2012 JEEP GRAND CHEROKEE engine

MULTI-DISPLACEMENT SYSTEM
(MDS) (IF EQUIPPED) — 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.
PARKING BRAKEBefore leaving the vehicle, make sure that the
parking brake is fully applied and place the
shift lever in the PARK position.
The foot operated parking brake is located
below the lower left corner of the instrument
panel. To apply the park brake, firmly push the
park brake pedal fully. To release the parking
brake, press the park brake pedal a second
time and let your foot up as you feel the brake
disengage.When the parking brake is applied with the
ignition switch in the ON position, the “Brake
Warning Light” in the instrument cluster will
illuminate.
NOTE:
•
When the parking brake is applied and the
transmission is placed in gear, the “Brake
Warning Light” will flash. If vehicle speed
is detected, a chime will sound to alert the
driver. Fully release the parking brake
before attempting to move the vehicle. •
This light only shows that the parking
brake is applied. It does not show the
degree of brake application.
When parking on a hill, it is important to turn the
front wheels toward the curb on a downhill
grade and away from the curb on an uphill
grade. Apply the parking brake before placing
the shift lever in PARK, otherwise the load on
the transmission locking mechanism may make
it difficult to move the shift lever out of PARK.
The parking brake should always be applied
whenever the driver is not in the vehicle.WARNING!
• Never use the PARK position as a substi-
tute for the parking brake. Always apply the
parking brake fully when parked to guard
against vehicle movement and possible
injury or damage.
(Continued)
Parking Brake
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WARNING!
The ABS cannot prevent the natural laws of
physics from acting on the vehicle, nor can it
increase the traction afforded by prevailing
road conditions. The ABS cannot prevent ac-
cidents, including those resulting from exces-
sive speed in turns, driving on very slippery
surfaces, or hydroplaning. The capabilities of
an ABS-equipped vehicle must never be ex-
ploited in a reckless or dangerous manner
which could jeopardize the user’s safety or the
safety of others.
Traction Control System (TCS)
This system monitors the amount of wheel spin
of each of the driven wheels. If wheel spin is
detected, brake pressure is applied to the
slipping wheel(s) and engine power is reduced
to provide enhanced acceleration and stability.
A feature of the TCS system, Brake Limited
Differential (BLD), functions similar to a limited-
slip differential and controls the wheel spin
across a driven axle. If one wheel on a driven
axle is spinning faster than the other, the sys-tem will apply the brake of the spinning wheel.
This will allow more engine torque to be applied
to the wheel that is not spinning. This feature
remains active even if ESC system is in the
“Partial Off” mode. Refer to “Electronic Stability
Control (ESC)” in this section for further infor-
mation.
Brake Assist System (BAS)The BAS is designed to optimize the vehicle’s
braking capability during emergency braking
maneuvers. The system detects an emergency
braking situation by sensing the rate and
amount of brake application and then applies
optimum pressure to the brakes. This can help
reduce braking distances. The BAS comple-
ments the anti-lock brake system (ABS). Apply-
ing the brakes very quickly results in the best
BAS assistance. To receive the benefit of the
system, you must apply
continuousbraking
pressure during the stopping sequence (do not
“pump” the brakes). Do not reduce brake pedal
pressure unless braking is no longer desired.
Once the brake pedal is released, the BAS is
deactivated.
WARNING!
The BAS cannot prevent the natural laws of
physics from acting on the vehicle, nor can it
increase the traction afforded by prevailing
road conditions. The BAS cannot prevent
accidents, including those resulting from ex-
cessive speed in turns, driving on very slip-
pery surfaces, or hydroplaning. The capabili-
ties of a BAS-equipped vehicle must never be
exploited in a reckless or dangerous manner
which could jeopardize the user’s safety or the
safety of others.
Electronic Roll Mitigation (ERM)This system anticipates the potential for wheel
lift by monitoring the driver’s steering wheel
input and the speed of the vehicle. When ERM
determines that the rate of change of the steer-
ing wheel angle and vehicle speed are suffi-
cient to potentially cause wheel lift, it then
applies the brake of the appropriate wheel and
may also reduce engine power to lessen the
chance that wheel lift will occur. ERM will only
intervene during very severe or evasive driving
maneuvers.
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ERM can only reduce the chance of wheel lift
occurring during severe or evasive driving ma-
neuvers. It cannot prevent wheel lift due to
other factors such as road conditions, leaving
the roadway or striking objects or other ve-
hicles.
WARNING!
Many factors, such as vehicle loading, road
conditions and driving conditions, influence
the chance that wheel lift or rollover may
occur. ERM cannot prevent all wheel lift or
rollovers, especially those that involve leaving
the roadway or striking objects or other ve-
hicles. The capabilities of an ERM-equipped
vehicle must never be exploited in a reckless
or dangerous manner which could jeopardize
the user’s safety or the safety of others.
Electronic Stability Control (ESC)
This system enhances directional control and
stability of the vehicle under various driving
conditions. ESC corrects for oversteering or
understeering of the vehicle by applying the
brake of the appropriate wheel to assist incounteracting the oversteer or understeer con-
dition. Engine power may also be reduced to
help the vehicle maintain the desired path.
ESC uses sensors in the vehicle to determine
the vehicle path intended by the driver and
compares it to the actual path of the vehicle.
When the actual path does not match the
intended path, ESC applies the brake of the
appropriate wheel to assist in counteracting the
oversteer or understeer condition.
•
Oversteer - when the vehicle is turning more
than appropriate for the steering wheel po-
sition.
• Understeer - when the vehicle is turning less
than appropriate for the steering wheel po-
sition.
The “ESC Activation/Malfunction Indicator
Light” located in the instrument cluster will start
to flash as soon as the tires lose traction and
the ESC system becomes active. The “ESC
Activation/Malfunction Indicator Light” also
flashes when the TCS is active. If the “ESC
Activation/Malfunction Indicator Light” begins
to flash during acceleration, ease up on the
accelerator and apply as little throttle as pos- sible. Be sure to adapt your speed and driving
to the prevailing road conditions.
WARNING!
The Electronic Stability Control (ESC) cannot
prevent the natural laws of physics from act-
ing on the vehicle, nor can it increase the
traction afforded by prevailing road condi-
tions. ESC cannot prevent accidents, includ-
ing those resulting from excessive speed in
turns, driving on very slippery surfaces, or
hydroplaning. The capabilities of an ESC
equipped vehicle must never be exploited in a
reckless or dangerous manner which could
jeopardize the user’s safety or the safety of
others.
The ESC system has two available operating
modes in 4WD HIGH range, and one operating
mode in 4WD LOW range.
High Range (Four-Wheel Drive Models)
On
This is the normal operating mode for ESC in
4WD HIGH range. Whenever the vehicle is 247

started or the transfer case (if equipped) is
shifted from 4WD LOW range or NEUTRAL
back to 4WD HIGH range, the ESC system will
be in this “On” mode. This mode should be
used for most driving situations. ESC should
only be turned to “Partial Off” mode for specific
reasons as noted below.
Partial Off
This mode is entered by momentarily pressing
the “ESC OFF” switch. When in “Partial Off”
mode, the TCS portion of ESC, except for the
BLD feature described in the TCS section, has
been disabled and the “ESC Off Indicator
Light” will be illuminated. All other stability
features of ESC function normally. This mode is
intended to be used if the vehicle is in deep
snow, sand, or gravel conditions and more
wheel spin than ESC would normally allow is
required to gain traction. To turn ESC on again,
momentarily press the “ESC OFF” switch. This
will restore the normal “ESC On” mode of
operation.
When in “Partial Off” mode, the TCS function-
ality of ESC, (except for the limited slip feature
described in the TCS section), has been dis-
abled and the “ESC Off Indicator Light” will beilluminated. All other stability features of ESC
function normally. When in “Partial Off” mode,
the engine power reduction feature of TCS is
disabled, and the enhanced vehicle stability
offered by the ESC system is reduced.
NOTE:
To improve the vehicle’s traction when driv-
ing with snow chains, or starting off in deep
snow, sand, or gravel, it may be desirable to
switch to the “Partial Off” mode by pressing
the “ESC OFF” switch. Once the situation
requiring ESC to be switched to the “Partial
Off” mode is overcome, turn ESC back on by
momentarily pressing the “ESC OFF”
switch. This may be done while the vehicle
is in motion.
4WD Low Range
Partial Off
This is the normal operating mode for ESC in
4WD LOW range. Whenever the vehicle is
started in 4WD LOW range, or the transfer case
(if equipped) is shifted from 4WD HIGH range
or NEUTRAL to 4WD LOW range, the ESC
system will be in the “Partial Off” mode.
Trailer Sway Control (TSC)TSC uses sensors in the vehicle to recognize
an excessively swaying trailer and will take the
appropriate actions to attempt to stop the sway.
The system may reduce engine power and
apply the brake of the appropriate wheel(s) to
counteract the sway of the trailer. TSC will
become active automatically once an exces-
sively swaying trailer is recognized. No driver
action is required. Note that TSC cannot stop all
trailers from swaying. Always use caution when
towing a trailer and follow the trailer tongue
weight recommendations. Refer to “Trailer Tow-
ing” in “Starting and Operating” for further
ESC OFF Switch
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information. When TSC is functioning, the “ESC
Activation/Malfunction Indicator Light” will
flash, the engine power may be reduced and
you may feel the brakes being applied to
individual wheels to attempt to stop the trailer
from swaying. TSC is disabled when the ESC
system is in the “Partial Off” mode.
WARNING!
If TSC activates while driving, slow the vehicle
down, stop at the nearest safe location, and
adjust the trailer load to eliminate trailer sway.
Hill Start Assist (HSA)The HSA system is designed to assist the driver
when starting a vehicle from a stop on a hill.
HSA will maintain the level of brake pressure
the driver applied for a short period of time after
the driver takes their foot off of the brake pedal.
If the driver does not apply the throttle during
this short period of time, the system will release
brake pressure and the vehicle will roll down
the hill. The system will release brake pressure
in proportion to the amount of throttle applied
as the vehicle starts to move in the intended
direction of travel.HSA Activation Criteria
The following criteria must be met in order for
HSA to activate:
•
Vehicle must be stopped.
• Vehicle must be on a 6% (approximate)
grade or greater hill.
• Gear selection matches vehicle uphill direc-
tion (i.e., vehicle facing uphill is in forward
gear; vehicle backing uphill is in REVERSE
gear).
HSA will work in REVERSE and all forward
gears when the activation criteria have been
met. The system will not activate if the vehicle is
placed in NEUTRAL or PARK.
WARNING!
There may be situations on minor hills (i.e.,
less than 8%), with a loaded vehicle, or while
pulling a trailer, when the system will not
activate and slight rolling may occur. This
could cause a collision with another vehicle or
object. Always remember the driver is respon-
sible for braking the vehicle. Towing With HSA
HSA will provide assistance when starting on a
grade when pulling a trailer.
WARNING!
•
If you use a trailer brake controller with your
trailer, your trailer brakes may be activated
and deactivated with the brake switch. If so,
when the brake pedal is released, there
may not be enough brake pressure to hold
the vehicle and trailer on a hill and this
could cause a collision with another vehicle
or object behind you. In order to avoid
rolling down the hill while resuming accel-
eration, manually activate the trailer brake
prior to releasing the brake pedal. Always
remember the driver is responsible for
braking the vehicle.
(Continued)
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HDC control speed. Conversely, if more speed
is desired during HDC control, the accelerator
pedal will increase vehicle speed in the usual
manner. When either the brake or the accelera-
tor is released, HDC will control the vehicle
back to the original set speed.
HDC Operation in 4WD Low Range
To enable HDC, press the HDC switch or put
the Selec-Terrain™ system in the “ROCK”
mode. The HDC icon will be illuminated in the
instrument cluster and HDC will function. If the
vehicle speed goes above 20 mph (32 km/h),
the HDC icon will flash and HDC will not
function. To disable HDC, press the HDC
switch.
4WD Low Range Set Speeds
•1st = 1 mph (1.6 km/h)
• 2nd = 2.5 mph (4 km/h)
• 3rd = 4 mph (6 km/h)
• 4th = 5.5 mph (9 km/h)
• 5th or D (Drive) = 7.5 mph (12 km/h)
• REVERSE = 1 mph (1.6 km/h)
• NEUTRAL = 2.5 mph (4 km/h) •
PARK = HDC will not function
HDC is intended for low speed off-road driv-
ing only. At vehicle speeds above 20 mph
(32 km/h), HDC will no longer function. When
the vehicle speed drops below 20 mph
(32 km/h), HDC function will automatically re-
sume and the vehicle speed will return to the
chosen set speed.
WARNING!
HDC is only intended to assist the driver in
controlling vehicle speed when descending
hills. The driver must remain attentive to the
driving conditions and is responsible for main-
taining a safe vehicle speed.
ESC Activation/Malfunction Indicator
Light and ESC OFF Indicator Light
The “ESC Activation/Malfunction
Indicator Light” in the instrument
cluster will come on when the igni-
tion switch is turned to the ON
position. It should turn off with the
engine running. If the “ESC
Activation/Malfunction Indicator Light” comes on continuously with the engine running, a
malfunction has been detected in the ESC
system. If this light remains on after several
ignition cycles, and the vehicle has been driven
several miles (kilometers) at speeds greater
than 30 mph (48 km/h), see your authorized
dealer as soon as possible to have the problem
diagnosed and corrected.
The “ESC Activation/Malfunction Indicator
Light” (located in the instrument cluster) starts
to flash as soon as the tires lose traction and
the ESC system becomes active. The “ESC
Activation/Malfunction Indicator Light” also
flashes when TCS is active. If the “ESC
Activation/Malfunction Indicator Light” begins
to flash during acceleration, ease up on the
accelerator and apply as little throttle as pos-
sible. Be sure to adapt your speed and driving
to the prevailing road conditions.
NOTE:
•
The “ESC Activation/Malfunction Indica-
tor Light” and the “ESC OFF Indicator
Light” come on momentarily each time
the ignition switch is turned ON.
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Telltale Lightwill flash on and off for 75 sec-
onds and then turn off, and the Electronic
Vehicle Information Center (EVIC) will display
the “SERVICE TPM SYSTEM” message. The
EVIC will also display pressure values in place
of the dashes. On the next ignition switch cycle
the SERVICE TPM SYSTEM message will no
longer be displayed as long as no system fault
exists.
General InformationTransmitter and receivers operate on a carrier
frequency of 433.92 MHz as required by EEC
regulations. These devices must be certified to
conform to specific regulations in each indi-
vidual country. Two sets of regulations are
involved: ETS (European Telecommunication
Standard) 300–220, which most countries use,
and German BZT federal regulation 225Z125,
which is based on ETC 300–220 but has addi-
tional unique requirements. Other defined re-
quirements are noted in ANNEX VI of COMMIS-
SION DIRECTIVE 95/56/EC. Operation is
subject to the following conditions:
• This device may not cause harmful interfer-
ence. •
This device must accept any interference
received, including interference that may
cause undesired operation.
FUEL REQUIREMENTS —
GASOLINE ENGINE
3.6L Engine
These engines are designed to meet all emis-
sions regulations and provide excellent fuel
economy and performance when using high-
quality unleaded gasoline with a minimum re-
search octane rating of 91. The use of premium
gasoline is not recommended, as it will not
provide any benefit over regular gasoline in
these engines.
5.7L EngineTheses engines are designed to meet all emis-
sions regulations and provide satisfactory fuel
economy and performance when using high-
quality unleaded gasoline having an octane
range of 91 to 95. The manufacturer recom-
mends the use of 95 octane for optimum per-
formance. The use of premium gasoline is not
recommended, as it will not provide any benefit
over regular gasoline in these engines. Light spark knock at low engine speeds is not
harmful to your engine. However, continued
heavy spark knock at high speeds can cause
damage, and immediate service is required.
Poor quality gasoline can cause problems such
as hard starting, stalling, and hesitations. If you
experience these symptoms, try another brand
of gasoline before considering service for the
vehicle.
Over 40 auto manufacturers worldwide have
issued and endorsed consistent gasoline
specifications (the Worldwide Fuel Charter,
WWFC) which define fuel properties necessary
to deliver enhanced emissions, performance,
and durability for your vehicle. The manufac-
turer recommends the use of gasoline that
meets the WWFC specifications if they are
available.
Besides using unleaded gasoline with the
proper octane rating, gasolines that contain
detergents, corrosion and stability additives
are recommended. Using gasolines that have
these additives may help improve fuel
economy, reduce emissions, and maintain ve-
hicle performance.
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Poor quality gasoline can cause problems such
as hard starting, stalling and stumble. If you
experience these problems, try another brand
of gasoline before considering service for the
vehicle.
Methanol
(Methyl or Wood Alcohol) is used in a variety of
concentrations when blended with unleaded
gasoline. You may find fuels containing 3% or
more Methanol along with other alcohols called
cosolvents. Problems that result from using
Methanol/gasoline or E-85 Ethanol blends are
not the responsibility of the manufacturer. While
MTBE is an oxygenate made from Methanol, it
does not have the negative effects of Methanol.
CAUTION!
Do not use gasolines containing Methanol or
E-85 Ethanol. Use of these blends may result
in starting and driveability problems and may
damage critical fuel system components.Ethanol
The manufacturer recommends that your ve-
hicle be operated on fuel containing no more
than 10% Ethanol. Purchasing your fuel from a
reputable supplier may reduce the risk of ex-
ceeding this 10% limit and/or of receiving fuel
with abnormal properties. It should also be
noted that an increase in fuel consumption
should be expected when using Ethanol-
blended fuels, due to the lower energy content
of Ethanol.
Problems that result from using Methanol/
gasoline or E-85 Ethanol blends are not the
responsibility of the manufacturer. While MTBE
is an oxygenate made from Methanol, it does
not have the negative effects of Methanol.CAUTION!
Use of fuel with Ethanol content higher than
10% may result in engine malfunction, starting
and operating difficulties and materials degra-
dation. These adverse effects could result in
permanent damage to your vehicle.Clean Air Gasoline
Many gasolines are now being blended that
contribute to cleaner air, especially in those
areas where air pollution levels are high. These
new blends provide a cleaner burning fuel and
some are referred to as “reformulated gaso-
line.”
The manufacturer supports these efforts toward
cleaner air. You can help by using these blends
as they become available.
MMT in Gasoline
MMT is a manganese containing metallic addi-
tive that is blended into some gasoline to
increase octane. Gasoline blended with MMT
provides no performance advantage beyond
gasoline of the same octane number without
MMT. Gasoline blended with MMT reduces
spark plug life and reduces emission system
performance in some vehicles. The manufac-
turer recommends that gasoline without MMT
be used in your vehicle. The MMT content of
gasoline may not be indicated on the gasoline
pump; therefore, you should ask your gasoline
retailer whether or not his/her gasoline contains
MMT.
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