ECU JEEP CHEROKEE 2023 Workshop Manual

SERVICING AND MAINTENANCE217
Engine Air Cleaner Filter Installation
NOTE:Inspect and clean the housing assembly 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. Install the engine air cleaner filter cover onto the housing assembly locating tabs.
3. Install screws to secure the engine air cleaner filter cover to the housing assembly.
ACCESSORY DRIVE BELT INSPECTION
When inspecting accessory drive belts, small cracks that
run across ribbed surface of belt from rib to rib, are
considered normal. These are not a reason to replace belt.
However, cracks running along a rib (not across) are not
normal. Any belt with cracks running along a rib must be
replaced. Also have the belt replaced if it has excessive
wear, frayed cords or severe glazing.

Accessory Belt (Serpentine Belt)

Conditions that would require replacement:
Rib chunking (one or more ribs has separated from belt
body)
 Rib or belt wear
 Longitudinal belt cracking (cracks between two ribs)
 Belt slips
 Groove jumping (belt does not maintain correct posi -
tion on pulley) 
Belt broken (identify and correct problem before new
belt is installed)
 Noise (objectionable squeal, squeak, or rumble is
heard or felt while drive belt is in operation)
Some conditions can be caused by a faulty component
such as a belt pulley. Belt pulleys should be carefully
inspected for damage and proper alignment.
Belt replacement on some models requires the use of
special tools; we recommend having your vehicle serviced
at an authorized dealer.
AIR CONDITIONER MAINTENANCE
For best possible performance, your air conditioner should
be checked and serviced by an authorized dealer at the
start of each warm season. This service should include
cleaning of the condenser fins and a performance test.
Drive belt tension should also be checked at this time.CAUTION!
Do not overtighten the engine air cleaner filter cover lid
screws or damage may result.
WARNING!
 Do not attempt to inspect an accessory drive belt
with the vehicle running.
 You can be badly injured working on or around a
motor vehicle. Only do service work for which you
have the knowledge and the proper equipment. If
you have any doubt about your ability to perform a
service job, take your vehicle to a competent
mechanic.
WARNING!
Use only refrigerants and compressor lubricants
approved by the manufacturer for your air condi -
tioning system. Some unapproved refrigerants are
flammable and can explode, injuring you. Other
unapproved refrigerants or lubricants can cause the
system to fail, requiring costly repairs. Refer to
Warranty Information Book, located in your owner’s
information kit, for further warranty information.
 The air conditioning system contains refrigerant
under high pressure. To avoid risk of personal injury
or damage to the system, adding refrigerant or any
repair requiring lines to be disconnected should be
done by an experienced technician.
8

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SERVICING AND MAINTENANCE225
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.
Refer to the Maintenance Plan for the proper
maintenance intervals
Úpage 209.
Fluid Level Check — Brake Master Cylinder
The fluid level of the brake 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. For further information
Úpage 256.
AUTOMATIC TRANSMISSION
Special Additives
It is strongly recommended against using any special
additives in the transmission. Automatic Transmission
Fluid (ATF) is an engineered product and its performance
may be impaired by supplemental additives. Therefore, do
not add any fluid additives to the transmission. Avoid
using transmission sealers as they may adversely affect
seals.
Fluid Level Check
The fluid level is preset at the factory and does not require
adjustment under normal operating conditions. Routine
fluid level checks are not required; therefore the
transmission has no dipstick. An authorized dealer can
check your transmission fluid level using special service
tools. If you notice fluid leakage or transmission
malfunction, visit an authorized dealer immediately to
have the transmission fluid level checked. Operating the
vehicle with an improper fluid level can cause severe
transmission damage.
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 manufacturer's recommended brake fluid.
For further information Úpage 256. 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.
 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 a 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.
CAUTION!
Do not use chemical flushes in your transmission as the
chemicals can damage your transmission components.
Such damage is not covered by the New Vehicle Limited
Warranty.
8

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230SERVICING AND MAINTENANCE
F4320 Amp Yellow –Fuel Pump Motor
F44 –30 Amp Pink Trailer Tow Receptacle *
F45 –30 Amp Pink Passenger Door Module (PDM) *
F46 –25 Amp Clear Sunroof Control Module *
F47 ––Not Used
F48 –30 Amp Pink Driver Door Module *
F49 –30 Amp Pink Power Inverter (115 Volt/220 Volt A/C) *
F50 –30 Amp Pink Power Liftgate Module *
F51 ––Not Used
F52 –30 Amp Pink Front Wipers
F53 –30 Amp Pink Brake System Module (BSM) - ECU And Valves
F54 –30 Amp Pink Body Control Module (BCM) Feed 3
F55 10 Amp Red –Blind Spot Sensors*/Rearview Camera*/ Rear Heated Seat Switch *
F56 15 Amp Blue –Ignition Node Module (IGNM) / KIN / RF Hub / Electric Steering Column Lock (ESCL) /USB Port
F57 20 Amp Yellow –Trailer Tow Left Stop/Turn Lights *
F58 10 Amp Red –Occupant Classification Module/VSM/ESCL/TT Mod
F59 –30 Amp Pink Drivetrain Control Module (DTCM) *
F60 20 Amp Yellow –Power Outlet – Center Console
F61 20 Amp Yellow –Trailer Tow Right Stop/Turn Lights *
F62 20 Amp Yellow –Windshield De-Icer *
F63 20 Amp Yellow –Front Heated/Ventilated Seats *
F64 20 Amp Yellow –Rear Heated Seats *
Cavity
Blade Fuse Cartridge Fuse Description
* If Equipped

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263
INDEX
AAbout Your Brakes ....................................................... 253
Adaptive Cruise Control (ACC) (Cruise Control) ...... 90, 92
Adding Engine Coolant (Antifreeze) ............................ 223
Adding Fuel................................................................... 113
Additives, Fuel .............................................................. 255
Air Bag........................................................................... 167 Air Bag Operation.................................................... 168
Air Bag Warning Light .................................... 166
, 169
Driver Knee Air Bag ................................................ 172
Enhanced Accident Response ...................... 175
, 207
Event Data Recorder (EDR).................................... 207 Front Air Bag .................................................. 167
, 169
If Deployment Occurs ............................................. 174
Knee Impact Bolsters ............................................. 172
Maintaining Your Air Bag System .......................... 175
Maintenance ........................................................... 175
Redundant Air Bag Warning Light ......................... 167
Transporting Pets.................................................... 186
Air Bag Light ................................................. 68
, 166, 187
Air Cleaner, Engine (Engine Air Cleaner Filter) ........... 216
Air Conditioner Maintenance ...................................... 217
Air Conditioner Refrigerant ................................. 217
, 218
Air Conditioner System ................................................ 217
Air Conditioning Filter ........................................... 48
, 218
Air Conditioning, Operating Tips ..................................... 48 Air Filter......................................................................... 216
Air Pressure Tires ......................................................................... 241 Alarm
Arm The System......................................................... 20
Disarm The System ................................................... 20
Security Alarm..................................................... 20
, 70
All Wheel Drive (AWD)..................................................... 85 Antifreeze (Engine Coolant) ............................... 223
, 256
Disposal ...................................................................224
Anti-Lock Brake System (ABS) ..................................... 143
Anti-Lock Warning Light.................................................. 70
Assist, Hill Start ............................................................. 148
Audio Systems (Radio) ................................................. 126
Auto Down Power Windows............................................ 53
Auto Up Power Windows ................................................ 53
Automatic Climate Controls ........................................... 45
Automatic Dimming Mirror ............................................. 34 Automatic Door Locks ............................................. 23
, 24
Automatic Headlights ..................................................... 40 Automatic High Beams ................................................... 40
Automatic Temperature Control (ATC) .......................... 48
Automatic Transaxle ....................................................... 81
Automatic Transmission ................................................. 81 Adding Fluid ............................................................. 226
Fluid And Filter Change ...........................................226
Fluid Change ............................................................226Fluid Level Check ....................................................225Fluid Type ................................................................. 226
Special Additives ..................................................... 225Torque Converter....................................................... 85
Autostick.......................................................................... 84 AUX Cord.......................................................................... 50Auxiliary (Power Outlet) .................................................. 51
BBattery.................................................................... 69, 214
Keyless Key Fob Replacement................................. 14
Battery Saver Feature .................................................... 42
Belts, Seat..................................................................... 187
Blind Spot Monitoring .................................................. 150
Body Mechanism Lubrication ...................................... 219
Bodywork ...................................................................... 250
B-Pillar Location ........................................................... 238
Brake Assist System............................................ 144
, 154
Brake Control System .................................................. 143
Brake Fluid.................................................................... 225
Brake System ......................................................225
, 253
Anti-Lock (ABS) ........................................................ 253 Fluid Check .............................................................. 225Master Cylinder ....................................................... 225Parking....................................................................... 78
Warning Light ............................................................ 68
Brake/Transmission Interlock ....................................... 81
Brightness, Interior Lights.............................................. 42
Bulb Replacement ........................................................ 233
Bulbs, Light ................................................................... 188
CCamera, Rear................................................................ 112
Capacities, Fluid ........................................................... 256
Caps, Filler Oil (Engine) ..................................................... 212
, 213
Radiator (Coolant Pressure) ................................... 224
Car Washes................................................................... 250
Carbon Monoxide Warning .......................................... 18811

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264
Care And Maintenance ................................................ 250
Cargo Area Cover ............................................................59
Cargo Compartment ....................................................... 59
Cargo Load Floor ............................................................. 59
Cargo Tie-Downs ............................................................. 59
Cellular Phone .............................................................. 140
Center Seat Storage Compartment ...............................50
Certification Label ........................................................ 113
Changing A Flat Tire ..................................................... 191
Chart, Tire Sizing .......................................................... 236
Chassis Fluids And Lubricants .................................... 257
Check Engine Light (Malfunction Indicator Light) .........75
Checking Your Vehicle For Safety ............................... 186
Checks, Safety.............................................................. 186
Child Restraint.............................................................. 176
Child Restraints
Booster Seats.......................................................... 178
How To Stow An Unused ALR Seat Belt................. 183
Infant And Child Restraints .................................... 177Lower Anchors And Tethers For Children .............. 179Older Children And Child Restraints ...................... 177
Seating Positions .................................................... 178
Clean Air Gasoline........................................................ 254
Cleaning Wheels ..................................................................... 245
Climate Control ............................................................... 45
Cold Weather Operation .................................................77
Compact Spare Tire ..................................................... 245
Console Storage ....................................................................... 50
Contract, Service .......................................................... 260
Cooling Pressure Cap (Radiator Cap) ......................... 224
Cooling System............................................................. 222 Adding Coolant (Antifreeze) ................................... 223Coolant Level .......................................................... 224 Cooling Capacity ...................................................... 256
Disposal Of Used Coolant ....................................... 224
Drain, Flush, And Refill............................................223
Inspection ...................................................... 223
, 224
Points To Remember............................................... 224
Pressure Cap ...........................................................224
Radiator Cap ............................................................224 Selection Of Coolant (Antifreeze) ...........................223
Corrosion Protection ..................................................... 250
Cruise Control (Speed Control) ...................................... 90 Cruise Light .............................................................. 74
, 75
Customer Assistance ....................................................258
Cybersecurity ................................................................ 126
DDaytime Running Lights ................................................. 40
Defroster, Windshield ...................................................187
De-Icer, Remote Start ..................................................... 19 Diagnostic System, Onboard.......................................... 75
Dipsticks Oil (Engine)............................................................... 214
Disable Vehicle Towing................................................. 205
Disposal Antifreeze (Engine Coolant) ....................................224
Door Ajar.......................................................................... 69 Door Ajar Light ................................................................ 69
Door Locks Automatic ............................................................ 23
, 24
Doors ............................................................................... 20
Driver Memory Settings .................................................. 26
Driver’s Seat Back Tilt .................................................... 28 Driving ...........................................................................123
EEasy Entry Seats ............................................................. 31
Electric Brake Control System ..................................... 143 Anti-Lock Brake System .......................................... 143Electronic Roll Mitigation ...............................144
, 150
Electric Parking Brake.................................................... 78
Electrical Power Outlets ................................................. 51 Electronic Stability Control (ESC) ................................ 145
Electronic Throttle Control Warning Light ..................... 69
Emergency SOS Emergency Call................................................ 189
Emergency Gas Can Refueling .................................... 202
Emergency, In Case Of Gear Selector Override ........................................... 203
Hazard Warning Flasher ......................................... 189Jacking ..................................................................... 191Jump Starting .......................................................... 200
Tow Hooks ............................................................... 206
Emission Control System Maintenance ........................ 75
Engine ..................................................................212
, 213
Air Cleaner ............................................................... 216 Break-In Recommendations..................................... 78
Checking Oil Level ................................................... 214
Cooling ..................................................................... 222 Exhaust Gas Caution............................................... 188
Fails To Start ............................................................. 78
Flooded, Starting....................................................... 78
Fuel Requirements.................................................. 254
Jump Starting .......................................................... 200
Oil ............................................................................. 215 Oil Filler Cap ...................................................212
, 213
Oil Filter.................................................................... 216
Oil Reset .................................................................... 64

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266
Engine Oil Reset.........................................................64
Menu Items .........................................................64, 67
Instrument Panel Lens Cleaning ................................. 251
Interior Appearance Care ............................................ 251
Interior Lights ..................................................................42
Inverter Power ..........................................................................52
JJack Location................................................................ 191
Jack Operation ............................................................. 191
Jacking And Tire Changing .......................................... 191
Jump Starting ............................................................... 200
KKey FobArm The System .........................................................20
Disarm The System....................................................20
Key Fob Battery Service (Remote Keyless Entry) .........14
Key Fob Programming (Remote Keyless Entry) ............ 15
Keyless Enter 'n Go™ ...................................................... 22 Passive Entry .............................................................. 22
Keys .................................................................................13 Replacement .............................................................. 15
LLane Change Assist ........................................................42
LaneSense.................................................................... 109
Lap/Shoulder Belts ...................................................... 160
Latches ......................................................................... 188 Hood ...........................................................................56
Leaks, Fluid .................................................................. 188
Life Of Tires .................................................................. 243 Liftgate ............................................................................ 57
Closing........................................................................ 58
Hands-Free ................................................................ 58
Opening ...................................................................... 57
Light Bulbs ....................................................................188
Lights .............................................................................188 Air Bag ..................................................... 68
, 166, 187
Automatic Headlights ................................................ 40
Automatic High Beam ............................................... 40
Brake Assist Warning .............................................. 146 Brake Warning ........................................................... 68
Bulb Replacement...................................................233
Cruise .................................................................. 74
, 75
Daytime Running ....................................................... 40
Engine Temperature Warning................................... 69
Exterior ..............................................................39
, 188
Fog....................................................................... 41, 74
High Beam ................................................... 39, 40, 75
High Beam/Low Beam Select .................................. 40
Hill Descent Control Indicator................................. 146
Illuminated Entry ....................................................... 43
Intensity Control ........................................................ 42
Interior........................................................................ 42
LaneSense .......................................................... 71
, 74
Lights On Reminder................................................... 41
Low Fuel ..................................................................... 71
Malfunction Indicator (Check Engine)...................... 71
Park ............................................................................ 74
Passing....................................................................... 40
Seat Belt Reminder ................................................... 68
Security Alarm............................................................ 70
Service .....................................................................233
Tire Pressure Monitoring (TPMS).....................72
, 155
Traction Control ....................................................... 146 Turn Signals............................................... 42
, 74, 188
Vanity Mirror .............................................................. 34
Load Shed Battery Saver Mode..................................... 67
Load Shed Battery Saver On ......................................... 67 Load Shed Electrical Load Reduction ........................... 67Load Shed Intelligent Battery Sensor ........................... 67Loading Vehicle ............................................................ 113 Tires ......................................................................... 238
Locks Automatic Door .................................................. 23
, 24
Child Protection ......................................................... 24
Power Door ................................................................ 21
Low Tire Pressure System............................................ 155
Lubrication, Body.......................................................... 219
Lug Nuts/Bolts ............................................................. 253
Luggage Carrier .............................................................. 60
MMaintenance................................................................... 56
Maintenance Free Battery ........................................... 214
Maintenance Schedule ................................................ 208
Malfunction Indicator Light (Check Engine) .......... 71
, 75
Manual Service ..................................................................... 261
Media Hub ...................................................................... 50 Memory Feature (Memory Seats).................................. 26Methanol ....................................................................... 254
Mirrors ............................................................................. 34 Heated ....................................................................... 35
Outside....................................................................... 34
Power ......................................................................... 35
Rearview ........................................................... 34
, 189
Vanity ......................................................................... 34

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268
Remote Sound System (Radio) Control ...................... 140
Remote Starting
Exit Remote Start Mode ............................................18
Uconnect Customer Programmable Features .........19
Uconnect Settings...................................................... 19
Remote Starting System.................................................18
Replacement Keys ..........................................................15 Replacement Tires ....................................................... 243
Reporting Safety Defects............................................. 261
Restraints, Child ........................................................... 176
Restraints, Head ............................................................. 32
Roll Over Warning ............................................................. 8
Roof Type Carrier ............................................................60
Rotation, Tires .............................................................. 248
SSafety Checks Inside Vehicle ...................................... 187
Safety Checks Outside Vehicle ................................... 188
Safety Defects, Reporting............................................ 261
Safety Information, Tire ............................................... 235
Safety Tips .................................................................... 186
Schedule, Maintenance............................................... 208
Seat Belt Reminder.........................................................68 Seat Belts ............................................................ 159
, 187
Adjustable Shoulder Belt........................................ 162
Adjustable Upper Shoulder Anchorage ................. 162
Adjustable Upper Shoulder Belt Anchorage.......... 162
Automatic Locking Retractor (ALR)........................ 165
Child Restraints ...................................................... 176
Energy Management Feature ................................ 165
Extender .................................................................. 164
Front Seat..............................................159
, 160, 161
Inspection................................................................ 187 Lap/Shoulder Belt Operation ................................. 161
Lap/Shoulder Belt Untwisting ................................ 162
Lap/Shoulder Belts ................................................. 160
Operating Instructions............................................. 161Pregnant Women..................................................... 165Pretensioners .......................................................... 165
Rear Seat ................................................................. 160
Reminder ................................................................. 159
Seat Belt Extender...................................................164
Seat Belt Pretensioner ............................................165
Untwisting Procedure .............................................. 162
Seat Belts Maintenance ............................................... 251
Seats................................................................................ 28 Adjustment.......................................................... 28
, 30
Easy Entry .................................................................. 31
Head Restraints......................................................... 32
Heated........................................................................ 31
Memory ...................................................................... 26
Rear Folding............................................................... 28
Tilting .......................................................................... 28
Vented ........................................................................ 32
Ventilated ................................................................... 32
Security Alarm .......................................................... 20
, 70
Arm The System......................................................... 20
Disarm The System ................................................... 20
Selec-Terrain ................................................................... 88 Sentry Key (Immobilizer) ................................................ 16
Sentry Key Replacement................................................ 15
Service Assistance........................................................ 258
Service Contract ...........................................................260
Service Manuals ...........................................................261
Settings ......................................................................... 126
Shift Lever Override ...................................................... 203 Shifting
Automatic Transmission ........................................... 81
Power Transfer Unit, Shifting Into PowerTransfer Unit Neutral (N) ..........................122
, 123
Transfer Case, Shifting Into Transfer Case Neutral (N) .......................................................... 122
Transfer Case, Shifting Out Of Transfer Case Neutral (N) .......................................................... 123
Shoulder Belts .............................................................. 160
Side Distance Warning System ................................... 104
Side View Mirror Adjustment ......................................... 34 Signals, Turn .......................................................... 74
, 188
Snow Chains (Tire Chains) ........................................... 246
Snow Tires .................................................................... 244
Spare Tires ...........................................................244
, 245
Speed Control Cancel ........................................................................ 92
Resume...................................................................... 91
Starting............................................................................ 77 Button ........................................................................ 16
Cold Weather............................................................. 77
Engine Fails To Start ................................................. 78
Remote ...................................................................... 18
Starting Procedures ....................................................... 77 Steering Tilt Column................................................................. 24
Wheel, Heated .................................................... 24
, 25
Steering Wheel Audio Controls .................................... 140
Steering Wheel Mounted Sound System Controls ..... 140
Stop/Start ................................................................ 74
, 89
Storage ..................................................................... 49, 50
Console ...................................................................... 50
Storage Compartment, Center Seat.............................. 50
Storage, Vehicle..................................................... 48
, 250

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