1999 CHEVROLET S10 ECU

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5-7
A. Heavy Metal Engine Part
B. Good Battery
C. Dead Battery
Towing Your Vehicle
CAUTION:
To help avoid serious personal injury to you
or others:

Never let passengers ride in a vehicle that is
being towed.

Never tow faster than safe or posted speeds.

Never tow with damaged parts not
fully secured.

Never get under your vehicle after it has
been lifted by the tow truck.

Always secure the vehicle on each side with
separate safety chains when towing it.

Use only the correct hooks.

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5-28
CAUTION:
Incorrect wheel nuts or improperly tightened
wheel nuts can cause the wheel to become loose
and even come off. This could lead to an accident.
Be sure to use the correct wheel nuts. If you have
to replace them, be sure to get new GM original
equipment wheel nuts.
Stop somewhere as soon as you can and have
the nuts tightened with a torque wrench to
100 lb
-ft (140 N´m).
NOTICE:
Improperly tightened wheel nuts can lead to
brake pulsation and rotor damage. To avoid
expensive brake repairs, evenly tighten the wheel
nuts in the proper sequence and to the proper
torque specification.
Storing a Flat or Spare Tire and Tools
CAUTION:
Storing a jack, a tire or other equipment in the
passenger compartment of the vehicle could
cause injury. In a sudden stop or collision, loose
equipment could strike someone. Store all these
in the proper place.
NOTICE:
Don't use the existing hoist to store a tire with an
aluminum wheel or it could damage the wheel.
Secure the tire in the pickup bed.

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5-29
Follow this diagram to store the underbody-mounted spare.
A. Wheel Wrench
B. Hoist Assembly
C. Retainer
D. Spring
E. TireF. Valve Stem
(Pointed Down)
G. Lower
H. Raise1. Put the tire on the ground at the rear of the vehicle,
with the valve stem pointed down and to the rear.
2. Pull the retainer through the wheel.
Note that with the ZR2 option, the spring and
retainer must be separated to insert through the
wheel opening.
3. Put the chisel end of the wheel wrench on an angle,
through the hole in the rear bumper and into the hoist
shaft. Turn the wheel wrench clockwise until the tire
is raised against the underside of the vehicle.
You will hear two ªclicksº when the tire is secure,
but pull on the tire to make sure.

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5-30
Return the jack, wheel wrench and wheel blocks to the
proper location behind the seat. Secure the items.
A. Wheel Wrench
B. Bracket
C. Jacking Instructions
(Roll and place
tag behind the
bracket after the
tools are installed.)
D. Bolt Location
(Standard)E. Bolt Location
(ZR2)
F. Wheel Blocks
G. Nut
H. Rubber Band
I. Jack Position (ZR2)
J. Jack Position
(Standard)Replace the jack cover, if you have one.A. Hub Cap Removal Tool (Some Models)
B. Cover (Extended Cab)
C. Cover (Standard Cab)
D. Hub Cap Removal Tool (Some Models)
E. Bolt

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6-15
If none of them is true, use the long trip/highway
maintenance schedule. Change the oil and filter every
7,500 miles (12 500 km) or 12 months
-- whichever
occurs first. Driving a vehicle with a fully warmed
engine under highway conditions causes engine oil to
break down slower.
Remote Oil Filter (Four
-Wheel Drive)
The access door for the
remote oil filter is in the
steering linkage shield
assembly located under
the radiator support.
Twist the screw to unlock
or lock the door. Make
sure if you open the door,
it is securely closed
when you are finished.
What to Do with Used Oil
Did you know that used engine oil contains certain
elements that may be unhealthy for your skin and could
even cause cancer? Don't let used oil stay on your skin
for very long. Clean your skin and nails with soap and
water, or a good hand cleaner. Wash or properly throw
away clothing or rags containing used engine oil. (See
the manufacturer's warnings about the use and disposal
of oil products.)
Used oil can be a real threat to the environment. If you
change your own oil, be sure to drain all free
-flowing oil
from the filter before disposal. Don't ever dispose of oil
by putting it in the trash, pouring it on the ground, into
sewers, or into streams or bodies of water. Instead,
recycle it by taking it to a place that collects used oil. If
you have a problem properly disposing of your used oil,
ask your dealer, a service station or a local recycling
center for help.

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6-51
NOTICE: (Continued)
If you do find traction devices that will fit, install
them on the rear tires.
If you have other size tires, use tire chains only
where legal and only when you must. Use only
SAE Class ªSº type chains that are the proper
size for your tires. Install them on the drive axle
tires (four
-wheel-drive vehicles can use chains on
both axles) and 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.
Appearance Care
Remember, cleaning products can be hazardous. Some
are toxic. Others can burst into flame if you strike a
match or get them on a hot part of the vehicle. Some are
dangerous if you breathe their fumes in a closed space.
When you use anything from a container to clean your
vehicle, be sure to follow the manufacturer's warnings
and instructions. And always open your doors or
windows when you're cleaning the inside.
Never use these to clean your vehicle:

Gasoline

Benzene

Naphtha

Carbon Tetrachloride

Acetone

Paint Thinner

Turpentine

Lacquer Thinner

Nail Polish Remover
They can all be hazardous
-- some more than
others
-- and they can all damage your vehicle, too.

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9-2
Brakes
Adjustment 6-34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Anti-Lock 4-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Master Cylinder 6-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pedal Travel 6-34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing System Parts 6-34 . . . . . . . . . . . . . . . . . . . . . . . .
Trailer 4-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wear 6-33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake-Transmission Shift Interlock Check 7-44 . . . . . . . . . . .
Braking 4-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Braking in Emergencies 4-9 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Break-In, New Vehicle 2-12 . . . . . . . . . . . . . . . . . . . . . . . . . .
Brightness Control 2-43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BTSI Check 7-44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bulb Replacement 6-35, 6-67 . . . . . . . . . . . . . . . . . . . . . . . . .
Canadian Roadside Assistance 8-7 . . . . . . . . . . . . . . . . . . . .
Capacities and Specifications 6-67, 6-68 . . . . . . . . . . . . . . . . .
Carbon Monoxide 2-31, 4-39 . . . . . . . . . . . . . . . . . . . . . . . . .
Care of Your Cassette Tape Player 3-24, 7-42 . . . . . . . . . . . . .
Cassette Deck Service 7-42 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Center High-Mounted Stoplamp Bulb Replacement 6-39 . . . .
Center Passenger Position 1-31 . . . . . . . . . . . . . . . . . . . . . . . .
Certification/Tire Label 4-40 . . . . . . . . . . . . . . . . . . . . . . . . . .
Chains
Safety 4
-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tire 6-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Changing a Flat Tire 5-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charging System Light 2-58 . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Gages Light 2-65 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking Your Restraint Systems 1-52 . . . . . . . . . . . . . . . . . .
Chemical Paint Spotting 6-58 . . . . . . . . . . . . . . . . . . . . . . . . . . Child Restraints 1
-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Securing in the Right Front Seat Position 1-44 . . . . . . . . . .
Top Strap 1-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Where Not to Put 1-43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cigarette Lighter 2-48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Breakers and Fuses 6-62 . . . . . . . . . . . . . . . . . . . . . . .
Cleaner, Air 6-16, 6-70 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning
Aluminum Wheels 6
-56 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fabric 6-52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glass 6-54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inside of Your Vehicle 6-52 . . . . . . . . . . . . . . . . . . . . . . . . .
Instrument Panel 6-54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interior Plastic Components 6-54 . . . . . . . . . . . . . . . . . . . . .
Leather 6-54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Outside of Your Vehicle 6-55 . . . . . . . . . . . . . . . . . . . . . . . .
Safety Belts 6-54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stains 6-53 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tires 6-57 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vinyl 6-54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Weatherstrips 6-55 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wheels 6-56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windshield and Wiper Blades 6-55 . . . . . . . . . . . . . . . . . . .
Climate Control System 3-2, 3-3 . . . . . . . . . . . . . . . . . . . . . . .
Clock, Setting 3-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clutch, Hydraulic 6-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Comfort Controls 3-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compact Disc Care 3-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compact Spare Tire 5-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Content Theft-Deterrent 2-10 . . . . . . . . . . . . . . . . . . . . . . . . .
Control of a Vehicle 4-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Convex Outside Mirror 2-46 . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant 5-11, 6-26, 6-68 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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9-6
Lights
Air Bag Off 1-28, 2-56 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Bag Readiness 1-22, 2-56 . . . . . . . . . . . . . . . . . . . . . . .
Anti-Lock Brake System Warning 2-60, 4-7 . . . . . . . . . . . .
Brake System Warning 2-60 . . . . . . . . . . . . . . . . . . . . . . . . .
Charging System 2-58 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Gages 2-65 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Fuel 2-66 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Belt Reminder 1-7, 2-55 . . . . . . . . . . . . . . . . . . . . . .
Security Warning 2-64 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service 4WD 2-65 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Engine Soon 2-61 . . . . . . . . . . . . . . . . . . . . . . . . . .
Shift 2-23, 2-59 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loading, Truck-Camper 4-43 . . . . . . . . . . . . . . . . . . . . . . . . .
Loading Your Vehicle 4-40 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loading Your Vehicle Off-Road Driving 4-14 . . . . . . . . . . . .
Locking Rear Axle 2-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lockout Prevention 2-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Locks
Door 2
-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition Transmission Check 7-45 . . . . . . . . . . . . . . . . . . . .
Key Lock Cylinder Service 7-43 . . . . . . . . . . . . . . . . . . . . .
Power Door 2-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loss of Control 4-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Fuel Light 2-66 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lubricants and Fluids 7-48 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lubrication Service
Body 7
-43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tailgate 7-43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lumbar Controls 1-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Record 7-51 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Schedule 7-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Long Trip/Highway 7-6, 7-29 . . . . . . . . . . . . . . . . . . . . . . .
Owner Checks and Services 7-42 . . . . . . . . . . . . . . . . . . . . .
Periodic Maintenance Inspections 7-46 . . . . . . . . . . . . . . . .
Recommended Fluids and Lubricants 7-48 . . . . . . . . . . . . .
Scheduled Maintenance Services 7-4 . . . . . . . . . . . . . . . . . .
Short Trip/City 7-5, 7-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance, Underbody 6-58 . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance When Trailer Towing 4-54 . . . . . . . . . . . . . . . . .
Malfunction Indicator Lamp 2-61 . . . . . . . . . . . . . . . . . . . . . .
Manual Front Seat 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Lumbar Support 1-3 . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Transmission
Check 7
-43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid 6-20, 7-48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation 2-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shifting 2-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Methanol 6-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mirrors 2-45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Convex Outside 2-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Illuminated Visor Vanity 2-49 . . . . . . . . . . . . . . . . . . . . . . .
Inside Day/Night Rearview 2-45 . . . . . . . . . . . . . . . . . . . . .
Power Remote Control 2-45 . . . . . . . . . . . . . . . . . . . . . . . . .
Visor Vanity 2-48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model Reference vi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mountain Roads 4
-34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Multifunction Lever 2-35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Neutral
Automatic Transmission 2-20 . . . . . . . . . . . . . . . . . . . . . . .
Manual Transmission 2-22 . . . . . . . . . . . . . . . . . . . . . . . . . .
New Vehicle ªBreak-Inº 2-12 . . . . . . . . . . . . . . . . . . . . . . . . .