2003 GMC SONOMA fuel pressure

Instrument Panel Overview...............................3-2
Hazard Warning Flashers................................3-3
Other Warning Devices...................................3-4
Horn .............................................................3-4
Tilt Wheel.....................................................3-4
Turn Signal/Multifunction Lever.........................3-5
Exterior Lamps.............................................3-10
Interior Lamps..............................................3-14
Accessory Power Outlets...............................3-15
Ashtrays and Cigarette Lighter........................3-16
Climate Controls............................................3-17
Climate Control System.................................3-17
Outlet Adjustment.........................................3-19
Warning Lights, Gages and Indicators.............3-20
Instrument Panel Cluster................................3-21
Speedometer and Odometer...........................3-23
Trip Odometer..............................................3-23
Tachometer.................................................3-23
Safety Belt Reminder Light.............................3-23
Air Bag Readiness Light................................3-24
Air Bag Off Light..........................................3-24
Charging System Light..................................3-26
Voltmeter Gage............................................3-26
Up-Shift Light...............................................3-27
Brake System Warning Light..........................3-27Anti-Lock Brake System Warning Light.............3-28
Engine Coolant Temperature Gage..................3-29
Malfunction Indicator Lamp.............................3-29
Oil Pressure Gage........................................3-32
Security Light...............................................3-33
Service Four-Wheel Drive Warning Light..........3-34
Check Gages Warning Light...........................3-34
Fuel Gage...................................................3-35
Low Fuel Warning Light.................................3-35
Audio System(s).............................................3-36
Setting the Time for Radios without Radio
Data Systems (RDS)..................................3-36
Setting the Time for Radios with Radio
Data Systems (RDS)..................................3-37
AM-FM Radio...............................................3-37
Radio with CD..............................................3-40
Radio with Cassette and CD..........................3-47
Radio with Six-Disc CD.................................3-56
Theft-Deterrent Feature (Non-RDS Radios).......3-67
Theft-Deterrent Feature (RDS Radios).............3-67
Understanding Radio Reception......................3-67
Care of Your Cassette Tape Player.................3-68
Care of Your CDs
.........................................3-69
Care of Your CD Player
................................3-69
Fixed Mast Antenna
......................................3-69
Section 3 Instrument Panel
3-1
2003 - Sonoma OM

Once you are moving on the freeway, make certain
you allow a reasonable following distance. Expect
to move slightly slower at night.
When you want to leave the freeway, move to the
proper lane well in advance. If you miss your exit, do
not, under any circumstances, stop and back up.
Drive on to the next exit.
The exit ramp can be curved, sometimes quite sharply.
The exit speed is usually posted.
Reduce your speed according to your speedometer, not
to your sense of motion. After driving for any distance
at higher speeds, you may tend to think you are
going slower than you actually are.
Before Leaving on a Long Trip
Make sure you’re ready. Try to be well rested. If you
must start when you’re not fresh—such as after a day’s
work—don’t plan to make too many miles thatrst
part of the journey. Wear comfortable clothing and shoes
you can easily drive in.Is your vehicle ready for a long trip? If you keep it
serviced and maintained, it’s ready to go. If it needs
service, have it done before starting out. Of course,
you’llnd experienced and able service experts in
GM dealerships all across North America. They’ll be
ready and willing to help if you need it.
Here are some things you can check before a trip:
Windshield Washer Fluid:Is the reservior full?
Are all windows clean inside and outside?
Wiper Blades:Are they in good shape?
Fuel, Engine Oil, Other Fluids:Have you checked
all levels?
Lamps:Are they all working? Are the lenses clean?
Tires:They are vitally important to a safe,
trouble-free trip. Is the tread good enough for
long-distance driving? Are the tires all inated to the
recommended pressure?
Weather Forecasts:What’s the weather outlook
along your route? Should you delay your trip a
short time to avoid a major storm system?
Maps:Do you have up-to-date maps?
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2003 - Sonoma OM

Loading Your Vehicle
The Certication/Tire label is found on the driver’s
door edge, above the door latch. The label shows the
size of your original tires and the ination pressures
needed to obtain the gross weight capacity of your
vehicle. This is called the Gross Vehicle Weight
Rating (GVWR). The GVWR includes the weight of the
vehicle, all occupants, fuel, cargo and trailer tongue
weight, if pulling a trailer.The Certication/Tire label also tells you the maximum
weights for the front and rear axles, called Gross
Axle Weight Rating (GAWR). Tond out the actual loads
on your front and rear axles, you need to go to a
weigh station and weigh your vehicle. Your dealer can
help you with this. Be sure to spread out your load
equally on both sides of the centerline.
Never exceed the GVWR for your vehicle, or the GAWR
for either the front or rear axle.
And, if you do have a heavy load, you should spread
it out.
Similar appearing vehicles may have different GVWRs
and payloads. Please note the Certication/Tire label on
your truck or consult your dealer for additional details.{CAUTION:
In the case of a sudden stop or collision,
things carried in the bed of your truck could
shift forward and come into the passenger
area, injuring you and others. If you put things
in the bed of your truck, you should make sure
they are properly secured.
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2003 - Sonoma OM

Service............................................................5-3
Doing Your Own Service Work.........................5-3
Adding Equipment to the Outside of
Your Vehicle..............................................5-4
Fuel................................................................5-4
Gasoline Octane............................................5-4
Gasoline Specifications....................................5-5
California Fuel...............................................5-5
Additives.......................................................5-5
Fuels in Foreign Countries...............................5-6
Filling Your Tank............................................5-6
Filling a Portable Fuel Container.......................5-8
Checking Things Under
the Hood......................................................5-8
Hood Release................................................5-9
Engine Compartment Overview.......................5-10
Engine Oil...................................................5-13
Engine Air Cleaner/Filter................................5-18
Automatic Transmission Fluid
.........................5-20
Manual Transmission Fluid
.............................5-23
Hydraulic Clutch
...........................................5-24Engine Coolant.............................................5-25
Radiator Pressure Cap..................................5-27
Engine Overheating.......................................5-28
Cooling System............................................5-30
Engine Fan Noise.........................................5-36
Power Steering Fluid.....................................5-37
Windshield Washer Fluid................................5-38
Brakes........................................................5-39
Battery........................................................5-42
Jump Starting...............................................5-43
Rear Axle.......................................................5-47
Four-Wheel Drive............................................5-48
Front Axle......................................................5-49
Bulb Replacement..........................................5-50
Halogen Bulbs..............................................5-50
Headlamps..................................................5-50
One-Piece Front Turn Signal Lamps................5-52
Two-Piece Front Turn Signal Lamps................5-53
Center High-Mounted Stoplamp (CHMSL).........5-54
Taillamps.....................................................5-55
Replacement Bulbs.......................................5-55
Section 5 Service and Appearance Care
5-1
2003 - Sonoma OM

6. Start the engine and let it run until you can feel the
upper radiator hose getting hot. Watch out for the
engine cooling fan.
7. By this time, the coolant level inside the radiator
filler neck may be lower. If the level is lower, add
more of the proper DEX-COOL
®coolant mixture
through thefiller neck until the level reaches
the base of thefiller neck.8. Then replace the pressure cap. At any time during
this procedure if coolant begins toflow out of the
filler neck, reinstall the pressure cap. Be sure
the arrow on the pressure cap lines up like this.Engine Fan Noise
This vehicle has a clutched engine cooling fan. When
the clutch is engaged, the fan spins faster to provide
more air to cool the engine. In most everyday driving
conditions, the clutch is not engaged. This improves fuel
economy and reduces fan noise. Under heavy vehicle
loading, trailer towing and/or high outside temperatures,
the fan speed increases when the clutch engages.
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2003 - Sonoma OM

Notice:Don’t let anyone tell you that underination
or overination is all right. It’s not. If your tires
don’t have enough air (underination), you can get
the following:
Too muchexing
Too much heat
Tire overloading
Bad wear
Bad handling
Bad fuel economy
If your tires have too much air (overination),
you can get the following:
Unusual wear
Bad handling
Rough ride
Needless damage from road hazards
When to Check
Check your tires once a month or more.
Also, check the tire pressure of the spare tire.
If you have a compact spare tire, it should be
at 60 psi (420 kPa).
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.
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2003 - Sonoma OM

Fuse Usage
TRL TRN Trailer Left Turn
TRR TRN Trailer Right Turn
TRL B/U Trailer Back Up Lamps
VEH B/U Vehicle Back Up Lamps
HDLP PWR Headlamp PowerFuse Usage
RT TURN Right Turn Signal Front
LT TURN Left Turn Signal Front
HDLP W/W Not Used
LT TRN Left Turn Signal Rear
RT TRN Right Turn Signal Rear
RR PRK Right Rear Parking Lamps
TRL PRK Trailer Park Lamps
LTHDLP Left Headlamp
RTHDLP Right Headlamp
FRPRK Front Parking Lamps
INT BAT Instrument Panel Fuse Block Feed
ENG I Engine Sensors/Solenoids, MAF,
CAM, PURGE, VENT
ECM B Engine Control Module, Fuel Pump
Module, Oil Pressure
ABS Anti-Lock Brake System
ECM I Engine Control Module Injectors
F/PUMP Fuel Pump
DRL Daytime Running Lamps
A/C Air Conditioning
HORN Horn
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2003 - Sonoma OM

Capacities and Specications
Please refer toPart E: Maintenance Record on page 6-35in the index for more information. See refrigerant change
label under the hood for charge capacity information and requirements.
ApplicationCapacities
English Metric
Wheel Nut Torque 100 lb ft 140Y
Tire PressureSee the Certification/Tire label.
See″Loading Your Vehicle″in the Index.
Cooling System
2.2L Engine
4.3L Engine w/Auto. Trans.
4.3L Engine w/Manual. Trans.9.9 quarts
13.8 quarts
14.1 quarts9.4 L
13.1 L
13.3 L
Engine Oil with Filter*
2.2L Engine
4.3L Engine4.5 quarts
4.5 quarts4.3 L
4.3 L
Fuel Capacity
Reg/Ext. Cab
Crew Cab
®
18.0 gallons
17.5 gallons70.0 L
67.4 L
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2003 - Sonoma OM