1998 CHEVROLET EXPRESS Owners Manual

Downloaded from www.Manualslib.com manuals search engine Malfunction Indicator Lamp (Service Engine Soon Light) (Gasoline Engine)
81 Your vehicle is equipped
SERVICE
ENGINE
I
SOON
with a computer which
monitors operation
of the
fuel, ignition and emission
control systems.
This system is called OBD I1 (On-Board
Diagnostics-Second Generation) and
is intended to
assure that emissions
are at acceptable levels for the life
of the vehicle, helping
to produce a cleaner
environment. The
SERVICE ENGINE SOON light
comes on to indicate that there
is a problem and service
is required. Malfunctions often will be indicated by the
system before any problem is apparent. This may
prevent more serious damage to your vehicle. This
system
is also designed to assist your service technician
in correctly diagnosing any malfunction.
NOTICE:
If you keep driving your vehicle with this light
on, after a while, your emission controls may not
work as well, your fuel economy may not be
as
good and your engine may not run as smoothly.
This could lead
to costly repairs that may not be
covered by your warranty.
This light should come on, as a check to show you it is
working, when
the ignition is on and the engine is not
running. If the light doesn’t come on, have it repaired.
This light
will also come on during a malfunction in one
of two ways:
0
0
Light Flashing -- A misfire condition has been
detected.
A misfire increases vehicle emissions and
may damage the emission control system
on your
vehicle.
GM or qualified service center diagnosis
and service may be required.
Light On Steady -- An emission control system
malfunction has been detected on your vehicle.
GM
or qualified service center diagnosis and service may
be required.
2-58

Downloaded from www.Manualslib.com manuals search engine If the Light Is Flashing If the Light Is On Steady
b I
The following may prevent more serious damage to
your vehicle:
Reducing vehicle speed.
0 Avoiding hard accelerations.
Avoiding steep uphill grades.
If you are towing a trailer, reduce the amount of
cargo being hauled as soon as it is possible.
If
the light stops flashing and remains on steady, see “If
the Light Is On Steady” following.
If the light continues to flash, when it is safe
to do so,
stop the vehicle. Find a safe place to park your vehicle.
Turn the key off, wait at least
10 seconds and restart the
engine. If the light remains on steady, see “If the Light
Is On Steady” following. If the light is still flashing,
follow the previous steps, and drive the vehicle
to your
dealer or qualified service center for service.
You may be able to correct the emission system
malfunction by considering the following:
Did you recently put fuel into your vehicle?
If so, reinstall the fuel cap, making sure to fully install
the cap. The diagnostic system can determine if the fuel
cap has been left
off or improperly installed. A loose or
missing fuel cap will allow fuel to evaporate into the
atmosphere. A few driving trips with the cap properly
installed should turn the light off.
Did you just drive through a deep puddle of water?
If
so, your electrical system may be wet. The condition
will usually be corrected when the electrical system
dries out. A few driving trips should turn the light off.
Are
you low on fuel?
As your engine starts
to run out of fuel, your engine may
not run as efficiently as designed since small amounts of
air are sucked into the
fuel line causing a misfire. The
system can detect this. Adding fuel should correct this
condition. Make sure to install
the fuel cap properly. It
will take a few driving trips to turn the light off.
2-59

Downloaded from www.Manualslib.com manuals search engine Have you recently changed brands of fuel?
If
so, be sure to fuel your vehicle with quality fuel (see
“Fuel” in the Index). Poor fuel quality will cause your
engine not to run as efficiently as designed. You may
notice this as stalling after start-up, stalling when you
put the vehicle into gear, misfiring, hesitation on
acceleration or stumbling on acceleration. (These
conditions may
go away once the engine is warmed up.)
This will be detected by the system and cause the light
to turn on.
If you experience one or more of these conditions,
change the fuel brand you use. It will require at least one
full tank
of the proper fuel to turn the light off.
If none of the above steps have made the light turn off,
have your dealer or qualified service center check the
vehicle. Your dealer has the proper test equipment and
diagnostic tools to fix any mechanical or electrical
problems that may have developed.
Oil Pressure Gage
The oil pressure gage
pressure in psi (pounds per
square inch) when the
shows the engine oil
8o I
engine is running. Canadian
vehicles indicate pressure in kPa (kilopascals).
OIL Wh
Oil pressure may vary with engine speed, outside
temperature and oil viscosity, but readings above the low pressure zone indicate the normal operating range.
A reading in the low pressure zone may be caused by a
dangerously low oil level or other problem causing low
oil pressure. Check your oil as soon as possible.
2-60

Downloaded from www.Manualslib.com manuals search engine I A CAUTION:
Don’t keep driving if the oil pressure is low. If
you do, your engine can become so hot that it
catches fire. You or others could be burned.
Check your oil as soon
as possible and have your
vehicle serviced.
I NOTICE:
Damage to your engine from neglected oil
problems can be costly and
is not covered by
your warranty.
Security Light
SECURITY
This light will come on
briefly when you turn the
ignition key to START.
m
The light will stay on until the engine starts. If the
flashes, the Passlock%ystem has entered
a tampel light I-
mode. If the vehicle
fails to start, see “Passlock” in
the Index.
If the light comes
on continuously while driving and
stays on, there may be a problem with the Passlock
System.
Your vehicle will not be protected by Passlock,
and you should see your
GM dealer.
2-61

Downloaded from www.Manualslib.com manuals search engine Daytime Running Lamps Indicator Light
You may have this light on
the instrument panel. It will
light whenever the
DRL are
on. It is also a reminder to
turn on your headlamps
when driving at night.
Check Gages Light
CHECK
GAGES
The CHECK GAGES light
will come on briefly when
you are starting the engine.
If
the light comes on and stays on while you are driving,
check your coolant temperature and engine oil pressure
gages
to see if they are in the warning zones.
2-62

Downloaded from www.Manualslib.com manuals search engine .~ 1 Gage
\\'
E
FUEL ONLY UNLEADED
The
fuel gage, when the
ignition is
on, tells you
about how much fuel you
have left in your tank. Listed are
four situations you may experience with your
fuel gage:
At the gas station, the fuel pump shuts off before the
gage reads FULL
(F).
It takes a little more or less fuel to fill up than the
fuel gage indicated. For example, the gage may have
indicated the tank was half full, but
it actually took a
little more or less than half the tank's capacity
to fill
the tank.
The gage moves a little when you turn a corner or
speed up.
The gage will first indicate EMPTY
(E) before you
are out of fuel, and you should get more fuel as soon
as possible.
The gage doesn't go back to EMPTY (E) when you
turn off the ignition.
None
of these indicate a problem with the fuel gage.
2-63

Downloaded from www.Manualslib.com manuals search engine b% NOTES
2-64

Downloaded from www.Manualslib.com manuals search engine Section 3 Comfort Controls and Audio Systems
In this section, you’ll find out how to operate the comfort control and audio systems offered with your vehicle. Be
sure to read about the particular systems supplied with your vehicle.
3-2
3-2
3-3
3-4
3-5
3-6
3-6
3-6
3-7
3-7
3-7
3-7 Comfort Controls
Heater Controls
Heater/Air Conditioning Controls
Rear Heater (Without Air Conditioning)
Rear Air Conditioning and Rear Heater
Air Conditioning
Heating Ventilation Tips
Audio Systems
Setting the Clock for Systems without
Automatic Tone Control
Setting the Clock for Systems with
Automatic Tone Control
AM-FM Stereo 3-9
3-11
3- 16
3-20
3-2
1
3-23
3-24
3-25
3-26
3-26 3-27 AM-FM
Stereo with Cassette Tape Player
(If Equipped)
AM-FM Stereo with Cassette Tape and
Automatic Tone Control (If Equipped)
AM-FM Stereo with Compact Disc Player
and Automatic Tone Control (If Equipped)
Remote Compact Disc Player (If Equipped)
Theft-Deterrent Feature
(If Equipped)
Understanding Radio Reception
Tips About Your Audio System
Care
of Your Cassette Tape Player
Care of Your Compact Discs
Care
of Your Compact Disc Player
Power Antenna Mast Care