200 lbs (3 719 kg) 35 Sq. Ft. (3.25
square meters)3,500 lbs (1 587 kg) 350 lbs (159 kg)
4.7L/Automatic 4x2 8.560 lbs (3 883 kg) 35 Sq. Ft. (3.25
square meters)3,500 lbs (1 587 kg) 350 lbs (159 kg)
4.7L/Automatic 4x4 8,650 lbs (3 924 kg) 35 Sq. Ft. (3.25
square meters)3,500 lbs (1 587 kg) 350 lbs (159 kg)
4.7L/Automatic
(w/Trailer Tow
Group IV)4x2 11,200 lbs (5 080 kg) 64 Sq. Ft. (5.95
square meters)6,500 lbs (2 948 kg) 650 lbs (295 kg)
4.7L/Automatic
(w/Trailer Tow
Group IV)4x4 11,450 lbs (5 194 kg) 64 Sq. Ft. (5.95
square meters)6,500 lbs (2 948 kg) 650 lbs (295 kg)
STARTING AND OPERATING 323
5

loss of control, poor performance or damage to brakes,
axle, engine, transmission, steering, suspension, chas-
sis structure or tires.
•Safety chains must always be used between your
vehicle and trailer. Always connect the chains to the
hook retainers of the vehicle hitch. Cross the chains
under the trailer tongue and allow enough slack for
turning corners.
•Vehicles with trailers should not be parked on a grade.
When parking, apply the parking brake on the tow
vehicle. Put the tow vehicle automatic transmission in
P (Park). For four-wheel-drive vehicles, make sure the
transfer case is not in neutral. Always, block orchock
the trailer wheels.
•GCWR must not be exceeded.
•Total weight must be distributed between the tow
vehicle and the trailer such that the following four
ratings are not exceeded:
1. GVWR
2. GTW
3. GAWR
4. Tongue weight rating for the trailer hitch utilized
(This requirement may limit the ability to always
achieve the 10% to 15% range of tongue weight as a
percentage of total trailer weight).
STARTING AND OPERATING 327
5

Towing Tips — Automatic Transmission
The “D” range can be selected when towing. However, 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 a
lower gear range while operating the vehicle under
heavy operating conditions will improve performance
and extend transmission life by reducing excessive shift-
ing and heat build up. This action will also provide better
engine braking.
The automatic transmission fluid and filter should be
changed if you REGULARLY tow a trailer for more than
45 minutes of continuous operation. Refer to “Mainte-
nance Schedule B” in Section 8 of this manual for
transmission fluid change intervals.
NOTE:Check the automatic transmission fluid level
before towing.
Towing Tips — Electronic Speed Control (If
Equipped)

Don’t 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.
Towing Tips — Cooling System
To reduce potential for engine and transmission over-
heating, take the following actions:
City Driving
When stopped for short periods of time, put transmission
in neutral and increase engine idle speed.
Highway Driving
Reduce speed.
STARTING AND OPERATING 331
5

Shifting Into Neutral (N)
Use the following procedure to prepare your vehicle for
recreational towing.
CAUTION!
It is necessary to follow these steps to be certain that
the transfer case is fully in N (Neutral) before
recreational towing to prevent damage to internal
parts.
1. Depress brake pedal.
2. Turn the ignition key ON, engine off.
3. Shift transmission into N (Neutral).
4. Shift transfer case into N (Neutral).
Hold down N (Neutral) “pin” switch (with a pen, etc.) for
4 seconds until the LED lamp by the switch starts to blinkindicating shift in progress. Lamp will stop blinking (stay
on solid) when Neutral shift is complete. A “4WD SYSTEM
IN NEUTRAL” message will display on the EVIC (Elec-
tronic Vehicle Information Center). Refer to “Electronic
Vehicle Information Center (EVIC)” in Section 4 of this
manual. (See page 183 for more information.)Neutral Switch
STARTING AND OPERATING 333
5

5. Start engine.
6. Shift transmission into D (Drive).
7. Release brake pedal and ensure that there is no vehicle
movement.
8. Shut the engine off.
9. Shift transmission into P (Park).
10. Place the ignition key in the OFF position, and
remove key.
11. Apply parking brake.
12. Attach vehicle to the tow vehicle with tow bar.
13. Release parking brake.CAUTION!
Transmission damage may occur if the transmission
is shifted into P (Park) with the transfer case in N
(Neutral) and the engine running. With the transfer
case in N (Neutral) ensure that the engine is OFF
prior to shifting the transmission into P (Park) (refer
to steps7–8above).
Shifting Out Of Neutral (N)
Use the following procedure to prepare your vehicle for
normal usage.
1. Depress brake pedal.
2. Turn the ignition key ON, engine off.
3. Shift transmission into N (Neutral).
4. Shift transfer case out of N (Neutral).
334 STARTING AND OPERATING

Hold down N (Neutral) “pin” switch (with a pen, etc.) for
4 seconds until the LED lamp by the switch starts to blink
indicating shift in progress. Lamp will stop blinking (go
out) when shift is complete. The “4WD SYSTEM IN
NEUTRAL” message will no longer be displayed on the
EVIC (Electronic Vehicle Information Center). Refer to
“Electronic Vehicle Information Center (EVIC)” in Sec-
tion 4 of this manual. (See page 183 for more informa-
tion.)
5. Shift transmission into P (Park).
6. Start the engine.
7. Shift transmission into D (Drive).
Neutral Switch
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5

NOTE:When shifting out of transfer case N (Neutral),
turning the engine OFF may be required to avoid gear
clash.
WARNING!
You or others could be injured if you leave the
vehicle unattended with the transfer case in the N
(Neutral) position without first fully engaging the
parking brake. The transfer case N (Neutral) position
disengages both the front and rear driveshafts from
the powertrain and will allow the vehicle to move
regardless of the transmission position. The parking
brake should always be applied when the driver is
not in the vehicle.
CAUTION!
Do not use a bumper mounted clamp-on tow bar on
your vehicle. The bumper face bar will be damaged.
SNOW PLOW
Snow plows, winches, and other aftermarket equipment
shouldnotbe added to the front end of your vehicle. The
airbag crash sensors may be affected by the change in the
front end structure. The airbags could deploy unexpect-
edly or could fail to deploy during a collision.
WARNING!
Do not add a snow plow, winches, or any other after-
market equipment to the front of your vehicle. This
could adversely affect the functioning of the airbag
system and you could be injured.
336 STARTING AND OPERATING

WHAT TO DO IN EMERGENCIES
CONTENTS

Hazard Warning Flashers.................338

If Your Engine Overheats.................338

Jacking And Tire Changing................339
▫Jack Location........................340
▫Spare Tire Stowage....................340
▫Spare Tire Removal....................341
▫Preparations For Jacking................342▫Jacking Instructions....................342

Jump Starting.........................346

Emergency Tow Hooks — If Equipped........349

Towing A Disabled Vehicle................350
▫2WD Models Only....................350
▫4WD Models Only....................350
6

HAZARD WARNING FLASHERS
Your vehicle’s hazard warning flasher is an emergency
warning system. When you activate it, all front and rear
directional signals will flash intermittently. Use it when your
vehicle is disabled on or near the road. It warns other drivers
to steer clear of you and your vehicle. This is an emergency
warning system, not to be used when the vehicle is in motion.
To activate the warning flasher, push down on the button
on top of the steering column until it latches. To turn the
warning flasher off, push down again to unlatch the
button.
NOTE:With extended use, the flasher may run down
your battery.
IF YOUR ENGINE OVERHEATS
In any of the following situations, you can reduce the
potential for overheating by taking the appropriate ac-
tion.
•On the highways — Slow down.
•In city traffic — While stopped, put transmission in N
(Neutral), but do not increase engine idle speed.
NOTE:There are steps that you can take to slow down
an impending overheat condition. If your air conditioner
is on, turn it off. The air conditioning system adds heat to
the engine cooling system and turning off the A/C
Hazard Warning Switch
338 WHAT TO DO IN EMERGENCIES