2007 CADILLAC STS fuel

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 365. 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.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 111. 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
press the 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.
254

Highbeam On Light
This light comes on
whenever the
high-beam headlamps
are on.
See “Intellibeam™ Intelligent High-Beam
Headlamp Control System” underHeadlamps on
page 211andHeadlamp High/Low-Beam
Changer on page 183for more information.
Fuel Gage
The fuel gage shows
approximately how
much fuel is in the tank.
It works only when
the engine is on.If the fuel supply gets low, the Fuel Level Low
message will appear on the DIC and a single
chime will sound. SeeDIC Warnings and
Messages on page 264for more information.
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 full.
The gage may change when you turn, stop
quickly or accelerate quickly.
It takes a little more or less fuel to ll the tank
than the gage indicated. For example, the gage
may have indicated that the tank was half full,
but it actually took a little more or less than half
the tank’s capacity to ll the tank.
257

DIC Buttons (Base Level)
If your vehicle does
not have a Head-Up
Display (HUD),
these are the
buttons for the DIC.
«4ª(Information):Press the top or bottom of
this button to scroll through the available vehicle
information displays which include digital
speed display, if your vehicle has this feature, fuel
range, fuel economy, fuel used, average speed,
timer, battery voltage, tire pressure, if your vehicle
has a Tire Pressure Monitor (TPM) system, and
engine oil life, if your vehicle has this feature.If you have an STS-V, the DIC also has additional
vehicle information displays which include engine
boost, engine oil temperature, oil pressure, and
transmission uid temperature.
See “MPH (km)” later in this section for more
information on the digital speed display.
AB
300 (Trip Information):Press the top of
this button to scroll through the odometer, trip
odometer A and trip odometer B. Press and hold
the bottom of this button to reset each trip
odometer back to zero.
4// (Reset):Press this button to reset certain DIC
features and to acknowledge DIC warning
messages and clear them from the DIC display.
EM (English/Metric):Press this button to change
the display from English to metric.
259

DIC Buttons (Uplevel)
If your vehicle has a
HUD, these are the
buttons for the DIC.
«4ª(Information):Press the top or bottom of
this button to scroll through the available vehicle
information displays which include digital speed
display, if your vehicle has this feature, fuel range,
fuel economy, fuel used, average speed, timer,
battery voltage, tire pressure, if your vehicle has a
Tire Pressure Monitor (TPM) system, engine oil life,
if your vehicle has this feature, and display units.
See “MPH (km)” later in this section for more
information on the digital speed display.
«~ª(Head-Up Display):Press this button to
change the position of the HUD on the windshield.
Press the top part of the button to move the
HUD image up. Press the bottom part of the button
to move the HUD image down.
To adjust the brightness of the HUD image, see
Head-Up Display (HUD) on page 223.
For information on adjusting the instrument panel
brightness, seeInstrument Panel Brightness
on page 220.
4// (Reset):Press this button to reset certain DIC
features and to acknowledge DIC warning
messages and clear them from the DIC display.
3(Trip Information):Press this button
to scroll through the odometer, trip odometer A
and trip odometer B. To reset each trip odometer,
either press the reset button or press and hold
the trip information button until the trip odometer
displayed returns to zero.
260

Information Display Menu Items
The following display menu items can be displayed
by pressing the information button.
MPH (km/h)
If your vehicle has this display, it shows the
vehicle’s speed digitally in either miles per
hour (mph) or kilometers per hour (km/h).
MILES RANGE (km RANGE)
This display shows the approximate number of
remaining miles (mi) or kilometers (km) you
can drive without relling the fuel tank. This
estimate is based on the current driving conditions
and will change if the driving conditions change.
For example, if you are driving in traffic making
frequent stops, the display may read one number,
but if you enter the freeway, the number may
change even though you still have the same
amount of fuel in the fuel tank. This is because
different driving conditions produce different
fuel economies. Generally, freeway driving
produces better fuel economy than city driving.
Once the range drops below about 40 miles
(64 km) remaining, the display will show
LOW RANGE.If your vehicle is low on fuel, the Fuel Level Low
message will be displayed. See “Fuel Level
Low” underDIC Warnings and Messages on
page 264for more information.
MPG AVG (L/100 km AVG)
This display shows the approximate average
miles per gallon (mpg) or liters per 100 kilometers
(L/100 km). This number is calculated based
on the number of mpg (L/100 km) recorded since
the last time this display was reset. To reset
MPG AVG, press the reset button. The display
will return to zero.
MPG INST (L/100 km INST)
This display shows the current fuel economy. This
number reects only the fuel economy that the
vehicle has right now and will change frequently as
driving conditions change. Unlike average fuel
economy, this display cannot be reset.
GAL FUEL USED (L FUEL USED)
This display shows the number of gallons (gal) or
liters (L) of fuel used since the last reset of this
display. To reset GAL FUEL USED, press
the reset button. The display will return to zero.
261

To help the generator recharge the battery quickly,
you can reduce the load on the electrical system
by turning off the accessories.
The normal battery voltage range is
11.5 to 15.5 volts. You can monitor battery voltage
on the DIC by pressing the information button
until you nd BATTERY VOLTS.
CHANGE ENGINE OIL SOON
This message displays when service is required
for your vehicle. See your dealer. SeeEngine
Oil on page 380andScheduled Maintenance on
page 505for more information.
When you reset the CHANGE ENGINE OIL
SOON message by clearing it from the display,
you still must reset the engine oil life system
separately. For more information on resetting the
engine oil life system, seeEngine Oil Life
System on page 383.
CHECK BRAKE FLUID
This message displays if the ignition is on to
inform the driver that the brake uid level is low.
Have the brake system serviced by your dealer as
soon as possible. SeeBrake System Warning
Light on page 248for more information.
CHECK GAS CAP
This message displays when the fuel cap has not
been fully tightened. Recheck the fuel cap to
ensure that it is on and tightened properly.
CHECK TIRE PRESSURE
If your vehicle has a Tire Pressure Monitor (TPM)
system, this message displays when the tire
pressure in one of the tires needs to be checked.
SeeDIC Controls and Displays on page 258
for more information on checking your vehicle’s
tire pressures. If a tire pressure message appears
on the DIC, stop as soon as you can. Have the
tire pressures checked and set to those shown on
the Tire Loading Information label. SeeTire
Pressure Monitor System on page 433and
Ination - Tire Pressure on page 431for more
information. If the tire pressure is low, the low tire
pressure warning light comes on. SeeLow Tire
Pressure Warning Light on page 249.
267

FUEL LEVEL LOW
This symbol appears
with this message.
This message displays when your vehicle is low
on fuel. Rell the fuel tank as soon as possible.
A single chime sounds when this message is
displayed.
HOOD AJAR
This symbol appears
with this message.
This message displays if the hood was not closed
completely. Make sure that the hood is closed
completely.
ICE POSSIBLE
This message displays when the outside
temperature is cold enough to create icy road
conditions. Adjust your driving accordingly.
KEY FOB BATTERY LOW
This message displays when the battery in the
keyless access transmitter is low. Replace
the battery in the transmitter. See “Battery
Replacement” underKeyless Access System
Operation on page 88.
LEFT REAR DOOR AJAR
This symbol appears
with this message.
This message displays if the driver’s side rear
door was not closed completely. Make sure that
the door is closed completely.
271

Here are some things you can check before a trip:
Windshield Washer Fluid:Is the reservoir
full? Are all windows clean inside and outside?
Wiper Blades:Are they in good shape?
Fuel, Engine Oil, Other Fluids:Have you
checked all levels?
Lamps:Are they all working? Are the
lenses clean?
Tires:They are vitally important to a safe,
trouble-free trip. Is the tread good enough
for long-distance driving? Are the tires
all inated to the recommended pressure?
Weather Forecasts:What is the weather
outlook along your route? Should you
delay your trip a short time to avoid a major
storm system?
Maps:Do you have up-to-date maps?
Highway Hypnosis
Is there actually such a condition as highway
hypnosis? Or is it just plain falling asleep at the
wheel? Call it highway hypnosis, lack of
awareness, or whatever.
There is something about an easy stretch of road
with the same scenery, along with the hum of the
tires on the road, the drone of the engine, and the
rush of the wind against the vehicle that can make
you sleepy. Do not let it happen to you! If it does,
your vehicle can leave the road in less than a
second, and you could crash and be injured.
What can you do about highway hypnosis?
First, be aware that it can happen.
Then here are some tips:
Make sure your vehicle is well ventilated, with
a comfortably cool interior.
Keep your eyes moving. Scan the road ahead
and to the sides. Check your rearview mirrors
and your instruments frequently.
If you get sleepy, pull off the road into a rest,
service, or parking area and take a nap, get
some exercise, or both. For safety, treat
drowsiness on the highway as an emergency.
341