2007 GMC YUKON XL DENALI fuel pressure

Accordingly, when the low tire pressure telltale
illuminates, you should stop and check your tires
as soon as possible, and inate them to the
proper pressure. Driving on a signicantly
under-inated tire causes the tire to overheat and
can lead to tire failure. Under-ination also
reduces fuel efficiency and tire tread life, and may
affect the vehicle’s handling and stopping ability.
Please note that the TPMS is not a substitute
for proper tire maintenance, and it is the driver’s
responsibility to maintain correct tire pressure,
even if under-ination has not reached the level to
trigger illumination of the TPMS low tire pressure
telltale.
Your vehicle has also been equipped with a
TPMS malfunction indicator to indicate when the
system is not operating properly. The TPMS
malfunction indicator is combined with the low tire
pressure telltale. When the system detects a
malfunction, the telltale will ash for approximately
one minute and then remain continuously
illuminated. This sequence will continue upon
subsequent vehicle start-ups as long as the
malfunction exists.When the malfunction indicator is illuminated, the
system may not be able to detect or signal low
tire pressure as intended. TPMS malfunctions may
occur for a variety of reasons, including the
installation of replacement or alternate tires or
wheels on the vehicle that prevent the TPMS from
functioning properly. Always check the TPMS
malfunction telltale after replacing one or more
tires or wheels on your vehicle to ensure that the
replacement or alternate tires and wheels allow
the TPMS to continue to function properly.
The CHECK TIRE PRESSURE warning message
and low tire pressure light (telltale) will come
on each time the vehicle is started until the tires
are inated to the correct ination pressure.
The Tire and Loading Information label (tire
information placard) shows the size of your
vehicle’s original tires and the correct ination
pressure for your vehicle’s tires when they
are cold. SeeInation - Tire Pressure on
page 488. For the location of the tire and loading
information label, seeLoading Your Vehicle
on page 392.
492

(b)Visually inspect front and rear suspension and
steering system for damaged, loose, or missing
parts, signs of wear, or lack of lubrication. Inspect
power steering lines and hoses for proper
hook-up, binding, leaks, cracks, chang, etc.
Visually check constant velocity joints, rubber
boots, and axle seals for leaks.
(c)Visually inspect hoses and have them replaced
if they are cracked, swollen, or deteriorated.
Inspect all pipes, ttings, and clamps; replace with
genuine GM parts as needed. To help ensure
proper operation, a pressure test of the cooling
system and pressure cap and cleaning the outside
of the radiator and air conditioning condenser is
recommended at least once a year.
(d)Visually inspect wiper blades for wear or
cracking. Replace wiper blades that appear worn
or damaged or that streak or miss areas of
the windshield.(e)Make sure the safety belt reminder light and all
your belts, buckles, latch plates, retractors, and
anchorages are working properly. Look for
any other loose or damaged safety belt system
parts. If you see anything that might keep a safety
belt system from doing its job, have it repaired.
Have any torn or frayed safety belts replaced. Also
look for any opened or broken airbag coverings,
and have them repaired or replaced. The
airbag system does not need regular maintenance.
(f)Lubricate all key lock cylinders, hood latch
assembly, secondary latch, pivots, spring anchor,
release pawl, door hinges, liftgate hinge, liftgate
linkage, liftgate handle pivot points, latch bolt, fuel
door hinge, locks, and folding seat hardware.
More frequent lubrication may be required when
exposed to a corrosive environment. Applying
silicone grease on weatherstrips with a clean cloth
will make them last longer, seal better, and not
stick or squeak.
556

(g)Inspect system. Check all fuel and vapor
lines and hoses for proper hook-up, routing, and
condition. Check that the purge valve works
properly, if equipped. Replace as needed.
(h)Change automatic transmission uid and lter
if the vehicle is mainly driven under one or
more of these conditions:
In heavy city traffic where the outside
temperature regularly reaches 90°F (32°C)
or higher.
In hilly or mountainous terrain.
When doing frequent trailer towing.
Uses such as found in taxi, police, or delivery
service.
(i)Drain, ush, and rell cooling system. This
service can be complex; you should have
your dealer perform this service. See Engine
Coolant on page 445 for what to use. Inspect
hoses. Clean radiator, condenser, pressure
cap, and ller neck. Pressure test the cooling
system and pressure cap.(j)A uid loss in any vehicle system could indicate
a problem. Have the system inspected and
repaired and the uid level checked. Add uid if
needed.
(k)If you drive regularly under dusty conditions,
inspect the lter at each engine oil change.
(l)Visually inspect belt for fraying, excessive
cracks, or obvious damage. Replace belt if
necessary.
(m)Check vent hose at transfer case for kinks
and proper installation.
Owner Checks and Services
These owner checks and services should be
performed at the intervals specied to help
ensure the safety, dependability, and emission
control performance of your vehicle. Your
GM Goodwrench
®dealer can assist you with
these checks and services.
Be sure any necessary repairs are completed at
once. Whenever any uids or lubricants are added
to your vehicle, make sure they are the proper
ones, as shown inRecommended Fluids and
Lubricants on page 561.
557

At Each Fuel Fill
It is important to perform these underhood checks
at each fuel ll.
Engine Oil Level Check
Check the engine oil level and add the proper
oil if necessary. SeeEngine Oil on page 432for
further details.
Notice:It is important to check your oil
regularly and keep it at the proper level. Failure
to keep your engine oil at the proper level
can cause damage to your engine not covered
by your warranty.
Engine Coolant Level Check
Check the engine coolant level and add
DEX-COOL®coolant mixture if necessary. See
Engine Coolant on page 445for further details.
Windshield Washer Fluid Level Check
Check the windshield washer uid level in
the windshield washer uid reservoir and add the
proper uid if necessary.
At Least Once a Month
Tire Ination Check
Visually inspect your vehicle’s tires and make sure
they are inated to the correct pressures. Do
not forget to check the spare tire. SeeTires on
page 480for further details. Check to make
sure the spare tire is stored securely. See
Changing a Flat Tire on page 506.
Tire Wear Inspection
Tire rotation may be required for high mileage
highway drivers prior to the Engine Oil Life System
service notication. Check the tires for wear
and, if necessary, rotate the tires. SeeTire
Inspection and Rotation on page 496.
558

Fuel (cont.)
Gasoline Specications............................ 424
Low Warning Light................................... 244
Fuses
Center Instrument Panel Fuse Block........ 540
Fuses and Circuit Breakers...................... 538
Instrument Panel Fuse Block................... 538
Underhood Fuse Block............................. 541
Windshield Wiper..................................... 537
G
Gage
Engine Coolant Temperature.................... 236
Fuel......................................................... 243
Oil Pressure............................................. 240
Speedometer........................................... 227
Tachometer.............................................. 227
Voltmeter Gage........................................ 232
Garage Door Opener..........................166, 167
Gasoline
Octane..................................................... 423
Specications........................................... 424
Glove Box................................................... 178
GM Mobility Reimbursement Program.......... 575
H
Hazard Warning Flashers............................ 192
Head Restraints............................................ 16
Headlamp
Aiming..................................................... 473
Headlamps
Automatic Headlamp System.................... 205
Bulb Replacement.................................... 476
Daytime Running Lamps.......................... 205
Flash-to-Pass........................................... 195
Halogen Bulbs......................................... 476
High/Low Beam Changer......................... 195
On Reminder........................................... 205
Heated Seats................................................ 11
Heater......................................................... 214
Highbeam On Light..................................... 242
High-Speed Operation, Tires........................ 490
Highway Hypnosis....................................... 383
Hill and Mountain Roads............................. 384
Hood
Checking Things Under............................ 428
Release................................................... 429
Horn............................................................ 192
How to Use This Manual................................ 3
How to Wear Safety Belts Properly............... 43
599

I
Ignition Positions......................................... 140
Infants and Young Children, Restraints.......... 64
Ination - Tire Pressure............................... 488
Instrument Panel
Overview.................................................. 190
Storage Area............................................ 178
Instrument Panel (I/P)
Brightness................................................ 207
Cluster..................................................... 226
J
Jump Starting.............................................. 464
K
Keyless Entry System................................. 114
Keys........................................................... 113
L
Labeling, Tire Sidewall................................. 482
Lamps
Battery Run-Down Protection................... 208
Dome....................................................... 207Lamps (cont.)
Dome Lamp Override............................... 207
Exterior.................................................... 203
Fog .......................................................... 206
Front Reading.......................................... 208
LATCH System
Child Restraints......................................... 74
Level Control............................................... 399
License Plate Lamps................................... 477
Liftgate, Power............................................ 128
Liftgate/Liftglass........................................... 126
Liftglass/Liftgate........................................... 126
Light
Airbag Readiness..................................... 229
Anti-Lock Brake System Warning............. 234
Brake System Warning............................. 233
Charging System..................................... 232
Cruise Control.......................................... 242
Fog Lamp................................................ 242
Highbeam On.......................................... 242
Low Fuel Warning.................................... 244
Malfunction Indicator................................ 237
Oil Pressure............................................. 241
Passenger Airbag Status Indicator............ 230
Passenger Safety Belt Reminder.............. 228
Safety Belt Reminder............................... 228
Security................................................... 241
600

Light (cont.)
StabiliTrak®Indicator................................ 235
Tire Pressure........................................... 236
Tow/Haul Mode........................................ 242
Lighting
Entry........................................................ 207
Exit.......................................................... 207
Loading Your Vehicle................................... 392
Locking Differential...................................... 349
Lockout Protection....................................... 125
Locks
Delayed Locking...................................... 123
Door........................................................ 122
Lockout Protection................................... 125
Power Door............................................. 123
Programmable Automatic Door Locks....... 124
Rear Door Security Locks........................ 124
Loss of Control........................................... 357
Low Fuel Warning Light............................... 244
Luggage Carrier.......................................... 179
Lumbar
Power Controls.......................................... 10M
Maintenance Schedule
Additional Required Services.................... 554
At Each Fuel Fill...................................... 558
At Least Once a Month............................ 558
At Least Once a Year.............................. 559
Introduction.............................................. 548
Maintenance Footnotes............................ 555
Maintenance Record................................ 565
Maintenance Requirements...................... 548
Normal Maintenance Replacement Parts ... 563
Owner Checks and Services.................... 557
Recommended Fluids and Lubricants....... 561
Scheduled Maintenance........................... 551
Using....................................................... 549
Your Vehicle and the Environment............ 549
Malfunction Indicator Light........................... 237
Memory Seat, Mirrors, and Pedals................ 12
Message
DIC Warnings and Messages................... 252
Mirrors
Automatic Dimming Rearview with
OnStar
®, Compass and Temperature
Display................................................. 158
Outside Power Foldaway Mirrors.............. 161
MyGMLink.com............................................ 573
601