brake JEEP WRANGLER 2023 Manual Online

316SERVICING AND MAINTENANCE
3.0L DIESEL ENGINE
1 — Battery 6 — Power Distribution Center (Fuses)
2 — Engine Oil Fill 7 — Power Steering Reservoir Cap
3 — Engine Coolant Pressure Reservoir Cap 8 — Engine Oil Dipstick
4 — Brake Fluid Reservoir Cap 9 — Engine Air Cleaner Filter
5 — Washer Fluid Reservoir Cap

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SERVICING AND MAINTENANCE323
10. Lubricate o-ring on the cap with clean engine oil.
11. Install the new fuel filter cartridge onto the cap.
12. Insert the cap and filter into the housing with
clockwise rotation, use a socket to tighten.
13. Push the ignition switch twice without your foot on the brake to place vehicle in RUN position. This will
activate the in tank fuel pump for approximately 30
seconds. Repeat this process twice to prime the fuel
system. Start the engine using the Normal Starting
procedure. After engine start, verify the fuel filter cap
does not leak.
PRIMING IF THE ENGINE HAS RUN OUT
O
F FUEL — DIESEL ENGINE

1. Add a substantial amount of fuel to the tank, approx -
imately 2 to 5 gal (8L to 19L).

2. Push ignition switch twice without your foot on brake to put vehicle in RUN position. This will activate the in
tank fuel pump for approximately 30 seconds.
Repeat this process twice to prime the fuel system.
3. Start the engine using the Normal Starting procedure
Úpage 130.
NOTE:The engine may run rough until the air is forced from all
the fuel lines.
NOTE:
 Use of biodiesel mixture in excess of 20% can nega -
tively impact the fuel filter's ability to separate water
from the fuel, resulting in high pressure fuel system
corrosion or damage.
 In addition, commercially available fuel additives are
not necessary for the proper operation of your diesel
engine.
 For extreme cold conditions, "Mopar® Premium Diesel
Fuel Treatment" is recommended to assist with cold
starting.
INTERVENTION REGENERATION
S
TRATEGY — MESSAGE PROCESS FLOW
This engine meets all required diesel engine emissions
standards. To achieve these emissions standards, your
vehicle is equipped with a state-of-the-art engine and
exhaust system. These systems are seamlessly integrated
into your vehicle and managed by the Powertrain Control
Module (PCM). The PCM manages engine combustion to
allow the exhaust system’s catalyst to trap and burn
Particulate Matter (PM) pollutants, with no input or
interaction on your part.
Additionally, your vehicle has the ability to alert you to
additional maintenance required on your vehicle or
engine.
Refer to Instrument Cluster Display for further information
Úpage 108.
DIESEL EXHAUST FLUID
Diesel Exhaust Fluid (DEF) sometimes known simply by
the name of its active component, UREA—is a key
component of Selective Catalytic Reduction (SCR)
systems, which help diesel vehicles meet stringent
emission regulations. DEF is a liquid reducing agent that
WARNING!
Do not open the high pressure fuel system with the
engine running. Engine operation causes high fuel
pressure. High pressure fuel spray can cause serious
injury or death.
CAUTION!
The starter motor will engage for approximately
30 seconds at a time. Allow two minutes between
cranking intervals.
WARNING!
Do not use alcohol or gasoline as a fuel blending agent.
They can be unstable under certain conditions and be
hazardous or explosive when mixed with diesel fuel.
CAUTION!
Due to lack of lubricants in alcohol or gasoline, the use
of these fuels can cause damage to the fuel system.WARNING!
A hot exhaust system can start a fire if you park over
materials that can burn. Such materials might be grass
or leaves coming into contact with your exhaust system.
Do not park or operate your vehicle in areas where your
exhaust system can contact anything that can burn.
8

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SERVICING AND MAINTENANCE331
(Continued)
With the engine OFF and cold, the level of the engine
coolant should be within the OK range between the ADD
and FULL range on the dipstick.

1. Remove the cap with level dipstick from the engine
coolant bottle.

2. Clean off the coolant from the dipstick.
3. Rest the cap on the opening of the coolant bottle without tightening the cap.
4. Remove the cap with dipstick and check the coolant level on the dipstick.
The radiator normally remains completely full, so there is
no need to remove the radiator/coolant pressure cap
unless checking for engine coolant freeze point or
replacing coolant. Advise your service attendant of this. As
long as the engine operating temperature is satisfactory,
the coolant bottle need only be checked once a month.
When additional engine coolant is needed to maintain the
proper level, only OAT coolant that meets the
requirements of the manufacturer Material Standard
MS.90032 should be added to the coolant bottle. Do not
overfill.
Cooling System Notes
NOTE:When the vehicle is stopped after a few miles/kilometers
of operation, you may observe vapor coming from the front
of the engine compartment. This is normally a result of
moisture from rain, snow, or high humidity accumulating
on the radiator and being vaporized when the thermostat
opens, allowing hot engine coolant (antifreeze) to enter
the radiator. If an examination of your engine compartment shows no
evidence of radiator or hose leaks, the vehicle may be
safely driven. The vapor will soon dissipate.

Do not overfill the coolant expansion bottle.
 Check the coolant freeze point in the radiator and in
the coolant expansion bottle. If engine coolant needs
to be added, the contents of the coolant expansion
bottle must also be protected against freezing.
 If frequent engine coolant additions are required, the
cooling system should be pressure tested for leaks.
 Maintain engine coolant concentration at a minimum
of 50% OAT coolant (conforming to MS.90032) and
distilled water for proper corrosion protection of your
engine which contains aluminum components.
 Make sure that the coolant expansion bottle overflow
hoses are not kinked or obstructed.
 Keep the front of the radiator clean. If your vehicle is
equipped with air conditioning, keep the front of the
condenser clean.
 Do not change the thermostat for Summer or Winter
operation. If replacement is ever necessary, install
ONLY the correct type thermostat. Other designs may
result in unsatisfactory engine cooling performance,
poor gas mileage, and increased emissions.BRAKE SYSTEM
In order to ensure brake system performance, all brake
system components should be inspected periodically. For
the proper maintenance intervals
Úpage 307.
Fluid Level Check — Brake Master Cylinder
The fluid level of the master cylinder should be checked
whenever the vehicle is serviced, or immediately if the
Brake System Warning Light is on. If necessary, add fluid
to bring level within the designated marks on the side of
the reservoir of the brake master cylinder. Be sure to clean
the top of the master cylinder area before removing cap.
With disc brakes, fluid level can be expected to fall as the
brake pads wear. Brake fluid level should be checked
when pads are replaced. If the brake fluid is abnormally
low, check the system for leaks
Úpage 376.
WARNING!
Riding the brakes can lead to brake failure and possibly
a collision. Driving with your foot resting or riding on the
brake pedal can result in abnormally high brake
temperatures, excessive lining wear, and possible brake
damage. You would not have your full braking capacity
in an emergency.
WARNING!
Use only the manufacturer recommended brake fluid Úpage 376. Using the wrong type of brake fluid can
severely damage your brake system and/or impair its
performance. The proper type of brake fluid for your
vehicle is also identified on the original factory
installed hydraulic master cylinder reservoir.
8

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332SERVICING AND MAINTENANCE
FRONT/REAR AXLE FLUID
For normal service, periodic fluid level checks are not
required. When the vehicle is serviced for other reasons
the exterior surfaces of the axle assembly should be
inspected. If gear oil leakage is suspected inspect the fluid
level.
Fluid Level Check
Lubricant should be approximately 1/8 inch (3 mm) below
the bottom edge of the oil fill hole.
NOTE:Make sure that the vehicle is level and supported by the
axles.
Adding Fluid
Add lubricant only at the fill hole and only to the level
specified above.
Selection Of Lubricant
Use only manufacturer recommended fluid Úpage 376.
TRANSFER CASE
Fluid Level Check
The fluid level should be to the bottom edge of the fill hole
when the vehicle is in a level position.

Transfer Case

Drain And Refill
For the proper maintenance intervals Úpage 307.
Selection Of Lubricant
Use only the manufacturer recommended fluid Úpage 376.
MANUAL TRANSMISSION — IF EQUIPPED
Fluid Level Check
Check the fluid level by removing the fill plug. The fluid
level should be between the bottom of the fill hole and a
point not more than 3/16 of an inch (4.76 mm) below the
bottom of the hole.
Add fluid, if necessary, to maintain the proper level.
Frequency Of Fluid Change
Under normal operating conditions, the fluid installed at
the factory will give satisfactory lubrication for the life of
the vehicle. If the fluid becomes contaminated with water,
it should be changed immediately. Otherwise, change the
fluid as recommended in the Maintenance Plan. Refer to
the Maintenance Plan for the proper maintenance
intervals
Úpage 307.
Selection Of Lubricant
Use only the manufacturer recommended manual
transmission fluid Úpage 376.

To avoid contamination from foreign matter or mois -
ture, use only new brake fluid or fluid that has been
in a tightly closed container. Keep the master
cylinder reservoir cap secured at all times. Brake
fluid in an open container absorbs moisture from the
air resulting in a lower boiling point. This may cause
it to boil unexpectedly during hard or prolonged
braking, resulting in sudden brake failure. This could
result in a collision.
 Overfilling the brake fluid reservoir can result in
spilling brake fluid on hot engine parts, causing the
brake fluid to catch fire. Brake fluid can also damage
painted and vinyl surfaces, care should be taken to
avoid its contact with these surfaces.
 Do not allow petroleum-based fluid to contaminate
the brake fluid. Brake seal components could be
damaged, causing partial or complete brake failure.
This could result in a collision.
WARNING!
1 — Fill hole
2 — Drain hole

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338SERVICING AND MAINTENANCE
F25 –10 Amp RedModule Shift By Wire (MOD_SBW)
F26 40 Amp Green –Central Body Controller (CBC) 2-EXTERIOR LIGHTS #1
F27 30 Amp Pink –Front Wipers
F28 40 Amp Green –Central Body Controller (CBC) 3-POWER LOCKS
F29 40 Amp Green –Central Body Controller (CBC) 4-EXTERIOR LIGHTS #2
F30 ––Spare *
F31 –10 Amp RedDIAGNOSTIC PORT
F32 –10 Amp RedHeating Ventilation Air Conditioning Mod (HVAC CTRL MOD)/Steering
Column Lock (SCL)/Occupant Classification Module (OCM)/Driver
Presence Detection Module (DPDM)
F33 –10 Amp RedParkTronics System (PTS)/Infrared Camera Module (IRCM)/Airbag
Disable Lamps (AIRBAG DISABLE LMPS)
F34 –10 Amp RedElectronic Stability Control (ESC)/Electric Hydraulic Power Steering
(EHPS)/Smart Bar Control Module (SBCM) WAKE UP
F35 30 Amp Pink –BRAKE VAC PMP*
F36 30 Amp Pink –TRAILER TOW ELEC BRK MOD*
F37 30 Amp Pink –TRAILER TOW CONN 7W*
F38 20 Amp Blue –Engine Control Module (ECM)
F39 –15 Amp BlueMGU Coolant Pump (3.6)*
F40 –15 Amp BlueDriveTrain Control Module (DTCM)/Axle Lock (AXLE LOC) FT_RR
F41 –15 Amp BlueInstrument Cluster (IC)/Security GateWay (SGW) WAKE UP
F42 –10 Amp RedPCR Ctrl Feed (ESS) *
F43 –20 Amp Yellow PWR OUTLET (CARGO) BATT
F44 –10 Amp RedInfraRed Camera (IRCAM) HEATERS
F45 –20 Amp Yellow PWR OUTLET (CARGO) IGN
CavityCartridge Fuse Micro Fuse Description

* If Equipped

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340SERVICING AND MAINTENANCE
F69 –5 Amp TanMotor Generator Unit MGU Belt Starter Generator (BSG)*
F70 –25 Amp ClearINJ/IGN COIL (GAS)/GLO PLUG MOD (DSL)
F71 ––Spare *
F72 –10 Amp RedHD ELEC ACC PKG*
F73 20 Amp Blue –PWR TOP LT
F74 20 Amp Blue –PWR TOP RT
F75 –10 Amp RedPower Pack Unit - Battery Pack Control Module & Auxiliary Power
Module (PPU-BPCM & APM) Belt Starter Generator (BSG)*
F76 –20 Amp Yellow ECM (GAS)/PCM (DSL)
F77 –10 Amp RedHEATED MIRRORS
F78 –10 Amp RedINTRUSION MOD/SIREN/INTRUSION SENSORS
F79 –20 Amp Yellow SMART BAR CTRL MOD
F80 –15 Amp Blue
Powertrain Control Module (PCM) / SOL 1,2 BLOCK SHIFT *
10 Amp Red Vapor Blocking Valve (BSG) *
F81 30 Amp Pink –Rear Defrost (EBL)
F82 30 Amp Pink –FUEL HTR*
F83 60 Amp Yellow –GLOW PLUG*
F84 30 Amp Pink –UREA HTR CTRL UNIT*
F85 –10 Amp RedPM SENSOR*
F86 30 Amp Pink –BRAKE VAC PMP 2*
F87 –10 Amp RedSUPPLY/PURGING PMP*
F88 20 Amp Blue –NOx SENSOR #1/ #2*
F89 –10 Amp RedSteering Column Control Module (SCCM)/ Cruise Control (CRUISE
CTL)/Digital TV (DTV) / EVIC / Airbag Disable Lamp
Cavity
Cartridge Fuse Micro Fuse Description

* If Equipped

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356SERVICING AND MAINTENANCE
spare tire descriptions begin with the letter “T” or “S”
preceding the size designation. Example: T145/80D18
103M.
T, S = Temporary Spare Tire
Since this tire has limited tread life, the original equipment
tire should be repaired (or replaced) and reinstalled on
your vehicle at the first opportunity.
Do not install a wheel cover or attempt to mount a
conventional tire on the compact spare wheel, since the
wheel is designed specifically for the compact spare tire.
Do not install more than one compact spare tire and wheel
on the vehicle at any given time.
Full Size Spare — If Equipped
The full size spare is for temporary emergency use only.
This tire may look like the originally equipped tire on the
front or rear axle of your vehicle, but it is not. This spare
tire may have limited tread life. When the tread is worn to
the tread wear indicators, the temporary use full size
spare tire needs to be replaced. Since it is not the same as your original equipment tire, replace (or repair) the original
equipment tire and reinstall on the vehicle at the first
opportunity.
Limited Use Spare — If Equipped
The limited use spare tire is for temporary emergency use
only. This tire is identified by a label located on the limited
use spare wheel. This label contains the driving limitations
for this spare. This tire may look like the original equipped
tire on the front or rear axle of your vehicle, but it is not.
Installation of this limited use spare tire affects vehicle
handling. Since it is not the same as your original
equipment tire, replace (or repair) the original equipment
tire and reinstall on the vehicle at the first opportunity.
WHEEL AND WHEEL TRIM CARE
All wheels and wheel trim, especially aluminum and
chrome plated wheels, should be cleaned regularly using
mild (neutral Ph) soap and water to maintain their luster
and to prevent corrosion. Wash wheels with the same soap solution recommended for the body of the vehicle
and remember to always wash when the surfaces are not
hot to the touch.
Your wheels are susceptible to deterioration caused by
salt, sodium chloride, magnesium chloride, calcium
chloride, etc., and other road chemicals used to melt ice
or control dust on dirt roads. Use a soft cloth or sponge
and mild soap to wipe away promptly. Do not use harsh
chemicals or a stiff brush. They can damage the wheel’s
protective coating that helps keep them from corroding
and tarnishing.
When cleaning extremely dirty wheels including excessive
brake dust, care must be taken in the selection of tire and
wheel cleaning chemicals and equipment to prevent
damage to the wheels. Mopar® Wheel Treatment or
Mopar® Chrome Cleaner or their equivalent is
recommended or select a non-abrasive, non-acidic
cleaner for aluminum or chrome wheels.
WARNING!
Compact and collapsible spares are for temporary
emergency use only. With these spares, do not drive
more than 50 mph (80 km/h). Temporary use spares
have limited tread life. When the tread is worn to the
tread wear indicators, the temporary use spare tire
needs to be replaced. Be sure to follow the warnings,
which apply to your spare. Failure to do so could result
in spare tire failure and loss of vehicle control.WARNING!
Limited use spares are for emergency use only.
Installation of this limited use spare tire affects vehicle
handling. With this tire, do not drive more than the
speed listed on the limited use spare wheel. Keep
inflated to the cold tire inflation pressures listed on your
Tire And Loading Information Placard located on the
driver’s side B-pillar or the rear edge of the driver’s side
door. Replace (or repair) the original equipment tire at
the first opportunity and reinstall it on your vehicle.
Failure to do so could result in loss of vehicle control.
CAUTION!
Avoid products or automatic car washes that use acidic
solutions or strong alkaline additives or harsh brushes.
Many aftermarket wheel cleaners and automatic car
washes may damage the wheel's protective finish. Such
damage is not covered by the New Vehicle Limited
Warranty. Only car wash soap, Mopar® Wheel Cleaner
or equivalent is recommended.

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SERVICING AND MAINTENANCE357
NOTE:If you intend parking or storing your vehicle for an
extended period after cleaning the wheels with wheel
cleaner, drive your vehicle and apply the brakes to remove the water droplets from the brake components. This
activity will remove the red rust on the brake rotors and
prevent vehicle vibration when braking.
Dark Vapor Chrome, Black Satin Chrome, or Low Gloss
Clear Coat Wheels
SNOW TRACTION DEVICES
Use of traction devices require sufficient tire-to-body
clearance. Due to limited clearance, the following snow
traction devices are recommended. Follow these
recommendations to guard against damage.

Snow traction device must be of proper size for the tire,
as recommended by the snow traction device manu -
facturer.
 No other tire sizes are recommended for use with the
snow traction device.
 Please follow the table for the recommended tire size,
axle and snow traction device:
CAUTION!
Do not use scouring pads, steel wool, a bristle brush,
metal polishes or oven cleaner. These products may
damage the wheel's protective finish. Such damage is
not covered by the New Vehicle Limited Warranty. Only
car wash soap, Mopar® Wheel Cleaner or equivalent is
recommended.
CAUTION!
If your vehicle is equipped with these specialty wheels,
DO NOT USE wheel cleaners, abrasives, or polishing
compounds. They will permanently damage this finish
and such damage is not covered by the New Vehicle
Limited Warranty. HAND WASH ONLY USING MILD SOAP
AND WATER WITH A SOFT CLOTH. Used on a regular
basis; this is all that is required to maintain this finish.
Trim Level AxleTire/Wheel SizeSnow Traction Device (Maximum
Projection Beyond Tire Profile Or Equivalent)
Sport
Rear245/75R17
S Class or Autosock
Willy’s LT255/75R17C
Autosock
Sahara
255/70R18
Rubicon LT285/70R17C
High Altitude 275/55R20
8

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SERVICING AND MAINTENANCE363
CARPET REMOVAL
Front Carpets (Two And Four Door Models):

1. Remove the front grommets.

Front Carpet

2. Pull the carpet out from the front to the rear.

Front Carpet Pulled Away

3. Remove the grommets under the front seat. First for
the rear carpet and then the front carpet.

Front And Rear Carpet Split

4. Under the back of the front seat, open the carpet split and then pull out the rear edge and slide the carpet
to the front (do not remove the harness).

Rear Underside Of Front Seat Carpet Split

WARNING!
If operating the vehicle without carpet in place the
floor may become hot, and there is a risk of burns.
 An improperly attached, damaged, folded, or
damaged grommets may cause your carpet to inter -
fere with the accelerator, brake, or clutch pedals and
cause a loss of vehicle control. To prevent SERIOUS
INJURY or DEATH: ALWAYS securely attach your
carpet using the grommets.
 ALWAYS make sure objects cannot fall or slide into
the driver’s side floor area when the vehicle is
moving. Objects can become trapped under acceler -
ator, brake, or clutch pedals and could cause a loss
of vehicle control.
 NEVER place any objects under the carpet (e.g.,
towels, keys, etc.). These objects could change the
position of the carpet and may cause interference
with the accelerator, brake, or clutch pedals.
 ONLY install carpet designed to fit your vehicle.
NEVER install carpet that cannot be properly
attached and secured to your vehicle. If the carpet
needs to be replaced, only use manufacturer
approved carpet for the specific make, model, and
year of your vehicle.
 If the vehicle carpet has been removed and
re-installed, always properly attach carpet to the floor
and check that the floor mat fasteners are secure to
the vehicle carpet. Fully depress each pedal to check
for interference with the accelerator, brake, or clutch
pedals then re-install the floor mats.
1 — Grommets
8

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368
TECHNICAL SPECIFICATIONS
VEHICLE IDENTIFICATION NUMBER (VIN)
The VIN is found on the left front corner of the A-pillar,
visible from outside of the vehicle through the windshield.

Vehicle Identification Number

NOTE:It is illegal to remove or alter the VIN plate.
BRAKE SYSTEM
Your vehicle is equipped with dual hydraulic brake
systems. If either of the two hydraulic systems lose normal
capability, the remaining system will still function.
However, there will be some loss of overall braking
effectiveness. You may notice increased pedal travel during application, greater pedal force required to slow or
stop, and potential activation of the Brake Warning Light.
In the event power assist is lost for any reason (i.e.,
repeated brake applications with the engine off) the
brakes will still function. However, the effort required to
brake the vehicle will be much greater than that required
with the power system operating.
WHEEL AND TIRE TORQUE SPECIFICATIONS
Proper lug nut/bolt torque is very important to ensure that
the wheel is properly mounted to the vehicle. Any time a
wheel has been removed and reinstalled on the vehicle,
the lug nuts/bolts should be torqued using a properly
calibrated torque wrench using a six-sided (hex) deep wall
socket.
TORQUE SPECIFICATIONS
**Use only authorized dealer recommended lug nuts/bolts
and clean or remove any dirt or oil before tightening.
Inspect the wheel mounting surface prior to mounting the
tire and remove any corrosion or loose particles.Spare Tire Torque Specifications
**Use only authorized dealer recommended lug nuts/bolts
and clean or remove any dirt or oil before tightening.
Spare tire torque is for the spare tire carrier located on the
swing gate.

Wheel Mounting Surface

Tighten the lug nuts/bolts in a star pattern until each nut/
bolt has been tightened twice. Ensure that the socket is
fully engaged on the lug nut/bolt (do not insert it halfway).
Lug Nut/Bolt
Torque **Lug Nut/Bolt
Size Lug Nut/Bolt
Socket Size
130 ft-lb
(176 N·m) M14 x 1.50 22 mm
Lug Nut/Bolt
Torque **Lug Nut/Bolt
Size Lug Nut/Bolt
Socket Size
59 ft-lb (80 N·m) M14 x 1.50 22 mm

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