wheel JEEP GRAND CHEROKEE 2012 WK2 / 4.G Service Manual

Four-Wheel Drive Operation ............. 440
▫ Quadra-Trac I Operating Instructions/
Precautions – If Equipped .............. 440
▫ Quadra-Trac II Operating Instructions/
Precautions – If Equipped .............. 441
▫ Shift Positions ...................... 442
▫ Shifting Procedures ................... 443
▫ Quadra-Drive II System – If Equipped .... 445
 Selec-Terrain™ — If Equipped ............ 446
▫ Description ........................ 446
▫ Electronic Vehicle Information Center (EVIC)
Display Messages .................... 448
 Quadra-Lift™ — If Equipped ............. 448
▫ Description ........................ 448 ▫
Electronic Vehicle Information Center
(EVIC) Display Messages ............... 451
▫ Operation ......................... 452
 On-Road Driving Tips .................. 453
 Off-Road Driving Tips .................. 454
▫ Quadra-Lift™ – If Equipped ............ 454
▫ When To Use 4WD Low Range –
If Equipped ........................ 454
▫ Driving Through Water ................ 455
▫ Driving In Snow, Mud And Sand ......... 456
▫ Hill Climbing ....................... 456
▫ Traction Downhill .................... 457
▫ After Driving Off-Road ................ 458
408 STARTING AND OPERATING

Power Steering ....................... 459
▫ 3.6L Engine ........................ 459
▫ 5.7L Engine ........................ 460
▫ Power Steering Fluid Check ............. 461
 Multi-Displacement System (MDS)
(If Equipped) — 5.7L Engine Only .......... 462
 Parking Brake ........................ 462
 Electronic Brake Control System ........... 464
▫ Anti-Lock Brake System (ABS) ........... 464
▫ Traction Control System (TCS) ........... 465
▫ Brake Assist System (BAS) .............. 465
▫ Electronic Roll Mitigation (ERM) ......... 466
▫ Electronic Stability Control (ESC) ......... 467▫
Trailer Sway Control (TSC) ............. 470
▫ Hill Start Assist (HSA) ................ 471
▫ Ready Alert Braking – If Equipped ........ 473
▫ Rain Brake Support – If Equipped ........ 473
▫ Hill Descent Control (HDC) — Four-Wheel
Drive Models With MP3023 Two-Speed
Transfer Case Only ................... 474
▫ ESC Activation/Malfunction Indicator Light
And ESC Off Indicator Light ............ 476
 Tire Safety Information ................. 477
▫ Tire Markings ....................... 477
▫ Tire Identification Number (TIN) ......... 481
▫ Tire Terminology And Definitions ......... 482
▫ Tire Loading And Tire Pressure .......... 483
5
STARTING AND OPERATING 409

Tires — General Information ............. 487
▫ Tire Pressure ....................... 487
▫ Tire Inflation Pressures ................ 488
▫ Tire Pressures For High Speed Operation . . . 490
▫ Radial-Ply Tires ..................... 490
▫ Spare Tire Matching Original Equipped Tire
And Wheel – If Equipped .............. 490
▫ Compact Spare Tire – If Equipped ........ 491
▫ Full Size Spare – If Equipped ............ 492
▫ Limited-Use Spare – If Equipped ......... 492
▫ Tire Spinning ....................... 493
▫ Tread Wear Indicators ................. 494
▫ Life Of Tire ........................ 494 ▫
Replacement Tires .................... 495
 Tire Chains (Traction Devices) ............. 496
 Snow Tires .......................... 498
 Tire Rotation Recommendations ........... 498
 Tire Pressure Monitor System (TPMS) ....... 499
▫ Base System ........................ 502
▫ Premium System – If Equipped .......... 504
▫ General Information .................. 508
 Fuel Requirements ..................... 509
▫ 3.6L Engine ........................ 509
▫ 5.7L Engine ........................ 509
▫ Reformulated Gasoline ................ 510
▫ Gasoline/Oxygenate Blends ............. 510
410 STARTING AND OPERATING

▫Towing Requirements ................. 531
▫ Towing Tips ........................ 536
 Snow Plow .......................... 537
 Recreational Towing
(Behind Motorhome, Etc.) ................ 538
▫ Towing This Vehicle Behind
Another Vehicle ..................... 538 ▫
Recreational Towing – Two-Wheel Drive
Models ........................... 539
▫ Recreational Towing – Quadra-Trac I
(Single-Speed Transfer Case) Four-Wheel
Drive Models ....................... 539
▫ Recreational Towing – Quadra–Trac II /
Quadra–Drive II Four-Wheel
Drive Models ....................... 540
412 STARTING AND OPERATING

PARK
This range supplements the parking brake by locking the
transmission. The engine can be started in this range.
Never attempt to use PARK while vehicle is in motion.
Apply the parking brake when leaving vehicle in this
range.
When parking on a level surface, you may place the shift
lever in the PARK position first, and then apply the
parking brake.
When parking on a hill, 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. As an added precau-
tion, turn the front wheels toward the curb on a downhill
grade and away from the curb on an uphill grade.WARNING!
•Never use the PARK position as a substitute for
the parking brake. Always apply the parking
brake fully when parked to guard against vehicle
movement and possible injury or damage.
•Your vehicle could move and injure you and others
if it is not completely in PARK. Check by trying to
move the shift lever rearward (with the brake
pedal released), after you have placed it in PARK.
Make sure the transmission is in PARK before
leaving the vehicle.(Continued)
5
STARTING AND OPERATING 423

To exit ERS mode, simply press and hold the shift lever to
the right (+) until “D” is once again displayed in the shift
lever position indicator in the instrument cluster.
WARNING!
Do not downshift for additional engine braking on a
slippery surface. The drive wheels could lose their
grip and the vehicle could skid, causing an accident
or personal injury.
Screen Display12 34D
Actual Gear(s)
Allowed 1 1-2 1-3 1-4 1-5
NOTE: To select the proper gear position for maximum
deceleration (engine braking), simply press and hold the
shift lever to the left (-). The transmission will shift to the
range from which the vehicle can best be slowed down.
Overdrive Operation
The automatic transmission includes an electronically
controlled Overdrive (fifth gear). The transmission will
automatically shift into the Overdrive gear if the follow-
ing conditions are present:
•the shift lever is in the DRIVE position,
•vehicle speed is sufficiently high, and
•the driver is not heavily pressing the accelerator.
Six-Speed Automatic Transmission
(5.7L Engine) — If Equipped
The shift lever position display (located in the instrument
panel cluster) indicates the transmission gear range. You
must press the brake pedal to move the shift lever out of
the PARK position (refer to “Brake/Transmission Shift
Interlock System” in this section). To drive, move the shift
lever from PARK or NEUTRAL to the DRIVE position.
5
STARTING AND OPERATING 429

PARK
This range supplements the parking brake by locking the
transmission. The engine can be started in this range.
Never attempt to use PARK while vehicle is in motion.
Apply the parking brake when leaving vehicle in this
range.
When parking on a level surface, you may place the shift
lever in the PARK position first, and then apply the
parking brake.
When parking on a hill, 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. As an added precau-
tion, turn the front wheels toward the curb on a downhill
grade and away from the curb on an uphill grade.WARNING!
•Never use the PARK position as a substitute for
the parking brake. Always apply the parking
brake fully when parked to guard against vehicle
movement and possible injury or damage.
•Your vehicle could move and injure you and others
if it is not completely in PARK. Check by trying to
move the shift lever rearward (with the brake
pedal released), after you have placed it in PARK.
Make sure the transmission is in PARK before
leaving the vehicle.(Continued)
5
STARTING AND OPERATING 431

gear as the top available gear. Once in ERS mode, tapping
the shift lever to the left (-) or right (+) will change the top
available gear.
To exit ERS mode, simply press and hold the shift lever to
the right (+) until “D” is once again displayed in the shift
lever position indicator in the instrument cluster.
WARNING!
Do not downshift for additional engine braking on a
slippery surface. The drive wheels could lose their
grip and the vehicle could skid, causing an accident
or personal injury.
Screen
Display123456D
Actual Gear(s)
Allowed 1 1-2 1-3 1,2,4 1,2,
4,51,2,
4-6 1-5 NOTE:
To select the proper gear position for maximum
deceleration (engine braking), simply press and hold the
shift lever to the left (-). The transmission will shift to the
range from which the vehicle can best be slowed down.
Overdrive Operation
The automatic transmission includes an electronically
controlled Overdrive (fourth and fifth gears). The trans-
mission will automatically shift into the Overdrive gear if
the following conditions are present:
•the shift lever is in the DRIVE position,
•the transmission fluid has reached an adequate tem-
perature,
•the engine coolant has reached an adequate temperature,
•vehicle speed is sufficiently high,
•the driver is not heavily pressing the accelerator, and
•the TOW/HAUL switch has not been activated.
438 STARTING AND OPERATING

Torque Converter Clutch
A feature designed to improve fuel economy has been
included in the automatic transmission on your vehicle.
A clutch within the torque converter engages automati-
cally at calibrated speeds. This may result in a slightly
different feeling or response during normal operation in
the upper gears. When the vehicle speed drops or during
some accelerations, the clutch automatically disengages.
NOTE:
•The torque converter clutch will not engage, and the
transmission will not shift into the top overdrive gear,
until the transmission fluid and engine coolant are
warm [usually after 1 to 3 miles (1.6 to 4.8 km) of
driving]. Because top gear is disabled, and engine
speed is higher when the torque converter clutch is not
engaged, it may seem as if the transmission is not
shifting properly when cold. This is normal. Using theElectronic Range Select (ERS) feature, when the trans-
mission is sufficiently warm, will demonstrate that the
transmission is able to shift into and out of Overdrive.
•If the vehicle has not been driven for several days, the
first few seconds of operation after shifting the trans-
mission into gear may seem sluggish. This is due to the
fluid partially draining from the torque converter into
the transmission. This condition is normal and will not
cause damage to the transmission. The torque con-
verter will refill within five seconds after starting the
engine.
FOUR-WHEEL DRIVE OPERATION
Quadra-Trac I
Operating Instructions/
Precautions – If Equipped
The Quadra-Trac I is a single-speed (HI range only)
transfer case, which provides convenient full-time four-
wheel drive. No driver interaction is required. The Brake
Traction Control (BTC) System, which combines standard
440 STARTING AND OPERATING

ABS and Traction Control, provides resistance to any
wheel that is slipping to allow additional torque transfer
to wheels with traction.
NOTE:The Quadra-Trac I system is not appropriate
for conditions where 4WD LOW range is recommended.
Refer to “Off-Road Driving Tips” in “Starting and Oper-
ating” for further information.
Quadra-Trac II Operating Instructions/
Precautions – If Equipped
The Quadra-Trac II transfer case is fully automatic in the
normal driving 4WD AUTO mode. The Quadra-Trac II 
transfer case provides three mode positions:
•4WD HI
•NEUTRAL
•4WD LOW
This transfer case is fully automatic in the 4WD HI mode. When additional traction is required, the 4WD LOW
position can be used to lock the front and rear driveshafts
together and force the front and rear wheels to rotate at
the same speed. The 4WD LOW position is intended for
loose, slippery road surfaces only. Driving in the 4WD
LOW position on dry, hard-surfaced roads may cause
increased tire wear and damage to driveline components.
When operating your vehicle in 4WD LOW, the engine
speed is approximately three times that of the 4WD HI
position at a given road speed. Take care not to overspeed
the engine and do not exceed 25 mph (40 km/h).
Proper operation of four-wheel drive vehicles depends
on tires of equal size, type, and circumference on each
wheel. Any difference will adversely affect shifting and
cause damage to the transfer case.
Because four-wheel drive provides improved traction,
there is a tendency to exceed safe turning and stopping
speeds. Do not go faster than road conditions permit.
5
STARTING AND OPERATING 441