2013 JEEP GRAND CHEROKEE differential

Quadra-Drive® II System – If Equipped
The optional Quadra-Drive® II System features two
torque transfer couplings. The couplings include an
Electronic Limited-Slip Differential (ELSD) rear axle and
the Quadra-Trac II® transfer case. The optional ELSD
axle is fully automatic and requires no driver input to
operate. Under normal driving conditions, the unit func-
tions as a standard axle, balancing torque evenly between
left and right wheels. With a traction difference between
left and right wheels, the coupling will sense a speed
difference. As one wheel begins to spin faster than the
other, torque will automatically transfer from the wheel
that has less traction, to the wheel that has traction. While
the transfer case and axle coupling differ in design, their
operation is similar. Follow the Quadra-Trac II® transfer
case shifting information, preceding this section, for
shifting this system.
SELEC-TERRAIN™ — IF EQUIPPED
Description
Selec-Terrain™ combines the capabilities of the vehicle
control systems, along with driver input, to provide the
best performance for all terrains.
Selec-Terrain™ Switch
5
STARTING AND OPERATING 473

Quadra-Lift™ – If Equipped
When off-roading, it is recommended that the lowest
useable vehicle height that will clear the current obstacle
or terrain be selected. The vehicle height should then be
raised as required by the changes in terrain.
The Selec-Terrain™ switch will automatically change the
vehicle to the optimized height based on the Selec-
Terrain™ switch position. The vehicle height can be
changed from the default height for each Selec-Terrain™
mode by normal use of the air suspension switches. Refer
to “Quadra-Lift™ – If Equipped” in “Starting and Oper-
ating” for further information.
When To Use 4WD LOW Range – If Equipped
When off-road driving, shift to 4WD LOW for additional
traction. This range should be limited to extreme situa-
tions such as deep snow, mud, or sand where additionallow speed pulling power is needed. Vehicle speeds in
excess of 25 mph (40 km/h) should be avoided when in
4WD LOW range.
WARNING!
Do not drive in 4WD-LOW Range on dry pavement;
driveline damage may result. 4WD-LOW Range
locks front and rear drivelines together and does not
allow for differential action between the front to rear
driveshafts. Driving in 4WD-LOW on pavement will
cause driveline binding andcrow-hop; use only on
wet or slippery surfaces.
Driving Through Water
Although your vehicle is capable of driving through
water, there are a number of precautions that must be
considered before entering the water.
5
STARTING AND OPERATING 483

ELECTRONIC BRAKE CONTROL SYSTEM
Your vehicle is equipped with an advanced electronic brake
control system that includes the Anti-Lock Brake System
(ABS), Traction Control System (TCS), Brake Assist System
(BAS), Electronic Roll Mitigation (ERM), and Electronic
Stability Control (ESC). All five of these systems work
together to enhance vehicle stability and control in various
driving conditions.
Also, your vehicle is equipped with Trailer Sway Control
(TSC), Hill Start Assist (HSA), Brake Lock Differential (BLD),
Ready Alert Braking, Rain Brake Support and, if it has
four-wheel drive with the MP 3023 two-speed transfer case,
Hill Descent Control (HDC).
Anti-Lock Brake System (ABS)
This system aids the driver in maintaining vehicle control
under adverse braking conditions. The system controls
hydraulic brake pressure to prevent wheel lock-up and help
avoid skidding on slippery surfaces during braking. Refer to“Anti-Lock Brake System” in “Starting and Operating” for
further information.
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 collisions, including those resulting
from excessive speed in turns, driving on very slippery
surfaces, or hydroplaning. The capabilities of an ABS-
equipped vehicle must never be exploited 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.
494 STARTING AND OPERATING

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
system 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 “Elec-
tronic Stability Control (ESC)” in this section for further
information.
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 sens-
ing the rate and amount of brake application and then
applies optimum pressure to the brakes. This can help
reduce braking distances. The BAS complements the
anti-lock brake system (ABS). Applying the brakes veryquickly results in the best BAS assistance. To receive the
benefit of the system, you must applycontinuousbrak-
ing 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 phys-
ics from acting on the vehicle, nor can it increase
the traction afforded by prevailing road conditions.
•The BAS cannot prevent collisions, including those
resulting from excessive speed in turns, driving on
very slippery surfaces, or hydroplaning.
•The capabilities 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.5
STARTING AND OPERATING 495

Cavity Car-
tridge
FuseMini
FuseDescription
J13 60 Amp
YellowMain Ignition Off
Draw (IOD)
J14 20 Amp
BlueTrailer Tow
Lamps/Park Lamps
J15 40 Amp
GreenFront Cabin Fan/
Blower
J17 40 Amp
GreenStarter Motor
Solenoid
J18 20 Amp
BluePowertrain Control
Module/Powertrain
Control Module/
Transmission RangeCavity Car-
tridge
FuseMini
FuseDescription
J19 60 Amp
YellowRadiator Fan Motor
HI/Radiator Fan
Motor Low
J20 30 Amp
PinkFront Wiper
J21 20 Amp
BlueFront/Rear Washer
Control
J22 25 Amp
NaturalSunroof Module
M1 15 Amp
BlueStop Lamps
M2 20 Amp
YellowElectronic Limit
Slip Differential/
Air Suspension
7
MAINTAINING YOUR VEHICLE 647

Chassis
Component Fluid, Lubricant, or Genuine Part
Automatic Transmission We recommend you only use MOPAR® ATF+4®
Automatic Transmission Fluid. Failure to use ATF+4
fluid may affect the function or performance of your
transmission.
Transfer Case – Single-Speed (Quadra-Trac I®) We recommend you use Shell Automatic Transmission
Fluid 3353.
Transfer Case – Two-Speed (Quadra-Trac II®) We recommend you use MOPAR® ATF+4® Automatic
Transmission Fluid.
Axle Differential (Front-Rear) We recommend you use MOPAR GL-5 Synthetic Axle
Lubricant SAE 75W-85
Axle Differential (Rear) – 5.7L Engine With Electronic
Limited-Slip Differential (ELSD)We recommend you use MOPAR GL-5 Synthetic Axle
Lubricant SAE 75W-85 with friction modifier additive.
Axle Differential (Rear) – 5.7L Engine Without Electronic
Limited-Slip Differential (ELSD)We recommend you use MOPAR GL-5 Synthetic Axle
Lubricant SAE 75W-85.
7
MAINTAINING YOUR VEHICLE 661

Four Wheel Drive Operation.................467
Freeing A Stuck Vehicle.....................597
Front Axle (Differential).....................634
Fuel...................................541
Adding..............................550
Additives............................544
Clean Air............................542
Conserving...........................330
Ethanol..............................542
Filler Cap (Gas Cap)....................550
Gasoline.............................541
Gauge...............................311
Light...............................325
Materials Added.......................544
Methanol............................542
Octane Rating.........................541
Requirements.........................541
Saver Mode...........................330
Tank Capacity.........................659Fuel, Flexible............................546
Fueling................................550
Fuel Optimizer...........................330
Fuel Saver..............................330
Fuel System Caution.......................551
Fuses..................................645
Garage Door Opener (HomeLink®)............260
Gas Cap (Fuel Filler Cap)...................550
Gasoline, Clean Air........................542
Gasoline (Fuel)...........................541
Conserving...........................330
Gasoline, Reformulated.....................542
Gauges
Coolant Temperature....................312
Fuel................................311
Speedometer..........................311
Tachometer
...........................303
Gear Ranges.............................449
688 INDEX

Power
Door Locks............................35
Inverter..............................281
Lift Gate..............................48
Mirrors..............................125
Outlet (Auxiliary Electrical Outlet)..........277
Seats................................173
Steering.............................487
Sunroof..............................269
Tilt/Telescoping Steering Column...........213
Windows.............................42
Pregnant Women and Seat Belts................68
Preparation for Jacking.....................585
Pretensioners
Seat Belts.............................63
Programmable Electronic Features.............338
Programming Transmitters
(Remote Keyless Entry)....................24Quadra-Lift.............................476
Quadra-Trac.............................467
Radial Ply Tires..........................521
Radiator Cap (Coolant Pressure Cap)...........630
Radio Operation..........................417
Radio Remote Controls.....................415
Rain Sensitive Wiper System.................210
Rear Axle (Differential).....................634
Rear Camera............................255
Rear Cross Path..........................133
Rear Cupholder..........................282
Rear Park Sense System.....................246
Rear Seat, Folding.........................187
Rear Window Features.....................293
Rear Wiper/Washer........................293
Reclining Front Seats.......................178
Recorder, Event Data.......................82
694 INDEX