2008 JEEP GRAND CHEROKEE clutch

To Activate
Push the ON/OFF button. The CRUISE indicator in the
instrument cluster will illuminate. To turn the system
OFF, push the ON/OFF button a second time. The
CRUISE indicator will turn off. The system should be
turned OFF when not in use.
WARNING!
Leaving the Speed Control system on when not in
use is dangerous. You could accidentally set the
system or cause it to go faster than you want. You
could lose control and have an accident. Always
leave the system OFF when you are not using it.
To Set At A Desired Speed
When the vehicle has reached the desired speed, press
down on the lever and release. Release the accelerator
and the vehicle will operate at the selected speed.
NOTE:The vehicle should be traveling at a steady
speed and on level ground before pressing the SET lever.
To Deactivate
A soft tap on the brake pedal, pulling the speed control
lever towards you ªCANCELº, or normal brake or clutch
pressure while slowing the vehicle will deactivate speed
control without erasing the set speed memory. Pressing
the ON/OFF button or turning off the ignition switch
erases the set speed memory.
136 UNDERSTANDING THE FEATURES OF YOUR VEHICLE

²the transmission selector is in D (Drive);
²the engine coolant has reached normal operating tem-
perature;
²vehicle speed is above approximately 30 mph (48
km/h);
²the ªTOW/HAULº switch has not been activated;
²transmission has reached normal operating tempera-
ture.
NOTE:If the vehicle is started in extremely cold tem-
peratures, the transmission may not shift into Overdrive
and will automatically select the most desirable gear for
operation at this temperature. Normal operation will
resume when the transmission fluid temperature has
risen to a suitable level. Refer also to the Note under
torque converter clutch, later in this section.During cold temperature operation you may notice de-
layed upshifts depending on engine and transmission
temperature. This feature improves the warm up time of
the engine and transmission.
If the transmission temperature gets extremely hot, the
transmission will automatically select the most desirable
gear for operation at this temperature. If the transmission
temperature becomes hot enough, the ªTRANSMISSION
OVER TEMPº message may display and the transmis-
sion may downshift out of Overdrive until the transmis-
sion cools down. After cool down, the transmission will
resume normal operation.
In high ambient temperatures with sustained high engine
speed and load, an upshift followed shortly thereafter by
a downshift may occur. This is a normal part of the
overheat protection strategy when operating in the
ªTow/Haulº mode.
STARTING AND OPERATING 289
5

Transmission Limp Home Mode
Transmission function is monitored for abnormal condi-
tions. If a condition is detected that could result in
transmission damage, the transmission limp home mode
will be engaged. In this mode, the transmission will
remain in the current gear (3.7L engine) or in direct gear
(4.7L and 5.7L engines) until the vehicle is brought to a
stop.
To reset the transmission, use the following procedure:
1. Stop the vehicle.
2. Move the shift lever to the P (Park) position.
3. Turn off the engine, be sure to turn the key to the
LOCK position.
4. Wait approximately 10 seconds, then restart the en-
gine.
5. Move the shift lever to the desired gear range.If the problem is no longer detected, the transmission will
return to normal operation. If the problem persists, P
(Park), R (Reverse), and N (Neutral) will continue to
operate. Only 2nd gear (3.7L engine) or 3rd gear (4.7L
and 5.7L engines) will be available in the D (Drive)
position. Have the transmission checked at your autho-
rized dealer as soon as possible.
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 a calibrated speed at light throttle. It engages at
higher speeds under heavier acceleration. This may re-
sult in a slightly different feeling or response during
normal operation in high gear. When the vehicle speed
drops below a calibrated speed, or during acceleration,
the clutch automatically and smoothly disengages. The
feature is operational in Overdrive and in Drive.
STARTING AND OPERATING 291
5

NOTE:The torque converter clutch will not engage
until the transmission fluid and engine coolant are warm
[usually after 1-3 miles (1.6 - 4.8 km) of driving]. Because
the engine speed is higher when the torque converter
clutch is not engaged, it may seem as if the transmission
is not shifting into Overdrive when cold. This is normal.
Manually shifting (using the ERS shift control) between 4
(direct gear) and 5/D (Overdrive gear) positions will
demonstrate that the transmission is able to shift into and
out of Overdrive.
NOTE:If the vehicle has not been driven in several
days, the first few seconds of operation after shifting the
transmission 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 converter
will refill within five seconds of shifting from Park into
any other gear position.Rocking the Vehicle
If the vehicle becomes stuck in snow, sand, or mud, it can
often be moved by a rocking motion. Move the gear
selector rhythmically between D (Drive) and R (Reverse),
while applying slight pressure to the accelerator.
NOTE:The Electronic Stability Program (ESP) and
Traction Control (if equipped) should be turned OFF
before attempting to rock the vehicle. Refer to ªElectronic
Brake Control Systemº in Section 3 of this manual.
The least amount of accelerator pedal pressure to main-
tain the rocking motion without spinning the wheels or
racing the engine is most effective. Racing the engine or
spinning the wheels, due to the frustration of not freeing
the vehicle, may lead to transmission overheating and
failure. Allow the engine to idle with the transmission
selector in N (Neutral) for at least one minute after every
292 STARTING AND OPERATING

4 LOW to 4 HI
With the vehicle at speeds of 0 to 3 mph (0 to 5 km/h),
key ON or engine running, shift the transmission into N
(Neutral), and raise the transfer case T-handle. The ª4WD
LOW Indicator Lampº in the instrument cluster will flash
and go out when the shift is complete. Release the
T-handle.
NOTE:If shift conditions/interlocks are not met, or a
transfer case motor temperature protection condition
exists, a ªCHECK SHIFT PROCEDURESº message will
flash from the EVIC (Electronic Vehicle Information Cen-
ter). Refer to ªElectronic Vehicle Information Center
(EVIC)º in Section 4 of this manual.NOTE:Shifting into or out of 4WD LOW is possible
with the vehicle completely stopped, however difficulty
may occur due to the mating clutch teeth not being
properly aligned. Several attempts may be required for
clutch teeth alignment and shift completion to occur. The
preferred method is with the vehicle rolling 0 to 3 mph (0
to 5 km/h). If the vehicle is moving faster than 3 mph (5
km/h), the transfer case will not allow the shift.
Neutral (N) Shift Procedure
1. Key ON, engine off.
2. Vehicle stopped, with foot on brake.
3. Place transmission in N (Neutral).
STARTING AND OPERATING 297
5

Cav-
ityCartridge
FuseMini Fuse Description
11 40 Amp
GreenHVAC Blower
12 30 Amp
PinkRear Wiper, Ign R/O
13 40 Amp
GreenRear Window De-
froster (EBL)/Heated
Mirror
14 30 Amp
PinkRear HVAC (If
Equipped)
15 Ð Spare
16 50 Amp
RedASD
17 30 Amp
PinkABS Pump
18 40 Amp
GreenAccessory Delay, SeatsCav-
ityCartridge
FuseMini Fuse Description
19 40 Amp
GreenJB Power
20 Ð Spare
21 20 Amp
YellowFuel Pump
22 20 Amp
YellowTCM, A/C Clutch
23 25 Amp
NaturalPower Inverter
24 20 Amp
YellowRear Heated Seats
25 20 Amp
YellowFinal Drive Control
Module (FDCM)
26 15 Amp
BlueBrake Lamps
430 MAINTAINING YOUR VEHICLE

Tip Start.............................. 280
Tire and Loading Information Placard......... 314
Tire Identification Number (TIN)............. 313
Tire Markings.......................... 310
Tire Safety Information.................... 310
Tires ............................70,318,466
Air Pressure.......................... 319
Alignment and Balance.................. 324
Chains.............................. 325
Changing............................ 372
General Information.................... 318
High Speed.......................... 321
Inflation Pressures..................... 319
Jacking............................. 372
Life of Tires.......................... 323
Load Capacity.....................314,315
Pressure Monitor System (TPMS)........... 326
Pressure Warning Light.................. 191
Quality Grading....................... 466Radial.............................. 321
Replacement......................... 323
Rotation............................. 325
Safety............................70,310
Sizes............................... 311
Spare Tire........................... 373
Spinning............................ 321
Tread Wear Indicators................... 322
Wheel Mounting....................... 377
Tongue Weight/Trailer Weight.............. 357
Torque Converter Clutch.................. 291
Tow Hooks, Emergency................... 381
Tow/Haul Indicator Light................. 193
Towing............................351,382
Disabled Vehicle....................... 382
Guide.............................. 355
Recreational.......................... 364
Weight.............................. 355
Traction Control......................... 139
INDEX 487
10