2006 JEEP GRAND CHEROKEE four wheel drive

Traction Downhill
Shift the transmission into a low gear and the transfer
case to 4WD LOW range. Let the vehicle go slowly down
the hill with all four wheels turning against engine
compression drag. This will permit you to control the
vehicle speed and direction.
When descending mountains or hills, repeated braking
can cause brake fade with loss of braking control. Avoid
repeated heavy braking by downshifting the transmis-
sion whenever possible.
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.
•Completely inspect the underbody of your vehicle.
Check tires, body structure, steering, suspension, and
exhaust system for damage.
•Check 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.
•Check 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.
•After 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.
STARTING AND OPERATING 277
5

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.
•If 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.
MULTI DISPLACEMENT SYSTEM (MDS) - 5.7L
Engine Only
This feature offers improved fuel economy by shutting
off four of the engine’s eight cylinders during light load
and cruise conditions. The system is automatic with no
driver inputs or additional driving skills required.
NOTE:The MDS system may take some time to return
to full functionality after a battery disconnect.
278 STARTING AND OPERATING

Tire Pressures for High Speed Operation
The manufacturer advocates driving at safe speeds
within posted speed limits. Where speed limits or condi-
tions are such that the vehicle can be driven at high
speeds, maintaining correct tire inflation pressure is very
important. Increased tire pressure and reduced vehicle
loading may be required for high speed vehicle opera-
tion. Refer to original equipment or an authorized tire
dealer for recommended safe operating speeds, loading
and cold tire inflation pressures.
WARNING!
High speed driving with your vehicle under maxi-
mum load is dangerous. The added strain on your
tires could cause them to fail. You could have a
serious accident. Don’t drive a vehicle loaded to the
maximum capacity at continuous speeds above 75
mph (120 km/h).
Radial-Ply Tires
WARNING!
Combining radial ply tires with other types of tires
on your vehicle will cause your vehicle to handle
poorly. The instability could cause an accident. Al-
ways use radial tires in sets of four. Never combine
them with other types of tires.
Cuts and punctures in radial tires are repairable only in
the tread area because of sidewall flexing. Consult your
dealer for radial tire repairs.
Tire Spinning
When stuck in mud, sand, snow, or ice conditions, do not
spin your vehicle’s wheels above 35 mph (55 km/h).
290 STARTING AND OPERATING

CAUTION!
After inspecting or adjusting the tire pressure al-
ways reinstall the valve stem cap. This will prevent
moisture and dirt from entering the valve stem,
which could damage the wheel rim sensor.
NOTE:
•The TPMS can inform the driver of a low tire pressure
condition.
•The TPMS is not intended to replace normal tire care
and maintenance, nor to provide warning of a tire
failure or condition.
•The TPMS should not be used as a tire pressure gauge
while adjusting your tire pressure.
Premium System
The Tire Pressure Monitor System (TPMS) uses wireless
technology with wheel rim mounted electronic sensors to
monitor tire pressure levels. Sensors mounted to each
wheel as part of the valve stem transmit tire pressure
readings to the Receiver Module. The wheel sensors
monitor tire pressure, and status for all four active road
tires and the spare tire. The spare tire pressure is moni-
tored, but not displayed.
NOTE:It is particularly important, for you to check the
tire pressure in all of your tires regularly and to maintain
the proper pressure.
The“Tire Pressure Monitoring Telltale Light”will
illuminate in the instrument cluster, and an au-
dible chime will be activated when one or more
tire pressures is low. The“Tire Pressure Monitoring
Telltale Light”will flash on and off for 10 to 60 seconds
296 STARTING AND OPERATING

WARNING!
Improper towing can lead to an injury accident.
Follow these guidelines to make your trailer towing
as safe as possible:
Make certain that the load is secured in the trailer
and will not shift during travel. When trailering
cargo that is not fully secured, dynamic load shifts
can occur that may be difficult for the driver to
control. You could lose control of your vehicle and
have an accident.
•When hauling cargo or towing a trailer, do not over-
load your vehicle or trailer. Overloading can cause a
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
frame or 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 for Park. With a manual transmission, shift the
transmission into reverse. And with four-wheel-drive
vehicles, make sure the transfer case is not in neutral.
Always, block orchockthe 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
STARTING AND OPERATING 315
5

WARNING!
Stand clear of vehicles when pulling with tow
hooks. Tow straps and chains may break, causing
serious injury.
TOWING A DISABLED VEHICLE
2WD Models Only
Provided the transmission is operable, tow only in N
(Neutral) at speeds not exceeding 30 mph (48 km/h), for
distances of not more than 15 miles (24 km). Towing at
more than 30 mph (48 km/h) or for more than 15 miles
(24 km) can cause severe transmission damage. If the
transmission is not operable, or the vehicle must be
towed faster than 30 mph (48 km/h) or farther than 15
miles (24 km), remove the driveshaft or tow with all four
wheelsOFFthe ground. Acceptable methods are to towthe vehicle on a flatbed or with one end of the vehicle
raised and the other end on a towing dolly.
4WD Models Only
The manufacturer recommends towing with all four
wheelsOFFthe ground. Acceptable methods are to tow
the vehicle on a flatbed or with one end of the vehicle
raised and the other end on a towing dolly.
WHAT TO DO IN EMERGENCIES 339
6

Fluid Capacities......................... 392
Fluid Leaks............................. 71
Fluid Level Checks
Automatic Transmission...............371,372
Engine Oil........................... 351
Power Steering........................ 360
Fluids, Lubricants and Genuine Parts.......... 393
Fog Light Service........................ 389
Fog Lights.......................125,186,389
Folding Rear Seat........................ 111
Four Wheel Drive....................... 262
Operation........................... 262
Systems............................. 262
Four Wheel Drive Operation................ 262
Four-Way Hazard Flasher.................. 328
Freeing A Stuck Vehicle................... 261
Front Axle (Differential)................... 375
Fuel................................. 302
Filler Cap (Gas Cap).................... 306Filler Door (Gas Cap)................... 306
Gasoline............................ 302
Gauge.............................. 186
Materials Added....................... 304
Octane Rating........................ 302
Requirements......................... 392
Tank Capacity........................ 392
Fuel System Caution...................304,307
Fuses................................ 380
Garage Door Opener (HomeLink) ........... 152
Gas Cap (Fuel Filler Cap)...............306,347
Gasoline (Fuel)......................... 302
Gasoline, Reformulated................... 303
Gasoline/Oxygenate Blends................ 303
Gauges
Coolant Temperature.................... 184
Fuel................................ 186
Speedometer......................... 180
INDEX 429
10

Cargo .............................. 165
Center Mounted Stop................... 391
Cruise.............................. 185
Daytime Running...................... 125
Dimmer Switch, Headlight.............121,126
Electronic Stability Program (ESP)
Indicator.......................140,182,185
Electronic Throttle Control Warning......... 186
Fog ..........................125,186,389
Four-Wheel Drive Indicator............... 185
Fuses............................... 380
Hazard Warning Flasher................. 328
Headlight Switch...................... 122
Headlights........................... 387
Headlights On With Wipers............... 123
High Beam Indicator.................... 180
Illuminated Entry....................... 16
Instrument Cluster..................122,124
Interior..........................120,124Lights On Reminder.................... 125
Low Fuel............................ 187
LowTire ............................ 183
Malfunction Indicator (Check Engine)........ 180
Map Reading......................... 120
Oil Pressure.......................... 182
Passing............................. 126
Reading..........................120,152
Rear Servicing........................ 390
Rear Tail............................ 390
Seat Belt Reminder..................... 185
Security Alarm (Theft Alarm).............. 182
Service.............................. 387
Service Engine Soon (Malfunction Indicator) . . . 180
Side Marker.......................... 390
SmartBeams.......................... 123
Tire Pressure Monitoring (TPMS)........... 183
Tow/Haul Indicator.................... 184
Traction Control....................140,182
432 INDEX