2006 SUBARU IMPREZA fuel pressure

3
Instruments and controls
Ignition switch .................................................... 3-3
LOCK .............................................. ......................... 3-3
ACC ............................................... ........................... 3-4
ON ................................................ ............................ 3-4
START ............................................. ......................... 3-4
Key reminder chime ................................ ............... 3-5
Ignition switch light ............................. ................... 3-5
Key interlock release (AT vehicles only) .......... .... 3-5
Hazard warning flasher ............................ .......... 3-6
Meters and gauges (WRX-STI) ....................... ... 3-6
Combination meter illumination .................... ........ 3-6
Cancelling sequential illumination of the combination meter ................................. .............. 3-6
Speedometer ....................................... .................... 3-6
Odometer/Trip meter ............................... ............... 3-7
Tachometer ........................................ ..................... 3-7
Fuel gauge ........................................ ....................... 3-8
Temperature gauge ................................. ............... 3-8
Outside temperature indicator ..................... ......... 3-9
REV indicator light and buzzer (WRX-STI) ....... 3-9 Setting the alarm-level engine speed .............. ..... 3-10
Deactivating the REV alarm system ................. ..... 3-11
Meters and gauges (Except WRX-STI) ............. 3-1 1
Speedometer ....................................... .................... 3-11
Odometer/Trip meter ............................... ............... 3-11
Tachometer ........................................ ..................... 3-12
Fuel gauge ........................................ ....................... 3-12
Temperature gauge ................................. ............... 3-13
Outside temperature indicator ..................... ......... 3-13Warning and indicator lights ......................
....... 3-14
Seatbelt warning light and chime .................. ........ 3-14
SRS airbag system warning light ................... ....... 3-15
Front passenger ’s frontal airbag ON and OFF
indicators ........................................ ...................... 3-15
CHECK ENGINE warning light/Malfunction indicator lamp .................................... ................... 3-16
Charge warning light .............................. ................ 3-16
Oil pressure warning light ........................ ............. 3-16
AT OIL TEMPerature warning light (AT vehicles) ..................................... .................... 3-17
Rear differential oil temperature warning light (WRX-STI) ......................................... ..................... 3-17
ABS warning light ................................. .................. 3-17
Brake system warning light ........................ ........... 3-18
Door open warning light ........................... ............. 3-19
All-Wheel Drive warning light (AWD AT vehicles
– if equipped) ..................................... ................... 3-19
Intercooler water spray warning light (WRX-STI) ......................................... ..................... 3-19
Selector lever position indicator (AT vehicles) ... . 3-20
Turn signal indicator lights ...................... .............. 3-20
High beam indicator light ......................... .............. 3-20
Cruise control indicator light .................... ............. 3-20
Cruise control set indicator light ................ .......... 3-20
Driver ’s control center differential auto indicator
light (WRX-STI) ................................... .................. 3-20
Driver ’s control center differential indicator and
warning lights (WRX-STI) .......................... .......... 3-21
Headlight indicator light (WRX-STI) ............... ....... 3-21
REV indicator light (WRX-STI) ..................... .......... 3-21

3-16 Instruments and controls
CHECK ENGINE warn-
ing light/Malfunction in-
dicator lamp
If this light comes on steadily or blinks
while the engine is running, it may indicate
that there is a problem or potential prob-
lem somewhere in the emission control
system.
If the light comes on steadily:
If the light comes on steadily while driving
or does not go out after the engine starts,
an emission control system malfunction
has been detected.
You should have your vehicle checked by
an authorized SUBARU dealer immedi-
ately.
NOTE
This light also comes on when the fuel
filler cap is not tightened until it clicks.
If you have recently refueled your vehicle,
the cause of the CHECK ENGINE warning
light/malfunction indicator lamp coming on
could be a loose or missing fuel filler cap.
Remove the cap and retighten it until it
clicks. Make sure nothing is interfering
with the sealing of the cap. Tightening the
cap will not make the CHECK ENGINE
warning light turn off immediately. It may
take several driving trips. If the light does
not go out, take your vehicle to your au-
thorized SUBARU dealer immediately.
If the light is blinking:
If the light is blinking while driving, an en-
gine misfire condition has been detected
which may damage the emission control
system.
To prevent serious damage to the emis-
sion control system, you should do the fol-
lowing.
Reduce vehicle speed.
Avoid hard acceleration.
Avoid steep uphill grades.
Reduce the amount of cargo, if possi-
ble.
Stop towing a trailer as soon as pos-
sible. The CHECK ENGINE warning light may
stop blinking and come on steadily after
several driving trips. You should have
your vehicle checked by an authorized
SUBARU dealer immediately.
Charge warning light
If this light comes on when the engine is
running, it may indicate that the charging
system is not working properly.
If the light comes on while driving or does
not go out after the engine starts, stop the
engine at the first safe opportunity and
check the alternator belt. If the belt is
loose, broken or if the belt is in good con-
dition but the light remains on, contact
your nearest SUBARU dealer immediate-
ly.
Oil pressure warning
light
If this light comes on when the engine is
running, it may indicate that the engine oil
pressure is low and the lubricating system
is not working properly.
If the light comes on while driving or does
not go out after the engine starts, stop the
engine at the first safe opportunity and
check the engine oil level. If the oil level is
low, add oil immediately. If the engine oil
If the CHECK ENGINE light comes
on while you are driving, have your
vehicle checked/repaired by your
SUBARU dealer as soon as possi-
ble. Continued vehicle operation
without having the emission control
system checked and repaired as
necessary could cause serious
damage, which may not be covered
by your vehicle
’s warranty.

7-4 Starting and operating
Fuel filler lid and cap
Refueling0
1. To open the fuel filler lid, pull the lid re-
lease lever up. The lever is on the floor at
the left of the driver ’s seat.
1) Open
2) Close
2. Remove the fuel filler cap by turning it
slowly counterclockwise.
3. Stop filling the tank after the fuel filler
pump automatically stops. Do not add any
more fuel.
4. Put the cap back on, turn it clockwise
until you hear a clicking noise. Be certain
not to catch the tether under the cap while
tightening.
5. Close the fuel filler lid completely.
If you spill any fuel on the painted surface,
rinse it off immediately. Otherwise, the
painted surface could be damaged.
NOTE
You will see the “ ” or “FUEL
DOOR ” sign in the fuel gauge. This
indicates that the fuel filler door (lid) is
located on the right side of the vehicle.
If the fuel filler cap is not tightened
until it clicks or if the tether is caught
under the cap, the CHECK ENGINE
warning light may come on. Refer to
the “Warning and indicator lights ” sec-
tion located in chapter 3.
(Turbo model only) Promptly put fuel in
the tank whenever the low fuel warning
200209
700122
Gasoline vapor is highly flamma-
ble. Before refueling, always first
stop the engine and make sure
that there are no lighted ciga-
rettes, open flames or electrical
sparks in the adjacent area.
1
700330
When opening the cap, do not re-
move the cap quickly. Fuel may be
under pressure and spray out of
the fuel filler neck especially in
hot weather, which may cause in-
jury.

8-2 Driving tips
Driving tipsNew vehicle break-in driving – the first 1,000 miles (1,600
km)
The performance and long life of your ve-
hicle are dependent on how you handle
and care for your vehicle while it is new.
Follow these instructions during the first
1,000 miles (1,600 km):
Do not race the engine. And do not al-
low engine speed to exceed 4,000 rpm ex-
cept in an emergency.
Do not drive at one constant engine or
vehicle speed for a long time, either fast or
slow.
Avoid starting suddenly and rapid accel-
eration, except in an emergency.
Avoid hard braking, except in an emer-
gency.
The same break-in procedures should be
applied to an overhauled engine, newly
mounted engine or when brake pads or
brake linings are replaced with new ones.
Fuel economy hints
The following suggestions will help to
save your fuel.
Select the proper gear position for the
speed and road conditions.
Avoid sudden acceleration or decelera-
tion. Always accelerate gently until you
reach the desired speed. Then try to main-
tain that speed for as long as possible.
Do not pump the accelerator and avoid
racing the engine.
Avoid unnecessary engine idling.
Keep the engine properly tuned.
Keep the tires inflated to the correct
pressure shown on the tire placard, which
is located under the door latch on the driv-
er ’s side. Low pressure will increase tire
wear and fuel consumption.
Use the air conditioner only when nec-
essary.
Keep the front and rear wheels in prop-
er alignment.
Avoid carrying unnecessary luggage or
cargo.
Engine exhaust gas (Carbon
monoxide)
Never inhale engine exhaust gas.
Engine exhaust gas contains car-
bon monoxide, a colorless and
odorless gas which is dangerous,
or even lethal, if inhaled.
Always properly maintain the en-
gine exhaust system to prevent
engine exhaust gas from entering
the vehicle.
Never run the engine in a closed
space, such as a garage, except
for the brief time needed to drive
the vehicle in or out of it.
Avoid remaining in a parked vehi-
cle for a lengthy time while the en-
gine is running. If that is unavoid-
able, then use the ventilation fan
to force fresh air into the vehicle.
Always keep the front ventilator
inlet grille free from snow, leaves
or other obstructions to ensure
that the ventilation system always
works properly.

Appearance care 10-3
– CONTINUED –
with plenty of lukewarm water. Wipe the
remaining water off with a chamois or soft
cloth.
Washing the underbody
Chemicals, salts and gravel used for deic-
ing road surfaces are extremely corrosive,
accelerating the corrosion of underbody
components, such as the exhaust system,
fuel and brake lines, brake cables, floor
pan and fenders, and suspension.
Thoroughly flush the underbody and in-
side of the fenders with lukewarm or cold
water at frequent intervals to reduce the
harmful effects of such agents.
Mud and sand adhering to the underbody
components may accelerate their corro-
sion.
After driving off-road or on muddy or
sandy roads, wash the mud and sand off
the underbody. Carefully flush the sus-
pension and axle parts, as they are partic-
ularly prone to mud and sand buildup. Do
not use a sharp-edged tool to remove
caked mud.
NOTE
Be careful not to damage brake hoses,
sensor harnesses, and other parts
when washing suspension compo-
nents.
Using a warm water washer
Keep a good distance of 12 in (30 cm)
or more between the washer nozzle and
the vehicle.
Do not wash the same area continuous-
ly.
If a stain will not come out easily, wash
by hand. Some warm water washers are
of the high temperature, high pressure
type, and they can damage or deform the
resin parts such as mouldings, or cause
water to leak into the vehicle.
Waxing and polishing
Always wash and dry the vehicle before
waxing and polishing.
Use a good quality polish and wax and ap-
ply them according to the manufacturer ’s
instructions. Wax or polish when the paint-
ed surface is cool.
Be sure to polish and wax the chrome trim,
as well as the painted surfaces. Loss of
wax on a painted surface leads to loss of
the original luster and also quickens the
deterioration of the surface. It is recom-
mended that a coat of wax be applied at
least once a month, or whenever the sur-
face no longer repels water.
If the appearance of the paint has dimin-
ished to the point where the luster or tone cannot be restored, lightly polish the sur-
face with a fine-grained compound. Never
polish just the affected area, but include
the surrounding area as well. Always pol-
ish in only one direction. A No. 2000 grain
compound is recommended. Never use a
coarse-grained compound. Coarser
grained compounds have a smaller grain-
size number and could damage the paint.
After polishing with a compound, coat with
wax to restore the original luster. Frequent
polishing with a compound or an incorrect
polishing technique will result in removing
the paint layer and exposing the under-
coat. When in doubt, it is always best to
contact your SUBARU dealer or an auto
paint specialist.
NOTE
Be careful not to block the windshield
washer nozzles with wax when waxing
the vehicle.
Cleaning aluminum wheels
Promptly wipe the aluminum wheels
clean of any kind of grime or agent. If dirt
is left on too long, it may be difficult to
clean off.
Do not use soap containing grit to clean
the wheels. Be sure to use a neutral clean-
ing agent, and later rinse thoroughly with
water. Do not clean the wheels with a stiff

Maintenance and service 11-3
– CONTINUED –
Maintenance and serviceMaintenance schedule
The scheduled maintenance items re-
quired to be serviced at regular intervals
are shown in the “Warranty and Mainte-
nance Booklet ”.
For details of your maintenance schedule,
read the separate “Warranty and Mainte-
nance Booklet ”.
Maintenance precautions
When maintenance and service are re-
quired, it is recommended that all work be
done by an authorized SUBARU dealer.
If you perform maintenance and service
by yourself, you should familiarize your-
self with the information provided in this
section on general maintenance and ser-
vice for your SUBARU.
Incorrect or incomplete service could
cause improper or unsafe vehicle opera-
tion. Any problems caused by improper
maintenance and service performed by
you are not eligible for warranty coverage.
Testing of an All-Wheel Drive ve-
hicle must NEVER be performed
on a single two-wheel dynamome-
ter or similar apparatus. Attempt-
ing to do so will result in transmis-
sion damage and in uncontrolled
vehicle movement and may cause
an accident or injuries to persons
nearby.
Always select a safe area when
performing maintenance on your
vehicle.
Always be very careful to avoid in-
jury when working on the vehicle.
Remember that some of the mate-
rials in the vehicle may be hazard-
ous if improperly used or handled,
for example, battery acid.
Your vehicle should only be ser-
viced by persons fully competent
to do so. Serious personal injury
may result to persons not experi-
enced in servicing vehicles.
Always use the proper tools and
make certain that they are well
maintained.
Never get under the vehicle sup-
ported only by a jack. Always use
a safety stands to support the ve-
hicle.
Never keep the engine running in
a poorly ventilated area, such as a
garage or other closed areas.
Do not smoke or allow open
flames around the fuel or battery.
This will cause a fire.
Because the fuel system is under
pressure, replacement of the fuel
filter should be performed only by
your SUBARU dealer.

11-12 Maintenance and service
Cooling system
Cooling fan, hose and con-
nections
Your vehicle employs an electric cooling
fan which is thermostatically controlled to
operate when the engine coolant reaches
a specific temperature.
If the radiator cooling fan does not operate
even when the engine coolant tempera-
ture gauge exceeds the normal operating
range, the cooling fan circuit may be de-
fective. Check the fuse and replace it if
necessary. If the fuse is not blown, have
the cooling system checked by your
SUBARU dealer.
If frequent addition of coolant is neces-
sary, there may be a leak in the engine
cooling system. It is recommended that
the cooling system and connections be
checked for leaks, damage, or looseness.
Engine coolant
Checking the coolant level
1)“FULL ” level mark
2) “LOW ” level mark
Check the coolant level at each fuel stop.
1. Check the coolant level on the outside
of the reservoir while the engine is cool.
2. If the level is close to or lower than the “ LOW ” level mark, add coolant up to the
“ FULL ” level mark. If the reserve tank is
empty, remove the radiator cap and refill
as required.
Never attempt to remove the radia-
tor cap until the engine has been
shut off and has cooled down com-
pletely. Since the coolant is under
pressure, you may suffer serious
burns from a spray of boiling hot
coolant when the cap is removed.
The cooling system has been
filled at the factory with a high
quality, corrosion-inhibiting, year-
around coolant which provides
protection against freezing down
to –33 F ( –36 C). For adding, use
genuine SUBARU coolant or an
equivalent: a mixture of 50% soft
water and 50% ethylene-glycol ba-
sis coolant. Use of improper cool-
ants may result in corrosion in the
cooling system. It is important to
maintain protection against freez-
ing and corrosion, even if freezing
temperatures are not expected.
Never mix different kinds of cool-
ant.
Do not splash the engine coolant
over painted parts. The alcohol
contained in the engine coolant
may damage the paint surface.
F U L L
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11-30 Maintenance and service
Tires and wheels
Types of tires
You should be familiar with type of tires
present on your vehicle.
The factory-fitted 17-inch tires on the
WRX-STI are summer tires. The factory-
fitted tires on other versions are all-sea-
son tires.
All season tires
All season tires are designed to provide
an adequate measure of traction, handling
and braking performance in year-round
driving including snowy and icy road con-
ditions. However all season tires do not of-
fer as much traction performance as win-
ter (snow) tires in heavy or loose snow or
on icy roads.
All season tires are identified by “ALL
SEASON ” and/or “M+S ” (Mud & Snow) on
the tire sidewall.
Summer tires
Summer tires are high-speed capability
tires best suited for highway driving under
dry conditions.
Summer tires are inadequate for driving
on slippery roads such as on snow-cov-
ered or icy roads.
If you drive your vehicle on snow-covered
or icy roads, we strongly recommend the use of winter (snow) tires.
When installing winter tires, be sure to re-
place all four tires.
Winter (snow) tires
Winter tires are best suited for driving on
snow-covered and icy roads. However
winter tires do not perform as well as sum-
mer tires and all season tires on roads oth-
er than snow-covered and icy roads.
Tire inspection
Check on a daily basis that the tires are
free from serious damage, nails, and
stones. At the same time, check the tires
for abnormal wear.
Contact your SUBARU dealer immediate-
ly if you find any problem.
NOTE
When the wheels and tires strike
curbs or are subjected to harsh treat-
ment as when the vehicle is driven on a
rough surface, they can suffer damage
that cannot be seen with the naked eye.
This type of damage does not become
evident until time has passed. Try not
to drive over curbs, potholes or on oth-
er rough surfaces. If doing so is un-
avoidable, keep the vehicle ’s speed
down to a walking pace or less, and ap-
proach the curbs as squarely as possi- ble. Also, make sure the tires are not
pressed against the curb when you
park the vehicle.
If you feel unusual vibration while
driving or find it difficult to steer the ve-
hicle in a straight line, one of the tires
and/or wheels may be damaged. Drive
slowly to the nearest authorized
SUBARU dealer and have the vehicle
inspected.
Tire pressures and wear
Maintaining the correct tire pressures
helps to maximize the tires ’ service lives
and is essential for good running perfor-
mance. Check and, if necessary, adjust
the pressure of each tire (including the
spare) at least once a month (for example,
during a fuel stop) and before any long
journey.