ECU SUBARU IMPREZA 2003 2.G Service Manual

Driving tips
8-36
safety’s sake, you should employ extra cau-
tion when towing a trailer and you should
never speed. You should also keep the follow-ing tips in mind:
Before starting out on a trip
Check that the vehicle and vehicle-to-hitch mount-
ing are in good condition. If any problems are
apparent, do not tow the trailer. Check that the vehicle sits horizontally with the
trailer attached. If the vehicle is tipped sharply up at
the front and down at the rear, check the total trailer
weight, GVW, GAWs and tongue load again, then
confirm that the load and its distribution are accept-able. Check that the tire pressures are correct.
Check that the vehicle and trailer are connected
properly. Confirm that
–the trailer tongue is connected properly to the
hitch ball.– the trailer lights connector is connected prop-
erly and trailer ’s brake lights illuminate when the
vehicle’ s brake pedal is pressed, and that the trail-
er’ s turn signal lights flash when the vehicle ’s turn
signal lever is operated.– the safety chains are connected properly. –
all cargo in the trailer is secured safety in posi-
tion.– the side mirrors provide a good rearward field of
view without a significant blind spot.
Sufficient time should be taken to learn the “feel”
of the vehicle/trailer combination before starting out
on a trip. In an area free of traffic, practice turning, stopping and backing up.
Driving with a trailer
You should allow for considerably more stopping
distance when towing a trailer. Avoid sudden brak-
ing because it may result in skidding or jackknifing
and loss of control. Avoid abrupt starts and sudden accelerations. If
your vehicle has a manual transmission, always start
out in first gear and release the clutch at moderate
engine revolution. Avoid uneven steering, sharp turns and rapid lane
changes. Slow down before turning. Make a longer than
normal turning radius because the trailer wheels will
be closer than the vehicle wheels to the inside of the
turn. In a tight turn, the trailer could hit your vehicle. Crosswinds will adversely affect the handling of
your vehicle and trailer, causing sway. Crosswindscan be due to weather conditions or the passing of

In case of emergency
9-5
– CONTINUED –
Flat tires
If you have a flat tire while driving, never brake sud- denly; keep driving straight ahead while gradually
reducing speed. Then slowly pull off the road to asafe place. Changing a flat tire
WARNING
Do not jack up the vehicle on an incline or a
loose road surface. The jack can come out of
the jacking point or sink into the ground and this can result in a severe accident. Use only the jack provided with your ve-
hicle. The jack supplied with the vehicle is de-signed only for changing a tire. Never get un-der the vehicle while supporting the vehicle with this jack. Always turn the engine off before raising the
flat tire off the ground using the jack. Neverswing or push the vehicle supported with the
jack. The jack can come out of the jackingpoint due to a jolt and this can result in a
severe accident. 1. Park on a hard, level surface, whenever possible,
then stop the engine.
2. Set the parking brake securely and shift a manual
transmission vehicle in reverse or an automatictransmission vehicle in the
“P” (Park) position.
3. Turn on the hazard warning flasher and have ev-
eryone get out of the vehicle.
4. Put wheel blocks at the front and rear of the tire
diagonally opposite the flat tire.

In case of emergency
9-12
11. Before putting the spare tire on, clean themounting surface of the wheel and hub with a cloth.
12. Put on the spare tire. Replace the wheel nuts.
Tighten them by hand.
WARNING
Do not use oil or grease on the wheel studs or nuts when the spare tire is installed. Thiscould cause the nuts to become loose andlead to an accident.
13. Turn the jack handle counterclockwise to lowerthe vehicle.
14. Use the wheel nut wrench to securely tighten

In case of emergency
9-13
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the wheel nuts to the specified torque, following the
tightening order in the illustration.
The torque for tightening the nuts is 58 to 72 ft-lb (80
to 100 N-m, 8 to 10 kg-m). This torque is equivalentto applying about 88 to 110 lbs (40 to 50 kg) at the
top of the wheel nut wrench. Never use your foot on
the wheel nut wrench or a pipe extension on the
wrench because you may exceed the specified
torque. Have the wheel nut torque checked at the
nearest automotive service facility.
15. Store the flat tire in the spare tire compartment.
Put the spacer and tighten the attaching bolt firmly.
Also store the jack and wheel nut wrench in theirstorage locations.
After placing the jack in its storage location, turn the
jackscrew clockwise by hand until it becomes too
hard to turn. Then, tighten it by an additional 1/4 –
1/3 of a turn using a screwdriver or the jack handle.
Unless the jack is properly secured, it may rattlewhile the vehicle is moving.

In case of emergency
9-20
taching the towing hook.
3. Screw the towing hook into the threaded hole un-
til its thread can no longer be seen.
4. Tighten the towing hook securely with a wheel nut
wrench.
After towing, remove the towing hook from the
vehicle and stow it in the tool bag. Put the threaded
hole cover on the front bumper.
WARNING
Do not use the towing hook except when
towing your vehicle. Be sure to remove the towing hook after
towing. Leaving the towing hook mounted onthe vehicle could interfere with proper opera- tion of the SRS airbag system in a frontal col- lision. Rear towing hook:
CAUTION
Do not apply excessive lateral load to the tow- ing hook.

In case of emergency
9-22
tion.
1. Shift the selector lever into the “P” position for au-
tomatic transmission vehicles or “1st” for manual
transmission vehicles.
2. Pull up the parking brake lever firmly.
3. Secure the vehicle onto the carrier properly with safety chains. Each of safety chain should be
equally tightened and care must be taken not to pull
the chains so tightly that the suspension bottomsout.
CAUTION
If your vehicle has a front underspoiler and rear underspoiler (both optional), be carefulnot to scrape them when placing the vehicleon the carrier and when removing the vehicle
from the carrier.
Towing with all wheels on the ground
1. Check the transmission and differential oil levels
and add oil to bring it to the upper level if necessary.
2. Release the parking brake and put the transmis-sion in neutral.
3. The ignition switch should be in the “ACC” posi-
tion while the vehicle is being towed.
4. Take up slack in the towline slowly to prevent
damage to the vehicle.

Maintenance and service
11-7
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WRX:
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 12 in.
(30 cm) from the closed position and let it drop.
After closing the hood, be sure the hood is securelylocked.
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 fly open while the vehicle is moving and block
your view, which may cause an accident and
serious bodily injury.

Maintenance and service
11-11
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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
engine oil level reading may be in a range betweenthe 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 theengine.
3. Remove the oil filler cap.
1) 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.
5. Wipe the seating surface of the drain plug with a
clean cloth and tighten it securely with a new seal-

Maintenance and service
11-17
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1) Rubber gaskets
3. After refilling the reserve tank and the radiator, re- install the caps and check that the rubber gaskets
inside the radiator cap are in the proper position.
CAUTION
Be careful not to spill engine coolant when
adding it. If coolant touches the exhaust pipe, it may cause a bad smell, smoke, and/or a fire. Do not splash the engine coolant over
painted parts. The alcohol contained in the en-gine coolant may damage the paint surface.
Changing the coolant
1) Drain plug
Change the engine coolant using the following pro-
cedures according to the maintenance schedule.
1. Remove the under cover.
2. Place a proper container under the drain plugand loosen the drain plug.
3. Loosen the radiator cap to drain the coolant from
the radiator. Then drain the coolant from the reserve
tank. Tighten the drain plug securely.

Maintenance and service
11-21
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1) Bolt
1. Remove the bolt securing the rear air cleaner ele-
ment case.
2. Unsnap the three clamps holding the rear air
cleaner element case.1) Air cleaner element
3. Separate the rear air cleaner element case from
the front cleaner element case and remove the air
cleaner element.
4. Clean the inside of the front and rear air cleaner
element cases with a damp cloth and install a new air cleaner element.
5. Insert the four projections on the rear air cleaner
element case into the slits on the front air cleaner
element case and snap the three clamps on the rearair cleaner element case and then tighten the bolt.