ECU CHEVROLET SILVERADO 2004 1.G Repair Manual

Coolant Surge Tank Pressure Cap
SeeEngine Compartment
Overview on page 5-14
for more information
on location.
The coolant surge tank pressure cap must be fully
installed on the coolant surge tank.
Notice:If the pressure cap is not tightly
installed, coolant loss and possible engine
damage may occur. Be sure the cap is properly
and tightly secured.
Engine Overheating
You will nd a coolant temperature gage on your
vehicle’s instrument panel. SeeEngine Coolant
Temperature Gage on page 3-46. In addition, you will
nd a ENGINE OVERHEATED and a REDUCED
ENGINE POWER message in the Driver Information
Center on the instrument panel. SeeDriver Information
Center (DIC) on page 3-53.
Overheated Engine Protection
Operating Mode (V8 Engines Only)
If an overheated engine condition exists and the
REDUCED ENGINE POWER message is displayed, an
overheat protection mode which alternates ring
groups of cylinders helps prevent engine damage. In
this mode, you will notice a loss in power and engine
performance. This operating mode allows your vehicle to
be driven to a safe place in an emergency. Driving
extended miles (km) and/or towing a trailer in the
overheat protection mode should be avoided.
Notice:After driving in the overheated engine
protection operating mode, to avoid engine damage,
allow the engine to cool before attempting any repair.
The engine oil will be severely degraded. Repair the
cause of coolant loss, change the oil and reset the oil
life system. SeeEngine Oil on page 5-20.
5-38

Dual Tire Operation
When the vehicle is new, or whenever a wheel, wheel
bolt or wheel nut is replaced, check the wheel nut torque
after 100, 1,000 and 6,000 miles (160, 1 600 and
10 000 km) of driving. For proper torque and wheel nut
tightening information, see “Removing the Flat Tire
and Installing the Spare Tire” in the index.
The outer tire on a dual wheel setup generally wears
faster than the inner tire. Your tires will wear more
evenly and last longer if you rotate the tires periodically.
See “Tire Inspection and Rotation” earlier in this
section. Also see “Scheduled Maintenance Services” in
the Index for scheduled rotation intervals
{CAUTION:
If you operate your vehicle with a tire that is
badly underinated, the tire can overheat. An
overheated tire can lose air suddenly or catch
re. You or others could be injured. Be sure all
tires (including the spare) are properly inated.
See “Tires” and “Ination – Tire Pressure” in the Index
for more information on proper tire ination.
Tire Inspection and Rotation
Tires should be rotated every 5,000 to 8,000 miles
(8 000 to 13 000 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. SeeWhen It Is Time
for New Tires on page 5-86andWheel Replacement
on page 5-89for 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/hoist shaft to tighten the cable.
SeeChanging a Flat Tire on page 5-93.
If your vehicle has dual rear wheels, also seeDual Tire
Operation on page 5-83.
The purpose of regular rotation is to achieve more
uniform wear for all tires on the vehicle. The rst rotation
is the most important. SeeScheduled Maintenance
on page 6-4, for scheduled rotation intervals.
5-83

Tire Chains
{CAUTION:
If your vehicle has dual wheels or P265/75R16,
LT265/75R16, P265/70R17 or P275/55R20 size
tires, don’t use tire chains. They can damage
your vehicle because there’s not enough
clearance. Tire chains used on a vehicle
without the proper amount of clearance can
cause damage to the brakes, suspension or
other vehicle parts. The area damaged by the
tire chains could cause you to lose control of
your vehicle and you or others may be injured
in a crash.
Use another type of traction device only if its
manufacturer recommends it for use on your
vehicle and tire size combination and road
conditions. Follow that manufacturer’s
CAUTION: (Continued)
CAUTION: (Continued)
instructions. To help avoid damage to your
vehicle, drive slowly, readjust or remove the
device if it’s contacting your vehicle, and don’t
spin your wheels.
If you do nd traction devices that will t,
install them on the rear tires.
Notice:If your vehicle does not have dual wheels
and is equipped with a tire size other than
P265/75R16, LT265/75R16, P265/70R17 or
P275/55R20, use tire chains only where legal and
only when you must. Use chains that are the proper
size for your tires. Install them on the tires of the
rear axle. Don’t use chains on the tires of the front
axle. Tighten them as tightly as possible with
the ends securely fastened. Drive slowly and follow
the chain manufacturer’s instructions. If you can
hear the chains contacting your vehicle, stop
and retighten them. If the contact continues, slow
down until it stops. Driving too fast or spinning the
wheels with chains on will damage your vehicle.
5-91

4. Make sure the jack head is positioned so that the
rear axle is resting securely between the grooves
that are on the jack head. Turn the wheel
wrench clockwise to raise the vehicle. Raise the
vehicle far enough off the ground so there is enough
room for the spare tire to t under the wheel well.5. Remove all the wheel
nuts and take off the
at tire.
6. Remove any rust or dirt
from the wheel bolts,
mounting surfaces
and spare wheel. Rear Position
5-102

4. Insert the hoist end (F)
through the hole (G) in
the rear bumper and
into the hoist shaft.
5. Raise the tire part way upward. Make sure the
retainer is seated in the wheel opening.
6. Raise the tire fully against the underside of the
vehicle by turning the wheel wrench clockwise
until you hear two clicks or feel it skip twice.
You cannot overtighten the cable.A. Push and Pull
B. Turn Tire
7. Make sure the tire is stored securely. Push, pull,
and then try to turn the tire. If the tire moves, use
the wheel wrench to tighten the cable. Reinstall the
spare tire lock (if equipped).
5-109

4. Repeat this procedure at least two times. If the
spare tire lowers to the ground, continue with
Step 5 of “Removing the Spare Tire and Tools”
earlier in this section.
5. Turn the wrench counterclockwise until
approximately six inches (15 cm) of cable
is exposed.
6. Stand the wheel blocks
on their shortest ends,
with the backs
facing each other.
7. Place the bottom edge of the jack on the wheel
blocks, separating them so that the jack is
balanced securely.
5-111

At the First 100, 1,000 and 6,000
Miles (160, 1 600 and 10 000km)
Check dual wheel nut torque. For proper torque, see
Capacities and Specications on page 5-132.
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 5-20for
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. SeeEngine
Coolant on page 5-35for further details.
Windshield Washer Fluid Level Check
Check the windshield washer uid level in the windshield
washer tank and add the proper uid if necessary.
At Least Once a Month
Tire Ination Check
Visually inspect your tires and make sure tires are
inated to the correct pressures. Do not forget to check
your spare tire. SeeTires on page 5-74for further
details. Check to make sure the spare tire is stored
securely. Push, pull and then try to rotate or turn
the spare tire. If it moves, tighten it. SeeChanging a
Flat Tire on page 5-93.
6-10

Roadside Assistance Program
Security While You Travel
1-800-CHEV-USA (243-8872)
As the proud owner of a new Chevrolet vehicle, you are
automatically enrolled in the Chevrolet Roadside
Assistance program. This value-added service is
intended to provide you with peace of mind as you drive
in the city or travel the open road. Chevrolet’s Roadside
Assistance toll-free number is staffed by courteous
and capable Roadside Assistance Representatives who
are available 24 hours a day, 365 days a year.
We will provide the following services during the
Bumper-to-Bumper warranty period, at no expense
to you:
Fuel Delivery:Delivery of enough fuel
($5 maximum) for the customer to get to the
nearest service station.
Lock-out Service (identication required):
Replacement keys or locksmith service will
be covered at no charge if you are unable to gain
entry into your vehicle. Delivery of the replacement
key will be covered within 10 miles.
Emergency Tow:Tow to the nearest dealership
for warranty service or in the event of a
vehicle-disabling accident. Assistance when
the vehicle is mired in sand, mud or snow.
Flat Tire Change:Installation of a spare tire will be
covered at no charge. (The customer is responsible
for the repair or replacement of the tire if not
covered by a warrantable failure.)
Jump Start:No-start occurrences which require a
battery jump start will be covered at no charge.
Dealer Locator Service
In many instances, mechanical failures are covered
under Chevrolet’s Bumper-to-Bumper warranty.
However, when other services are utilized, our Roadside
Assistance Representatives will explain any payment
obligations you might incur.
7-6

For prompt and efficient assistance when calling, please
provide the following to the Roadside Assistance
Representative:
Your name, home address, and home
telephone number
Telephone number of your location
Location of the vehicle
Model, year, color, and license plate number
Mileage, Vehicle Identication Number and delivery
date of the vehicle
Description of the problem
While we hope you never have the occasion to use our
service, it is added security while traveling for you
and your family. Remember, we are only a phone
call away. Chevrolet Roadside Assistance:
1-800-CHEV-USA (1-800-234-8872), text
telephone (TTY) users, call 1-888-889-2438.
Chevrolet reserves the right to limit services or
reimbursement to an owner or driver when, in
Chevrolet’s judgement, the claims become excessive in
frequency or type of occurrence.
Roadside Assistance is not part of or included in the
coverage provided by the New Vehicle Limited Warranty.
Chevrolet reserves the right to make any changes or
discontinue the Roadside Assistance program at
any time without notication.
Canadian Roadside Assistance
Vehicles purchased in Canada have an extensive
roadside assistance program accessible from anywhere
in Canada or the United States. Please refer to the
Warranty and Owner Assistance Information book.
Courtesy Transportation
Chevrolet has always exemplied quality and value in
its offering of motor vehicles. To enhance your
ownership experience, we and our participating dealers
are proud to offer Courtesy Transportation, a customer
support program for new vehicles.
The Courtesy Transportation program is offered to retail
purchase/lease customers in conjunction with the
Bumper-to-Bumper coverage provided by the New
Vehicle Limited Warranty. Several transportation
options are available when warranty repairs are
required. This will reduce your inconvenience during
warranty repairs.
Plan Ahead When Possible
When your vehicle requires warranty service, you
should contact your dealer and request an appointment.
By scheduling a service appointment and advising
your service consultant of your transportation needs,
your dealer can help minimize your inconvenience.
7-7

C
California Fuel.................................................. 5-6
Canada – Customer Assistance.......................... 7-5
Canadian Owners................................................ ii
Canadian Roadside Assistance........................... 7-7
Capacities and Specications..........................5-132
Car Washes for QUADRASTEER™
Equipped Vehicles.......................................4-17
Carbon Monoxide...................2-15, 2-53, 4-46, 4-70
Care of
Safety Belts..............................................5-117
Your Cassette Tape Player..........................3-129
Your CD and DVD Player...........................3-130
Your CDs and DVDs..................................3-130
Cargo Lamp...................................................3-17
CARGO LAMP ON.........................................3-65
Cassette Tape Messages.................................3-97
CD Adapter Kits.............................................3-97
CD Messages...............................3-86, 3-99, 3-113
Center Console Storage Area...........................2-68
Center High-Mounted Stoplamp (CHMSL) and
Cargo Lamp...............................................5-68
Center Instrument Panel Fuse Block................5-126
Center Passenger Position, Safety Belts.............1-24
Chains, Tires..................................................5-91
CHANGE ENGINE OIL....................................3-66
Check Engine Light.........................................3-48
CHECK OIL LEVEL.........................................3-65CHECK WASHER FLUID.................................3-65
Checking Brake Fluid......................................5-50
Checking Coolant............................................5-36
Checking Engine Oil........................................5-20
Checking Things Under the Hood......................5-12
Chemical Paint Spotting.................................5-120
Child Restraints
Child Restraint Systems...............................1-38
Infants and Young Children...........................1-34
Lower Anchorages and Top Tethers for
Children (LATCH System)..........................1-47
Older Children.............................................1-32
Securing a Child Restraint Designed for the
LATCH System................................1-48, 1-49
Securing a Child Restraint in a Center Rear
Seat Position...........................................1-56
Securing a Child Restraint in a Rear Outside
Seat Position...........................................1-53
Securing a Child Restraint in the Center Front
Seat Position...........................................1-58
Securing a Child Restraint in the Right Front
Seat Position (Crew Cab)..........................1-58
Securing a Child Restraint in the Right
Front Seat Position (Regular and
Extended Cab).........................................1-61
Top Strap...................................................1-42
Top Strap Anchor Location............................1-43
Where to Put the Restraint...........................1-41
3