check engine CHEVROLET CORVETTE 1994 4.G User Guide

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Passing Another Vehicle While Using
Cruise Control
Use the accelerator pedal to increase your
speed. When you take your foot off the
pedal, your vehicle will slow down to the
Cruise Control speed you set earlier.
Using Cruise Control on Hills
How well your Cruise Control will work
on hills depends upon your speed, load,
and the steepness of the hills. When going
up steep hills, you may have to step on
the accelerator pedal to maintain your
speed. When going downhill, you may
have to brake or shift to a lower gear to
keep your speed down. Of course,
applying the brake takes you out of
Cruise Control. Many drivers find this to
be too much trouble and don’t use Cruise
Control on steep hills.
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:o Get Out of Cruise Control
’here are several ways to turn off the
bise Control:
. Step lightly on the brake pedal or push
the clutch pedal, if you have a manual
transmission;
OR
!. Move the Cruise switch to “OFF.”
ro Erase Speed Memory
Nhen you turn off the Cruise Control or
he ignition, your Cruise Control set speed
nemory is erased.
Operation of Lights
4lthough your vehicle’s lighting system
:headlights, parking lights, fog lamps,
sidemarker lights and taillights) meets all
applicable federal lighting requirements,
2ertain states and provinces may apply
their own lighting regulations that may
require special attention before you
operate these lights.
For example, some jurisdictions may
require that you operate your fog lamps
only when your lower beam headlights
are also on, or that headlights be turned
on whenever you must use your
windshield wipers. In addition, most
jurisdictions prohibit driving solely with
parking lights, especially at dawn or dusk.
It is recommended that you check with
your own state or provincial highway
authority for applicable lighting
regulations.

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Warning Lights, Gauges
and Indicators
This section describes the warning lights
and gauges that may be on your vehicle.
The pictures will help you locate them.
Warning lights and gauges can signal that
something is wrong before it becomes
serious enough to cause an expensive
repair or replacement. Paying attention
to your warning lights and gauges could
also save you or others from injury.
Warning lights go on when there may be
or
is a problem with one of your vehicle’s
functions.
As you will see in the details
on the
next few pages, some warning
lights come on briefly when you turn the
ignition key just to let you know they’re
working. If you are familiar with this
section, you should not be alarmed when
this happens.
Gauges can indicate when there may be
or is a problem with one of your vehicle’s
functions. Often gauges and warning
lights work together to
let you know
when there’s a problem with your vehicle.
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When one of the warning lights comes on
and stays on when you are driving, or
when one of the gauges shows there may
be a problem, check the section that tells
you what to do about
it. Please follow the
manual’s advice. Waiting to
do repairs
can be costly
- and even dangerous. So
please get to know your warning lights
and gauges. They’re a big help.
Your vehicle also has a driver information
center that works along with the warning
lights and gauges. See “Driver Information Center’’
in the Index.
System Problems
If “SYS” flashes on the display near your
fuel gauge, there may be a problem with
your Corvette’s electrical system. If the
“SECURITY” light flashes at the same
time, there is a problem with your theft
deterrent system. Have your vehicle
checked by your dealer
if “SYS’ keeps
appearing.
Gauge Markings
The analog gauges provide a quick visual
reference to the actual measurement of
these gauges. However, you must keep in mind that the gauges aren’t linear. This means that the middle mark is not
a
temperature halfway between the top and
bottom temperatures on the gauge. For
example, the middle mark on the coolant
gauge represents 210°F,
not 180°F as you
might expect.

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ABS
ACTIVE
Anti-Lock Brake System Active Light
When your anti-lock system is adjusting
brake pressure to help avoid a braking skid, the
“ABS ACTIVE’ light will come
on. Slippery road conditions may exist if
this light comes
on, so adjust your drivinl
accordingly. The light will stay on for a
few seconds after the system stops
adjusting brake pressure. The
“ABS ACTIVE’ light also comes on
briefly, as a bulb check, when the engine
is started.
. . .86
SERVICE
ASR
LSR System Warning Light
’his light will come on for a few seconds
vhen you turn the ignition on. If it stays
m, there may be a problem with
the ASR
ystem. See your dealer.
Vhen this warning light is on, the system
vi11 not limit
wheel spin. Adjust your
lriving accordingly.
ASR
OFF
LSR Off Light
’his light will come on for a few seconds
lrhen you turn the ignition
on. It also
omes on and stays on when the ASR
lutton is pressed to turn the system
off.
lee “Acceleration Slip Regulation
lystem” in the Index.

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ACTIVE
ASR Active Light
When your ASR system is limiting wheel
spin, the “ASR ACTIVE’ light will come
on. Slippery road conditions may exist if
this light comes
on, so adjust your driving
accordingly. The light will stay on for a
few seconds after the ASR system stops
limiting wheel spin. The “ASR ACTIVE’
light also comes
on briefly, as a bulb
check, when the engine is started.
Low Tire Pressure Warning Light
(Option)
The LTPWS has a sensor on each road
wheel that transmits to a receiver
on the
instrument panel. The system operates on
a radio frequency subject to Federal
Communications Commission (FCC)
Rules.
This device complies with Part
15 of the
FCC Rules. Operation
is subject to the
following two conditions:
1. This device may not cause harmful
2. This device must accept any
interference,
and
interference received, including
interference that may cause undesired
operation.
Changes or modifications to this system
by other than an authorized service
facility could void authorization to use
this equipment.
LOWIFLAT
TIRE
..
The Low Tire Pressure Warning System
(LTPWS) monitors air pressure in each
road tire while you’re driving your
Corvette. The “LOW/FLAT TIRE” light
will come
on whenever tire pressure in
any road tire goes below
25 psi (175 kPa)
and it will stay
on until you turn off the
ignition. The light may come on if any
LTPWS parts aren’t working properly.
..
8
87 ...

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For LTPWS to work properly, you must
drive your Corvette faster than
25 mph
(40 km/h) and for more than
2 miles
(4 km). The system will not warn you
before
you begin to drive that a tire is flat.
When the “LOW/FLAT TIRE’ light
comes on, check
the tire pressure in all
four road tires as soon as you can. Adjust
the tire pressure as needed to those shown
on the Tire-Loading Information label on
the driver’s door. If the light stays on after
the tire pressure is adjusted, see your
dealer.
NOTICE:
Driving with a flat tire may damage
the tire,
the wheel or the tire pressure
sensor installed inside the tire on the
wheel rim. Using tire sealants may
also damage
the sensor.
If you have EMTs, see “Extended
Mobility Tires”
in the Index. The
LTPWS sensor is directly opposite
the valve stem on the tire. Take care when
servicing or having your tires serviced.
The sensors may not work properly if
damaged. To prevent damage to the
sensors, see the 1994 Corvette Service
Manual for correct tire mounting and
dismounting procedures.
The “LOWRLAT TIRE” light may come
on if your vehicle is close to another
vehicle that has LTPWS and has a tire
with low pressure.
LTPWS can
warn you about a low tire,
but it does not replace normal tire
maintenance. See “Tires” in the Index.
. . .88

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For numeric gauge measurements, press
the
“GAUGES” button on the Trip
Monitor until
“COOL,” appears. The
number that appears next to the fuel
gauge is the coolant temperature. If
“LO’
appears, the temperature is below 32°F
(0°C).
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T VOLTS I
Voltmeter
You can read the charging system’s rate of
charge on your voltmeter when your
engine is running. When the engine is not
running, the voltmeter shows the voltage
output of yQur battery.
Readings between the shaded areas show
the normal operating range. The reading
will change as the rate of charge changes
(with engine speed, for example), but if
the voltmeter reads
in either shaded area,
and it stays there, you may have a
problem with the charging system. Have
it checked right away. Driving with the
voltmeter reading in a shaded area could
drain your battery. If you must
drive a short distance with the
voltmeter reading
in a shaded area, turn
off all your accessories, including your
comfort controls and audio systems.
For numeric gauge measurements,
press the
“GAUGES’’ button on the
Trip Monitor until “VOLt” appears.
The number that appears next to the fuel
gauge is
the battery voltage.

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SOON
0
Malfunction Indicator Lamp (Service Engine Soon Light)
A computer monitors operation of your
fuel, ignition and emission control
systems. This light should come on when
the ignition is on,
but the engine is not
running, as a check to show you it is
working. If it does not come on at all,
have it fixed right away. If it stays on, or
it comes on while you are driving, the
computer is indicating that you have a
problem.
You should take your vehicle in
for service soon.
NOTICE:
If you keep driving your vehicle
with this light on, after a while the
emission controls won’t work as
well, your fuel economy won’t be as
good and your engine may not
run as
smoothly. This could lead to costly
repairs not covered by your warranty.
W
OIL
PRESS
PSI
. .,
Engine Oil Pressure Gauge
This gauge tells you if there could be a
problem with your engine oil pressure.
The engine oil pressure gauge shows the
engine oil pressure
in psi (pounds per
square inch) or kPa (kilopascals) when
the engine is running. Oil pressure
should be
20 to 80 psi (140 to 550 kPa).
It may
vary with engine speed, outside
temperature and oil viscosity, but readings
above the shaded area show the normal
operating range. Readings in the shaded
area tell you that the engine
is low on oil,
or that you might have some other oil
problem. See “Engine Oil” in the Index.
91 ...

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I NOTICE:
I
Damage to your engine from
neglected oil problems can be costly
and is not covered by your warranty.
... 92
TEMP OIL
OF TEMP OIL
‘F
280
T1 Engine LT5 Enginl
Zngine Oil Temperature Gauge
rhis gauge shows your engine oil
emperature. Oil temperature may
vary
vith the type of driving you do and
weather conditions, but readings above
the shaded area show the normal
operating range. If your oil temperature
is close to the shaded area and it stays
there, your oil temperature is too high.
Check the engine coolant temperature
and engine oil level. If your engine
is too
hot, see “Engine Overheating” in the
Index. Your vehicle may need service;
see your dealer.
1 IZI I
I ,I I
)r numeric gauge measurements,
ness the
“GAUGES” button on the Trip
[onitor until
“OIL” appears. The number
at appears next to the fuel gauge is the
1 temperature. If “LO’ appears, the
mperature
is below 32°F (OOC).

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This 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 gauges to see if they are in
the warning areas.
This light can come on for:
high oil temperature or low oil
pressure
high coolant temperature
high or low battery voltage
low fuel level
LOW
OIL
L
Low Oil Light
This light should come on while you are
starting your engine. If
the light doesn’t
come on, have it repaired.
If the light
comes on while starting your engine and
stays on, your engine oil level may be too
low. You may need to add oil. See
“Engine Oil” in the Index.
LOW
COOLANT
Low Coolant Light
This light comes on when the coolant in
the system is low. You may need to add
coolant. See “Engine Coolant” in the
Index.
NOTICE:
Driving with the “LOW COOLANT”
light on could cause your Corvette to
overheat. See “Engine Overheating”
in the Index. Your Corvette could be
damaged, and it wouldn’t be covered
by your warranty.
93 ...

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Zharging System Light
rhis light will come on when you turn on
he ignition, but the engine is not running
LS a check to show you it is working. It
ihould go out when the engine starts. If
t stays on or comes on while you are
Iriving, you may have a problem with
he electrical charging system. It could
ndicate that you have a loose or broken
lrive belt or another electrical problem.
3ave it checked right away. Driving whil
his light is
on could drain your battery.
:f you must drive a short distance with thl
ight on, be certain to turn
off all your
tccessories, such as the radio and air
:onditioner.
loor Ajar Light
’his light comes on when you open one
If the doors with the ignition on. It stays
In until you fully close the door. Have
‘our vehicle serviced if the light comes
In and stays on even when the doors are
ully closed.
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Sngine Oil Life Monitor
?he “CHANGE OIL” light comes on for
, few seconds when you turn the ignition
In. It will come on and stay on when it’s
ime to change your oil.
:he monitor uses oil temperature and
rngine revolutions to decide when the oil
s nearly worn out. The light is only a
eminder, though. You should change
‘our oil at the intervals recommended in
‘our Maintenance Schedule, even if the
‘CHANGE
OIL” light hasn’t come on.
3e sure to reset the monitor when your oil
s changed, even if the “CHANGE OIL”
ight didn’t come on. If you don’t reset
he monitor, it won’t work correctly.
Tollow these steps:
... 94