2020 JEEP WRANGLER fuel

nozzles. Also, the unburned fuel can enter
the crankcase, diluting the oil and causing
rapid wear to the engine.
Stopping the Engine
The following chart should be used as a guide
in determining the amount of engine idle
time required to sufficiently cool down the
turbocharger before shut down, depending
upon the type of driving and the amount of
cargo.Before turning off your turbo diesel engine,
always allow the engine to return to normal idle
speed and run for several seconds. This assures
proper lubrication of the turbocharger. This is
particularly necessary after any period of hard
driving.
Idle the engine a few minutes before routine
shutdown. After full load operation, idle the
engine three to five minutes before shutting itdown. This idle period will allow the lubricat-
ing oil and coolant to carry excess heat away
from the combustion chamber, bearings, in-
ternal components, and turbocharger. This is
especially important for turbocharged,
charge air cooled engines.
TURBOCHARGER "COOL DOWN" CHART
Driving
ConditionsLoad Turbocharger
TemperatureIdle Time (In Minutes)
Before Shut Down
Stop & Go Empty Cool Less than 1
Stop & Go Medium Warm 1
Highway Speeds Medium Warm 2
City Traffic Max. GCWR Warm 3
Highway Speeds Max. GCWR Warm 4
Uphill Grade Max. GCWR Hot 5
STARTING AND OPERATING
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Recommended Vehicle Shift Speeds
To utilize your manual transmission effi-
ciently for both fuel economy and perfor-
mance, it should be upshifted as listed inrecommended shift speed chart. Shift at the
vehicle speeds listed for acceleration. When
heavily loaded or pulling a trailer these rec-
ommended up-shift speeds may not apply.
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
3.6LAccel. 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 significantly less.
Downshifting
Moving from a high gear down to a lower gear
is recommended to preserve brakes when
driving down steep hills. In addition, down-
shifting at the right time provides better ac-
celeration 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 ve-
hicle could skid.
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
CAUTION!
lower gear and releasing the clutch may
result in engine damage.
• When descending a hill, be very careful
to downshift one gear at a time to pre-
vent 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.
• Failure to follow the maximum recom-
mended downshifting speeds may cause
the engine damage and/or damage the
STARTING AND OPERATING
124

tion for further information. The “Sway Bar
Indicator Light” will flash until the stabilizer/
sway bar has been fully disconnected.
NOTE:
The stabilizer/sway bar may be torque locked
due to left and right suspension height differ-
ences. This condition is due to driving sur-
face differences or vehicle loading. In order
for the stabilizer/sway bar to disconnect/
reconnect, the right and left halves of the bar
must be aligned. This alignment may require
that the vehicle be driven onto level ground or
rocked from side to side.
To return to on-road mode, push the SWAY
BAR switch again.
WARNING!
If the stabilizer/sway bar will not return to
on-road mode, the “Sway Bar Indicator
Light” will flash in the instrument cluster
and vehicle stability is greatly reduced. Do
not attempt to drive the vehicle over
18 mph (29 km/h). Driving faster than
18 mph (29 km/ h) may cause loss of
control of the vehicle, which could result
WARNING!
in serious injury. Contact your local autho-
rized dealer for assistance.
STOP/START SYSTEM —
DIESEL MODELS WITH
MANUAL TRANSMISSION
ONLY
The Stop/Start function is developed to save
fuel and reduce emissions. The system will
stop the engine automatically during a ve-
hicle stop if the required conditions are met.
Pressing the clutch pedal will automatically
restart the vehicle.
Automatic Mode
The Stop/Start feature is en-
abled after every normal cus-
tomer engine start. It will remain
in STOP/START NOT READY un-
til you drive forward with a ve-
hicle speed greater than 3 mph (5 km/h). Atthat time, the system will go into STOP/
START READY and if all other conditions are
met, can go into an STOP/START AUTO STOP
ACTIVE mode.
To Activate The STOP/START AUTO STOP ACTIVE
Mode, The Following Must Occur:
• The system must be in STOP/START
READY state. A STOP/START READY mes-
sage will be displayed in the instrument
cluster. Refer to “Instrument Cluster Dis-
play” in “Getting To Know Your Instrument
Panel” for further information.
• Vehicle speed must be less 3 mph (5 km/h).
• The gear selector must be in the NEUTRAL
position and the clutch pedal must be fully
released
The engine will shut down,the tachometer will
fall to the Stop/Start position,the STOP/START
AUTO STOP ACTIVE message will appear,
and the heater/air conditioning (HVAC) air
flow will be reduced.
STARTING AND OPERATING
134

Using Speed Control On Hills
The transmission may downshift on hills to
maintain the vehicle set speed.
NOTE:
The Speed Control system maintains speed
up and down hills. A slight speed change on
moderate hills is normal.
On steep hills, a greater speed loss or gain
may occur so it may be preferable to drive
without Speed Control.
WARNING!
Speed Control can be dangerous where the
system cannot maintain a constant speed.
Your vehicle could go too fast for the con-
ditions, and you could lose control and
have an accident. Do not use Speed Con-
trol in heavy traffic or on roads that are
winding, icy, snow-covered or slippery.
REFUELING THE VEHICLE
Fuel Filler Cap
The fuel filler cap is located on the driver's
side of the vehicle. If the fuel filler cap is lost
or damaged, be sure the replacement cap is
the correct one for this vehicle.
WARNING!
• Never have any smoking materials lit in
or near the vehicle when the gas cap is
removed or the tank is being filled.
• Never add fuel when the engine is run-
ning. This is in violation of most state
fire regulations and may cause the MIL
to turn on.
• A fire may result if gasoline is pumped
into a portable container that is inside of
a vehicle. You could be burned. Always
place gas containers on the ground while
filling.
CAUTION!
• Damage to the fuel system or emission
control system could result from using
an improper fuel filler cap. A poorly
fitting cap could let impurities into the
fuel system. Also, a poorly fitting after-
market cap can cause the “Malfunction
Indicator Light (MIL)” to illuminate, due
to fuel vapors escaping from the system.
Fuel Filler Cap
139

CAUTION!
• To avoid fuel spillage and overfilling, do
not “top off” the fuel tank after filling.
NOTE:
• When the fuel nozzle “clicks” or shuts off,
the fuel tank is full.
• Tighten the fuel filler cap about 1/4 turn
until you hear one click. This is an indica-
tion that the cap is properly tightened.
• If the fuel filler cap is not tightened prop-
erly, the MIL will come on. Be sure the cap
is tightened every time the vehicle is
refueled.
Loose Fuel Filler Cap Message
After fuel has been added, the vehicle diag-
nostic system can determine if the fuel filler
cap is possibly loose, improperly installed, or
damaged. If the system detects a malfunc-
tion, the “gASCAP” message will display in
the odometer display. Tighten the gas cap
until a "clicking" sound is heard. This is an
indication that the gas cap is properly tight-
ened. Push the odometer reset button to turn
the message off. If the problem persists, the
message will appear the next time the vehicleis started. This might indicate a damaged
cap. If the problem is detected twice in a row,
the system will turn on the MIL. Resolving
the problem will turn the MIL off.
TRAILER TOWING
Trailer Towing Weights (Maximum Trailer
Weight Ratings)
The following chart provides the maximum
trailer weight ratings towable for your given
drivetrain.
Body Style Engine Transmission Axle Ratio Max. GTW (Gross Trailer Wt.) Max. Tongue Wt. (See Note)
2–Door3.6L EngineManual 3.21/3.73 2,205 lbs (1,000 kg) 110 lbs (50 kg)
Automatic 3.21/3.73/4.10 2,205 lbs (1,000 kg) 110 lbs (50 kg)
2.8L Diesel En-
gineManual/
Automatic3.21 2,205 lbs (1,000 kg) 110 lbs (50 kg)
3.73 3,307 lbs (1,500 kg) 330 lbs (150 kg)
STARTING AND OPERATING
140

Cavity Cartridge Fuse Mini Fuse Description
J8 – – –
J9 40 Amp Green – PZEV Sec Motor/Flex Fuel – If Equipped
J10 30 Amp Pink – Headlamp Wash Relay/Manifold Tuning Valve
J11 30 Amp Pink – Sway Bar
J12 – – –
J13 60 Amp Yellow – Ignition Off Draw (IOD) – Main
J14 40 Amp Green – Rear Defroster
J15 40 Amp Green – Front Blower
J17 40 Amp Green – Starter Solenoid
J18 20 Amp Blue – Powertrain Control Module (PCM) Trans Range
J19 60 Amp Yellow – Radiator Fan
J20 30 Amp Pink – Front Wiper LO/HI
J21 20 Amp Blue – Front/Rear Washer
J22 – – Spare
M1 – 15 Amp Blue Center High-Mounted Stop Light (CHMSL)/Switch Stop
Lamp Feed
M2 – 20 Amp Yellow Relay Trailer Lighting (Stop lamp)
M3 – 20 Amp Yellow Front/Rear Axle Locker Relay
M4 – 2 Amp Grey Clock Spring
M5 – 25 Amp Clear Power Inverter – If Equipped
M6 – 20 Amp Yellow Power Outlet #1/Rain Sensor
M7 – 20 Amp Yellow Power Outlet #2 (BATT/ACC SELECT)
M8 – 20 Amp Yellow Front Heated Seat
151

Cavity Cartridge Fuse Mini Fuse Description
M9 – 20 Amp Yellow Rear Heated Seat – If Equipped
M10 – 15 Amp Blue Ignition Off Draw – Vehicle Entertainment System, Sat-
ellite Digital Audio Receiver (SDARS), DVD, Hands-Free
Module, RADIO, Antenna, Universal Garage Door
Opener, Vanity Lamp
M11 – 10 Amp Red (Ignition Off Draw) Climate Control System,
Underhood Lamp
M12 – 30 Amp Green Amplifier
M13 – 20 Amp Yellow Ignition Off Draw – Cabin Compartment Node, Wireless
Control Module, SIREN, Multifunction Control Switch
M14 – 20 Amp Yellow Trailer Tow (Export Only)
M15 – 20 Amp Yellow Climate Control System, Rear View Mirror, Cabin Com-
partment Node, Transfer Case Switch, Multi-Function
Control Switch, Tire Pressure Monitor, Glow Plug Module
– Export Diesel Only
M16 – 10 Amp Red Airbag Module
M17 – 15 Amp Blue Left Tail/License/Park Lamp
M18 – 15 Amp Blue Right Tail/Park/Run Lamp
M19 – 25 Amp Clear Auto Shut Down (ASD #1 and #2)
M20 – 15 Amp Blue Cabin Compartment Node Interior Light, Switch Bank
M21 – 20 Amp Yellow Auto Shut Down (ASD #3)
M22 – 10 Amp Red Right Horn (HI/LOW)
M23 – 10 Amp Red Left Horn (HI/LOW)
M24 – 25 Amp Clear Rear Wiper
M25 – 20 Amp Yellow Fuel Pump, Diesel Lift Pump – Export Only
IN CASE OF EMERGENCY
152

Cavity Cartridge Fuse Mini Fuse Description
M26 – 10 Amp Red Power Window Switch, Driver Window Switch
M27 – 10 Amp Red Ignition Switch Feed, Wireless Module
M28 – 10 Amp Red Powertrain Control Module
M29 – 10 Amp Red Powertrain
M30 – 15 Amp Blue Wiper Motor Frt, J1962 Diagnostic Feed
M31 – 20 Amp Yellow Backup Lamps
M32 – 10 Amp Red Airbag Controller, TT EUROPE
M33 – 10 Amp Red Powertrain Controller
M34 – 10 Amp Red Park Assist, Climate Control System,
Headlamp Wash, Compass
M35 – 10 Amp Red Heated Mirrors
M36 – 20 Amp Yellow Power Outlet
M37 – 10 Amp Red Anti-Lock Brake System, Electronic Stability Control,
Stop Lamp Switch, Fuel Pump Relay
M38 – 25 Amp Clear Lock/Unlock Motors
CAUTION!
• When installing the Integrated Power
Module cover, it is important to ensure
the cover is properly positioned and fully
latched. Failure to do so may allow water
to get into the Integrated Power Module,
CAUTION!
and possibly result in an electrical sys-
tem failure.
• When replacing a blown fuse, it is impor-
tant to use only a fuse having the correct
amperage rating. The use of a fuse with a
CAUTION!
rating other than indicated may result in
a dangerous electrical system overload.
If a properly rated fuse continues to
blow, it indicates a problem in the circuit
that must be corrected.
153