1999 CADILLAC DEVILLE fuel

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2-66 Speedometer and Odometer
The speedometer lets you see your speed in both miles
per hour (mph) and kilometers per hour (km/h). The
odometer shows how far your vehicle has been driven,
in either miles (used in the United States) or kilometers
(used in Canada).
You may wonder what happens if a vehicle has to have a
new odometer installed. The new one may read the
correct mileage. This is because your vehicle's computer
has stored the mileage in memory.
Trip Odometer
Digital Cluster Analog Cluster
By pressing one of these buttons, you can tell how far
you've traveled since you last set the trip odometer back
to zero. For information on resetting these buttons, see
ªDigital or Analog Control Buttonsº in the Index.English/Metric Button
Digital Cluster Analog Cluster
With the digital and analog cluster, you can go back and
forth from English (miles) to metric (kilometers) by
pressing this button.
Note: Other readings such as temperature, fuel and
trip odometer also go back and forth between English
and metric.
Vehicle Speed Limiter
This feature prevents your vehicle from exceeding
speeds that the tires are not rated for. When this
happens, the engine's fuel supply is shut off. When the
vehicle speed slows, the fuel supply will come on again.

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2-67 Tachometer (Analog Cluster Only)
This gage indicates the
engine speed in revolutions
per minute (rpm).
NOTICE:
Do not operate the engine with the tachometer in
the red area or engine damage may occur.
Engine Speed Limiter
This feature prevents the engine from operating at too
many revolutions per minute (rpm). When the engine's
rpm are critically high, the fuel supply to the engine is shut
off. When the engine speed slows, the fuel supply will
come on again. This helps prevent damage to the engine.
Warning Lights, Gages
and Indicators
This part describes the warning lights and gages that
may be on your vehicle. The pictures will help you
locate them.
Warning lights and gages 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 gages could also save you or
others from injury.
Warning lights come 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 start the
engine just to let you know they're working. If you are
familiar with this section, you should not be alarmed
when this happens.
Gages can indicate when there may be or is a problem
with one of your vehicle's functions. Often gages and
warning lights work together to let you know when
there's a problem with your vehicle.

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2-73 Engine Coolant Temperature Gage
This gage shows the engine
coolant temperature. If
the gage pointer moves into
the red area, the engine is
too hot.
Analog Cluster
That reading means the same thing as the warning
light
-- the engine coolant has overheated. See
ªEngine Overheatingº in the Index.
Malfunction Indicator Lamp
(Service Engine Soon Light)
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 light
comes on and a chime will sound 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.

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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.
NOTICE:
Modifications made to the engine, transaxle,
exhaust 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 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.

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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.
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.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. See
ªFilling Your Tankº in the Index. It will take a few
driving trips to 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.

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2-77 Fuel Gage
Digital Cluster Analog Cluster
The fuel gage shows approximately how much fuel is in
the tank. It works only when the ignition is in RUN.On the digital cluster, if the fuel level is within
approximately 2 gallons (7.6 L) of being full, the letter
ªFº is shown. If the fuel supply gets down to
approximately 3 gallons (11.4 L), the number ª3º will
be displayed on the fuel gage, and the FUEL LEVEL
LOW message will appear on the Driver Information
Center (DIC). (On the analog fuel gage, the FUEL
LEVEL LOW message will also appear.) If the fuel
level is less than approximately 3 gallons (11.4 L) from
being empty, the letter ªEº is shown.
Here are a few concerns some owners have had about
the fuel gage. All of these situations are normal and do
not indicate that anything is wrong with the fuel gage:

At the gas station the gas pump shuts off before the
gage reads F.

It takes more (or less) gas to fill the tank than the
gage said. For example, the gage read 8 GALLONS
(30 L), but it took more (or less) than the tank's
remaining capacity to fill it.

The gage may change when you turn, stop or
speed up.

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2-78 Fuel Data Panel
Digital Cluster
For vehicles equipped with an analog cluster (not
shown), fuel data can be obtained by pressing the
SKIP INFO button. See ªAnalog Control Buttonsº
in the Index.
The fuel data panel tells you all you need to know about
the fuel economy and how far you can travel with the
fuel remaining.Press the AVG button to display the average mile per
gallon (AVG MPG). You can also display it in metric
units by pressing the ENG MET button.
When AVG MPG is selected, the total distance is
divided by the total fuel used.
When the INST button (Instantaneous Fuel Economy) is
selected, you will see what the fuel economy is at that
instant. The computer takes a new reading twice every
second. It will show economy up to 70 miles per gallon
(or 2 L per 100 km).
To reset the average fuel economy, press the
INFORMATION SKIP button until the AVG MPG is
displayed on the Driver Information Center (DIC). Press
and hold the RESET NO button until both the fuel data
center and DIC display reads 0.0.
The RANGE display shows how far the computer thinks
you can travel with the fuel that is in the tank. The
computer does not know what driving conditions will be
like for the rest of your trip, so the range is estimated
based on the recent fuel economy. Therefore, the range
reading may change as your driving habits change.
Going from city to highway driving may increase the
range reading.
If the range display shows LO, you should stop for fuel
as soon as possible.

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Driver Information Center (DIC)
This display gives you the status of many of your
vehicle's systems. The DIC is also used to display driver
personalization features and warning/status messages.
DIC Controls and Displays
Digital Control Buttons (DeVille and DeVille
d'Elegance Only)
DISPLAY ON/OFF: Pressing this button will turn off
the DIC, Electronic Climate Control (ECC), fuel data
center, the fuel gage, trip odometer and odometer. While
the displays are off, pressing the INFORMATION SKIP
button will only turn on the DIC. If the TRIP YES
button is pressed or the fuel level falls below four
gallons (15.2 L), all of the displays will come back on.
ENG/MET: You can change the display from English
(miles) to metric (kilometers) by pressing this button.
The same button also changes other readings (like
temperature, fuel and odometer).
TRIP YES: By using this button, you can tell how far
you've gone since you last set the trip display back to
zero. To reset, press and hold the button until zeros
appear. If your vehicle is domestic, the trip odometer
will return to zero after 999.9 miles (1 609 km). If your
vehicle is Canadian, the trip odometer will return to zero
after 1 999.9 km (1,242 miles).
INFORMATION SKIP: Pressing this button
repeatedly will display the MPG AVG, GAL FUEL
USED, AVG MPH, ENGINE RPM, BATTERY
VOLTS, COOLANT TEMP and OIL LIFE LEFT.