2006 SUBARU IMPREZA engine

Climate control 4-9
– CONTINUED –
AUTO position and the air flow control
dial in the
“ ”, “ ” , or “ ” po-
sition, the fan does not operate during
engine warmup until the engine cool-
ant temperature exceeds approx. 122 F
(50 C).
Temperature control dial
This dial is used to set the desired interior
temperature. With the dial set to your de-
sired temperature, the system automati-
cally adjusts the temperature of air sup-
plied from the outlets such that the desired
temperature is achieved and maintained.
If the dial is turned fully counterclockwise,
the system gives maximum cooling perfor-
mance. If the dial is turned fully clockwise,
the system gives maximum heating per- formance.
Air flow control dial
This dial has the following six positions.
The outlets from which air is supplied in
each position are as follows:
AUTO:
The air flow control is adjusted au-
tomatically in accordance with the air tem-
perature inside and outside the passenger
compartment, the intensity of sunlight,
and other factors. SUBARU recommends
using the AUTO position.
: Instrument panel outlets: Instrument panel outlets and foot out-
lets
: Foot outlets and windshield defroster
outlets (relatively little air from windshield defroster outlets)
: Windshield defroster outlets and foot
outlets
: Windshield defroster outlets
NOTE
When the dial is placed in the “ ”
or “ ” position, the air conditioner
compressor operates automatically to
defog the windshield quickly. At the
same time, the air inlet selection is au-
tomatically set to “outside air ” mode.
Air inlet selection button
ON position (Recirculation): Interior air
is recirculated inside the vehicle. Push the
air inlet selection button to the ON position
for fast cooling with the air conditioner or
400600
400380
400381

Climate control 4-11
– CONTINUED –
–
Do not subject the sensors to impact.
– Keep water away from the sensors.
– Do not cover the sensors.
The sensors are located as follows: – Solar sensor: beside windshield de-
froster grille – Interior air temperature sensor: beside
the fan speed control dial– Outside temperature sensor: behind
front grille.
Operating tips for heater and
air conditioner
Cleaning ventilation grille
Always keep the front ventilation inlet
grille free of snow, leaves, or other ob-
structions to ensure efficient heating and
defrosting. Since the condenser is located
in front of the radiator, this area should be
kept clean because cooling performance
is impaired by any accumulation of insects
and leaves on the condenser.
Efficient cooling after parking
in direct sunlight
After parking in direct sunlight, drive with
the windows open for a few minutes to al- low outside air to circulate into the heated
interior. This results in quicker cooling by
the air conditioner. Keep the windows
closed during the operation of the air con-
ditioner for maximum cooling efficiency.
Lubrication oil circulation in
the refrigerant circuit
Operate the air conditioner compressor at
a low engine speed (at idle or low driving
speeds) a few minutes each month during
the off-season to circulate its oil.
Checking air conditioning
system before summer sea-
son
Check the air conditioner unit for refriger-
ant leaks, hose conditions, and proper op-
eration each spring. This check is best
performed by your SUBARU dealer.
Cooling and dehumidifying in
high humidity and low tem-
perature weather conditions
Under certain weather conditions (high
relative humidity, low temperatures, etc.)
a small amount of water vapor emission
from the air outlets may be noticed. This
condition is normal and does not indicate
400603

4-12 Climate control
any problem with the air conditioning sys-
tem.
Air conditioner compressor
shut-off when engine is
heavily loaded
To improve acceleration and gas mileage,
the air conditioner compressor is de-
signed to temporarily shut off during air
conditioner operation whenever the accel-
erator is fully depressed such as during
rapid acceleration or when driving on a
steep upgrade.
Refrigerant for your climate
control system
Your air conditioner uses ozone friendly
refrigerant HFC134a. Therefore, the
method of adding, changing 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 re-
frigerant are not covered under warranty.
Air filtration system
If your vehicle ’s air conditioning system is
equipped with an air filtration system, re-
place the filter element according to the
replacement schedule shown in the fol-
lowing. This schedule should be followed
to maintain the filter ’s dust collection abili-
ty. Under extremely dusty conditions, the
filter should be replaced more frequently.
It is recommended that you have your fil-
ter checked or replaced by your SUBARU
dealer. For replacement, use only a genu-
ine SUBARU air filter kit.
Replacement schedule:
Every 12 months or 7,500 miles (12,000
km) whichever comes first
Replacing an air filter
1. Remove the glove box.1) Open the glove box.
2) Remove the nine screws and the one
clip securing the glove box.
3) Disconnect the glove box light con-
nector.
400604

6-6 Interior equipment
Cigarette lighter socket
A cigarette lighter socket can be found be-
hind the ashtray lid under the climate con-
trols. Push gently on the lid to open it. A
cigarette lighter plug is an optional acces-
sory. 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.
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. Al-
ways put the cap on the accesso-
ry power outlet when it is not in
use.
Use only electrical appliances
which are designed for 12V DC
and which consume less than
120W. Overloading the accessory
power outlet can cause a short
circuit. Do not use double adapt-
ers or more than one electrical ap-
pliance.
If the plug on your electric appli-
ance is either too loose or too
tight for the accessory power out-
let, this can result in a poor con-
tact or cause the plug to get stuck.
Only use plugs that fit properly.
Use of an electric appliance in the
accessory power outlet for a long
period of time while the engine is
not running can cause battery dis-
charge.
Before driving your vehicle, make
sure that the plug and the cord on
your electrical appliance will not
interfere with your shifting gears
and operating the accelerator and
brake pedals. If they do, do not
use the electrical appliance while
driving.
600221

6-8 Interior equipment
If the socket has been used for electrical
appliances, damage may have been done
to the internal mechanism that causes a
cigarette lighter to “pop out ” after its ele-
ment 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 protect your purchaser
before you sell your vehicle, have your
SUBARU dealer replace the socket with a
new one.
Ashtray
To open the ashtray, push lightly on the lid
below the climate controls.
Fully close the lid after using it to help re-
duce residual smoke.
To remove the ashtray for cleaning, hold
the right and left sides of the ashtray and
pull it out.
NOTE
Particles of ash and tobacco will accu-
mulate around the hinges of the ash-
tray ’s inner lid. Clean them off using a
toothbrush or other narrow-ended im-
plement.
If the plug on your electric appli-
ance is either 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 not running
can cause battery discharge.
Before driving your vehicle, make
sure that the plug and the cord on
your electrical appliance will not
interfere with your shifting gears
and operating the accelerator and
brake pedals. If they do, do not
use the electrical appliance while
driving.
600222
Do not use ashtrays as waste recep-
tacles or leave a lighted cigarette in
an ashtray. This could cause a fire.
600097

7
Starting and operating
Fuel ...................................................................... 7-2
Fuel requirements ................................. ................. 7-2
Fuel filler lid and cap ........................... ................... 7-4
State emission testing (U.S. only) ................ .... 7-5
Preparing to drive ................................ .............. 7-6
Starting the engine ............................... .............. 7-7
Manual transmission vehicle ....................... .......... 7-7
Automatic transmission vehicle .................... ........ 7-7
Stopping the engine ............................... ............ 7-8
Manual transmission – 6 speeds (WRX-STI) ... 7-9
Selecting reverse gear ............................ ............... 7-9
Shifting speeds ................................... .................... 7-9
Driving tips ...................................... ........................ 7-10
Manual transmission – 5 speeds (except
WRX-STI) .......................................... ................ 7-11
Shifting speeds ................................... .................... 7-11
Driving tips ...................................... ........................ 7-12
Driver ’s Control Center Differential (DCCD)
(WRX-STI) ......................................... ............... 7-12
Auto mode ......................................... ...................... 7-13
Manual mode ....................................... .................... 7-13
Temporary release ................................. ................. 7-15
Automatic transmission ............................ ........ 7-16
Selector lever for automatic transmission ......... .. 7-16
Shift lock release ................................ .................... 7-19
Limited slip differential (LSD) (if equipped) ..... 7-20
Power steering .................................... ............... 7-21Braking ...........................................
..................... 7-21
Braking tips ...................................... ....................... 7-21
Brake system ...................................... .................... 7-21
Disc brake pad wear warning indicators ............ .. 7-22
ABS (Anti-lock Brake System) ...................... .... 7-22
ABS system self-check ............................. ............. 7-22
ABS warning light ................................. .................. 7-23
Electronic Brake Force Distribution (EBD) system ............................................ .................. 7-24
Steps to take if EBD system fails ................. ......... 7-24
Parking your vehicle .............................. ............ 7-25
Parking brake ..................................... ..................... 7-25
Parking tips ...................................... ....................... 7-25
Cruise control .................................... ................. 7-27
To set cruise control ............................. ................. 7-27
To temporarily cancel the cruise control .......... ... 7-28
To turn off the cruise control .................... ............. 7-28
To change the cruising speed ...................... ......... 7-28

7-2 Starting and operating
Starting and operatingFuel
Fuel requirements
2.5-liter non-turbo models
The 2.5-liter non-turbo engine is designed
to operate using unleaded gasoline with
an octane rating of 87 AKI or higher.
WRX
The 2.5-liter turbo engine is designed to
operate using premium unleaded gasoline
with an octane rating of 91 AKI or higher.
If premium unleaded gasoline is not avail-
able, regular unleaded gasoline with an
octane rating of 87 AKI or higher may be
temporarily used. For optimum engine
performance and driveability, it is required
that you use premium grade unleaded
gasoline.
NOTE
Be sure to use premium unleaded gas-
oline of 91 AKI or higher for WRX. If
other gasoline (lower than 91 AKI) is
used, knocking, reduced output and poor accelerator response will result.
WRX-STI
The 2.5-liter turbo engine is designed to
operate using super-premium unleaded
gasoline with an octane rating of 93 AKI or
higher. If super-premium unleaded gaso-
line with an octane rating of 93 AKI or
higher is not available, premium unleaded
gasoline with an octane rating of 91 AKI or
higher may be temporarily used. For opti-
mum engine performance and driveability,
it is required that you use super-premium
grade unleaded gasoline with an octane
rating of 93 AKI or higher.
NOTE
Be sure to use super-premium unlead-
ed gasoline of 93 AKI or higher for
WRX-STI. If other gasoline (lower than
93 AKI) is used, knocking, reduced out-
put and poor accelerator response will
result.
Fuel octane rating
This octane rating is the average of the
Research Octane and Motor Octane num-
bers and is commonly referred to as the
Anti Knock Index (AKI).
Using a gasoline with a lower octane rat-
ing can cause persistent and heavy
knocking, which can damage the engine.
Do not be concerned if your vehicle some- times 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 the specified octane
rating and your vehicle knocks heavily or
persistently.
Unleaded gasoline
The neck of the fuel filler pipe is designed
to accept only an unleaded gasoline filler
nozzle. Under no circumstances should
leaded gasoline be used because 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 emission 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 Califor-
nia gasoline specifications. If you live in
any other state than California, your vehi-
cle will operate on gasoline meeting Fed-
eral specifications. Gasoline sold outside
California is permitted to have higher sul-
fur levels, which may affect the perfor-
mance of your vehicle ’s catalytic convert-
er and may produce a sulfur exhaust odor
or smell. SUBARU recommends that you
try a different brand of unleaded gasoline
having lower sulfur to determine if the
Use of a fuel which is low in quality
or use of an inappropriate fuel addi-
tive may cause engine damage.

Starting and operating 7-3
– CONTINUED –
problem is fuel related before returning
your vehicle to an authorized dealer for
service.
MMT
Some gasoline contains an octane-en-
hancing additive called MMT (Methylcy-
clopentadienyl Manganese Tricarbonyl). If
you use such fuels, your emission control
system performance may deteriorate and
the CHECK ENGINE warning light/Mal-
function indicator lamp may turn on. If this
happens, return to your authorized
SUBARU Dealer for service. If it is deter-
mined that the condition is caused by the
type of fuel used, repairs may not be cov-
ered by your warranty.
Gasoline for cleaner air
Your use of gasoline with detergent addi-
tives will help prevent deposits from form-
ing 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, you should never need to add
any fuel system cleaning agents to your
fuel tank.
Many gasolines are now blended with ma-
terials called oxygenates. Use of these fu- els can also help keep the air cleaner. Ox-
ygenated blend fuels, such as MTBE (Me-
thyl Tertiary Butyl ether) or ethanol (ethyl
or grain alcohol) may be used in your ve-
hicle, 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 producing 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 oper-
ators if their gasolines contain detergents
and oxygenates and if they have been re-
formulated to reduce vehicle emissions.
As additional guidance, only use fuels
suited for your vehicle as explained in the
following.
Fuel should be unleaded and have an
octane rating no lower than that specified
in this manual.
Methanol (methyl or wood alcohol) is
sometimes mixed with unleaded gasoline.
Methanol can be used 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 corrosion inhibitors required to pre- vent damage to the fuel system. Do not
use fuel containing methanol
EXCEPT un-
der these conditions.
If undesirable driveability problems are
experienced and you suspect they may be
fuel related, try a different brand of gaso-
line before seeking service at your
SUBARU dealer.
Fuel system damage or driveability
problems which result from the use of im-
proper fuel are not covered under the
SUBARU Limited Warranty.
Do not let fuel spill on the exterior
surfaces of the vehicle. Fuels con-
taining alcohol may cause paint
damage, which is not covered under
the SUBARU Limited Warranty.