engine CHEVROLET CORVETTE 2007 6.G Service Manual

If the word OFF or the off symbol is lit on the
passenger airbag status indicator, it means that
the passenger sensing system has turned off
the passenger’s airbag(s). SeePassenger Sensing
System on page 59for more on this, including
important safety information.
If, after several seconds, all status indicator lights
remain on, or if there are no lights at all, there
may be a problem with the lights or the passenger
sensing system. See your dealer for service.
{CAUTION:
If the airbag off indicator and the airbag
readiness light ever come on together, it
means that something may be wrong with
the airbag system. If this ever happens,
have the vehicle serviced promptly,
because an adult-size person sitting in
the right front passenger seat may not
have the protection of the airbag. See
Airbag Readiness Light on page 191.
Voltmeter Gage
The voltmeter shows
the voltage output
of your battery.
When the engine is
running, it shows
the voltage output of
the charging system.
The reading will change as the rate of charge
changes (with engine speed, for example), but if
the voltmeter reads at 9 volts or below, your
instrument panel cluster and other systems may
shut down. The Driver Information Center (DIC)
will read BATTERY VOLTAGE LOW when
your vehicle is at 10 volts or below. Have it
checked right away. Driving with the voltmeter
reading at 10 volts or below could drain your
battery and disable your vehicle.
194

One-to-Four Shift Light
(Manual Transmission)
When this light comes
on, you can only shift
from FIRST (1) to
FOURTH (4) instead of
FIRST (1) to
SECOND (2).
You must complete the shift into FOURTH (4) to
turn off this feature. This helps you get the
best possible fuel economy.After shifting to FOURTH (4), you may downshift
to a lower gear if you prefer.
Notice:Forcing the shift lever into any gear
except FOURTH (4) when the 1 TO 4 SHIFT light
comes on may damage the transmission.
Shift only from FIRST (1) to FOURTH (4) when
the light comes on.
This light will come on when:
The engine coolant temperature is higher than
169°F (76°C),
the vehicle is going 15 to 19 mph
(24 to 31 km/h) and
the vehicle 21 percent throttle or less.
195

Brake System Warning Light
Your vehicle’s hydraulic brake system is divided
into two parts. If one part is not working, the other
part can still work and stop you. For good
braking, though, you need both parts working well.
This light should come on when you start the
engine. If it does not come on then, have it xed
so it will be ready to warn you if there is a problem.
If this warning light stays on after you start the
engine, the parking brake may still be set or
there could be a brake problem. Refer to
Parking Brake on page 102to see if it is set.
If the parking brake is not set, have your brake
system inspected right away.If the light comes on while you are driving and you
have a CHECK BRAKE FLUID message showing
on the DIC, pull off the road and stop carefully.
You may notice that the pedal is harder to push or
the pedal may go closer to the oor. It may take
longer to stop. If the light is still on, have the
vehicle towed for service. SeeTowing Your
Vehicle on page 315andDIC Warnings and
Messages on page 214for more information.
{CAUTION:
Your brake system may not be working
properly if the brake system warning light
is on. Driving with the brake system
warning light on can lead to an accident.
If the light is still on after you have pulled
off the road and stopped carefully, have
the vehicle towed for service.United StatesCanada
196

Anti-Lock Brake System
Warning Light
With the Anti-Lock
Brake System (ABS),
this light will come on
when the engine is
started and may stay on
for several seconds.
If the light stays on, turn the ignition off. If the light
comes on when you are driving, stop as soon as
possible and turn the ignition off. Then start the
engine again to reset the system. If the light still
stays on, or comes on again while you are driving,
your vehicle needs service. If the regular brake
system warning light is not on, you still have brakes,
but you do not have anti-lock brakes. If the regular
brake system warning light is also on, you do not
have anti-lock brakes and there is a problem with
your regular brakes. See “SERVICE ANTILOCK
BRAKES” underDIC Warnings and Messages on
page 214.
The ABS warning light will come on briey when
you turn the ignition on. This is normal. If the light
does not come on then, have it xed so it will be
ready to warn you if there is a problem.
Traction Control System (TCS)
Warning Light
This light should come
on briey as you start
the engine. If the
light does not come
on then, have it xed
so it will be ready
to warn you if there
is a problem.
If it stays on, or comes on and the Driver
Information Center (DIC) shows a SERVICE
TRACTION SYSTEM message when you
are driving, there is a problem with your Traction
Control System (TCS) and your vehicle needs
service. When this light is on, the system will not
limit wheel spin. Adjust your driving accordingly.
If the driver turns off the TCS by pressing the
button on the console, the TCS light will come
on and the TRACTION SYSTEM OFF message
will show on the DIC. SeeDIC Warnings and
Messages on page 214for more information.
197

Active Handling System Light
The Active Handling System light will come on
briey as you start the engine. If the light does not
come on then, have it xed so it will be ready to
warn you if there is a problem. This light will
also come on when the ACTIVE HANDLING
CALIBRATING message is displayed in the
Driver Information Center (DIC).
If the light stays on or
comes on while you are
driving, a chime sounds
and a SERVICE ACTIVE
HANDLING SYSTEM
message appears
on the DIC, there is
a problem with your
Active Handling System
and your vehicle
needs service.
The driver can acknowledge this message by
pressing the RESET button. When the SERVICE
ACTIVE HANDLING SYSTEM message is
displayed in the DIC, the Active Handling Systemwill not assist you in controlling the vehicle.
You should have the system serviced as soon
as possible. Adjust your driving accordingly.
When the system is working, you will see the
ACTIVE HANDLING message displayed in
the DIC. You may also feel or hear the system
working. This is normal.
If the driver turns off the Active Handling System
by pressing the button on the console for
ve seconds, the Active Handling System light will
come on, a chime will sound, and the TRACTION
SYSTEM AND ACTIVE HANDLING – OFF
message will be displayed in the DIC. The Traction
Control System will also be turned off. SeeDIC
Warnings and Messages on page 214for
more information.
If the Active Handling System and the Traction
Control System are off, pressing the console
button momentarily will turn both systems on.
The DIC will display the TRACTION SYSTEM
AND ACTIVE HANDLING – ON message,
the instrument cluster light will be off, and a
chime will sound. SeeDIC Warnings and
Messages on page 214for more information.
198

Engine Coolant Temperature Gage
This gage shows the engine coolant temperature.
If the gage pointer moves into the shaded area,
your engine is too hot.
This means that your engine coolant has
overheated. If you have been operating your
vehicle under normal driving conditions, you should
pull off the road, stop your vehicle and turn off
the engine as soon as possible.
SeeEngine Overheating on page 350for more
information.
Tire Pressure Light
This light will come on
briey when you turn
the ignition on.
This light will also come on when one or more of
your tires are signicantly underinated.
A LOW TIRE PRESSURE message in the Driver
Information Center (DIC) will accompany the light,
seeDIC Warnings and Messages on page 214
Stop and check your tires as soon as it is safe to do
so. If underinated, inate to the proper pressure.
SeeTires on page 378for more information.
This light will ash for about 60 seconds and
then turn on solid if a problem is detected with
the Tire Pressure Monitor system.
SeeTire Pressure Monitor System on page 389
for more information.
United StatesCanada
199

Malfunction Indicator Lamp
Check Engine Light
Your vehicle has a
computer which
monitors operation
of the fuel, ignition,
and emission control
systems.
This system is called OBD II (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 check engine 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 awhile, the emission controls
might not work as well, your vehicle’s fuel
economy might not be as good, and the engine
might not run as smoothly. This could lead
to costly repairs that might not be covered by
your warranty.
Notice:Modications made to the engine,
transmission, exhaust, intake, or fuel system
of your vehicle or the replacement of the
original tires with other than those of the same
Tire Performance Criteria (TPC) can affect
your vehicle’s emission controls and can cause
this light to come on. Modications to these
systems could lead to costly repairs not
covered by your warranty. This could also
result in a failure to pass a required Emission
Inspection/Maintenance test. SeeAccessories
and Modifications on page 319.
200

This light should come on briey, as a check to
show you it is working, as you start the engine.
If the light does not come on, have it repaired.
This light will also come on during a malfunction
in one of two ways:
Light Flashing— A misre condition has
been detected. A misre increases vehicle
emissions and may damage the emission
control system on your vehicle. Diagnosis
and service may be required.
Light On Steady— An emission control
system malfunction has been detected on
your vehicle. Diagnosis and service may
be required.
If the Light Is Flashing
The following may prevent more serious damage
to your vehicle:
Reducing vehicle speed
Avoiding hard accelerations
Avoiding steep uphill grades
If the light stops ashing and remains on steady,
see “If the Light Is On Steady” following.
If the light continues to ash, when it is safe to
do so, stop the vehicle. Find a safe place to
park your vehicle. Turn the engine 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 ashing,
follow the previous steps, and see your dealer
for service as soon as possible.
201

If the Light Is On Steady
You also 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. SeeFilling the Tank on page 324.
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 vehicle’s 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.Have you recently changed brands of fuel?
If so, be sure to fuel your vehicle with quality fuel.
SeeGasoline Octane on page 321. Poor fuel
quality will cause the 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,
misring, 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, your dealer can check the vehicle.
Your dealer has the proper test equipment and
diagnostic tools to x any mechanical or electrical
problems that may have developed.
202

Emissions Inspection and
Maintenance Programs
Some state/provincial and local governments have
or may begin programs to inspect the emission
control equipment on your vehicle. Failure to pass
this inspection could prevent you from getting a
vehicle registration.
Here are some things you need to know to help
your vehicle pass an inspection:
Your vehicle will not pass this inspection if the
check engine light is on or not working properly.
To perform a check engine light bulb check with the
keyless ignition, make sure the transmitter fob is in
the passenger compartment. SeeIgnition Positions
on page 90. Press the bottom of the Acc. button on
the instrument panel and hold the button down for
ve seconds. The instrument panel, including the
check engine light, will light up and the ignition will
be on, but the engine will not start — if you pressthe bottom of the Acc. button only briey, less than
ve seconds, the accessory power mode will be
turned on, but not the ignition. After the bulb check,
be sure to press and release the Acc. button again
to turn the ignition off and avoid draining the
vehicle’s battery.
Your vehicle will not pass this inspection if the
OBD (on-board diagnostic) system determines that
critical emission control systems have not been
completely diagnosed by the system. The vehicle
would be considered not ready for inspection.
This can happen if you have recently replaced
the battery or if the battery has run down.
The diagnostic system is designed to evaluate
critical emission control systems during normal
driving. This may take several days of routine
driving. If you have done this and your vehicle
still does not pass the inspection for lack of
OBD system readiness, your dealer can prepare
the vehicle for inspection.
203