2004 SUBARU IMPREZA engine

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Instruments and controls
driver to fasten the seatbelt.
The seatbelt warning light remains on for about six
seconds and turns off automatically after six seconds.
The seatbelt reminder chime will turn off when the
driver’s side seatbelt is buckled or it will turn off auto-
matically after six seconds. !
SRS airbag system warning light
When the ignition switch is turned to the “ON” position,
the SRS airbag system warning light will come on for
about six seconds and go out. This shows the SRS air-
bag and SRS side airbag (if equipped) and seatbelt
pretensioners are in normal operation.
If this light comes on while driving or remains illuminat-
ed even after a period of about 6 seconds from when
the ignition has been turned on, it may indicate that the
SRS airbag system or SRS side airbag system (if
equipped) or seatbelt pretensioner system is not work-
ing properly. Contact your nearest SUBARU dealer
immediately. !
CHECK ENGINE warning light/
Malfunction indicator lamp
If the CHECK ENGINE light comes on while you
are driving, have your vehicle checked/repaired
by your SUBARU dealer as soon as possible.
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.
If this light comes on steadily or blinks while the engine
is running, it may indicate that there is a problem or po-
tential problem somewhere in the emission controlsystem. ! 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 sys-
tem malfunction has been detected.
You should have your vehicle checked by an autho-
rized SUBARU dealer immediately.

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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 indica-
tor lamp coming on could be a loose or missing fuel fill-
er 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 EN-
GINE warning light turn off immediately. It may take
several driving trips. If the light does not go out, take
your vehicle to your authorized SUBARU dealer im-
mediately. !If the light is blinking:
If the light is blinking while driving, an engine misfire
condition has been detected which may damage the
emission control system.
To prevent serious damage to the emission control
system, you should do the following: "Reduce vehicle speed.
" Avoid hard acceleration.
" Avoid steep uphill grades.
" Reduce the amount of cargo, if possible.
" Stop towing a trailer as soon as possible.
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 condition but the
light remains on, contact your nearest SUBARU deal-
er immediately. ! 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 lev-
el is low, add oil immediately. If the engine oil is at the
proper level but the light remains on, contact your
nearest SUBARU dealer immediately.

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Instruments and controls
Do not operate the engine with the oil pressure
warning light on. This may cause serious en-
gine damage.
! AT OIL TEMPerature warning
light (for AT vehicles)
If this light comes on when the engine is running, it
may indicate that the automatic transmission fluid tem-
perature is too hot.
If the light comes on while driving, it is unnecessary to
stop the vehicle, but avoid driving up steep grades or
in stop and go traffic. ! Automatic transmission control system warn-
ing
If the light flashes after the engine starts, it may indi-
cate that the automatic transmission control system is
not working properly. Contact your nearest SUBARU
dealer for service immediately. !
Rear differential oil temperature
warning light (WRX-STi)
Reduce vehicle speed and park the vehicle in a
safe place as soon as possible if the R.DIFF
TEMP light comes on. Continued driving with
this light on can damage the rear differential
and other parts of the powertrain.
If this light comes on when the engine is running, it
may indicate that the rear differential oil temperature is
too hot.
At this time, the driver’s control center differential will
automatically cancel the current torque-distribution ra-
tio setting and adopts its minimum ratio.
If the light comes on while driving, reduce vehicle
speed and stop the vehicle at the nearest safe place.
Park the vehicle for several minutes. After the light
goes out, you can start driving.
If the light does not go out, contact the neares
SUBARU dealer for service.
NOTE " If the tire pressures are not correct and/or the

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tires are not all the same size and brand, the rear
differential will be heavily loaded when the vehicle
is driven, resulting in an abnormally high oil tem-
perature. "The rear differential oil will deteriorate if its tem-
perature increases enough for the rear differential
oil temperature warning light to come on. It is ad-
visable to have the rear differential oil replaced as
soon as possible. ! ABS warning light
The ABS warning light comes on when the ignition
switch is turned to the “ON” position and goes out after
about two seconds.
This is an indication that the ABS system is working
properly.
If the warning light behaves as follows, the ABS
system may not work properly.
When the warning light is on, the ABS function
shuts down; however, the conventional brake
system continues to operate normally." The warning light does not come on when the
ignition switch is turned to the “ON” position." The warning light comes on when the ignition switch is turned to the “ON” position, but it
does not go out even when the vehicle speed
exceeds approximately 8 mph (12 km/h)."
The warning light comes on during driving.
If these occur, have the ABS system repaired at
the first available opportunity by your SUBARU
dealer.
With a vehicle equipped with an EBD system, the ABS
warning light comes on together with the brake system
warning light if the EBD system becomes faulty. For
further details of the EBD system fault warning, refer to “Brake system warning light”.
NOTE
If the warning light behavior is as described be-
low, the ABS system may be considered normal." The warning light comes on right after the en-
gine is started but goes out immediately, remain-
ing off." The warning light remains on after the engine
has been started, but it goes out when the vehicle
speed reaches about 8 mph (12 km/h)." The warning light comes on during driving, but
it goes out immediately and remains off.
When driving with an insufficient battery voltage such
(U.S.) (Canada)

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Instruments and controls
as when the engine is jump started, the ABS warning
light may come on. This is due to the low battery volt-
age and does not indicate a malfunction. When the
battery becomes fully charged, the light will go out. !
Brake system warning light
"Driving with the brake system warning light
on is dangerous. This indicates your brake sys-
tem may not be working properly. If the light re-
mains on, have the brakes inspected by a
SUBARU dealer immediately." If at all in doubt about whether the brakes are
operating properly, do not drive the vehicle.
Have your vehicle towed to the nearest
SUBARU dealer for repair.
This light has the following two functions: ! Parking brake warning
The light comes on with the parking brake applied
while the ignition switch is in the “ON” position. It goes
out when the parking brake is fully released. !
Brake fluid level warning
This light comes on when the brake fluid level has
dropped to near the “MIN” level of the brake fluid res-
ervoir with the ignition switch in the “ON” position and
with the parking brake fully released.
If the brake system warning light should come on while
driving (with the parking brake fully released and with
the ignition switch positioned in “ON”), it could be an
indication of leaking of brake fluid or worn brake pads.
If this occurs, immediately stop the vehicle at the near-
est safe place and check the brake fluid level. If the flu-
id level is below the “MIN” mark in the reservoir, do not
drive the vehicle. Have the vehicle towed to the near-
est SUBARU dealer for repair. ! Electronic Brake Force Distribution (EBD) sys-
tem warning (for vehicles with ABS)
The brake system warning light also illuminates if a
malfunction occurs in the EBD system. In that event, it
comes on together with the ABS warning light.
The EBD system may be malfunctioning if the brake
system warning light and ABS warning light illuminate
simultaneously during driving.
Even if the EBD system fails, the conventional braking
system will still function. However, the rear wheels will
be more prone to locking when the brakes are applied
harder than usual and the vehicle’s motion may there-
(U.S.) (Canada)

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fore become somewhat harder to control. If the brake system warning light and ABS warning
light illuminate simultaneously, take the following
steps:
1. Stop the vehicle in the nearest safe, flat place.
2. Shut down the engine, then restart it.
3. Release the parking brake. If both warning lights go
out, the EBD system may be faulty. Drive carefully to
the nearest SUBARU dealer and have the system in-
spected.
4. If both warning lights come on again and stay illu-
minated after the engine has been restarted, shut
down the engine again, apply the parking brake, and
check the brake fluid level.
5. If the brake fluid level is not below the “MIN” mark,
the EBD system may be faulty. Drive carefully to the
nearest SUBARU dealer and have the system inspect-
ed.
6. If the brake fluid level is below the “MIN” mark, DO
NOT drive the vehicle. Instead, have the vehicle towed
to the nearest SUBARU dealer for repair. !Door open warning lights
The door open warning light comes on if any door or
the rear gate is not fully closed.
Always make sure this light is out before you start to drive. !
Front-wheel drive warning light
(for AT vehicles – if equipped)
This light comes on when All Wheel Drive is disen-
gaged and the drive mechanism is switched to Front
Wheel Drive for maintenance or similar purposes. ! Intercooler water spray warning
light (WRX-STi)
This light comes on when the water level in the inter-
cooler water spray tank falls to the lower limit (about
0.4 U.S. qt, 0.4 liter, 0.4 Imp qt.).

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!Driver’s control center differential indi-
cator lights (WRX-STi)
These indicator lights show the current differential-ac-
tion limiting factor (torque-distribution ratio between
the front and rear wheels) of the center differential.
The bottom indicator light “ ” flashes in the event of
failure of the driver’s control center differential. For de-
tails, refer to Chapter 7, “Driver’s Control Center Dif-
ferential (DCCD) (WRX-STi)”. ! Headlight indicator light (WRX-
STi)
This light comes on when the headlight switch is placed in the “ ” or “ ” position. !
REV indicator light (WRX-STi)
This light comes on when the engine speed reaches a
level set by the user and when the tachometer needle
enters the red zone.
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more than just a few seconds.
! Daytime running light system (except
U.S. spec. WRX-STi)
The low beam headlights will automatically come on at
reduced brightness when the engine has started, un-
der the following conditions: " The parking brake is fully released.
" The light switch is in the “OFF” or “ ” position.
" The automatic transmission selector lever is set at
other than the “P” position.
The tail lights, parking lights, and side marker
lights are not turned on by the daytime running
light system. The light switch must always be
turned to the “ ” position when it is dark
outside.
Turn signal lever
1) Right turn
2) Left turn
3) Lane change for right
4) Lane change for left
To activate the right turn signal, push the turn signal le-
ver up. To activate the left turn signal, push the turn
signal lever down. When the turn is finished, the lever
will return automatically. If the lever does not return af-
ter cornering, return the lever to the neutral position by
hand.
To signal a lane change, push the turn signal lever up
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HS3027BB