2018 SUBARU WRX check engine

(478,1)
北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
Engine overheating
WARNING
Never attempt to remove the radiator
cap until the engine has been shut
off and has fully cooled down. When
the engine is hot, the coolant is
under pressure. Removing the cap
while the engine is still hot could
release a spray of boiling hot cool-
ant, which could burn you very
seriously.
If the engine overheats, safely pull off the
road and stop the vehicle in a safe
location.&If steam is coming from the
engine compartment.Turn off the engine and get everyone
away from the vehicle until it cools down.
.Contact an authorized SUBARU deal-
er.
&If no steam is coming from the
engine compartment1. Keep the engine running at idling
speed.
2. Open the engine hood to ventilate the
engine compartment. Refer to“Engine
hood”F11-9.
Confirm that the cooling fan is turning. If
the fan is not turning, immediately turn off
the engine and contact an authorized
SUBARU dealer for repair.
3. After the engine coolant temperature
has dropped, turn off the engine.Temperature gauge
1) Normal operating rangeIf temperature gauge stays in the over-
heated zone, turn off the engine. Refer to
“Temperature gauge”F3-11.4. After the engine has fully cooled down,
check the coolant level in the reserve tank.
If the coolant level is below the“LOW”
mark, add coolant up to the“FULL”mark.
NOTEFor details about how to check the
coolant level or how to add coolant,
refer to“Engine coolant”F11-17.
5. If there is no coolant in the reserve
tank, add coolant to the reserve tank. Then
remove the radiator cap and fill the radiator
with coolant.
If you remove the radiator cap from a hot
radiator, first wrap a thick cloth around the
radiator cap, then turn the cap counter-
clockwise slowly without pressing down
until it stops. Release the pressure from
the radiator. After the pressure has been
fully released, remove the cap by pressing
down and turning it.
In case of emergency/Engine overheating
9-20

(486,1)
北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
Moonroof (if equipped)–if the
moonroof does not closeIf the moonroof does not close, we
recommend that you have the system
checked by a SUBARU dealer.
If your vehicle is involved in
an accident
CAUTION
If your vehicle is involved in an
accident, be sure to inspect the
ground under the vehicle before
restarting the engine. If you find that
fuel has leaked on the ground, do
not try to restart the engine. The fuel
system has been damaged and is in
need of repair. Immediately contact
the nearest automotive service facil-
ity. We recommend that you consult
your SUBARU dealer.
Your vehicle has a fuel pump shut off
system. To minimize the risk of fire due to
fuel leakage when your vehicle is subject
to impact from an accident or another
factor, the system stops supplying fuel.
However, depending on the impact condi-
tions at the time of collision, the fuel pump
shut-off system may not operate.
Perform the following procedures to restart
the engine after the system is activated.Models without“keyless access with
push-button start system”:
1. Turn the ignition switch to the“LOCK”
or“ACC”position.
2. Restart the engine.
Models with“keyless access with
push-button start system”:
1. Turn the push-button ignition switch to
the“ACC”or“OFF”position.
2. Restart the engine.
In case of emergency/Moonroof–if the moonroof does not close
9-28

(499,1)
北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
Maintenance schedule.......................................... 11-3
Maintenance precautions..................................... 11-3
Before checking or servicing in the engine
compartment...................................................... 11-4
When checking or servicing in the engine
compartment...................................................... 11-5
When checking or servicing in the engine
compartment while the engine is running............ 11-5
Maintenance tips................................................... 11-6
Removing and reinstalling clips............................ 11-6
Engine hood.......................................................... 11-9
Engine compartment overview.......................... 11-11
STI...................................................................... 11-11
Except STI.......................................................... 11-12
Engine oil............................................................. 11-13
Engine oil consumption...................................... 11-13
Checking the oil level.......................................... 11-13
Changing the oil and oil filter.............................. 11-15
Recommended grade and viscosity..................... 11-15
Synthetic oil........................................................ 11-16
Cooling system................................................... 11-16
Cooling fan, hose and connections..................... 11-17
Engine coolant.................................................... 11-17
Air cleaner element............................................. 11-18
Replacing the air cleaner element........................ 11-19
Spark plugs......................................................... 11-21
Recommended spark plugs................................. 11-21
Drive belts........................................................... 11-21Manual transmission oil......................................11-22
Recommended grade and viscosity..................... 11-22
Continuously variable transmission fluid..........11-22
Front differential gear oil (CVT models) and
rear differential gear oil....................................11-23
Recommended grade and viscosity..................... 11-23
Power steering fluid (STI)...................................11-23
Checking the fluid level...................................... 11-23
Recommended fluid............................................ 11-24
Brake fluid............................................................11-24
Checking the fluid level...................................... 11-24
Recommended brake fluid.................................. 11-25
Clutch fluid (MT models).....................................11-25
Checking the fluid level...................................... 11-25
Recommended clutch fluid................................. 11-26
Brake booster......................................................11-26
Brake pedal..........................................................11-27
Checking the brake pedal free play..................... 11-27
Checking the brake pedal reserve distance ......... 11-27
Clutch pedal (MT models)...................................11-27
Checking the clutch function .............................. 11-27
Checking the clutch pedal free play.................... 11-28
Hill start assist system.......................................11-28
Replacement of brake pad andlining................11-28
Breaking-in of new brake pads (models with
electronic parking brake system)..................... 11-29
Breaking-in of new brake pads and linings
(models without electronic parking brake
system)........................................................... 11-29
Maintenance and service
11

(502,1)
北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
in your eyes. If something does
get in your eyes, thoroughly
wash them out with clean water.
.Do not tamper with the wiring of
the SRS airbag system or seat-
belt pretensioner system, or at-
tempt to take its connectors
apart, as that may activate the
system or it can render it inop-
erative. NEVER use a circuit tes-
ter for this wiring. If your SRS
airbag or seatbelt pretensioner
needs service, consult your near-
est SUBARU dealer.
NOTESUBARU does not endorse the use of
non-SUBARU approved flushing sys-
tems and strongly advises against
performing these services on a
SUBARU vehicle. Non-SUBARU ap-
proved flushing systems use chemi-
cals and/or solvents which have not
been tested or approved by SUBARU.
SUBARU warranties do not cover any
part of the vehicle which is damaged by
adding or applying chemicals and/or
solvents other than those approved or
recommended by SUBARU.
&Before checking or servicing
in the engine compartment
WARNING
.Always stop the engine and apply
the parking brake to prevent the
vehicle from moving.
.Always let the engine cool down.
Engine parts become very hot
when the engine is running and
remain hot for some time after the
engine has stopped.
.Do not spill engine oil, engine
coolant, brake fluid or any other
fluid on hot engine components.
This may cause a fire.
.When the ignition switch is in the
“ON”position, the cooling fan
may operate suddenly even when
the engine is stopped. If your
body or clothes come into con-
tact with a rotating fan, that could
result in serious injury. To avoid
risk of injury, perform the follow-
ing precautions.
–Models with push-button start
system:
Always turn the push-button
ignition switch to the“OFF”
position and confirm that theoperation indicator on the
switch is turned off. Then take
the access key fob out from
the vehicle.
–Models without push-button
start system:
Always remove the key from
the ignition switch.
.Before performing any servicing
on a vehicle equipped with a
remote engine start system (a
dealer option) temporarily place
that system in the service mode
to prevent it from unexpectedly
starting the engine.
Maintenance and service/Maintenance precautions
11-4

(503,1)
北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
&When checking or servicing
in the engine compartment
CAUTION
.Do not contact the drive belt
cover while checking the compo-
nents in the engine compartment.
Doing so may cause your hand to
slip off the cover and result in an
unexpected injury.
.Do not touch the oil filter until the
engine has cooled down comple-
tely. Doing so may result in a burn
or other injury. Note that the oil
filter becomes very hot when the
engine is running and remains
hot for some time after the engine
has stopped.
.Do not apply force on the fender
insulator by placing your handson it, etc. Deformation of the
insulator and its mount may oc-
cur.
&When checking or servicing
in the engine compartment
while the engine is running
WARNING
A running engine can be dangerous.
Keep your fingers, hands, clothing,
hair and tools away from the cooling
fan, drive belt and any other moving
engine parts. Removing rings,
watches and ties is advisable.
Maintenance and service/Maintenance precautions
11-5
11

(507,1)
北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
Engine hoodTo open the hood:
1. If the wiper blades are lifted off the
windshield, return them to their original
position.2. Pull the hood lock release knob under
the instrument panel.
3. Release the secondary hood release
by moving the lever between the front grille
and the hood toward the left.
4. Lift up the hood.
To close the hood:
1. Lower the hood to a height of approxi-
mately 11.8 in (30 cm) above its closed
position and then let it drop.
2. After closing the hood, be sure the
hood is securely locked.
If this does not close the hood, release it
from a slightly higher position. Do not push
the hood forcibly 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 in-
jury.
CAUTION
.When you open the engine hood,
do not stand the wiper blades up.
Furthermore, while the hood is
open, do not operate the wind-
shield wipers. Doing so could
result in damage to the engine
hood and wiper blades.
.Be extremely careful not to catch
fingers or other objects when
closing the engine hood.
.Do not push the hood forcibly to
close it. It could deform the metal.
.Be extremely careful opening the
engine hood when the wind is
strong. The engine hood could
close suddenly, possibly causing
injuries from slamming.
.Do not install accessories other
than genuine SUBARU parts to
–CONTINUED–
Maintenance and service/Engine hood
11-9
11

(511,1)
北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
Engine oil
CAUTION
.If the level gauge is not pulled out
easily, twist the level gauge right
and left, then pull it out. Other-
wise, you may be injured acci-
dentally straining yourself.
.Use only engine oil with the
recommended grade and vis-
cosity.
.Be careful not to spill engine oil
when adding it. If oil touches the
exhaust pipe, it may cause a bad
smell, smoke, and/or a fire. If
engine oil gets on the exhaust
pipe, be sure to wipe it off.&Engine oil consumptionSome engine oil will be consumed while
driving. The rate of consumption can be
affected by such factors as transmission
type, driving style, terrain and tempera-
ture. Under the following conditions, oil
consumption can be increased and thus
require refilling between maintenance in-
tervals:
.When the engine is new and within the
break-in period.When the engine oil is of lower quality
.When the incorrect oil viscosity is used
.When engine braking is employed
(repeatedly)
.When the engine is operated at high
engine speeds (for extended periods of
time)
.When the engine is operated under
heavy loads (for extended periods of time)
.When the engine idles for extended
periods of time
.When the vehicle is operated in stop
and go and/or heavy traffic situations
.When the vehicle is used under severe
thermal conditions
.When the vehicle accelerates and
decelerates frequently
Under these or similar conditions, you
should check your oil at least every 2nd
fuel fill-up and change your engine oil more
frequently. Different drivers in the same
car may experience different results. If
your oil consumption rate is greater than
expected, contact your authorized
SUBARU retailer who may perform a test
under controlled conditions.
&Checking the oil level1. Park the vehicle on a level surface and
stop the engine. If you check the oil level
just after stopping the engine, wait a few
minutes for the oil to drain back into the oil
pan before checking the level.STI
1) Oil level gauge
2) Oil filler cap
–CONTINUED–Maintenance and service/Engine oil
11-13
11

(512,1)
北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
Except STI
1) Oil level gauge
2) Oil filler cap
3) Oil filter
CAUTION
If the level gauge is not pulled out
easily, twist the level gauge right and
left, then pull it out. Otherwise, you
may be injured accidentally strain-
ing yourself.
2. Pull out the level gauge, wipe it clean,
and insert it again.
3. Be sure the level gauge is correctly
inserted until it stops.
STI
1) Notch
2) Full level
3) Low level
4) Approximately 1.1 US qt (1.0 liter, 0.9 Imp
qt) from low level to full level
Except STI
1) Full level
2) Low level
3) Approximately 1.1 US qt (1.0 liter, 0.9 Imp
qt) from low level to full level4. Pull out the oil level gauge again.
5.STI:
Check the oil level on the gauge. If the oil
level is below the low level mark, add oil so
that the full level is reached.
Except STI:
Check the oil levels on both sides of the
level gauge. Judge the engine oil level by
the lowest of the two levels. If the oil level is
below the low level mark, add oil so that
the full level is reached.
Maintenance and service/Engine oil
11-14