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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.
Loose Fuel Filler Cap Message
If the vehicle diagnostic system determines that the fuel
filler cap is loose, improperly installed, or damaged, the
word “gASCAP” will display in the odometer. If this
occurs, tighten the fuel filler cap until a “clicking” sound
is heard and press the TRIP ODOMETER button to turn
off the message. If the problem persists, the message will
appear the next time the vehicle is started.
7
MAINTAINING YOUR VEHICLE 561
Page 591 of 664

4. Place the shift lever momentarily into each gear posi-tion (allowing time for the transmission to fully en-
gage in each position), ending with the transmission in
PARK.
5. Wipe the area around the dipstick clean to prevent dirt from entering the transmission.
6. Remove the dipstick and determine if the fluid is hot or cold. You can also read the transmission fluid
temperature using the Vehicle Information display in
the Electronic Vehicle Information Center (EVIC) in
the instrument cluster. Refer to Electronic Vehicle
Information Center (EVIC) inUnderstanding Your
Instrument Panel for further information. Hot fluid is
approximately 180°F (82°C), which is the normal op-
erating temperature after the vehicle is driven at least
15 miles (24 km). Hot fluid cannot be held comfortably
between the fingertips. Cold fluid is at a temperature
of approximately 80°F (27°C). 7. Wipe the dipstick clean and reinsert it until seated.
Then, remove the dipstick and note the fluid level on
both sides. The fluid level reading is only valid if there
is a solid coating of oil on both sides of the dipstick.
Note that the holes in the dipstick will be full of fluid
if the actual level is at or above the hole.
• If the fluid is hot, the fluid level should be in the
crosshatched area marked “HOT” (between the up-
per two holes in the dipstick).
• If the fluid is cold, the fluid level should be between
the lower two holes in the area marked “COLD”.
If the fluid level is low, add fluid through the dipstick
tube to bring it to the proper level. Do not overfill. After
adding any quantity of oil through the dipstick tube, wait
at least two minutes for the oil to fully drain into the
transmission before rechecking the fluid level.
7
MAINTAINING YOUR VEHICLE 589
Page 622 of 664

MAINTENANCE SCHEDULE
Your vehicle is equipped with an automatic oil change
indicator system. The oil change indicator system will
remind you that it is time to take your vehicle in for
scheduled maintenance.
Based on engine operation conditions, the oil change
indicator message will illuminate. This means that ser-
vice is required for your vehicle. Operating conditions
such as frequent short-trips, trailer tow, extremely hot or
cold ambient temperatures, and E85 fuel usage will
influence when the “Change Oil” or “Oil Change Re-
quired” message is displayed. Severe Operating Condi-
tions can cause the change oil message to illuminate as
early as 3,500 miles (5,600 km) since last reset. Have your
vehicle serviced as soon as possible, within the next 500
miles (805 km).
Your authorized dealer will reset the oil change indicator
message after completing the scheduled oil change. If ascheduled oil change is performed by someone other
than your authorized dealer, the message can be reset by
referring to the steps described under “Electronic Vehicle
Information Center (EVIC)” in “Understanding Your
Instrument Panel” for further information.
NOTE:
Under no circumstances should oil change inter-
vals exceed 10,000 miles (16,000 km), twelve months or
350 hours of engine run time, whichever comes first. The
350 hours of engine run or idle time is generally only a
concern for fleet customers.
Severe Duty All Models
Change Engine Oil at 4,000 miles (6,500 km) if the vehicle
is operated in a dusty and off road environment or is
operated predominately at idle or only very low engine
RPM’s. This type of vehicle use is considered Severe Duty.
620 MAINTENANCE SCHEDULES
Page 645 of 664

Remote Keyless Entry (RKE)................30
Door Locks, Automatic ......................32
Door Opener, Garage ...................... .255
Driving Through Flowing, Rising, Or Shallow Standing
Water ............................... .442
Driving To Achieve Maximum Fuel Economy .....332
DVD Player (Video Entertainment System) .......363
E-85 Fuel .............................. .502
Electrical Outlet, Auxiliary (Power Outlet) ........268
Electrical Power Outlets .....................268
Electric Remote Mirrors .....................121
Electronic Brake Control System ...............450
Anti-Lock Brake System ..................450
Electronic Roll Mitigation .................462
Traction Control System ...................456
Electronic Speed Control (Cruise Control) ........238
Electronic Stability Control (ESC) ..............457Electronic Throttle Control Warning Light
........311
Electronic Vehicle Information Center Instrument Cluster Display .................29
Electronic Vehicle Information Center (EVIC) ......327
Remote Start ...........................29
Emergency, In Case Of Freeing Vehicle When Stuck ................550
Hazard Warning Flasher ..................529
Jacking .............................. .532
Jump Starting ......................... .546
Overheating .......................... .529
Towing ............................. .552
Emission Control System Maintenance ..........562
Engine ................................ .559
Air Cleaner .......................... .569
Block Heater ......................... .429
Break-In Recommendations ................106
Checking Oil Level ..................... .565
Compartment ...................... .559, 560
10
INDEX 643