2001 GMC SAVANA service

2-60 Malfunction Indicator Lamp
(Service Engine Soon Light in the United
States or Check Engine Light in Canada)
(4.3L, 5.0L & 5.7L Engines and
8.1L California Gasoline Engine)
United States Canada
Your vehicle is equipped with 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 SERVICE ENGINE SOON or
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 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.

2-61
NOTICE:
Modifications 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 may cause the SERVICE ENGINE SOON or
CHECK ENGINE light to come on.
Modifications to these systems could lead to
costly repairs not covered by your warranty.
This may also result in a failure to pass a
required Emission Inspection/Maintenance test.
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:

Light Flashing
-- A misfire condition has been
detected. A misfire increases vehicle emissions and
may damage the emission control system on your
vehicle. Dealer or qualified service center diagnosis
and service may be required.
Light On Steady
-- An emission control system
malfunction has been detected on your vehicle.
Dealer or qualified service center 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 possible.
If the light stops flashing and remains on steady,
see ªIf the Light Is On Steadyº 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 ªIf the Light
Is On Steadyº following. If the light is still flashing,
follow the previous steps, and drive the vehicle to your
dealer or qualified service center for service.

2-62
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. See ªFilling Your Tankº in the Index. 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.Have you recently changed brands of fuel?
If so, be sure to fuel your vehicle with quality fuel. See
ªFuelº 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.

2-63
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 in order to help
your vehicle pass an inspection:
Your vehicle will not pass this inspection if the
SERVICE ENGINE SOON or 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, see your dealer or qualified service center to
prepare the vehicle for inspection.
Malfunction Indicator Lamp (Service
Engine Soon Light) (Check Engine Light)
(8.1L Gasoline Engine -- Except California)
United States Canada
If this light comes on or flashes while you are driving,
two things may happen.
First, you won't notice any difference in engine
performance, but your tail pipe emissions may increase.
Second, your engine may not run properly or may stall
without warning. If either of these things happen, drive
or tow your vehicle to your dealer for service.
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 repaired.

2-65
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.
NOTICE:
Damage to your engine from neglected oil
problems can be costly and is not covered by
your warranty.
Security Light
This light will come on
briefly when you turn the
ignition key to START.
The light will stay on until the engine starts. If the light
flashes, the Passlock

System has entered a tamper
mode. If the vehicle fails to start, see ªPasslockº 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.

3-13
Adjusting the Speakers
BALANCE: Press and release AUDIO until BAL
appears on the display. Then press and hold the up arrow
to move the sound to the right speakers or the down
arrow to move the sound to the left speakers. ªRº and a
number will appear on the display when the sound is
balanced toward the right speakers. ªLº and a number
will appear on the display when the sound is balanced
toward the left speakers. L and a zero will appear on the
display when the the sound is balanced between the
speakers. Release the up or down arrow when you find
the speaker balance you want or when the maximum or
minimum level is reached.
FADE: Press and release AUDIO until FAD appears on
the display. Then press and hold the up arrow to move
the sound to the front speakers or the down arrow to
move the sound to the rear speakers. ªFº and a number
will appear on the display when the sound is balanced
toward the front speakers. ªRº and a number will appear
on the display when the sound is balanced toward the
rear speakers. F and a zero will appear on the display
when the the sound is balanced between the speakers.
Release the up or down arrow when you find the speaker
balance you want or when the maximum or minimum
level is reached.To set BALANCE or FADE to the middle position,
select the desired speaker control. Then press and hold
AUDIO for more than two seconds until you hear a
beep. L and a zero or F and a zero will appear on the
display. To set all of the tone controls and speaker
controls to the middle position, end out of audio mode.
Then press and hold AUDIO for more than two seconds
until you hear a beep. CEN will appear on the display.
Radio Calibration
Your audio system has been calibrated for your vehicle
from the factory. If CAL appears on the display it means
that your radio has not been configured properly for
your vehicle and must be returned to the dealership
for service.
LOC: This message is displayed when the
THEFTLOCK

system has locked up. Your vehicle
must be returned to the dealership for service.

3-18
RPT (6): Press this button once to hear a selection over
again. RPT will appear on the display. The current
selection will continue to repeat. RPT will flash on the
display while the cassette player is searching for the
start of the selection. Your tape must have at least
three seconds of silence between each selection for RPT
to work. Press this button again to turn off repeated play.
OFF will appear on the display.
AM FM: Press this button to play the radio when
a tape is in the player. The tape will stop but remain in
the player.
TAPE: With a cassette tape in the player and the radio
playing, press this button to play a cassette tape. CAS
will appear on the display. Press AM FM to return to the
radio when a cassette tape is playing. The inactive tape
will remain safely inside the radio for future listening.
In order to use a portable CD player adapter or a cassette
tape head cleaner you must disable the TIGHT/LOOSE
TAPE sensor. Press and hold the TAPE button for two
seconds with the radio off and the vehicle on. CAS will
flash on the display showing the TIGHT/LOOSE TAPE
sensor has been disabled. The feature will remain
disabled until the tape is ejected.: Press this button to remove a tape. The radio will
play. Eject may be activated with the radio off. Cassette
tapes may be loaded with the radio and vehicle off if this
button is pressed first.
CLN: If this message appears on the display, the
cassette tape player needs to be cleaned. It will still play
tapes, but you should clean it as soon as possible to
prevent damage to the tapes and player. See ªCare of
Your Cassette Tape Playerº in the Index. After you clean
the player, press and hold the eject button for five
seconds to reset the CLN indicator. The radio display
will flash
--- to show the indicator was reset.
Radio Calibration
Your audio system has been calibrated for your vehicle
from the factory. If CAL appears on the display it means
that your radio has not been configured properly for
your vehicle and must be returned to the dealership
for service.
LOC: This message is displayed when the
THEFTLOCK

system has locked up. Your vehicle
must be returned to the dealership for service.

3-23
Radio Calibration
Your audio system has been calibrated for your vehicle
from the factory. If CAL appears on the display it means
that your radio has not been configured properly for
your vehicle and must be returned to the dealership
for service.
LOC: This message is displayed when the
THEFTLOCK

system has locked up. Your vehicle
must be returned to the dealership for service.
AM-FM Stereo with Cassette Tape and
Compact Disc Player with Radio Data
System (RDS) and Automatic Tone Control
(If Equipped)
Playing the Radio
PWR: Press this button to turn the system on and off.
VOL: Turn this knob clockwise to increase volume.
Turn it counterclockwise to decrease volume.
DISP: Press this button to display the clock with the
ignition off. Press this button to display an RDS station
frequency or program type when the radio is on.