2016 JEEP GRAND CHEROKEE ECU

ONBOARD DIAGNOSTIC SYSTEM (OBD II)
Your vehicle is equipped with a sophisticated onboard
diagnostic system called OBD II. This system monitors
the performance of the emissions, engine, and automatic
transmission control systems. When these systems are
operating properly, your vehicle will provide excellent
performance and fuel economy, as well as engine emis-
sions well within current government regulations.
If any of these systems require service, the OBD II system
will turn on the “Malfunction Indicator Light (MIL).” It
will also store diagnostic codes and other information to
assist your service technician in making repairs. Al-
though your vehicle will usually be drivable and not
need towing, see your authorized dealer for service as
soon as possible.
CAUTION!
•Prolonged driving with the MIL on could cause
further damage to the emission control system. It
could also affect fuel economy and driveability.
The vehicle must be serviced before any emissions
tests can be performed.
• If the MIL is flashing, while the engine is running,
severe catalytic converter damage and power loss
will soon occur. Immediate service is required.
Onboard Diagnostic System (OBD II)
Cybersecurity
Your vehicle is required to have an Onboard Diagnostic
system (OBD II) and a connection port to allow access to
information related to the performance of your emissions
controls. Authorized service technicians may need to
7
MAINTAINING YOUR VEHICLE 633

access this information to assist with the diagnosis and
service of your vehicle and emissions system.
WARNING!
•ONLY an authorized service technician should con-
nect equipment to the OBD II connection port in
order to diagnose or service your vehicle.
• If unauthorized equipment is connected to the
OBD II connection port, such as a driver-behavior
tracking device, it may:
• Be possible that vehicle systems, including
safety related systems, could be impaired or a
loss of vehicle control could occur that may result
in an accident involving serious injury or death.
• Access, or allow others to access, information
stored in your vehicle systems, including per-
sonal information. For further information, refer to “Privacy Practices — If
Equipped With Uconnect 8.4 Radio” and “Uconnect
CyberSecurity” in “All About Uconnect Access” in your
Owner ’s Manual Radio Supplement and “Cybersecurity”
in “Understanding Your Instrument Panel”.
EMISSIONS INSPECTION AND MAINTENANCE
PROGRAMS
In some localities, it may be a legal requirement to pass
an inspection of your vehicle’s emissions control system.
Failure to pass could prevent vehicle registration.
For states that require an Inspection and Mainte-
nance (I/M), this check verifies the “Malfunction
Indicator Light (MIL)” is functioning and is not
on when the engine is running, and that the OBD II
system is ready for testing.
634 MAINTAINING YOUR VEHICLE

2. There are glove compartment travel stops on bothsides of the glove compartment door, partially close
the glove compartment door and push inward to
release the glove compartment travel stop on one side
and repeat this procedure for the opposite side.
3. Pull the right hand side of the glove compartment door toward the rear of the vehicle to disengage the
glove compartment door from its hinges.
NOTE: When disengaging the glove compartment door
from its hinges, there will be some resistance.
4. With the glove compartment door loose, remove the glove compartment tension tether and tether clip by
sliding the clip toward the face of the glove compart-
ment door and lifting the clip out of glove compart-
ment door. 5. Remove the filter cover by disengaging the retaining
tab and mid way snap that secures the filter cover to
the HVAC housing. Disengage the mid way snap by
Right Side Of Glove Compartment
1 — Glove Compartment Tension Tether
2 — Glove Compartment Door
650 MAINTAINING YOUR VEHICLE

Fluid Level Check — Brake Master Cylinder
The fluid level of the master cylinder should be checked
when performing under the hood service, or immedi-
ately if the brake system warning lamp indicates system
failure.
The brake master cylinder has a plastic reservoir. On the
outboard side of the reservoir, there is a “MAX” mark
and a “MIN” mark. The fluid level must be kept within
these two dots. Do not add fluid above the MAX mark,
because leakage may occur at the cap.
With disc brakes, the fluid level can be expected to fall as
the brake linings wear. However, an unexpected drop in
fluid level may be caused by a leak and a system check
should be conducted.
Refer to “Fluids, Lubricants, and Genuine Parts” in
“Maintaining Your Vehicle” for further information.
WARNING!
•Use only manufacturer’s recommended brake
fluid. Refer to “Fluids, Lubricants, And Genuine
Parts” in “Maintaining Your Vehicle” for further
information. 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
moisture, 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
(Continued)
7
MAINTAINING YOUR VEHICLE 669

About Your Brakes....................... .507
Adaptive Cruise Control (ACC) (Cruise Control) . . .193
Adding Engine Coolant (Antifreeze) ............664
Adding Fuel ............................ .569
Additives, Fuel .......................... .567
Adjust Forward ............................. .146
Rearward ............................ .146
AirBag.............................. .68, 69
Advance Front Air Bag .................69, 70
Air Bag Operation .......................71
Air Bag Warning Light ....................80
Driver Knee Air Bag ......................73
Enhanced Accident Response ................79
Event Data Recorder (EDR) .................83
FrontAirBag ........................68, 69
If A Deployment Occurs ...................78
Knee Impact Bolsters .....................72
Maintaining Your Air Bag System ............82Redundant Air Bag Warning Light
............81
Side Air Bags ...........................73
Transporting Pets ...................... .109
Air Bag Deployment ........................68
Air Bag Light ..................... .80, 112, 302
Air Bag Maintenance .......................82
Air Cleaner, Engine (Engine Air Cleaner Filter) . . . .641
Air Conditioner Maintenance .................647
Air Conditioning Filter ...............428, 642, 649
Air Conditioning, Operating Tips ...........427, 429
Air Conditioning Refrigerant ..............647, 648
Air Conditioning System .................426, 647
Air Pressure, Tires ........................ .542
Air Suspension .......................... .488
Alarm Arm The System ........................21
Disarm The System .......................21
Alarm, Panic .............................26
Alarm (Security Alarm) ............20, 305, 312, 333
722 INDEX

Alarm System (Security Alarm)................20
Alterations/Modifications, Vehicle ...............9
Antifreeze (Engine Coolant) ...............663, 698
Disposal ............................. .666
Anti-Lock Brake System (ABS) ................509
Anti-Lock Warning Light ....................320
Appearance Care ........................ .674
Arming System (Security Alarm) ...............20
Assist, Hill Start ......................... .512
Auto Down Power Windows ..................44
Automatic Door Locks ......................35
Automatic Headlights ..................... .170
Automatic High Beams .....................171
Automatic Temperature Control (ATC) .......417, 426
Automatic Transmission .................469, 673
Adding Fluid ......................... .673
Fluid And Filter Changes ..................673
Fluid Change ......................... .673
Fluid Level Check ...................672, 673 Fluid Type
........................ .672, 701
Gear Ranges .......................... .470
Special Additives ...................... .672
Auxiliary Electrical Outlet (Power Outlet) ........271
Auxiliary Power Outlet .....................271
Axle Fluid ............................. .701
Battery ............................ .308, 646
Charging System Light ...................308
Keyless Transmitter Replacement (RKE) ........26
Belts, Seat ...............................112
Blind Spot Monitoring ..................... .135
Body Mechanism Lubrication .................652
B-Pillar Location ......................... .536
Brake Assist System ........................511
Brake Control System, Electronic ..............508
Brake Fluid ......................... .669, 701
Brake System ........................ .507, 668
Anti-Lock (ABS) ....................... .507
10
INDEX 723

Liftgate.................................47
Liftgate Window Wiper/Washer ...............288
Light Bulbs ..............................114
Lights ..............................114,169
AirBag ........................80, 112, 302
Automatic Headlights ....................170
Back-Up ............................. .694
Brake Assist Warning ....................518
Brake Warning ........................ .303
Bulb Replacement ...................... .691
Cargo .............................. .283
Center Mounted Stop ....................697
Cruise ........................... .328, 331
Daytime Running ...................... .172
Dimmer Switch, Headlight .................169
Engine Temperature Warning ...............307
Exterior ..............................114
Fog ................................ .693
Hazard Warning Flasher ..................600 Headlights
........................... .692
Headlights On With Wipers ................170
Hill Descent Control Indicator ..............522
Illuminated Entry ........................23
Low Fuel ............................ .321
Malfunction Indicator (Check Engine) .........314
Map Reading ......................... .176
Park ............................ .326, 328
Passing ............................. .179
Reading .......................... .176, 252
Rear Servicing ........................ .694
Rear Tail Lamps ....................... .694
Seat Belt Reminder ..................... .301
Security Alarm ........................ .305
Service .............................. .691
Side Marker .......................... .694
Tire Pressure Monitoring (TPMS) ............317
Traction Control ....................... .518
T

urn Signal ..............114, 169, 327, 693, 694
10
INDEX 731

Adjustment....................... .146, 148
Easy Entry ........................... .166
Heated .............................. .151
Memory ............................. .162
Rear Folding ......................... .160
Reclining ............................ .149
Vented .............................. .154
Ventilated ............................ .154
Security Alarm ........................ .20, 305
Arm The System ........................21
Disarm The System .......................21
Selec-Terrain ............................ .486
Selection Of Coolant (Antifreeze) ..............699
SENTRY KEY Key Programming .......................20
Sentry Key (Immobilizer) ....................18
Sentry Key Replacement .....................19
Service Assistance .........................711
Service Contract ......................... .713Service Manuals
......................... .716
Shifting ............................... .465
Automatic Transmission ...............465, 469
Shoulder Belts ............................55
Signals, Turn ...................114, 327, 693, 694
Snow Chains (Tire Chains) ...................553
Snow Plow ............................. .589
Snow Tires ............................. .546
Spare Tire .....................547, 548, 549, 605
Spark Plugs ............................ .699
Speed Control Accel/Decel ....................... .190, 192
Accel/Decel (ACC Only) ..................200
Cancel .............................. .190
Resume ............................. .190
Set................................. .190
Speed Control (Cruise Control) .........188, 189, 193
Starting ............................. .29, 456
Automatic Transmission ..................456
10
INDEX 737