2011 SUBARU IMPREZA WRX check engine

3-22Instruments and controls
If the brake system warning light should
illuminate 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 illuminates
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 turn off, the EBD system
may be malfunctioning. Drive carefully to
the nearest SUBARU dealer and have the
system inspected.
4. If both warning lights illuminate again
and remain 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
malfunctioning. Drive carefully to the
nearest SUBARU dealer and have the
system inspected.
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.
& Low fuel warning light
The low fuel warning light illuminates
when the tank is nearly empty approxi-
mately 2.6 US gal (10.0 liters, or 2.2 Imp
gal). It only operates when the ignition
switch is in the “ON ”position. When this light illuminates, fill the fuel tank immedi-
ately.
NOTE
This light does not turn off unless the
tank is replenished up to an internal
fuel quantity of approximately 3.7 US
gal (14 liters, 3.1 Imp gal).
CAUTION
Promptly put fuel in the tank when-
ever the low fuel warning light
illuminates. Engine misfires as a
result of an empty tank could cause
damage to the engine.
& Hill start assist warning
light (MT models –if
equipped)/Hill start as-
sist OFF indicator light (STI)
! Hill start assist warning light
While the engine is rotating, if there are
any malfunctions in the Hill start assist
system, the light will illuminate.
WARNING
When the Hill start assist warning

3-24Instruments and controls
!Vehicle Dynamics Control warning
light (yellow)
CAUTION
The Vehicle Dynamics Control sys-
tem provides its ABS control
through the electrical circuit of the
ABS system. Accordingly, if the ABS
is inoperative, the Vehicle Dynamics
Control system becomes unable to
provide ABS control. As a result, the
Vehicle Dynamics Control system
also becomes inoperative, causing
the warning light to illuminate.
Though both the Vehicle Dynamics
Control and ABS systems are inop-
erative in this case, the ordinary
functions of the brake system are
still available. You will be safe while
driving with this condition, but drive
carefully and have your vehicle
checked at a SUBARU dealer as
soon as possible.
NOTE . If the electrical circuit of the Vehicle
Dynamics Control system itself mal-
functions, the warning light only illumi-
nates. At this time, the ABS (Anti-lock
Brake System) remains fully opera-tional. .
The warning light illuminates when
the electronic control system of the
ABS/Vehicle Dynamics Control systemmalfunctions.
The Vehicle Dynamics Control system is
probably inoperative under any of the
following conditions. Have your vehicle
checked at a SUBARU dealer immedi-
ately. . The warning light does not illuminate
when the ignition switch is turned to the “ ON ”position.
. The warning light illuminates while the
vehicle is running.
NOTE
If the warning light behavior is as
described below, the Vehicle Dynamics
Control system may be considerednormal. . The warning light illuminates right
after the engine is started but turns off
immediately, remaining off.. The warning light illuminates after
engine startup and turns off while the
vehicle is subsequently being driven.. The warning light illuminates during
driving, but it turns off immediately and
remains off. !
Vehicle Dynamics Control OFF in-
dicator light (yellow)
. This light illuminates when the Vehicle
Dynamics Control OFF switch is pressed
(except STI). . This light illuminates when the Vehicle
Dynamics Control mode switch is pressed
for more than 2 seconds (STI). . The light illuminates when the Vehicle
Dynamics Control system is deactivated. NOTE . The light may remain illuminated for
a while after the engine has been
started, especially in cold weather. This
does not indicate the existence of a
problem. The light should turn off as
soon as the engine has warmed up.. The indicator light illuminates when
the engine has developed a problem
and the CHECK ENGINE warning light/
malfunction indicator lamp is on.
The Vehicle Dynamics Control system is
probably malfunctioning under the follow-
ing condition. Have your vehicle checked
at a SUBARU dealer as soon as possible. . The light does not turn off even after
the lapse of several minutes (the engine
has warmed up) after the engine hasstarted.

turn it again to the“ON ”position.
. If this indicator light and the CHECK
ENGINE warning light/malfunction in-
dicator lamp flash simultaneously dur-
ing driving, have the vehicle checked
by your nearest SUBARU dealer. & Cruise control set in-
dicator light
This light illuminates when vehicle speed
has been set. &Front fog light indicator
light (if equipped)
This indicator light illuminates while the
front fog lights are illuminated. & Headlight indicator
light (if equipped)
This indicator light illuminates when the
headlight switch is placed in the “”or
“” position. &
Driver ’s control center differ-
ential auto indicator light (STI)
This light functions while the ignition
switch is “ON ”. When illuminated, it
indicates that the driver ’s control center
differential is set to the auto mode. It turns
off when the driver ’s control center differ-
ential is set to the manual mode. For
details, refer to “Driver ’s Control Center
Differential (DCCD) (STI) ”F 7-18.
! Driver ’s control center dif-
ferential auto [+] indicatorlight
When the AUTO [+] mode is set, the
AUTO [+] indicator light illuminates.
For details, refer to “Driver ’sControl
Center Differential (DCCD) (STI) ”F 7-18. !
Driver ’s control center dif-
ferential auto [ ] indicator
light
When the AUTO [ ] mode is set, the
AUTO [ ] indicator light illuminates.
For details, refer to “Driver ’s Control
Center Differential (DCCD) (STI) ”F 7-18.
& Driver ’s control center differ-
ential indicator and warning
lights (STI)
! Indicator lights
When you select the manual mode of the driver ’s control center differential, the
initial limited slip differential (LSD) torque
that is currently selected for the center
differential is indicated by the illumination
of these indicator lights. Instruments and controls
3-27
– CONTINUED –

Ventilator.............................................................. 4-2
Airflow 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 ..................................... 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
Airflow control dial .............................................. 4-9
Air inlet selection button .................................... 4-10 Air conditioner button
........................................ 4-11
Temperature sensors ......................................... 4-11
Operating tips for heater and air conditioner ...................................................... 4-12
Cleaning ventilation grille ................................... 4-12
Efficient cooling after parking in direct sunlight ........................................................... 4-12
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 .............................................. 4-13
Refrigerant for your climate control system ... ..... 4-13
Air filtration system ........................................... 4-13
Replacing an air filter ......................................... 4-13Climate control
4

4-12Climate control
properly and become damaged, the sys-
tem may not be able to control the interior
temperature correctly. To avoid damaging
the sensors, observe the following pre-cautions. –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 the windshield
defroster grille.– Interior air temperature sensor: near
the ignition switch.– Outside temperature sensor: behind
the 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 obstructions
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
allow 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 conditioner 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
operation each spring. Have the air con-
ditioning system checked 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
any problem with the air conditioning

system. &Air conditioner compressor
shut-off when engine is
heavily loaded
To improve acceleration and gas mileage,
the air conditioner compressor is designed
to temporarily shut off during air condi-
tioner operation whenever the accelerator
is fully depressed such as during rapid
acceleration or when driving on a steepupgrade. & Refrigerant for your climate
control system
Your air conditioner uses ozone friendly
refrigerant HFC134a. Therefore, the meth-
od 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 refrigerant are
not covered under warranty. Air filtration system
Replace the filter element according to the
replacement schedule as follows. This
schedule should be followed to maintain
the filter
’s dust collection ability. Under
extremely dusty conditions, the filter
should be replaced more frequently. It is
recommended that you have your filter
checked or replaced by your SUBARU
dealer. For replacement, use only a
genuine SUBARU air filter kit.
Replacement schedule: Every 12 months or 7,500 miles (12,000
km) whichever comes first
CAUTION
Contact your SUBARU dealer if the
following occurs, even if it is not yet
time to change the filter: . Reduction of the airflow through
the vents.
. Windshield gets easily fogged or
misted.
NOTE
The filter can influence the air condi-
tioning, heating and defroster perfor- mance if not properly maintained. &
Replacing an air filter
1. Remove the glove box. (1) Open the glove box.(2) Remove the damper shaft from the
glove box. Climate control
4-13
– CONTINUED –

Fuel...................................................................... 7-3
Fuel requirements ............................................... 7-3
Fuel filler lid and cap ........................................... 7-4
State emission testing (U.S. only) ...................... 7-7
Preparing to drive ............................................... 7-8
Starting the engine .............................................. 7-9
MT models .......................................................... 7-9
AT models ........................................................... 7-9
Stopping the engine ........................................... 7-10
Remote engine start system (dealer option) .............................................................. 7-11
Starting your vehicle .......................................... 7-11
Remote start safety features ............................... 7-11
Entering the vehicle while it is running via remote start ................................................................. 7-12
Entering the vehicle following remote engine start shutdown ......................................................... 7-12
Pre-heating or pre-cooling the interior of the vehicle ............................................................. 7-12
Service mode ..................................................... 7-12
Remote engine start transmitter programming and programmable feature option ..................... 7-12
System maintenance .......................................... 7-13
Manual transmission –6 speeds (STI) ............. 7-15
Selecting reverse gear ........................................ 7-15
Shifting speeds .................................................. 7-16
Driving tips ........................................................ 7-16
Manual transmission –5 speeds (except
STI) ................................................................... 7-17
Shifting speeds .................................................. 7-17
Driving tips ........................................................ 7-18 Driver
’s Control Center Differential (DCCD)
(STI) ................................................................. 7-18
To change mode of driver ’s control center
differential ....................................................... 7-19
Auto mode ........................................................ 7-19
Manual mode ..................................................... 7-20
Temporary release ............................................. 7-22
Automatic transmission .................................... 7-22
Select lever ....................................................... 7-23
Shift lock function ............................................. 7-24
Selection of manual mode .................................. 7-26
Driving tips ........................................................ 7-27
SPORT mode ..................................................... 7-28
SI-DRIVE (STI) .................................................... 7-28
Intelligent (I) mode ............................................. 7-28
Sport (S) mode .................................................. 7-29
Sport Sharp (S#) mode. ...................................... 7-29
SI-DRIVE selector .............................................. 7-30
Limited slip differential (LSD) (STI) .................. 7-30
Power steering ................................................... 7-31
Braking ............................................................... 7-31
Braking tips ....................................................... 7-31
Brake system .................................................... 7-31
Disc brake pad wear warning indicators ............. 7-32
ABS (Anti-lock Brake System) .......................... 7-32
ABS system self-check ...................................... 7-33
ABS warning light .............................................. 7-33
Electronic Brake Force Distribution (EBD) system ............................................................. 7-33
Steps to take if EBD system malfunctions ..... ..... 7-33
Starting and operating
7

7-4Starting and operating
!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
determined that the condition is caused
by the type of fuel used, repairs may not
be covered by your warranty. ! Gasoline for cleaner air
Your use of gasoline with detergent
additives will help prevent deposits from
forming 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
materials called oxygenates. Use of these
fuels can also help keep the air cleaner.
Oxygenated blend fuels, such as MTBE
(Methyl Tertiary Butyl ether) or ethanol
(ethyl or grain alcohol) may be used in your vehicle, 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
operators if their gasolines contain deter-
gents and oxygenates and if they have
been reformulated to reduce vehicle emis-sions.
As additional guidance, only use fuels
suited for your vehicle as explained in the
following description. .
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 ANDif it is accompanied by
sufficient quantities of the proper cosol-
vents and corrosion inhibitors required to
prevent damage to the fuel system. Do not
use fuel containing methanol EXCEPT
under 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
improper fuel are not covered under the
SUBARU Limited Warranty.
CAUTION
Do not let fuel spill on the exterior
surfaces of the vehicle. Because
fuel may damage the paint, be sure
to wipe off any spilled fuel quickly.
Paint damage caused by spilled fuel
is not covered under the SUBARU
Limited Warranty.
& Fuel filler lid and cap
! Refueling
Only one person should be involved in
refueling. Do not allow others to approach
the area of the vehicle near the fuel filler
pipe while refueling is in progress.
Be sure to observe any other precautions
that are posted at the service station.