2003 SUBARU IMPREZA WRX engine

Climate control
4-12
Cooling and dehumidifying in high humidity and low temperatureweather conditions
Under certain weather conditions (high relative hu-
midity, low temperatures, etc.) a small amount of wa-
ter vapor emission from the air outlets may be not-
iced. This condition is normal and does not indicate
any problem with the air conditioning system. Air conditioner compressor shut-off when engine is heavily loaded
To improve acceleration and gas mileage, the air
conditioner compressor is designed to temporarily
shut off during air conditioner operation whenever
the accelerator is fully depressed such as duringrapid acceleration or when driving on a steepupgrade. Refrigerant for your climate control system
Your air conditioner uses ozone friendly refrigerant
HFC134a. Therefore, the method of adding, chang-
ing or checking the refrigerant is different from the
method for CFC12 (Freon). Consult your SUBARU
dealer for service. Repairs needed as a result of using the wrong refrigerant are not covered under
warranty.

Interior equipment
6-9
– CONTINUED –
CAUTION
Do not attempt to use a cigarette lighter in
the accessory power outlet. Do not place any foreign objects, especially
metal ones such as coins or aluminum foil, into the accessory power outlet. That could
cause a short circuit. Always put the cap onthe accessory power outlet when it is not inuse. Use only electrical appliances which are
designed for 12V DC and which consume less
than 120W. Overloading the accessory poweroutlet can cause a short circuit. Do not use
double adapters or more than one electricalappliance. If the plug on your electric appliance is
either too loose or too tight for the accessory power outlet, this can result in a poor contactor cause the plug to get stuck. Only use plugs
that fit properly. Use of an electric appliance in the acces-
sory power outlet for a long period of timewhile the engine is not running can cause bat-tery discharge. Cigarette lighter socket
The electrical power outlet located on the lower part
of the instrument panel can be used as cigarette
lighter socket. A cigarette lighter plug is an optional
accessory. It is available from your SUBARU dealer.
The cigarette lighter socket may also be used as a
power source for an in-car use electrical appliance.
CAUTION

The electrical power outlet located on the
lower part of the instrument panel is originally
designed to use a SUBARU genuine cigarette

Interior equipment
6-11
– CONTINUED –
CAUTION
Do not hold the lighter pushed in, because it will overheat.
Using as an accessory power outlet
Electrical power (12V DC) from the battery is on tapat the socket when the ignition switch is either in the
“ACC” or “ON” position.
If you use the socket as an accessory power outlet,
take the following precautions.When the socket is not in use, always put the cap on
the socket to prevent any foreign object from enter-ing it.
CAUTION
Use only in-car use electrical appliances
which are designed for 12V DC and which
consume less than 120W. Overloading the
socket can cause a short circuit. Do not use
double adapters or more than one electrical appliance. If the plug on your electric appliance is ei-
ther too loose or too tight for the socket, this
can result in a poor contact or cause the plug to get stuck. Only use plugs that fit properly.
Use of an electric appliance in the socket for
a long period of time while the engine is notrunning can cause battery discharge. Before driving your vehicle, make sure that
the plug and the cord on your electrical ap-
pliance will not interfere with your shifting gears and operating the accelerator and brake
pedals. If they do, do not use the electrical ap-
pliance while driving.
If the socket has been used for electrical ap-
pliances, damage may have been done to the inter-
nal mechanism that causes a cigarette lighter to“ pop out ” after its element has been heated. For that
reason, a cigarette lighter, even if it is a genuine
part, should not be used in the socket. If you want to
use the socket for a cigarette lighter again, or to pro-
tect your purchaser before you sell your car, have
your SUBARU dealer replace the socket with a newone.

7
7-1
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Fuel 7-2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel requirements 7-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel filler lid and cap 7-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
State emission testing (U.S. only) 7-6 . . . . . . . . . . . . .
Preparing to drive 7-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting the engine 7-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual transmission vehicle 7-9 . . . . . . . . . . . . . . . . . . . .
Automatic transmission vehicle 7-9 . . . . . . . . . . . . . . . .
Starting the engine during cold weather
below –4 °F ( –20 °C) 7-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting a flooded engine 7-10 . . . . . . . . . . . . . . . . . . . . . . . .
Stopping the engine 7-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual transmission 7-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shifting speeds 7-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driving tips 7-13
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic transmission 7-14 . . . . . . . . . . . . . . . . . . . . . . . . . .
Selector lever for automatic transmission 7-15 . . . .
Shift lock release 7-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear viscous limited slip differential
(LSD) (WRX) 7-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power steering 7-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Braking 7-22
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Braking tips 7-22
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake system 7-22
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disc brake pad wear warning indicators 7-23 . . . . . .
ABS (Anti-lock Brake System) 7-23 . . . . . . . . . . . . . . . . .
ABS system self-check 7-24 . . . . . . . . . . . . . . . . . . . . . . . . . . .
ABS warning light 7-24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Parking your vehicle 7-26
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parking brake 7-26
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parking tips 7-26
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cruise control (if equipped) 7-28 . . . . . . . . . . . . . . . . . . . . .
To set cruise control 7-29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
To temporarily cancel the cruise control 7-30 . . . . . .
To turn off the cruise control 7-30 . . . . . . . . . . . . . . . . . . . .
To change the cruising speed 7-30 . . . . . . . . . . . . . . . . . . .
Starting and operating

Starting and operating
7-2
Fuel
CAUTION
Use of a fuel which is low in quality or use of an inappropriate fuel additive may cause en- gine damage.
Fuel requirements
2.5 Liter models
The 2.5 Liter engine is designed to operate using
unleaded gasoline with an octane rating of 87 AKI or
higher.
2.0 Liter (turbo) models
The 2.0 Liter turbo engine is designed to operate
using premium unleaded gasoline with an octane
rating of 91 AKI or higher. If premium unleaded gas-
oline is not available, regular unleaded gasoline with an octane rating of 87 AKI or higher may be tempo-
rarily used. For optimum engine performance and
driveability, it is recommended that you use pre-
mium grade unleaded gasoline.
Fuel octane rating
This octane rating is the average of the ResearchOctane and Motor Octane numbers and is com-
monly referred to as the Anti Knock Index (AKI).Using a gasoline with a lower octane rating cancause persistent and heavy knocking, which can
damage the engine. Do not be concerned if your
vehicle sometimes knocks lightly when you drive up a hill or when you accelerate. See your dealer or a
qualified service technician if you use a fuel with thespecified octane rating and your vehicle knocks
heavily or persistently.
Unleaded gasoline
The neck of the fuel filler pipe is designed to acceptonly an unleaded gasoline filler nozzle. Under no
circumstances should leaded gasoline be used be-
cause it will damage the emission control system
and may impair driveability and fuel economy.
Gasoline for California-certified LEV
Your vehicle was certified to California ’s low emis-
sion vehicle (LEV) standards as indicated on the
underhood tune-up label. It is designed to optimize
engine and emission performance with gasoline that
meets the clean burning low-sulfur California gaso-
line specifications. If you live in any other state than
California, your vehicle will operate on gasoline

Starting and operating
7-3
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meeting Federal specifications. Gasoline sold out-
side California is permitted to have higher sulfur lev-
els, which may affect the performance of your ve-
hicle’s catalytic converter and may produce a sulfur
exhaust odor or smell. SUBARU recommends that
you try a different brand of unleaded gasoline hav-
ing lower sulfur to determine if the problem is fuel
related before returning your vehicle to an autho-rized dealer for service.
Gasoline for cleaner air
Your use of gasoline with detergent additives will
help prevent deposits from forming in your engine
and fuel system. This helps keep your engine in
tune and your emission control system working
properly, and is a way of doing your part for cleaner
air. If you continuously use a high quality fuel with
the proper detergent and other additives, youshould never need to add any fuel system cleaning agents to your fuel tank.
Many gasolines are now blended with materials
called oxygenates. Use of these fuels can also help
keep the air cleaner. Oxygenated blend fuels, such
as MTBE (Methyl Tertiary Butyl ether) or ethanol
(ethyl or grain alcohol) may be used in your vehicle,
but should contain no more than 15% MTBE or 10%
ethanol for the proper operation of your SUBARU. In addition, some gasoline suppliers are now pro-
ducing reformulated gasolines, which are designed
to reduce vehicle emissions. SUBARU approves the
use of reformulated gasoline.
If you are not sure what the fuel contains, you should
ask your service station operators if their gasolines
contain detergents and oxygenates and if they have
been reformulated to reduce vehicle emissions.
As additional guidance, only use fuels suited for
your vehicle as explained below.
Fuel should be unleaded and have an octane rat-
ing no lower than that specified in this manual. Methanol (methyl or wood alcohol) is sometimes
mixed with unleaded gasoline. Methanol can beused in your vehicle ONLY if it does not exceed 5%
of the fuel mixture AND if it is accompanied by suffi-
cient quantities of the proper cosolvents and corro-
sion inhibitors required to prevent damage to the
fuel system. Do not use fuel containing methanolEXCEPT under these conditions.
If undesirable driveability problems are experi-
enced and you suspect they may be fuel related, try
a different brand of gasoline before seeking service
at your SUBARU dealer. Fuel system damage or driveability problems
which result from the use of improper fuel are not

Starting and operating
7-5
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1) Open 2) Close
2. Remove the fuel filler cap by turning it slowly
counterclockwise.
WARNING
Gasoline vapor is highly flammable. Before
refueling, always first stop the engine and
make sure that there are no lighted cigarettes,open flames or electrical sparks in the adja-cent area. When opening the cap, do not remove the
cap quickly. Fuel may be under pressure and spray out of the fuel filler neck especially in
hot weather, which may cause injury.
3. Stop filling the tank after the fuel filler pump auto-
matically 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 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. Re-fer to the “Warning and indicator lights ” section
located in chapter 3.CAUTION
Never add any cleaning agents to the fuel
tank. The addition of a cleaning agent may
cause damage to the fuel system. Make sure that the cap is tightened until it
clicks to prevent fuel spillage in the event of an accident.

Starting and operating
7-7
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and states using two-wheel dynamometers in their
emission testing programs have EXEMPTED
Subaru AWD vehicles from the portion of the testing
program that involves a two-wheel dynamometer.
There are some states that use four-wheel
dynamometers in their testing programs. When
properly used, that equipment will not damage an
AWD Subaru vehicle.
Under no circumstances should the rear wheels be
jacked off the ground, nor should the driveshaft be
disconnected for state emission testing.
WARNING
Testing of an All-Wheel Drive vehicle must
NEVER be performed on a single two-wheel
dynamometer. Attempting to do so will result in uncontrolled vehicle movement and may
cause an accident or injuries to persons
nearby.
CAUTION
Resultant vehicle damage due to improper testing is not covered under the SUBARU Lim-
ited Warranty and is the responsibility of the state inspection program or its contractors orlicensees.
The EPA has issued regulations for inspecting the
On-Board Diagnostic (OBD) system as part of the state emissions inspection. The OBD system is de-
signed to detect engine and transmission problemsthat might cause vehicle emissions to exceed allow-able limits. These inspections apply to all 1996 mod-el year and newer passenger cars and light trucks.
Several states plus the District of Columbia have
opted to start the OBD system inspection prior to
the required EPA regulation effective date of January1, 2002. Other states will add OBD system inspec-
tion in 2002. The inspection of the OBD system consists of a
visual operational check of the “CHECK ENGINE ”
warning light/malfunction indicator lamp (MIL) and
an examination of the OBD system with an electron-ic scan tool while the engine is running. A vehicle passes
the OBD system inspection if
proper the “CHECK ENGINE ” warning light/MIL illu-