2004 JEEP GRAND CHEROKEE inflation pressure

1. If any tire pressure has exceeded the low or high
pressure (refer to STARTING AND OPERATING Ð
TIRES AND WHEELS), the TPM system will display a
message in the EVIC and sound a chime. It will then go
into the tire pressure display screen and flash the pres-
sure value of the tire that is low or high. This will be
displayed for the rest of the ignition cycle, or until either
the C/T, MENU, STEP, or RESET button is pressed.
NOTE:This display will return 60 seconds after either
the C/T, MENU, STEP, or RESET button is pressed. If a
tire is low or high, you should correct your tire inflation
pressure as soon as possible and inspect all of your tires.
Refer to STARTING AND OPERATING Ð TIRES AND
WHEELS for more details.
Once the low or high tire pressure message has occurred,
it will continue to blink until the tire pressure is cor-
rected.2. If the spare tire pressure has exceeded the low or high
pressure allowed, the TPM system will display a message
in the EVIC for 60 seconds and sound a chime per every
ignition cycle (5 Tire TPM System Only).
NOTE:This message will return every ignition cycle,
until the tire pressures are corrected.
3. When the vehicle is moving and the EVIC cannot
receive a valid sensor signal from the tire pressure
sensors, the TIRE PRESSURE UNAVAILABLE message
will be displayed for 5 seconds along with a chime. The
display will then shift to the individual tire pressure
display screen and display dashes for the tire or tires that
are affected. Once the TIRE PRESSURE UNAVAILABLE
message has been displayed, and valid sensor signals are
received, the EVIC will display the TIRE PRESSURE
NOW AVAILABLE message for 5 seconds along with a
chime. This is meant to inform you when the TPM system
has returned to it's normal operation. This will occur
UNDERSTANDING THE FEATURES OF YOUR VEHICLE 93
3

when valid tire pressure sensor messages have been
received from all 4 road tires. TPM system function is
temporarily unavailable due to external electromagnetic
interference, such as electronic devices or nearby radio or
TV towers.
4. In addition to monitoring the vehicle tires, the TPM
system monitors faults within the system. When any
fault has been set, the TPM system will display TIRE
SENSOR BAD/MISSING. Be sure to inspect your tires for
proper inflation pressure. After you determine that your
tires are properly inflated, see your authorized dealer for
service to diagnose the problem with the TPM system.5. With the 5 Tire TPM System, if a road tire is replaced
by the spare, the TPM system will automatically detect
that the tires have been switched (after the ignition has
been cycled) and display SPARE SWAP DETECTED
along with a chime. This could take up to 10 minutes
with vehicle speed above 25 mph (40 km/h).
6. With the 4 Tire TPM System, if a road tire is replaced
by the spare, the TPM system will display TIRE SENSOR
BAD/MISSING. This is due to the spare tire not being
equipped with a tire pressure sensor. Once the road tire is
repaired and/or installed back on the vehicle with the
proper tire pressure the message will be removed. This
could take up to 10 minutes with vehicle speed above 25
mph (40 km/h).
94 UNDERSTANDING THE FEATURES OF YOUR VEHICLE

Tire Pressure Display Ð If Equipped
Shows the current pressure of all 4 road tires.
NOTE:Tires heat up during normal driving conditions.
Heat will cause the tire pressure to increase from 2 to 6
psi (14 to 41 kPa) during normal driving conditions. Refer
to ªTire Inflation Pressuresº in Section 5 for additional
information.
Blank Screen
Shows a blank screen. Pressing the C/T button returns to
the compass/temperature display.
Automatic Compass Calibration
This compass is self-calibrating which eliminates the
need to manually set the compass. When the vehicle is
new, the compass may appear erratic and the CAL
symbol will be displayed.
After completing one 360 degree turn, with the vehicle
traveling less than 5 mph (8 km/h), in an area free from
large metal or metallic objects, the CAL symbol will turn
off and the compass will function normally.
Manual Compass Calibration
If the compass appears erratic and the CAL symbol does
not appear, you must manually put the compass into the
ªCalibrationº mode.
104 UNDERSTANDING THE FEATURES OF YOUR VEHICLE

NSelec-TractOperating
Instructions/Precautions................186
NShift Positions........................188
NShifting Procedure....................189
NQuadra-Trac IItOperating
Instructions/Precautions Ð If Equipped.....191
NShift Positions........................192
NShifting Procedure....................193
NQuadra-DrivetSystem Ð If Equipped......194
mVari-Lok Front And Rear Axles Ð If Equipped . . 194
mParking Brake.........................194
mAnti-Lock Brake System..................197
mOn-Road Driving Tips...................199
mOff-Road Driving Tips...................200NWhen To Use 4 Lo (Low) Range...........200
NIn Snow, Mud And Sand................200
NHill Climbing........................200
NTraction Downhill.....................201
NAfter Driving Off-Road.................202
mTire Safety Information...................203
NTire Markings........................203
NTire Identification Number (TIN)..........206
NTire Loading And Tire Pressure...........207
mTires Ð General Information...............211
NTire Inflation Pressures.................212
NHigh Speed Operation.................213
NRadial-Ply Tires......................214
174 STARTING AND OPERATING

ANTI-LOCK BRAKE SYSTEM
The Anti-Lock Brake System (ABS) is designed to aid the
driver in maintaining vehicle control under adverse
braking conditions. The system operates with a separate
computer to modulate hydraulic pressure to prevent
wheel lock-up and help avoid skidding on slippery
surfaces.
All vehicle wheels and tires must be the same size and
type and tires must be properly inflated to produce
accurate signals for the computer.
WARNING!
Significant over or under inflation of tires, or mixing
sizes of tires or wheels on the vehicle can lead to loss
of braking effectiveness.
The Anti-Lock Brake System conducts a low-speed self-
test at about 12 mph (20 km/h). If you have your foot
lightly on the brake while this test is occurring you may
feel slight pedal movement. The movement can be more
apparent on ice and snow. This is normal.
The Anti-Lock Brake System pump motor runs during
the self-test at 12 mph (20 km/h) and during an ABS stop.
The pump motor makes a low humming noise during
operation, which is normal.
WARNING!
Pumping of the Anti-Lock Brakes will diminish
their effectiveness and may lead to an accident.
Pumping makes the stopping distance longer. Just
press firmly on your brake pedal when you need to
slow down or stop.
STARTING AND OPERATING 197
5

EXAMPLE:
Service Description:
95= Load Index
ÐA numerical code associated with the maximum load a tire can carry.
H= Speed Symbol
ÐA symbol indicating the range of speeds at which a tire can carry a load corresponding
to its load index under certain operating conditions.
ÐThe maximum speed corresponding to the Speed Symbol should only be achieved un-
der specified operating conditions. (ie. tire pressure, vehicle loading, road conditions and
posted speed limits).
Load Identification:
(....blank....(= Absence of any text on sidewall of the tire indicates a Standard Load (SL) Tire
Extra Load (XL)= Extra Load (or Reinforced) Tire
Light Load= Light Load Tire
C,D,E= Load range associated with the maximum load a tire can carry at a specified pressure
Maximum LoadÐ Maximum Load indicates the maximum load this tire is designed to carry.
Maximum PressureÐ
Maximum Pressure indicates the maximum permissible cold tire inflation pressure for this tire.
STARTING AND OPERATING 205
5

Tire Loading and Tire Pressure
Tire Placard Location
NOTE:Some vehicles have a ªTire and Loading Infor-
mationº placard located on the driver's side ªBº pillar.
Tire and Loading Information Placard
This placard tells you important information about the,
1) number of people that can be carried in the vehicle
2) the total weight your vehicle can carry
3) the tire size designed for your vehicle
4) the cold tire inflation pressures for the front, rear
and spare tires.
STARTING AND OPERATING 207
5

Loading
The vehicle maximum load on the tire must not exceed
the load carrying capacity of the tire on your vehicle. You
will not exceed the tire's load carrying capacity if you
adhere to the loading conditions, tire size and cold tire
inflation pressures specified on the Tire and Loading
Information placard and the Vehicle Loading section of
this manual.
NOTE:Under a maximum loaded vehicle condition,
gross axle weight ratings (GAWR's) for the front and rear
axles must not be exceeded. For further information on
GAWR's, vehicle loading and trailer towing, see the
Vehicle Loading section of this manual.To determine the maximum loading conditions of your
vehicle, locate the statement ªThe combined weight of
occupants and cargo should never exceed XXX kg or XXX
lbs.º on the Tire and Loading Information placard. The
combined weight of occupants, cargo/luggage and
trailer tongue weight (if applicable) should never exceed
the weight referenced here.
Steps for Determining Correct Load Limit
1. Locate the statement ªThe combined weight of occu-
pants and cargo should never exceed XXX poundsº on
your vehicle's placard.
2. Determine the combined weight of the driver and
passengers that will be riding in your vehicle.
208 STARTING AND OPERATING