engine JEEP WRANGLER 2016 JK / 3.G Service Manual

•Extended use of recirculation may cause the windows
to fog. If the interior of the windows begins to fog,
push the Recirculation button to return to outside air.
Some temp/humidity conditions will cause captured
interior air to condense on windows and hamper
visibility. For this reason, the system will not allow
recirculation to be selected while in defrost mode.
Attempting to use recirculation while in this mode will
cause the LED in the control button to blink and then
turn off.
• Most of the time, when in Automatic Operation, you
can temporarily put the system into Recirculation
mode by pushing the Recirculation button. However,
under certain conditions, while in Automatic mode,
the system is blowing air out the defrost vents. When
these conditions are present, and the Recirculation
button is pushed, the indicator will flash and then turn
off. This tells you that you are unable to go into
Recirculation mode at this time. If you would like the system to go into Recirculation mode, you must first
move the Mode knob to Panel, Bi-Level, Floor, or Mix
and then push the Recirculation button. This feature
reduces the possibility of window fogging.
Operating Tips
NOTE:
Refer to the chart at the end of this section for
suggested control settings for various weather condi-
tions.
Summer Operation
The engine cooling system must be protected with a
high-quality antifreeze coolant to provide proper corro-
sion protection and to protect against engine overheating.
A solution of 50% OAT (Organic Additive Technology)
coolant that meets the requirements of FCA Material
Standard MS.90032 and 50% water is recommended.
Refer to “Maintenance Procedures” in “Maintaining Your
Vehicle” for proper coolant selection.
4
UNDERSTANDING YOUR INSTRUMENT PANEL 425

STARTING AND OPERATING
CONTENTS
STARTING PROCEDURES ................434
▫ Manual Transmission — If Equipped .......434
▫ Automatic Transmission — If Equipped .....434
▫ Normal Starting ...................... .435
▫ Extreme Cold Weather
(Below –22°F Or 30°C) ................435
▫ If Engine Fails To Start .................435
▫ After Starting ....................... .437
 ENGINE BLOCK HEATER — IF EQUIPPED . . .437
 MANUAL TRANSMISSION — IF EQUIPPED . .438 ▫
Shifting ............................ .439
▫ Downshifting ....................... .440
▫ Reverse Shifting ..................... .442
 AUTOMATIC TRANSMISSION — IF
EQUIPPED .......................... .442
▫ Key Ignition Park Interlock ...............444
▫ Brake/Transmission Shift Interlock System . . .444
▫ Five-Speed Automatic Transmission — If
Equipped .......................... .445
▫ Gear Ranges ........................ .446
5

▫Tire Spinning ....................... .517
▫ Tread Wear Indicators ..................518
▫ Life Of Tire ........................ .519
▫ Replacement Tires .....................519
 TIRE CHAINS (TRACTION DEVICES) .......521
 TIRE ROTATION RECOMMENDATIONS .....522
 TIRE PRESSURE MONITOR SYSTEM (TPMS) . .523
▫ Base TPM System .....................526
▫ Premium System — If Equipped ...........529
▫ General Information ....................534
 FUEL REQUIREMENTS ..................534
▫ 3.6L Engine ......................... .534
▫ Reformulated Gasoline .................535 ▫
Gasoline/Oxygenate Blends ..............535
▫ E-85 Usage In Non-Flex Fuel Vehicles .......536
▫ MMT In Gasoline .....................536
▫ Materials Added To Fuel ................537
▫ Fuel System Cautions ...................537
▫ Carbon Monoxide Warnings .............538
 ADDING FUEL ....................... .539
▫ Fuel Filler Cap ...................... .539
▫ Loose Fuel Filler Cap Message ............541
 VEHICLE LOADING ....................541
▫ Certification Label ....................541
 TRAILER TOWING .....................544
▫ Common Towing Definitions .............544
432 STARTING AND OPERATING

Normal Starting
NOTE:Normal starting of either a cold or a warm engine
is obtained without pumping or pressing the accelerator
pedal.
Cycle the ignition switch to the START position and
release when the engine starts. If the engine fails to start
within 10 seconds, cycle the ignition switch to the
LOCK/OFF position, wait 10 to 15 seconds, then repeat
the “Normal Starting” procedure.
Tip Start Feature — Automatic Transmission Only
Turn the ignition switch to the START position and
release it as soon as the starter engages. The starter motor
will continue to run, but will automatically disengage
itself when the engine is running. If the engine fails to start, the starter will disengage automatically in 10 sec-
onds. If this occurs, turn the ignition switch to the LOCK
position, wait 10 to 15 seconds, then repeat the “Normal
Starting” procedure.
Extreme Cold Weather (Below –22°F Or 30°C)
To ensure reliable starting at these temperatures, use of
an externally powered electric engine block heater (avail-
able from your authorized dealer) is recommended.
If Engine Fails To Start
WARNING!
•
Never pour fuel or other flammable liquids into
the throttle body air inlet opening in an attempt to
start the vehicle. This could result in a flash fire
causing serious personal injury.
(Continued)
5
STARTING AND OPERATING 435

WARNING!(Continued)
•Do not attempt to push or tow your vehicle to get it
started. Vehicles equipped with an automatic trans-
mission cannot be started this way. Unburned fuel
could enter the catalytic converter and, once the
engine has started, ignite and damage the converter
and vehicle.
• If the vehicle has a discharged battery, booster
cables may be used to obtain a start from a booster
battery or the battery in another vehicle. This type
of start can be dangerous if done improperly. Refer
to “Jump-Starting” in “What To Do In Emergen-
cies” for further information.
Without Tip Start — Manual Transmission Only
If the engine fails to start after you have followed the
“Normal Starting” or “Extreme Cold Weather” proce-
dures, it may be flooded. Push the accelerator pedal all
the way to the floor and hold it there while cranking the engine. This should clear any excess fuel in case the
engine is flooded.
CAUTION!
To prevent damage to the starter, do not crank the
engine for more than 15 seconds at a time. Wait 10 to
15 seconds before trying again.
If the engine has been flooded, it may start to run, but not
have enough power to continue running when the key is
released. If this occurs, continue cranking with the accel-
erator pedal pushed all the way to the floor. Release the
accelerator pedal and the key once the engine is running
smoothly.
If the engine shows no sign of starting after two 15-
second periods of cranking with the accelerator pedal
held to the floor, repeat the “Normal Starting” or “Ex-
treme Cold Weather” procedures.
436 STARTING AND OPERATING

With Tip Start — Automatic Transmission Only
If the engine fails to start after you have followed the
“Normal Starting” or “Extreme Cold Weather” proce-
dures, it may be flooded. To clear any excess fuel, push
the accelerator pedal all the way to the floor and hold it.
Then, turn the ignition switch to the START position and
release it as soon as the starter engages. The starter motor
will disengage automatically in 10 seconds. Once this
occurs, release the accelerator pedal, turn the ignition
switch to the LOCK position, wait 10 to 15 seconds, then
repeat the “Normal Starting” procedure.
CAUTION!
To prevent damage to the starter, wait 10 to 15
seconds before trying again.
After Starting
The idle speed is controlled automatically and it will
decrease as the engine warms up.
ENGINE BLOCK HEATER — IF EQUIPPED
The engine block heater warms the engine, and permits
quicker starts in cold weather. Connect the cord to a
standard 110-115 Volt AC electrical outlet with a
grounded, three-wire extension cord.
The engine block heater must be plugged in at least one
hour to have an adequate warming effect on the engine.
The engine block heater cord is found under the hood
bundled in front of the battery tray.
5
STARTING AND OPERATING 437

WARNING!
Remember to disconnect the engine block heater
cord before driving. Damage to the 110-115 Volt AC
electrical cord could cause electrocution.
MANUAL TRANSMISSION — IF EQUIPPED
WARNING!
You or others could be injured if you leave the
vehicle unattended without having the parking
brake fully applied. The parking brake should al-
ways be applied when the driver is not in the vehicle,
especially on an incline.
CAUTION!
Never drive with your foot resting on the clutch
pedal, or attempt to hold the vehicle on a hill with the
clutch pedal partially engaged, as this will cause
abnormal wear on the clutch.
NOTE: During cold weather, you may experience in-
creased effort in shifting until the transmission fluid
warms up. This is normal.
438 STARTING AND OPERATING

Manual Transmission Shift Speeds in MPH (KM/H)
Engine Speeds 1 to 2 2 to 3 3 to 4 4 to 5 5 to 6 3.6L Accel. 15 (24) 24 (39) 34 (55) 47 (76) 56 (90)
Cruise 10 (16) 19 (31) 27 (43) 37 (60) 41 (66)
NOTE: Vehicle speeds shown in the chart above are for
2H and 4H only, vehicle speeds in 4L would be signifi-
cantly less.
Downshifting
Moving from a high gear down to a lower gear is
recommended to preserve brakes when driving down
steep hills. In addition, downshifting at the right time
provides better acceleration when you desire to resume
speed. Downshift progressively. Do not skip gears to
avoid overspeeding the engine and clutch.
WARNING!
Do not downshift for additional engine braking on a
slippery surface. The drive wheels could lose their
grip, and the vehicle could skid.
440 STARTING AND OPERATING

CAUTION!
•Skipping gears and downshifting into lower gears
at higher vehicle speeds can damage the engine
and clutch systems, Any attempt to shift into lower
gear with clutch pedal depressed may result dam-
age to the clutch system. Shifting into lower gear
and releasing the clutch may result in engine
damage.
• When descending a hill, be very careful to down-
shift one gear at a time to prevent overspeeding the
engine which can cause engine damage, and/or
clutch damage, even if the clutch pedal is pressed.
If transfer case is in low range the vehicle speeds to
cause engine and clutch damage are significantly
lower.
(Continued)
CAUTION! (Continued)
•Failure to follow the maximum recommended
downshifting speeds may cause the engine damage
and/or damage the clutch, even if the clutch pedal
is pressed.
• Descending a hill in low range with clutch pedal
depressed could result in clutch damage.
Maximum Recommended Downshift Speeds
CAUTION!
Failure to follow the maximum recommended down-
shifting speeds may cause the engine to overspeed
and/or damage the clutch disc, even if the clutch
pedal is pressed.
5
STARTING AND OPERATING 441

Manual Transmission Downshift Speeds in MPH (KM/H)
Gear Selection 6 to 5 5 to 4 4 to 3 3 to 2 2 to 1
Maximum Speed 80 (129) 70 (113) 50 (81) 30 (48) 15 (24)
NOTE: Vehicle speeds shown in the chart above are for
2H and 4H only, vehicle speeds in 4L would be signifi-
cantly less.
Reverse Shifting
To shift into REVERSE, bring the vehicle to a complete
stop. Press the clutch and pause briefly to allow the gear
train to stop rotating. Beginning from the NEUTRAL
position, move the shift lever in one quick, smooth
motion straight across and into the REVERSE area (the
driver will feel a firm “click” as the shifter passes the
“knock-over”). Complete the shift by pulling the shift
lever into REVERSE.
The “knock-over” provides a resistance to the driver
from accidentally entering the REVERSE shift area and warns the driver that they are about to shift the trans-
mission into REVERSE. Due to this feature, a slow shift to
REVERSE can be perceived as a high shift effort.
AUTOMATIC TRANSMISSION — IF EQUIPPED
CAUTION!
Damage to the transmission may occur if the follow-
ing precautions are not observed:
•
Shift into or out of PARK or REVERSE only after
the vehicle has come to a complete stop.
•
Do not shift between PARK, REVERSE, NEUTRAL,
or DRIVE when the engine is above idle speed.
(Continued)
442 STARTING AND OPERATING