2008 JEEP GRAND CHEROKEE stop start

²The TPMS is not a substitute for proper tire mainte-
nance, and it is the driver 's responsibility to maintain
correct tire pressure using an accurate tire gauge, even
if under-inflation has not reached the level to trigger
illumination of the ªTire Pressure Monitoring Telltale
Light.º
²Seasonal temperature changes will affect tire pressure,
and the TPM system will monitor the actual tire
pressure in the tire.
Base System Ð If Equipped
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.
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 Monitor System (TPMS) consists of the
following components:
²Receiver Module
²4 Tire Pressure Monitoring Sensors
²Tire Pressure Monitoring Telltale Light
A tire pressure monitoring sensor is located in the spare
wheel if the vehicle is equipped with a matching full size
spare wheel and tire assembly. The matching full size
spare tire can be used in place of any of the four road
tires. A low spare tire will not cause the ªTire Pressure
Monitoring Telltale Lightº to illuminate or the chime to
sound.
The ªTire Pressure Monitoring Telltale Lightº will
illuminate in the instrument cluster, and an au-
dible chime will be activated when one or more of
the four active road tire pressures are low. Should this
occur, you should stop as soon as possible, check the
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Should a low tire condition occur on any of the four
active road tire(s), you should stop as soon as possible,
and inflate the low tire(s) that is flashing on the graphic
display to the vehicle's recommended cold tire pressure.
The system will automatically update, the graphic dis-
play of the pressure value(s) will stop flashing, and the
ªTire Pressure Monitoring Telltale Lightº will extinguishonce the updated tire pressure(s) have been received. The
vehicle may need to be driven for up to 10 minutes above
15 mph (24 km/h) to receive this information.
Check TPM System Message
The ªTire Pressure Monitoring Telltale Lightº will flash
on and off for 75 seconds, and remain on solid when a
system fault is detected. The system fault will also sound
a chime. The EVIC will display a ªCHECK TPM SYS-
TEMº message for 3 seconds. This text message is then
followed by a graphic display, with ª- -ª in place of the
pressure value(s) indicating which Tire Pressure Moni-
toring Sensor(s) is not being received.
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Carbon Monoxide Warnings
WARNING!
Carbon monoxide (CO) in exhaust gases is deadly.
Follow the precautions below to prevent carbon
monoxide poisoning:
²Do not inhale exhaust gases. They contain carbon
monoxide, a colorless and odorless gas which can kill.
Never run the engine in a closed area, such as a
garage, and never sit in a parked vehicle with the
engine running for an extended period. If the vehicle is
stopped in an open area with the engine running for
more than a short period, adjust the ventilation system
to force fresh, outside air into the vehicle.
²Guard against carbon monoxide with proper mainte-
nance. Have the exhaust system inspected every timethe vehicle is raised. Have any abnormal conditions
repaired promptly. Until repaired, drive with all side
windows fully open.
²Keep the liftgate closed when driving your vehicle to
prevent carbon monoxide and other poisonous ex-
haust gases from entering the vehicle.
FLEXIBLE FUEL (4.7L ENGINE ONLY) Ð IF
EQUIPPED
E-85 General Information
The information in this section is for Flexible Fuel ve-
hicles only. These vehicles can be identified by a unique,
yellow fuel filler cap (gas cap) that statesEthanol (E-85)/
Unleaded Gasoline,and by theFLEXFUELbadge that
will be located on the body of your vehicle. This section
only covers those subjects that are unique to these
vehicles. Please refer to the other sections of this manual
for information on features that are common between
Flexible Fuel and gasoline only powered vehicles.
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þAn electronically actuated trailer brake controller is
required when towing a trailer with electronically
actuated brakes. When towing a trailer equipped with
a hydraulic surge actuated brake system, an electronic
brake controller is not required.
þTrailer brakes are recommended for trailers over 1,000
lbs (454 kg) and required for trailers in excess of 2,000
lbs (907 kg).
CAUTION!
If the trailer weighs more than 1,000 lbs (454 kg)
loaded, it should have its own brakes and they
should be of adequate capacity. Failure to do this
could lead to accelerated brake lining wear, higher
brake pedal effort, and longer stopping distances.
WARNING!
Do not connect trailer brakes to your vehicle's hy-
draulic brake lines. It can overload your brake sys-
tem and cause it to fail. You might not have brakes
when you need them and could have an accident.
Towing any trailer will increase your stopping dis-
tance. When towing you should allow for additional
space between your vehicle and the vehicle in front
of you. Failure to do so could result in an accident.
Towing Requirements Ð Trailer Lights & Wiring
Whenever you pull a trailer, regardless of the trailer size,
stop lights and turn signals on the trailer are required for
motoring safety.
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The Trailer Tow Package may includea4and7pin
wiring harness. Use a factory approved trailer harness
and connector.
The electrical connections are all complete to the vehicle
but you must mate the harness to a trailer connector.
Refer to the following illustrations.
Towing Tips
Before setting out on a trip, practice turning, stopping
and backing the trailer in an area away from heavy
traffic.
4 - Pin Connector
7- Pin Connector
362 STARTING AND OPERATING

Towing Tips Ð Automatic Transmission
The ªDº range can be selected when towing. However, if
frequent shifting occurs while in this range, the ºTow/
Haulº mode (if equipped) or a lower gear range should
be selected.
NOTE:Using the ºTow/Haulº 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 the ªMain-
tenance Scheduleº in Section 8 of this manual for trans-
mission fluid change intervals.
NOTE:Check the automatic transmission fluid level
before towing.
Towing Tips Ð Electronic Speed Control (If
Equipped)
þ
Don't use in hilly terrain or with heavy loads.
þWhen 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.
þUse speed control in flat terrain and with light loads to
maximize fuel efficiency.
Towing Tips Ð Cooling System
To reduce potential for engine and transmission over-
heating, take the following actions:
þCity Driving
When stopped for short periods of time, put transmission
in N (Neutral) and increase engine idle speed.
þHighway Driving
Reduce speed.
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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 recre-
ational 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) ªpinº 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 (stayon solid) when Neutral shift is complete. A ª4WD
SYSTEM IN NEUTRALº message will display on the
EVIC (Electronic Vehicle Information Center). Refer to
ªElectronic Vehicle Information Center (EVIC)º in Sec-
tion 4 of this manual.
Neutral Switch
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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).
Hold down N (Neutral) ªpinº 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 ª4WD SYSTEM IN
NEUTRALº message will no longer be displayed on the
EVIC (Electronic Vehicle Information Center). Refer to
ªElectronic Vehicle Information Center (EVIC)º in Sec-
tion 4 of this manual.5. Shift transmission into P (Park).
6. Start the engine.
7. Shift transmission into D (Drive).
NOTE:
When shifting out of transfer case N (Neutral),
turning the engine OFF may be required to avoid gear clash.
Neutral Switch
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