light CHEVROLET COLORADO 2007 1.G Workshop Manual

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 324.
192

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 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 you are towing a trailer, reduce the
amount of cargo being hauled as soon
as it is possibleIf 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 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 ashing, follow the
previous steps, and see your dealer for service
as soon as possible.
If the Light Is On Steady
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. SeeFilling the Tank on page 328.
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.
193

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.
Have you recently changed brands of fuel?
If so, be sure to fuel your vehicle with quality fuel.
SeeGasoline Octane on page 326. 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, 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.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.
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 your battery or if your 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.
194

Oil Pressure Light
{CAUTION:
Do not keep driving if the oil pressure is
low. If you do, your engine can become so
hot that it catches re. You or others could
be burned. Check your oil as soon as
possible and have your vehicle serviced.
Notice:Lack of proper engine oil maintenance
may damage the engine. The repairs would
not be covered by your warranty. Always follow
the maintenance schedule in this manual for
changing engine oil.The light will come on
when you turn your
key to ON or START.
It goes off once you start your engine. That is
a check to be sure the light works. If it does not
come on, be sure to have it xed so it will be
there to warn you if something goes wrong.
When the light comes on and stays on, it means
that oil is not owing through the engine properly.
The vehicle could be low on oil and it might
have some other system problem. SeeEngine
Oil on page 333and “OIL” underDIC Warnings
and Messages on page 202for more information.
195

Security Light
This light will come on
briey when you turn
the key to START.
The light will stay on
until the engine starts.
If the ignition is turned on, and the light ashes,
the Passlock
®system has entered a tamper
mode. If the vehicle fails to start, seePasslock®
on page 117.
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 dealer.
Also, seeContent Theft-Deterrent on page 115
for additional information regarding the security
light.
Cruise Control Light
This light comes on
whenever you set the
cruise control.
The light goes out when the cruise control is
turned off. SeeCruise Control on page 166for
more information.
Highbeam On Light
This light comes on
when the high-beam
headlamps are in use.
SeeHeadlamp High/Low-Beam Changer on
page 165for more information.
196

Daytime Running Lamps (DRL)
Indicator Light
This light turns
on whenever the
Daytime Running
Lamps are on.
SeeDaytime Running Lamps (DRL) on page 171
for more information.
Fuel Gage
When the ignition
is on, the fuel gage
tells you about
how much fuel you
have remaining in
the fuel tank.Here are four things that some owners ask
about. None of these indicate a problem with
your fuel gage:
At the gas station, the gas pump shuts off
before the gage reads full.
It takes a little more or less fuel to ll up than
the 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 ll the tank.
The gage moves a little when you turn a
corner or speed up.
The gage does not go back to empty when
you turn off the ignition.
When the fuel in the fuel tank is low, you will see
a LOW FUEL message on the Driver Information
Center (DIC) display. SeeDIC Warnings and
Messages on page 202for more information.
197

DIC Warnings and Messages
Messages are displayed on the DIC to notify the
driver that the status of the vehicle has changed
and that some action may be needed by the driver
to correct the condition. Multiple messages may
appear one after another. The messages are
displayed for several seconds each.
Some messages may not require immediate
action, but you should press and release the
trip odometer reset stem to acknowledge that you
received the messages and to clear them from
the display. Each message must be acknowledged
individually.
Some messages cannot be cleared from the
DIC display because they are more urgent.
These messages require action before they
can be cleared. You should take any messages
that appear on the display seriously and remember
that clearing the messages only makes the
messages disappear, not correct the problem.
The following are the possible messages that can
be displayed and some information about them.
AC (Air Conditioning) OFF
This message displays when the engine coolant
temperature is too high and the air conditioning
in your vehicle needs to be turned off. SeeEngine
Overheating on page 348andClimate Control
System on page 177for more information.
This message displays along with the ENG HOT
message.
ABS (Anti-Lock Brake System) FAULT
This message displays if there is a problem
with the Anti-Lock Brake System (ABS). Check
the ABS as soon as possible and have your
vehicle serviced by your dealer. SeeBrakes on
page 357andAnti-Lock Brake System Warning
Light on page 190for more information. Press
and release the reset stem to acknowledge
the message and clear it from the display.
BRAKES
This message displays if there is a problem with
the brakes. Check the brakes as soon as possible
and have your vehicle serviced by your dealer.
202

SeeBrakes on page 357andBrake System
Warning Light on page 189for more information.
Press and release the reset stem to acknowledge
the message and clear it from the display.
CHANGE OIL
This message displays when the oil needs to be
changed. Check the oil in your vehicle as soon
as possible and have your vehicle serviced by
your dealer. SeeEngine Oil on page 333
andScheduled Maintenance on page 442for
more information. Press and release the reset
stem to acknowledge the message and clear
it from the display.
DOORS
This message displays when one or more of
the doors is ajar. Check all the doors on your
vehicle to make sure they are closed. The
message clears from the display after all of
the doors are closed.
ENG (Engine) HOT
This message displays when the engine
coolant temperature is hot. Check the
engine coolant temperature gage.SeeEngine Coolant Temperature Gage on
page 191. Have your vehicle serviced by your
dealer as soon as possible if you suspect
the engine is overheating. SeeEngine
Overheating on page 348for more information.
FLUID
This message displays if the brake uid is low.
Check the brake uid as soon as possible
and have your vehicle serviced by your dealer.
SeeBrakes on page 357for more information.
Press and release the reset stem to acknowledge
the message and clear it from the display.
FUEL CAP
This message displays if the vehicle’s fuel cap is
either off or loose. Pull over as soon as possible
and check to see if the fuel cap is secure. You may
also see the check engine light on the instrument
panel cluster. If the check engine light does
come on when the fuel cap was loose, it may
take a few driving trips before the light turns off.
SeeMalfunction Indicator Lamp on page 192
for more information if the light still remains on.
Press and release the reset stem to acknowledge
the message and clear it from the display.
203

LOW FUEL
This message displays if the level of fuel in
the vehicle is low. Also check the fuel gage.
SeeFuel Gage on page 197for more information.
Rell the fuel tank as soon as possible.
LOW TIRE
This message displays if a low tire pressure is
detected in any of the vehicle’s tires. Press and
release the reset stem to acknowledge the message
and clear it from the display. The message appears
at each ignition cycle until the tires are inated to the
correct ination pressure. SeeTires on page 377
andInation - Tire Pressure on page 384for more
information on tires and the correct ination
pressures.
LOW TRAC (Traction)
If your vehicle has the Traction Control
System (TCS), this message displays when a
low traction condition is detected. SeeTraction
Control System (TCS) on page 253for more
information. Press and release the reset stem
to acknowledge the message and clear it from
the display.
OIL
This message displays when the oil pressure is
low. SeeOil Pressure Light on page 195and
Engine Oil on page 333for more information.
PARK BRK (Brake)
This message displays when the parking brake
is set. SeeParking Brake on page 133and
Brake System Warning Light on page 189for
more information. The message clears from the
display after the parking brake is released or
by pressing and releasing the reset stem.
REDUCED POWER
This message displays when the vehicle’s
engine power is reduced. Reduced engine power
can affect the vehicle’s ability to accelerate.
If this message is on, but there is no reduction
in performance, proceed to your destination.
The performance may be reduced the next time
the vehicle is driven. The vehicle may be driven
at a reduced speed while this message is on,
but acceleration and speed may be reduced.
204

Anytime this message stays on, the vehicle
should be taken to your dealer for service as
soon as possible. Press and release the reset
stem to acknowledge the message and clear
it from the display.
SERV (Service) 4WD
(Four-Wheel Drive)
This message displays when there is a problem
with the transfer case control system. Check the
transfer case on your vehicle and have it serviced
by your dealer. SeeFour-Wheel Drive on page 129
for more information about the transfer case. Press
and release the reset stem to acknowledge the
message and clear it from the display.
SERV (Service) TPM
(Tire Pressure Monitor)
This message displays if any of the tire monitor
sensors have malfunctioned, if the tire monitor
sensors have not been programmed, or if
the recommended tire pressures are not
programmed. The tire pressure light also ashes
for one minute and then turns on solid until
the condition goes away or the system is serviced.SeeTire Pressure Light on page 191. Press and
release the reset stem to acknowledge the
message and clear it from the display. This
message appears at each ignition cycle until the
system is serviced. See your dealer for service.
SeeTire Pressure Monitor System on page 385for
more information.
SERV (Service) VEH (Vehicle)
This message displays if your vehicle needs
service. Have your vehicle serviced by your
dealer as soon as possible.
SERVICE CHARG (Charge)
SYS (System)
This message displays if there is a problem with
the battery charging system. Under certain
conditions, the battery warning light may also turn
on in the instrument panel cluster. SeeBattery
Warning Light on page 188. The battery will not be
charging at an optimal rate and the vehicle will
lose the ability to enter the fuel economy mode.
The vehicle is safe to drive, however have
the electrical system checked by your dealer.
Press and release the reset stem to acknowledge
the message and clear it from the display.
205