2003 GMC SIERRA DENALI fuel

Inflation - Tire Pressure
The CertificationKire label, which is on the rear edge of
the driver’s door, shows the correct inflation pressures
for your tires when they’re cold. “Cold” means your
vehicle has been sitting for at least three hours or driven
no more than
1 mile (1.6 km).
Notice: Don’t let anyone tell you that underinflation
or overinflation is all right. It’s not. If your tires
don’t have enough air (underinflation), you can get
the following:
Too much flexing
Too much heat
Tire overloading
Bad wear
Bad handling
Bad fuel economy
If your tires have too much air (overinflation), you
can get the following:
Unusual wear
Bad handling
Rough ride
Needless damage from road hazards
5-62
When to Check
Check your tires once a month or more.
Also, check the tire pressure of the spare tire
How to Check
Use a good quality pocket-type gage to check tire
pressure. You can’t tell
if your tires are properly inflated
simply by looking at them. Radial tires may look
properly inflated even when they’re underinflated.
Be sure to put the valve caps back on the valve stems.
They help prevent leaks by keeping out dirt and
moisture.
Tire Inspection and Rotation
Tires should be rotated every 7,500 miles (12,500 km).
Any time you notice unusual wear, rotate your tires
as soon as possible and check wheel alignment.
Also
check for damaged tires or wheels. See When It Is Time
for New Tires on page 5-64 and Wheel Replacement
on page
5-67 for more information.
Make sure the spare tire
is stored securely. Push, pull,
and then try to rotate
or turn the tire. If it moves,
use the wheel wrench and jack handle extensions to
tighten the cable. See
Changing a Flat Tire on
page
5-69.

Sheet Metal Damage
If your vehicle is damaged and requires sheet metal
repair or replacement, make sure the body repair shop
applies anti-corrosion material to parts repaired
or
replaced to restore corrosion protection.
Original manufacturer replacement parts will provide the
corrosion protection while maintaining the warranty.
Finish Damage
Any stone chips, fractures or deep scratches in the
finish should be repaired right away. Bare metal
will corrode quickly and may develop into major repair
expense.
Minor chips and scratches can be repaired with touch-up
materials avaliable from your dealer or other service
outlets. Larger areas of finish damage can be corrected
in your dealer’s body and paint shop.
Underbody Maintenance
Chemicals used for ice and snow removal and dust
control can collect on the underbody.
If these are not
removed, accelerated corrosion (rust) can occur on
the underbody parts such as fuel lines, frame, floor pan
and exhaust system even though they have corrosion
protection. At
least every spring, flush these materials from the
underbody with plain water. Clean any areas where mud
and debris can collect. Dirt packed in close areas of
the frame should be loosened before being flushed.
Your dealer or an underbody car washing system can
do this for you.
Chemical Paint Spotting
Some weather and atmospheric conditions can create a
chemical fallout. Airborne pollutants can fall upon and
attack painted surfaces on your vehicle. This damage
can take two forms; blotchy, ringlet-shaped
discolorations, and small irregular dark spots etched into
the paint surface.
Although no defect in the paint job causes this,
GM will
repair, at no charge to the owner, the surfaces of
new vehicles damaged by this fallout condition within
12 months or 12,000 miles (20 000 km) of purchase,
whichever occurs first.
5-91

Replace cover after servicing. Remettre le couvercle en place.
I ? i I I I I I
I
I I I
I
I I I L I 1 I I L
B+
GLOW I PLUG
OR I
I CUST I FEED I I -_--l
NOTE: The function and FUNCTION/AMy-GAS
amperage of these fuses FONCTION/INTENSIT!-ESSENCE FONCTIONIINTENSITE-DIESEL ces fusibles sont diffbrentes pour les
FUNCTION/AMP-QlESEL * REMARQUE: La fonction
et I'intensitk de
are different for gas and INJ 2/15A EDU/25A moteurs essence et les rnoteurs diesel.
diesel fueled engines. See
Owners Manual for
functions
of studs #I and #2. ECMV15A f
tCMRPV/I5A
FUEL HT/15A Voir le Guide du propri6taire a pour
les fonctions des plots 1 et 2.
5- 1 00

*I - Gasoline Engine and Diesel Engine.
*2 - Gasoline Engine; ECMRPV - Diesel Engine.
*3 - Gasoline Engine; FUEL HT - Diesel Engine.
*4 - Gasoline Engine; ECM f - Diesel Engine.
*5 - IGN/EDU
r Fuses
GLOW PLUG
CUST FEED
STUD
#I
MBEC
BLOWER
LBEC Only)/ Dual Battery
(TP2)
Do not install fuse.
Mid Bussed Electrical Center
Power Feed, Front Seats,
Riaht Doors TRL
PARK Parking Lamps Trailer Wiring
RR PARK Right
Rear Parking and
Sidemarker LamDs
TBC BATT Truck Body
Controller Battery
I Feed
5-1 01

Fuses Usage
4WS Canister/QUADRASTEERTM
RR HVAC Not Used
Vent
Solenoid
Module Power
AUX PWR IGN
1 Ignition Relay
PCM
1
Auxiliary Power
Outlet
- Console
Electronic Throttle Control,
IGN E
Rday
RTD Ride Control
TRL B/U
PCM B
~~ ~-
Backup Lamps Trailer Wiring
Powertrain Control Module,
Fuel Pump
-. - . . -. . . .
F/PM P
B/U LP Transmission Shift Lock
r
Fuel Pump (Relay)
Back-up Lamps, Automatic
Control System
RR DEFOG Rear Window Defogger SIR
FRT PARK
DRL Daytime Running Lamps
I (Relav)
SEO IGN
TBC IGNI Truck Body Controller Ignition \~ ------I
Rear Defog Relay
HI HDLP-LT High Beam Headlamp-Left
LH HID Not Used
DRL Daytime Running Lamps
IPC/DIC Instrument
Panel
Cluster/Driver Information Center
5-1 02

Capacities and Specifications
Capacities and Specifications
Capacities
Application
All capacities are approximate. When adding, be sure to
fill to the approximate level, as recommended in this
Use
Refrigerant Oil, R134a Systems 0.8
kg
1.76 Ibs.
Air Conditioning Refrigerant R134a 98.4
L 26.0 gallons
Fuel
Tank 5.7
L 6.0 quarts
Engine Oil
with Filter 14.0
L 14.8 quarts
Cooling
System Metric
English
manual. See
Part D: Recommended Fluids and Lubricants on page 6-16.
Engine Specifications
Engine Spark Plug Gap
Type
VIN Code
VORTEC 6000
0.060 inches (1.52 mm) V8
U
Wheels and Tires
Wheel Nut Torque
See the CertificationKire label on the rear edge of the
Tire
Pressure 140 Ib ft (190 N*m )
driver’s door.
5-1 04

Section 6 Maintenance Schedule
Maintenance Schedule ...................................... 6.2
introduction
................................................... 6.2
Your Vehicle and the Environment
.................... 6-2
Maintenance Requirements
.............................. 6-2
How This Section is Organized
......................... 6-3
Part A: Scheduled Maintenance Services
........... 6-4
Using Your Maintenance Schedule
.................... 6-4
Scheduled Maintenance
................................... 6-5
Part
B: Owner Checks and Services ................ 6-10
At Each Fuel Fill
.......................................... 6-10
At Least Once a Month
................ ......... 6-10
At Least Twice a Year
............................... 6-11 At Least
Once a Year
................................... 6-11
Part
C: Periodic Maintenance Inspections ......... 6.14
Steering and Suspension Inspection
................ 6.14
Exhaust System inspection
............................ 6-14
Fuel System Inspection
.................................. 6.14
Engine Cooling System inspection
................... 6.14
(All-Wheel Drive) Inspection
........................ 6.15
Brake System Inspection
................................ 6.15
Part
D: Recommended Fluids and Lubricants .... 6-16
Part E: Maintenance Record
........................... 6.18
Transfer Case and
Front Axle
6- 1

Part A: Scheduled Maintenance
Services
This part contains engine oil and chassis lubrication scheduled maintenance which explains the engine oil life
system and how it indicates when to change the
engine oil and filter. Lubricate chassis components with
each oil change.
Also, listed are scheduled maintenance
services which are to be performed at the mileage
intervals specified.
Using Your Maintenance Schedule
We at General Motors want to help you keep your
vehicle in good condition. But we don’t know exactly how
you’ll drive it. You may drive very short distances only
a few times a week. Or you may drive long distances in
very hot, dusty weather. You may use your vehicle in
making deliveries. Or yo may drive
it to work, to
do errands or in many other ways.
Because
of all the different ways people use their
vehicles, maintenance needs vary. You may need more
frequent checks and replacements.
So please read
the following and note how you drive.
If you have any
questions on how to keep your vehicle in good condition,
see your dealer. This part tells
you the maintenance services you should
have done and when you should schedule them.
When you go to your dealer for your service needs,
you’ll know that GM-trained and supported service
people will perform the work using genuine
GM parts.
The proper fluids and lubricants
so use are listed in Part
D. Make sure whoever services your vehicle uses
these.
All parts should be replaced and all necessary
repairs done before you or anyone else drives the
vehicle.
This schedule is for vehicles that:
carry passengers and cargo within recommended
limits. You will find these limits on your vehicle’s
Certification/Tire label. See
Loading Your Vehicle on
page 4-45.
are driven on reasonable road surfaces within legal
driving limits.
are driven off-road in the recommended manner.
See
Operating Your All- Wheel-Drive Vehicle Off
Paved Roads on page 4- 16.
use the recommended fuel. See Gasoline Octane
on page 5-5.
6-4