SUBARU IMPREZA WRX 2002 2.G Owners Manual

Maintenance and service
11-4
Always be very careful to avoid injury when
working on the vehicle. Remember that some of the materials in the vehicle may be hazard-
ous if improperly used or handled, for exam-ple, battery acid. Your vehicle should only be serviced by per-
sons fully competent to do so. Serious per-sonal injury may result to persons not experi-enced in servicing vehicles. Always use the proper tools and make cer-
tain that they are well maintained. Never get under the vehicle supported only
by a jack. Always use a safety stands to sup-port the vehicle. 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 per-
formed only by your SUBARU dealer. Ensure your eyes are free of oil and fluid, as
they can be harmful to your eyes. If you get one in your eyes, wash your eyes with clean
water. For your safety, you are wise to weareye protection.
Do not tamper with the wiring of the SRS
airbag system or seatbelt pretensioner sys-tem, or attempt to take its connectors apart,as that may activate the system or it can ren-der it inoperative. The wiring and connectorsof these systems are yellow for easy identifi- cation. NEVER use a circuit tester for these wiring. If your SRS airbag or seatbelt pretensionerneeds service, consult your nearest SUBARU
dealer. Before checking or servicing in the
engine compartment
Always stop the engine and set the parking
brake firmly to prevent the vehicle from mov- ing. Always let the engine cool down. Engine
parts become very hot when the engine is run-
ning and remain hot for some time after theengine is stopped. Do not spill engine oil, engine coolant, brake
fluid or any other fluid on hot engine compo-nents. This may cause a fire. Always remove the key from the ignition
switch. When the ignition switch is in the

Maintenance and service
11-5
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“ON” position, the cooling fan may operate
suddenly even when the engine is stopped. When you do checking or servicing in the engine compartment whilethe engine is running
A running engine can be dangerous. Keep your fingers, hands, clothing, hair and toolsaway from the cooling fan, belts and any other
moving engine parts. Removing rings, watches and ties is advisable. Engine hood
To open the hood:
HBB001BA
1. Pull the hood release knob under the instrument panel.

Maintenance and service
11-6
HGB000BA
2. Release the secondary hood release located
under the front grille by moving the lever toward theleft.
HBB003BA
Lift up the hood, release the hood prop from its
retainer and put the end of the hood prop into theslot in the hood.
To close the hood:
1. Lift the hood slightly and remove the hood prop
from the slot in the hood and return the prop to its
retainer.
2. Lower the hood until it approaches about 6 in.
(15 cm) from the closed position and let it drop.
3. After closing the hood, be sure the hood is
securely locked.
If this does not close the hood, release it from a
slightly higher position. Do not push the hood forci-
bly to close it. It could deform the metal.
WARNING
Always check that the hood is properly locked before you start driving. If it is not, it might flyopen while the vehicle is moving and block
your view, which may cause an accident and
serious bodily injury.

Maintenance and service
11-7
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Engine compartment overview 2.5 liter model
HGB004BB
1) Manual transmission oil level gauge
(MT) (page 11-23) or Differential
gear oil level gauge (AT) (page 11-26)
2) Air cleaner element (page 11-18)
3) Clutch fluid reservoir (page 11-31)
4) Automatic transmission fluid level gauge (page 11-24)
5) Brake fluid reservoir (page 11-30)
6) Windshield washer tank (page
11-46)
7) Fuse box (page 11-51)
8) Battery (page 11-50)
9) Engine oil filler cap (page 11-9)
10) Engine coolant reservoir (page 11-14)
11) Radiator cap (page 11-14)
12) Engine oil level gauge (page 11-9)
13) Power steering fluid reservoir (page 11-29)

Maintenance and service
11-8
2.0 liter (Turbo) model
HGB005BB
1) Manual transmission oil level
gauge (MT) (page 11-23)
2) Air cleaner element (page
11-18)
3) Clutch fluid reservoir (page
11-31)
4) Brake fluid reservoir (page 11-30)
5) Windshield washer tank (page 11-46)
6) Fuse box (page 11-51)
7) Battery (page 11-50)
8) Engine oil filler cap (page 11-9)
9) Engine coolant reservoir (page
11-14)
10) Engine oil level gauge (page 11-9)
11) Radiator cap (page 11-14)
12) Power steering fluid reservoir
(page 11-29)
1110

Maintenance and service
11-9
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Engine oil Checking the oil level
Check the engine oil level at each fuel stop.
1. Park the vehicle on a level surface and stop theengine.
2. Pull out the dipstick, wipe it clean, and insert itagain.
HGB001BA
3. Be sure the dipstick is correctly inserted until it
stops with the graphic symbol i on its top ap-
pearing as shown in the illustration.
HBB061BC
1) Notch
2) Upper level 3) Lower level
4) Front of vehicle
4. Pull out the dipstick again and check the oil level on it. If it is below the lower level, add oil to bring the level up to the upper level.
CAUTION
Use only engine oil with the recommended
grade and viscosity.
If you check the oil level just after stopping the en-
gine, wait a few minutes for the oil to drain back into
the oil pan before checking the level.
Just after driving or while the engine is warm, the

Maintenance and service
11-10
engine oil level reading may be in a range between the upper level and the notch mark. This is caused
by thermal expansion of the engine oil.
To prevent overfilling the engine oil, do not add any
additional oil above the upper level when the engineis cold. Changing the oil and oil filter
Change the oil and oil filter according to the mainte-
nance schedule in the “Warranty and Maintenance
Booklet”.
The engine oil and oil filter must be changed more
frequently than listed in the maintenance schedule
when driving on dusty roads, when short trips are
frequently made, or when driving in extremely cold
whether.
1. Warm up the engine by letting the engine idle for
about 10 minutes to ease draining the engine oil.
2. Park the vehicle on a level surface and stop the engine.
3. Remove the oil filler cap.
OM-H2283
1) Sealing washer
2) Drain plug
4. Drain out the engine oil by removing the drain
plug while the engine is still warm. The used oil
should be drained into an appropriate container and
disposed of properly.
WARNING
Be careful not to burn yourself with hot en- gine oil.

Maintenance and service
11-11
– CONTINUED –
5. Wipe the seating surface of the drain plug with a
clean cloth and tighten it securely with a new seal-ing washer after the oil has completely drained out.
HS0176
1) Oil filter
6. Remove the oil filter with an oil filter wrench.
7. Before installing a new oil filter, apply a thin coat of engine oil to the seal.
8. Clean the rubber seal seating area of the lower
crank case and install the oil filter by hand turning.
Be careful not to twist or damage the seal.
9. Tighten it approximately two-thirds of a turn afterthe seal makes contact with the lower crank case.
CAUTION
Never over tighten the oil filter because that can result in an oil leak.
10. Pour the specified amount of engine oil throughthe filler neck.
Oil capacity: Non-turbo models: 4.2 US qt (4.0 liters, 3.5 Imp qt)
Turbo models: 4.8 US qt (4.5 liters, 4.0 Imp qt)
11. Start the engine and make sure that no oil leaks
appear around the filter ’s rubber seal.
12. Run the engine until it reaches the normal oper-
ating temperature. Then stop the engine and wait a
few minutes to allow the oil drain back. Check the oil
level again and if necessary, add more engine oil. Recommended grade and viscosity
CAUTION
Use only engine oil with the recommended
grade and viscosity.

Maintenance and service
11-12
Oil grade:API classification SJ or SH with the words “ENERGY CONSERVING II ” (if you cannot obtain
the oil with SJ or SH grade, you may use SG grade oil.) or the new API certification mark (Starburst mark)
displayed on the container.
HGB018BB
API Service label
1) Indicates the oil quality by API designa- tions
2) Indicates the SAE oil viscosity grade
3) Indicates that the oil has fuel saving capabilities
HGB019AA
New API Certification Mark (Starburst Mark)
In choosing an oil, you want the proper quality and
viscosity, as well as one that will add to fuel econo-
my. The following table lists the recommended vis-
cosities and applicable temperatures.
When adding oil, different brands may be used to-
gether as long as they are the same API classifica-
tion and SAE viscosity as those recommended by SUBARU.
Engine oil viscosity (thickness) affects fuel economy.
Oils of lower viscosity provide better fuel economy.
However, in hot weather, oil of higher viscosity is re-
quired to properly lubricate the engine.

Maintenance and service
11-13
– CONTINUED –
HGB032BB
SAE viscosity number and applicable temperature
1) 5W-30, SAE 5W-30 preferred
2) 10W-30, 10W-40
Recommended grade and viscosity under severe driving conditions
If the vehicle is used in desert areas, in areas with
very high temperatures, or used for heavy-duty ap-
plications such as a towing a trailer, use of oil with
the following grade and viscosities is recom-mended.
API classification SJ or SH: SAE viscosity No.: 30, 40, 10W-50, 20W-40,
20W-50
Cooling system
WARNING
Never attempt to remove the radiator cap until the engine has been shut off and has cooled
down completely. Since the coolant is underpressure, you may suffer serious burns from a
spray of boiling hot coolant when the cap isremoved.
CAUTION
The cooling system has been filled at the
factory with a high quality, corrosion-inhibit-
ing, 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 basis cool-
ant. Use of improper coolants may result in
corrosion in the cooling system. It is impor- tant to maintain protection against freezing and corrosion, even if freezing temperaturesare not expected. Never mix different kinds ofcoolant.