ECU JEEP WRANGLER 2009 JK / 3.G Service Manual

13. Airbag Warning LightThis indicator lights and remains lit for six to
eight seconds when the ignition is first turned
on. If the light does not come on for six to eight
seconds, stays on or comes on while driving,
have the airbag system checked by an authorized dealer.
14. Rear Axle Lock Indicator — If Equipped This light indicates when the rear axle lock has
been activated.
15. Tachometer
Indicates the engine speed in revolutions per minute
(RPM).
CAUTION!
Do not operate the engine with the tachometer
pointer in the red area. Engine damage will occur. 16. Engine Temperature Warning Light
This light warns of an overheated engine condi-
tion. If the engine is critically hot, a warning chime
will sound 10 times. After the chime turns off, the
engine will still be critically hot until the light goes out.
17. Vehicle Security Light — If Equipped This light will flash at a fast rate for approxi-
mately 15 seconds, when the vehicle security
alarm is arming, and then will flash slowly
until the vehicle is disarmed.
18. Temperature Gauge
The temperature gauge shows engine coolant tempera-
ture. Any reading within the normal range indicates that
the engine cooling system is operating satisfactorily.
The gauge pointer will likely indicate a higher tempera-
ture when driving in hot weather, up mountain grades,
or when towing a trailer. It should not be allowed to
exceed the upper limits of the normal operating range.
204 UNDERSTANDING YOUR INSTRUMENT PANEL

your vehicle’s steering, handling and traction. Control-
ling your vehicle is one of the keys to successful off-road
driving, so always keep a firm grip on the steering wheel
and maintain a good driving posture. Avoid sudden
accelerations, turns or braking. In most cases, there are no
road signs, posted speed limits or signal lights. Therefore,
you will need to use your own good judgment on what is
safe and what is not. When on a trail, you should always
be looking ahead for surface obstacles and changes in
terrain. The key is to plan your future driving route while
remembering what you are currently driving over.
CAUTION!
Never park your vehicle over dry grass or other
combustible materials. The heat from your vehicle
exhaust system could cause a fire.
WARNING!
Always wear your seat belt and firmly tie down
cargo. Unsecured cargo can become projectiles in an
off-road situation.
When to Use 4L (Low) Range
When off-road driving, shift into 4L (Low) for additional
traction and control on slippery or difficult terrain,
ascending or descending steep hills, and to increase low
speed pulling power. This range should be limited to
extreme situations such as deep snow, mud, steep in-
clines, or sand where additional low speed pulling power
is needed. Vehicle speeds in excess of 25 mph (40 km/h)
should be avoided when in 4L (Low) range.
Simultaneous Brake and Throttle Operation
Many off-road driving conditions require the simulta-
neous use of the brake and throttle (two-footed driving).
When climbing rocks, logs, or other stepped objects,
302 STARTING AND OPERATING

The entire vehicle should first be weighed on a commer-
cial scale to ensure that the GVWR has not been ex-
ceeded. The weight on the front and rear of the vehicle
should then be determined separately to be sure that the
load is properly distributed over front and rear axle.
Weighing the vehicle may show that the GAWR of either
the front or rear axles has been exceeded, but the total
load is within the specified GVWR. If so, weight must be
shifted from front to rear, or rear to front, as appropriate
until the specified weight limitations are met. Store the
heavier items down low and be sure that the weight is
distributed equally. Stow all loose items securely before
driving.
Improper weight distributions can have an adverse affect
on the way your vehicle steers and handles, and the way
the brakes operate.CAUTION!
Do not load your vehicle any heavier than the GVWR
or the maximum front and rear GAWR. If you do,
parts on your vehicle can break, or it can change the
way your vehicle handles. This could cause you to
lose control. Also, overloading can shorten the life of
your vehicle.
TRAILER TOWING
In this section, you will find safety tips and information
on limits to the type of towing you can reasonably do
with your vehicle. Before towing a trailer, carefully
review this information to tow your load as efficiently
and safely as possible.
To maintain warranty coverage, follow the requirements
and recommendations in this Owner’s Manual concern-
ing vehicles used for trailer towing.
5
STARTING AND OPERATING 365

NOTE:Remember that everything put into or on the
trailer adds to the load on your vehicle. Also, additional
factory-installed options, or authorized dealer-installed
options, must be considered as part of the total load on
your vehicle. Refer to the Tire and Loading Information
placard in the “Tire Safety Information” section of this
manual for the maximum combined weight of occupants
and cargo for your vehicle.
Towing Requirements
To promote proper break-in of your new vehicle drive-
train components, the following guidelines are recom-
mended:
NOTE: Trailer towing requires special rear axle lubri-
cant. Refer to “Fluids, Lubricants, and Genuine Parts” in
Section 7 for the correct fluid type.
CAUTION!
•Avoid towing a trailer for the first 500 miles
(805 km) of vehicle operation. Doing so may dam-
age your vehicle.
WARNING!
Improper towing can lead to an injury accident.
Follow these guidelines to make your trailer towing
as safe as possible:
•Make certain that the load is secured in the trailer
and will not shift during travel. When trailering
cargo that is not fully secured, dynamic load shifts
can occur that may be difficult for the driver to
control. You could lose control of your vehicle and
have an accident.
(Continued)
376 STARTING AND OPERATING

7. Release the brake pedal and ensure that there is no
vehicle movement.
8. Turn the engine off and turn the ignition switch to the
ACC position.
9. Shift the automatic transmission into PARK.
10. Apply the parking brake.
11. Attach the vehicle to the tow vehicle with the tow bar.
12. Release the parking brake.
13. Disconnect the negative battery cable, and secure it
away from the negative battery post.CAUTION!
Damage to the transmission may occur if the trans-
mission is shifted into PARK with the transfer case in
N (Neutral) and the engine running. With the trans-
fer case in N (Neutral) ensure that the engine is off
prior to shifting the transmission into PARK (refer to
steps8–9above).
Shifting Out of Neutral (N)
Use the following procedure to prepare your vehicle for
normal usage.
1. Turn the engine off.
2. Shift the automatic transmission into NEUTRAL or
press the clutch pedal on a manual transmission.
3. Shift the transfer case lever into the desired position.
4. Start the engine.
384 STARTING AND OPERATING

WARNING! (Continued)
•Do not let anyone sit in the vehicle when it is on a
jack.
•Do not get under the vehicle when it is on a jack.
•Only use the jack in the positions indicated and
for lifting this vehicle during a tire change.
•If working on or near a roadway, be extremely
careful of motor traffic.
•To assure that spare tires, flat or inflated, are
securely stowed, spares must be stowed with the
valve stem facing the ground.
•Turn on the Hazard Warning flasher.1. Remove the spare tire, jack and tools from the stored
location.
2. Loosen (but do not remove) the wheel lug nuts by
turning them to the left one turn while the wheel is still
on the ground.
3. Assemble the jack and jacking tools. Connect the jack
handle driver to the extension, then to the lug wrench.
4. Operate the jack from the front or the rear of the
vehicle. Place the jack under the axle tube, as shown.
Do
not raise the vehicle until you are sure the jack is fully
engaged.
Jack Warning Label
392 WHAT TO DO IN EMERGENCIES

wheel nut tightness is 95 ft lbs (130 N·m). If in doubt
about the correct tightness, have them checked with a
torque wrench by your authorized dealer or at a service
station.
10. Remove the jack assembly and wheel blocks.
WARNING!
A loose tire or jack, thrown forward in a collision or
hard stop, could endanger the occupants of the ve-
hicle. Always stow the jack parts and the spare tire in
the places provided.
11. Secure the tire, jack, and tools in their proper
locations.
JUMP-STARTING
If the vehicle has a discharged battery, booster cables may
be used to obtain a start from a booster battery or the
battery in another vehicle. This type of start can be dangerous if done improperly, so follow this procedure
carefully.
WARNING!
•Battery fluid is a corrosive acid solution; do not
allow battery fluid to contact eyes, skin or cloth-
ing. Do not lean over a battery when attaching
clamps or allow the clamps to touch each other. If
acid splashes in your eyes or on skin, flush the
contaminated area immediately with large quanti-
ties of water.
•A battery generates hydrogen gas which is flam-
mable and explosive. Keep flames or sparks away
from the vent holes.
•Do not use a booster battery or any other booster
source that has a greater than 12 Volt system (i.e.,
do not use a 24 Volt power source).
394 WHAT TO DO IN EMERGENCIES

WARNING! (Continued)
•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 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 accident.
•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.(Continued)
WARNING! (Continued)
•Do not allow petroleum based fluid to contami-
nate the brake fluid. Brake seal components could
be damaged, causing partial or complete brake
failure. This could result in an accident.
Automatic Transmission — If Equipped
Selection of Lubricant
It is important that the proper lubricant is used in the
transmission to assure optimum transmission perfor-
mance. Use only manufacturer’s recommended transmis-
sion fluid. Refer to “Fluids, Lubricants, and Genuine
Parts” in this section for the correct fluid type. It is
important that the transmission fluid be maintained at
the prescribed level using the recommended fluid.
7
MAINTAINING YOUR VEHICLE 423

ABS (Anti-Lock Brake System)............203,316
Adding Fuel ........................... 361
Air Cleaner, Engine (Engine Air Cleaner Filter) . . . 409
Air Conditioner Maintenance ............... 410
Air Conditioning ..................... 266,269
Air Conditioning Controls ................. 269
Air Conditioning, Operating Tips ............ 270
Air Conditioning Refrigerant ................ 411
Air Conditioning System .................. 269
Air Filter .............................. 409
Air Pressure, Tires ....................... 343
Airbag ................................ 48
Airbag Deployment ....................... 56
Airbag Light ....................... 58,76,204
Airbag Maintenance ....................... 58
Airbag, Side ............................ 55
Alarm Light ........................... 204
Alarm (Security Alarm) .................... 17
Alterations/Modifications, Vehicle ............. 8Antenna, Satellite Radio
................... 259
Antifreeze (Engine Coolant) ................ 447
Anti-Lock Brake System (ABS) ............316,319
Anti-Lock Warning Light .................. 203
Appearance Care ........................ 428
Arming Theft System (Security Alarm) ......... 18
Auto Down Power Windows ................ 36
Automatic Transmission ................... 423
Fluid and Filter Changes ................. 423
Fluid Level Check ..................... 424
Fluid Type ........................... 423
Gear Ranges ......................... 288
Shifting ............................. 287
Special Additives ...................... 425
Torque Converter ...................... 291
Auxiliary Electrical Outlet (Power Outlet) ...... 106
Auxiliary Power Outlet ................... 106
Axle Lock .......................... 296,297
482 INDEX

Exterior.............................. 76
Fog .............................. 96,445
Hazard Warning Flasher ................. 388
Headlight Switch ....................... 95
Headlights ........................... 444
High Beam .......................... 201
High Beam Indicator .................... 201
Instrument Cluster ...................... 95
Interior .............................. 97
Lights On Reminder ..................... 95
Low Fuel ............................ 200
Oil Pressure .......................... 201
Passing .............................. 96
Rear Servicing ........................ 446
Rear Tail ............................ 446
Seat Belt Reminder ..................... 201
Security Alarm (Theft Alarm) .............. 204
Service ............................. 444
Side Marker .......................... 446 Theft Alarm (Security Alarm)
.............. 204
Tire Pressure Monitoring (TPMS) ........... 206
Traction Control ....................... 211
Turn Signal ................. 76,96,201,445,446
Voltage ............................. 200
Warning (Instrument Cluster Description) ..... 200
Loading Vehicle ......................... 363
Tires ............................... 338
Locking Axle ........................ 296,297
Locks Door ................................ 30
Power Door ........................... 32
Steering Wheel ......................... 13
Lower Anchors and Tether for CHildren
(LATCH) ............................ 66,68
Lubrication, Body ....................... 411
Maintenance Free Battery .................. 409
Maintenance Procedures ................... 405
490 INDEX