2007 SUBARU IMPREZA engine

contact your nearest SUBARU dealer
immediately.
CAUTION
Do not operate the engine with the
oil pressure warning light on. This
may cause serious engine damage.
& AT OIL TEMPerature
warning light (AT vehi- cles)
The AT oil temperature warning light
comes on when the ignition switch is
turned to the “ON ”position and goes out
after the engine has started.
If this light comes on when the engine is
running, it may indicate that the automatic
transmission fluid temperature 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 warning
If the light flashes after the engine starts, it
may indicate that the automatic transmis-
sion control system is not working prop-
erly. Contact your nearest SUBARU deal- er for service immediately.
& Rear differential oil
temperature warning
light (WRX-STI)
CAUTION
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 thepowertrain.
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 ratio 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
nearest SUBARU dealer for service. NOTE .
If the tire pressures are not correct
and/or the 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 temperature.. The rear differential oil will deterio-
rate if its temperature increases en-
ough for the rear differential oil tem-
perature warning light to come on. It is
advisable 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 approximately
2 seconds.
This is an indication that the ABS system
is working properly.
CAUTION
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 con-
tinues to operate normally. Instruments and controls
3-17
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3-18Instruments and controls
.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 tothe “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 dur-
ing driving.
If any of these conditions 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 in the following, the ABS
system may be considered normal. . The warning light comes on right
after the engine is started but goes out
immediately, remaining off.. The warning light remains on after the engine has been started, but it goes
out when the vehicle speed reaches
approximately 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 as when the engine is jump
started, the ABS warning light may come
on. This is due to the low battery voltage
and does not indicate a malfunction.
When the battery becomes fully charged,
the light will go out. & Brake system warning light
WARNING
. Driving with the brake system
warning light on is dangerous.
This indicates your brake system
may not be working properly. If
the light remains on, we recom-
mend that you have the brakes
inspected by a SUBARU dealer
immediately.
. If at all in doubt about whether
the brakes are operating prop-
erly, do not drive the vehicle.
Have your vehicle towed to the
nearest SUBARU dealer for re- pair.
This light has the following three 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 reservoir 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 nearest safe place
and check the brake fluid level. If the fluid
level is below the “MIN ”mark in the
reservoir, do not drive the vehicle. Have
the vehicle towed to the nearest SUBARU
dealer for repair. ! Electronic Brake Force Distribution
(EBD) system warning
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 conven-
tional 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 vehi-cle’s motion may therefore become some-
what 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, apply the
parking brake and 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 inspected.
4. If both warning lights come on again
and stay illuminated 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 systeminspected.
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 light
The door open warning light comes on if
any door or the rear gate is not fullyclosed.
Always make sure this light is out before
you start to drive. &All-Wheel Drive warn-
ing light (AWD AT vehicles –if equipped)
The All-Wheel Drive warning light comes
on when the ignition switch is turned to the“ON ”position and goes out after the
engine has started.
This light comes on when All-Wheel Drive
is disengaged and the drive mechanism is
switched to Front Wheel Drive for main-
tenance or similar purposes (Non-turbo vehicles). It flashes if the vehicle is driven with tires
of differing diameters fitted on the wheels
or with an excessively low air pressure in
any of the tires.
CAUTION
Continuing to drive with the AWD
warning light flashing can damage
the powertrain. If the AWD warning
light starts to flash, promptly park in
a safe place and check whether the
tires have differing diameters and
whether any of the tires has an
excessively low inflation pressure.
& Intercooler water spray
warning light (WRX-STI)
This light comes on when the water level
in the intercooler water spray tank falls to
the lower limit (approximately 0.4 US qt,
0.4 liter, 0.4 Imp qt). Instruments and controls
3-19
– CONTINUED –

&Driver ’s control center differ-
ential indicator and warning
lights (WRX-STI)
! Indicator lights
When illuminated, one of these indicator
lights indicates the initial limited slip
differential (LSD) torque currently selected
for the center differential. !
Warning light
The bottom indicator light “”flashes in the
event of failure of the driver ’s control
center differential. Have the vehicle in-
spected by your SUBARU dealer. For
details, refer to Chapter 7, “Driver ’s Con-
trol Center Differential (DCCD) (WRX-STI) ”.
& Lights 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 driver and
when the tachometer needle enters the
red zone. Instruments and controls
3-21

&High/low beam change (dim- mer)
To change from low beam to high beam,
push the turn signal lever forward. When
the headlights are on high beam, the high
beam indicator light “
”on the instru-
ment panel is also on.
To switch back to low beam, pull the lever
back to the detent position. &
Headlight flasher
To flash the headlights, pull the lever
toward you and then release it. The high
beam will stay on for as long as you hold
the lever. The headlight flasher works
even though the light switch is in the“OFF ”position.
When the headlights are on high beam,
the high beam indicator light “
”on the
instrument panel also comes on.
CAUTION
Do not hold the lever in the flashing
position for more than just a fewseconds. &
Daytime running light system
! WRX-STI
The low beam headlights, side marker
lights, tail lights, parking lights, and license
plate lights will automatically come on
when the engine has started, under 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.
WARNING
The light switch must always be
turned to the “
”position when it
is dark outside.
! Except WRX-STI
The low beam headlights will automati-
cally come on at reduced brightness when
the engine has started, under the followingconditions: . 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.
Instruments and controls
3-23
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Ventilator.............................................................. 4-2
Air flow selection ................................................ 4-2
Center and side ventilators .................................. 4-3
Manual climate control system (if equipped) ..................................................... 4-3
Control panel ...................................................... 4-3
Heater operation ................................................. 4-5
Air conditioner operation (if equipped) ...................................................... 4-7
Automatic climate control system (if equipped) ..................................................... 4-8
Control panel ...................................................... 4-8
To use as full-automatic climate control system .............................................................. 4-8
To use as semi-automatic climate control system .............................................................. 4-8
Fan speed control dial ......................................... 4-9
Temperature control dial ...................................... 4-9
Air flow control dial ............................................. 4-9 Air inlet selection button
.................................... 4-10
Air conditioner button ........................................ 4-10
Temperature sensors ......................................... 4-11
Operating tips for heater and air conditioner ...................................................... 4-11
Cleaning ventilation grille ................................... 4-11
Efficient cooling after parking in direct sunlight ........................................................... 4-11
Lubrication oil circulation in the refrigerant circuit .............................................................. 4-12
Checking air conditioning system before summer season ............................................................ 4-12
Cooling and dehumidifying in high humidity and low temperature weather conditions ................. 4-12
Air conditioner compressor shut-off when engine is heavily loaded .............................................. 4-12
Refrigerant for your climate control system ... ..... 4-12
Air filtration system ........................................... 4-12
Replacing the air filter ........................................ 4-13Climate control
4

4-4Climate control
!Fan speed control dial
The fan operates only when the ignition
switch is turned to the “ON ”position. The
fan speed control dial is used to select 4
fan speeds. ! Air flow control dial
This dial has the following five positions:
: Air flows through the instrument panel
outlets.
: Air flows through the instrument panel
outlets and the foot outlets.
: Air flows through the foot outlets and
some through the windshield defroster outlets.
: Air flows through the windshield
defroster outlets and foot outlets.
: Air flows through the windshield
defroster outlets. NOTE . You will find the notation “USE WITH
” on the air flow control dial plate.
This is intended to remind you to set
the air inlet selection lever in the “
”
position when defogging the wind- shield.
Defogging with the air inlet selection
lever set in the “
”position provides better defogging performance than in the
“
”position.
. When the dial is placed in the “”
or “”position, the air conditioner
compressor operates automatically re-
gardless of the position of the air
conditioner button to defog the wind-
shield quickly.
However the indicator on the air con-
ditioner button will not come on.
Also, you cannot stop the air condi-
tioner compressor by pressing the air
conditioner button. ! Air conditioner button (if equipped)
The air conditioner operates only when
the engine is running.
Push the air conditioner button while the fan is in operation to turn on the air
conditioner. The indicator light will comeon.
Push it again to turn off the air conditioner. !
Air inlet selection lever
(Recirculation): Interior air is recircu-
lated inside the vehicle.
Place the air inlet selection lever in the “
” position for fast cooling with the air
conditioner or when driving on a dusty road.
(Outside air): Outside air is drawn into
the passenger compartment.
Place the air inlet selection lever in the “
” position when the interior has cooled
to a comfortable temperature and the road
is no longer dusty.
WARNING
Continued operation in the “
”
position may fog up the windows.
Switch to the “
”position as soon
as the outside dusty condition clears.

4-8Climate control
Automatic climate control
system (if equipped)
Although this climate control system can
be used as a full-automatic climate control
system, it can also, if desired, be used as
a semi-automatic climate control system.
When it is used as a full-automatic climate
control system, the outlet air temperature,
fan speed, air flow distribution, air inlet
control, and air conditioner compressor
operation are all automatically controlled
to maintain a constant, comfortable tem-
perature inside the vehicle. NOTE .Operate the automatic climate con-
trol system when the engine is running. . When the engine coolant is cold, the
blower does not run.. In the “AUTO ”mode, when the air
temperature in the passenger compart-
ment is sufficiently cool, the air condi-
tioner compressor does not operate.
For efficient defogging or dehumidify-
ing in cold weather, press the “A/C ”
button to operate the air conditioner
compressor.. Even when cooling is not necessary,
setting the temperature much lower
than the current outlet air temperature
turns on the air conditioner compres- sor automatically and the
“A/C ”indi-
cator light on the control panel comeson. & Control panel
1) Air flow control dial
2) Fan speed control dial
3) Temperature control dial
4) Air conditioner button
5) Air inlet selection button
6) Rear window defogger button (Refer to
the“Rear window defogger button ”sec-
tion in chapter 3.)
& To use as full-automatic cli-
mate control system
Place the temperature control dial in the
position for your desired temperature, then
set the other dials and buttons as de- scribed in the following. The system
’s
functions will then switch to AUTO mode
and be controlled automatically. . Air flow control dial: AUTO position
. Fan speed control dial: AUTO position
. Air inlet selection button: Press for at
least 1 second. (Indicator will flash twice.). Air conditioner button: Press for at least
1 second. (Indicator will flash twice.)
& To use as semi-automatic
climate control system
Each function can be individually set to
AUTO mode independently of the others.
Any function set to AUTO mode is con-
trolled automatically. Any function not set
to AUTO mode can be manually adjusted
as desired.
The temperature can be set within a range
of 65 to 85 8F (20 to 30 8C).