2023 JEEP GLADIATOR fuel

364SERVICING AND MAINTENANCE
(Continued)
CHECKING OIL LEVEL
To ensure proper engine lubrication, the engine oil
must be maintained at the correct level. Check the
oil level at regular intervals, such as every fuel
stop. The best time to check the engine oil level is
about five minutes after a fully warmed up engine
is shut off.
Checking the oil while the vehicle is on level ground
will improve the accuracy of the oil level readings.
There are four possible dipstick types:
Crosshatched zone.
Crosshatched zone marked SAFE.
Crosshatched zone marked with MIN at the low
end of the range and MAX at the high end of the
range.
Crosshatched zone marked with dimples at the
MIN and the MAX ends of the range.
NOTE:Always maintain the oil level within the crosshatch
markings on the dipstick.
Adding 1 qt (1 L) of oil when the reading is at the
low end of the dipstick range will raise the oil level
to the high end of the range marking.
ADDING WASHER FLUID
The fluid reservoir is located in the engine
compartment. Be sure to check the fluid level at
regular intervals. Fill the reservoir with windshield
washer solvent only (not radiator antifreeze). When
refilling the washer fluid reservoir, take some
washer fluid and apply it to a cloth or towel and
wipe clean the wiper blades; this will help blade
performance.
To prevent freeze-up of your windshield washer
system in cold weather, select a solution or mixture
that meets or exceeds the temperature range of
your climate. This rating information can be found
on most washer fluid containers.
MAINTENANCE-FREE BATTERY
Your vehicle is equipped with a maintenance-free
battery. You will never have to add water, and
periodic maintenance is not required.
CAUTION!
Overfilling or underfilling the crankcase will
cause aeration or loss of oil pressure. This could
damage your engine.
WARNING!
Commercial windshield washer solvents are
flammable. They could ignite and burn you. Care
must be exercised when filling or working around
the washer solution.
WARNING!
Battery fluid is a corrosive acid solution and
can burn or even blind you. Do not allow
battery fluid to contact your eyes, skin, or
clothing. Do not lean over a battery when
attaching clamps. If acid splashes in eyes or
on skin, flush the area immediately with large
amounts of water Úpage 343.
Battery gas is flammable and explosive. Keep
flame or sparks away from the battery. Do not
use a booster battery or any other booster
source with an output greater than 12 Volts.
Do not allow cable clamps to touch each
other.
Battery posts, terminals, and related accesso -
ries contain lead and lead compounds. Wash
hands after handling.

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368SERVICING AND MAINTENANCE
2. Lift the engine air cleaner filter cover to access the engine air cleaner filter.
3. Remove the engine air cleaner filter from the housing assembly.

Engine Air Cleaner Filter

Engine Air Cleaner Filter Installation
NOTE:Inspect and clean the housing only if significant
dirt or debris is present before replacing the engine
air cleaner filter.
1. Install the engine air cleaner filter into the
housing assembly with the engine air cleaner
filter inspection surface facing downward.

2. Tighten engine air cleaner filter cover fasteners using a suitable tool.
DRAINING FUEL/WATER SEPARATOR
F
ILTER — DIESEL ENGINE
The fuel/water separator housing is located inside
the left frame rail in front of the fuel tank. The best
access to this water drain valve is from under the
vehicle. If necessary remove the fuel filter protective cover
to access the water drain valve.

Fuel/Water Separator Filter

If water is detected in the water separator while the
engine is running, or while the ignition switch is in
the ON position, the Water In Fuel Indicator Light
will illuminate and an audible chime will be heard.
At this point you should stop the engine and drain
the water from the filter housing.
1 — Engine Air Cleaner Filter Cover
2 — Engine Air Cleaner Filter
CAUTION!
Do not overtighten the engine air cleaner filter
cover lid screws or damage may result.
CAUTION!
Do not drain the fuel/water separator filter
when the engine is running.
Diesel fuel will damage blacktop paving
surfaces. Drain the filter into an appropriate
container.
1 — Retainers
2 — Fuel Filter Protective Cover

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SERVICING AND MAINTENANCE369

Fuel/Water Separator Filter

Within 10 minutes of vehicle shutdown, turn the
filter drain valve (located on the bottom of the filter
housing) counterclockwise to drain fuel/water;
allow the accumulated water to drain. Leave the
drain valve open until all water and contaminants
have been removed. When clear fuel is visible,
close the drain valve by turning it clockwise.
Upon proper draining of the water from fuel filter
assembly, the Water In Fuel Indicator Light will
remain illuminated for approximately 10 seconds.
If the water was drained while the engine was
running, the Water In Fuel Indicator Light may
remain on for approximately three minutes.
NOTE:Care should be taken in disposing of used fluids
from your vehicle. Used fluids, indiscriminately
discarded, can present a problem to the envi -
ronment. Contact an authorized dealer, service
station, or government agency for advice on recy -
cling programs and for where used fluids and
filters can be properly disposed of in your area.
If more than two ounces or 60 ml of fuel have been
drained, follow the directions for Priming If The
Engine Has Run Out Of Fuel Ú page 370.
FUEL FILTER REPLACEMENT — DIESEL
E
NGINE
NOTE:Using a fuel filter that does not meet FCA US LLC
filtration and water separating requirements can
severely impact fuel system life and reliability.
1. Ensure engine is turned off.

2. Remove the fuel filter protective cover to
access the fuel filter assembly.

Fuel Filter Assembly

3. Place drain pan under the fuel filter assembly.
4. Open the water drain valve, and let any accumulated water and fuel drain.
1 — Water In Fuel Drain Valve
CAUTION!
Diesel fuel will damage blacktop paving
surfaces. Drain the filter into an appropriate
container.
Do not prefill the fuel filter when installing a
new fuel filter. There is a possibility debris
could be introduced into the fuel filter during
this action. It is best to install the filter dry and
allow the in-tank lift pump to prime the fuel
system.
1 — Retainers
2 — Fuel Filter Protective Cover
8

23_JT_OM_EN_USC_t.book Page 369

370SERVICING AND MAINTENANCE
5. Close the water drain valve.

Fuel Filter Assembly

6. Wipe clean the underside of the filter housing to prevent contamination from entering fuel
system during service.
7. Remove the fuel filter cap and filter from the housing using a socket. Rotate counter -
clockwise for removal.
Fuel Filter Assembly

8. Remove the used fuel filter cartridge from the cap and dispose of according to your local
regulations.
9. Wipe clean the sealing surfaces of the cap and housing. 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. 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,
approximately 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 approxi -
mately 30 seconds. Repeat this process twice.
1 — Water Drain Valve
1 — Fuel Filter Cap
2 — Socket Adapter
CAUTION!
Take care when handling the new fuel filter to
prevent contamination from entering the fuel
system.
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.

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SERVICING AND MAINTENANCE371
3. Start the engine using the Normal Starting procedure Ú page 148.
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
negatively impact the fuel filter's ability to sepa -
rate water from the fuel, resulting in high pres -
sure fuel system corrosion or damage.
In addition, commercially available fuel addi -
tives 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 Ú
page 121.
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 reacts with engine
exhaust in the presence of a catalyst to convert
smog-forming Nitrogen Oxides (NOx) into harmless
nitrogen and water vapor.
For further information Ú page 424.
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 as grass or
leaves, and those items that come into contact
with your exhaust system. Do not park or oper -
ate your vehicle in areas where your exhaust sys -
tem can contact anything that can burn.
8

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376SERVICING AND MAINTENANCE
(Continued)
EXHAUST SYSTEM
The best protection against carbon monoxide entry
into the vehicle body is a properly maintained
engine exhaust system.
If you notice a change in the sound of the exhaust
system, or if the exhaust fumes can be detected
inside the vehicle, or when the underside or rear of
the vehicle is damaged, have an authorized
technician inspect the complete exhaust system
and adjacent body areas for broken, damaged,
deteriorated, or mispositioned parts. Open seams
or loose connections could permit exhaust fumes
to seep into the passenger compartment. In
addition, have the exhaust system inspected each
time the vehicle is raised for lubrication or oil
change. Replace as required. Under normal operating conditions, the catalytic
converter will not require maintenance. However, it
is important to keep the engine properly tuned to
ensure proper catalyst operation and prevent
possible catalyst damage.
NOTE:Intentional tampering with emissions control
systems can result in civil penalties being
assessed against you.
In unusual situations involving grossly
malfunctioning engine operation, a scorching odor
may suggest severe and abnormal catalyst
overheating. If this occurs, stop the vehicle, turn off
the engine and allow it to cool. Service, including a
tune-up to manufacturer's specifications, should
be obtained immediately.
To minimize the possibility of catalytic converter
damage:
Do not interrupt the ignition when the transmis
-
sion is in gear and the vehicle is in motion.
Do not try to start the vehicle by pushing or
towing the vehicle.
Do not idle the engine with any ignition compo -
nents disconnected or removed, such as when
diagnostic testing, or for prolonged periods
during very rough idle or malfunctioning oper -
ating conditions.
WARNING!
Exhaust gases can injure or kill. They contain
Carbon Monoxide (CO), which is colorless and
odorless. Breathing it can make you uncon -
scious and can eventually poison you. To
avoid breathing CO see Ú page 328.
A hot exhaust system can start a fire if you
park over materials that can burn, such as
grass or leaves, and those items that come
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.
CAUTION!
The catalytic converter requires the use of
unleaded fuel only. Leaded gasoline will
destroy the effectiveness of the catalyst as an
emissions control device, may seriously
reduce engine performance and cause
serious damage to the engine.
Damage to the catalytic converter can result if
your vehicle is not kept in proper operating
condition. In the event of engine malfunction,
particularly involving engine misfire or other
apparent loss of performance, have your
vehicle serviced promptly. Continued opera -
tion of your vehicle with a severe malfunction
could cause the converter to overheat,
resulting in possible damage to the converter
and vehicle.
WARNING!

23_JT_OM_EN_USC_t.book Page 376

SERVICING AND MAINTENANCE379
Coolant Level
The coolant bottle provides a quick visual method
for determining that the coolant level is adequate.
With the engine in the off and cold, the level of the
engine coolant (antifreeze) in the bottle should be
between the ranges indicated on the bottle.
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
only needs to be checked once a month.
When additional engine coolant is needed to
maintain the proper level, only OAT coolant that
meets the requirements of FCA 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/kilo -
meters 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 freezing point of the coolant in the
radiator and in the coolant expansion bottle. If
determined that more engine coolant needs to
be added to the radiator, 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 corro
-
sion 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. With air
conditioning, keep the front of the condenser
clean.
Do not change the thermostat for Summer or
Winter operation. If replacement is ever neces -
sary, install ONLY the correct type thermostat. Other designs may result in unsatisfactory
engine system performance, poor gas mileage,
and increased emissions.
CHARGE AIR COOLER — INTER-COOLER
(D
IESEL ENGINE)
The charge air cooler is positioned in front of the
radiator and the air conditioner condenser. Air
enters the engine through the air cleaner and
passes through the turbocharger, where it is
pressurized. This pressurized air rapidly reaches
high temperature. The air is then directed through
a hose to the charge air cooler and through
another hose to the intake manifold of the engine.
This cooling process enables more efficient
burning of fuel resulting in fewer emissions.
To guarantee optimum performance of the system,
keep the surfaces of the charge air cooler,
condenser and radiator clean and free of debris.
Periodically check the hoses leading to and from
the charge air cooler for cracks or loose clamps
resulting in loss of pressure and reduced engine
performance.
8

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386SERVICING AND MAINTENANCE
CavityCartridge Fuse Micro Fuse Description

* If Equipped
F01 ––Spare*
F02 40 Amp Green –Starter
F03 –5 Amp Tan Intelligent Battery Sensor (IBS)
F04 –20 Amp Yellow Fuel Pump MTR/FPCM
F05 –5 Amp Tan Security Gateway
F06 ––Spare*
F07 ––Spare*
F08 –15 Amp Blue Trans Control Module TCM-8HP CYGNUS
F09 ––Spare*
F10 –15 Amp BlueKeyless Ignition Node (KIN)/Radio Frequency Hub (RFHUB)/
Electric Steering Column Lock (ESCL)
F11 –10 Amp Red UCI Port (USB & AUX)
F12 –25 Amp Clear HIFI Amplifier
F13 ––Spare*
F14 ––Spare*
F15 –15 Amp BlueInstrument Panel Cluster (IPC)/Switch Bank-Heavy Duty
Electrical Pkg (SWITCH BANK-HD ELEC)
F16 ––Spare*
F17 ––Spare*
F18 –10 Amp Red Air Conditioning Clutch (AC CLUTCH)
F19 ––Spare*

23_JT_OM_EN_USC_t.book Page 386