engine SUBARU WRX 2018 Owners Manual

(521,1)
北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
Front differential gear oil
(CVT models) and rear differ-
ential gear oilIt is not necessary to check the gear oil
level. Check that there are no cracks,
damage or leakage. However, have the oil
inspected by your SUBARU dealer ac-
cording to the maintenance schedule in
the“Warranty and Maintenance Booklet”.
Consult your SUBARU dealer for details.&Recommended grade and
viscosityEach oil manufacturer has its own base
oils and additives. Never use different
brands together. For details, refer to
“Manual transmission, front differential
and rear differential gear oil”F12-6.
CAUTION
Using a differential gear oil other
than the specified oil may cause a
decline in vehicle performance.
Power steering fluid (STI)&Checking the fluid levelThe power steering fluid expands greatly
as its temperature rises; the fluid level
differs according to fluid temperature.
Therefore, the reservoir tank has two
different checking ranges for hot and cold
fluids.
Check the power steering fluid level
monthly.
1. Park the vehicle on a level surface, and
stop the engine.
2. Check the fluid level of the reservoir
tank.
When the fluid is hot after the vehicle has
been run: Check that the oil level is
between“HOT MIN”and“HOT MAX”onthe surface of the reservoir tank.
When the fluid is cool before the vehicle is
run: Check that the oil level is between
“COLD MIN”and“COLD MAX”on the
surface of the reservoir tank.
3. If the fluid level is lower than the
applicable“MIN”line, add the recom-
mended fluid as necessary to bring the
level between the“MIN”and“MAX”line.
If the fluid level is extremely low, it may
indicate possible leakage. Consult your
SUBARU dealer for an inspection.
WARNING
Be careful not to burn yourself
because the fluid may be hot.
CAUTION
.When you add power steering
fluid, use only clean fluid, and
be careful not to allow any dirt
into the tank. And never use
different brands together.
.Be careful not to spill power
steering fluid when adding it. If
power steering fluid touches the
exhaust pipe, it may cause a bad
smell, smoke, and/or a fire. If
power steering fluid gets on the
–CONTINUED–
Maintenance and service/Front differential gear oil (CVT models) and rear differential gear oil
11-23
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(524,1)
北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
Check the fluid level on the outside of the
reservoir. Because this reservoir is used
for both the brake and clutch systems and
has chambers for each system, be sure to
check the fluid level for the clutch system
at theinboard side of the reservoir
(shaded area in the illustration). If the fluid
level is below“MIN”, add the recom-
mended clutch fluid to“MAX”.
Use only clutch fluid from a sealed contain-
er.&Recommended clutch fluidRefer to“Fluids”F12-7.
CAUTION
Never use different brands of clutch
fluid together. Also, avoid mixing
DOT 3 and DOT 4 brake fluids even if
they are the same brand.
Brake boosterIf the brake booster does not operate as
described in the following, have it checked
by your SUBARU dealer.
1. With the engine off, depress the brake
pedal several times, applying the same
pedal force each time. The distance the
pedal travels should not vary.
2. With the brake pedal depressed, start
the engine. The pedal should move slightly
down to the floor.
3. With the brake pedal depressed, stop
the engine and keep the pedal depressed
for 30 seconds. The pedal height should
not change.
4. Start the engine again and run for
approximately one minute then turn it off.
Depress the brake pedal several times to
check the brake booster. The brake
booster operates properly if the pedal
stroke decreases with each depression.NOTEWhen you depress the brake pedal
strongly or suddenly, you might feel
that lighter depression of the brake
pedal generates a greater braking
force. However, even though these
occur, they do not indicate any mal-
functions, and the brake assist systemis operating properly.
Brake assist is not a system that brings
more braking ability to the vehicle
beyond its breaking capability.
Maintenance and service/Brake booster
11-26

(525,1)
北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
Brake pedalCheck the brake pedal free play and
reserve distance according to the main-
tenance schedule in the“Warranty and
Maintenance Booklet”.&Checking the brake pedal free
play1) 0.02–0.11 in (0.5–2.7 mm)Stop the engine and firmly depress the
brake pedal several times. Lightly pull the
brake pedal up with one finger to check the
free play with a force of less than 2 lbf (10
N, 1 kgf).
If the free play is not within proper
specification, contact your SUBARU deal-
er.
&Checking the brake pedal re-
serve distance1) More than 2.56 in (65 mm)Depress the pedal with a force of approxi-
mately 66 lbf (294 N, 30 kgf) and measure
the distance between the upper surface of
the pedal pad and the floor.
When the measurement is smaller than
the specification, or when the pedal does
not operate smoothly, contact with your
SUBARU dealer.
Clutch pedal (MT models)Check the clutch pedal free play according
to the maintenance schedule in the“War-
ranty and Maintenance Booklet”.&Checking the clutch functionCheck the clutch engagement and disen-
gagement.
1. With the engine idling, check that there
are no abnormal noises when the clutch
pedal is depressed, and that shifting into
1st or reverse feels smooth.
2. Start the vehicle by releasing the pedal
slowly to check that the engine and
transmission smoothly couple without
any sign of slippage.
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Maintenance and service/Brake pedal
11-27
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(526,1)
北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
&Checking the clutch pedal
free play1) 0.16–0.43 in (4.0–11.0 mm)Lightly depress the clutch pedal down with
your finger until you feel resistance, and
check the free play.
If the free play is not within proper
specification, contact your SUBARU deal-
er.
Hill start assist systemEnsure that the Hill start assist system
operates properly under the following
circumstances.
1. Stop the vehicle on an uphill grade by
depressing the brake pedal (all models)
and clutch pedal (MT models only), with
the engine running.
2. Make sure that the vehicle does not
move backward for several seconds after
the brake pedal is released.
3. Then make sure the vehicle starts
climbing the grade by following the normal
starting procedures.
If the Hill start assist system does not
operate as described above, contact your
SUBARU dealer.
Replacement of brake pad
and liningThe disc brakes have audible wear in-
dicators on the brake pads. If the brake
pads wear close to their service limit, the
wear indicator makes a very audible
scraping noise when the brake pedal is
applied.
If you hear this scraping noise each time
you apply the brake pedal, have the brake
pads serviced by your SUBARU dealer as
soon as possible.
Maintenance and service/Hill start assist system
11-28

(536,1)
北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
Alloy wheelsAlloy wheels can be scratched and da-
maged easily. Handle them carefully to
maintain their appearance, performance,
and safety.
.When any of the wheels are removed
and replaced for tire rotation or to change a
flat tire, always check the tightness of the
wheel nuts after driving approximately 600
miles (1,000 km). If any nut is loose,
tighten it to the specified torque.
.Never apply oil to the threaded parts,
wheel nuts, or tapered surface of the
wheel.
.Never let the wheel rub against sharp
protrusions or curbs.
.When wheel nuts, balance weights, or
the center cap is replaced, be sure to
replace them with genuine SUBARU parts
designed for alloy wheels.
Windshield washer fluid
CAUTION
Never use engine coolant as washer
fluid because it could cause paint
damage.Windshield washer fluid warning in-
dicator
When there is only a small amount of
washer fluid remaining, the windshield
washer fluid warning indicator will illumi-
nate. When this occurs, refill the washer
fluid as follows.
Remove the washer tank filler cap, then
add windshield washer fluid until it reaches
the“FULL”mark on the tank. If windshield
washer fluid is unavailable use clean
water.
In areas where water freezes in winter, use
an anti-freeze type windshield washer
fluid. SUBARU Windshield Washer Fluid
contains 58.5% methyl alcohol and 41.5%
surfactant, by volume. Its freezing tem-
perature varies according to how much it is
diluted, as indicated in the following table.
Maintenance and service/Alloy wheels
11-38

(541,1)
北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
1) Spare fusesThe other one (main fuse box) is housed in
the engine compartment. Also, the spare
fuses are stored in the fuse box cover.The fuse puller is stored in the main fuse
box in the engine compartment.
1) Good
2) BlownIf any lights, accessories or other electrical
controls do not operate, inspect the corre-
sponding fuse. If a fuse has blown, replace
it.
1. Turn the ignition switch to the“LOCK”/
“OFF”position and turn off all electrical
accessories.
2. Remove the cover.
3. Determine which fuse may be blown.
Look at the back side of each fuse box
cover and refer to“Fuses and circuits”
F12-10.
4. Pull out the fuse with the fuse puller.
5. Inspect the fuse. If it has blown,
replace it with a spare fuse of the same
rating.
6. If the same fuse blows again, this
indicates that its system has a problem.
Contact your SUBARU dealer for repairs.
Maintenance and service/Fuses
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(544,1)
北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
the headlight assembly by turning it clock-
wise.
4. Replace the bulb with a new one. At
this time, use care not to touch the bulb
surface.
5. To install the bulb to the headlight
assembly, turn it to the reverse direction
until it clicks.
6. Reconnect the electrical connector.
7.Left-hand side:Set the washer fluid
filler pipe to the original place and secure it
by a clip.
Right-hand side:Install the air intake duct
with clips.&Low beam headlight*, front
side marker light, parking
light* and front turn signal
light**: models without LED headlightsNOTE.If headlight aiming is required, con-
sult your SUBARU dealer for proper
adjustment of the headlight aim.
.It may be difficult to replace the
bulbs. Have the bulbs replaced by your
SUBARU dealer if necessary.
1. Start the engine and turn the steering
wheel fully in the opposite direction of the
bulb to be replaced.2. Stop the engine.
3. Remove the clips from the mud guard.4. Pull off the mud guard.!Low beam headlight
1. Disconnect the electrical connector
from the bulb as pushing the tab.
Maintenance and service/Replacing bulbs
11-46

(555,1)
北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
Specifications........................................................12-2
Dimensions...........................................................12-2
Engine..................................................................12-3
Fuel......................................................................12-3
Engine oil.............................................................12-4
Manual transmission, front differential and rear
differential gear oil..............................................12-6
Fluids...................................................................12-7
Engine coolant......................................................12-7
Electrical system..................................................12-8Tires.....................................................................12-8
Temporary spare tires...........................................12-9
Brake disc............................................................12-9
Fuses and circuits..............................................12-10
Fuse panel located in the passenger
compartment...................................................12-10
Fuse panel located in the engine compartment ... 12-12
Bulb chart............................................................12-14
Vehicle identification..........................................12-16
Specifications
12

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北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
&EngineModel
STI Except STI
Engine modelEJ25
(2.5 L, DOHC, turbo)FA20
(2.0 L, DOHC, turbo)
Engine type Horizontally opposed, liquid cooled 4 cylinder, 4-stroke petrol engine
Displacement cu-in (cc) 150 (2,457) 122 (1,998)
Bore6Stroke in (mm) 3.9263.11 (99.5679.0) 3.3963.39 (86.0686.0)
Compression ratio 8.2 : 1 10.6 : 1
Firing order1–3–2–4&Fuel
NOTEThe engine is designed to operate using unleaded gasoline.
Model Fuel Fuel tank capacity
STI
93 AKI (98 RON) or higher*
1
15.9 US gal (60 liters, 13.2 Imp gal)
Except STI
91 AKI (95 RON) or higher*
2
*1: If unleaded gasoline with an octane rating of 93 AKI (98 RON) is not available, unleaded gasoline with an octane rating of 91 AKI (95 RON) may be
used with no detriment to engine durability or driveability.
*2: If unleaded gasoline with an octane rating of 91 AKI (95 RON) is not available, unleaded gasoline with an octane rating of 87 AKI (90 RON) or higher
may be used.
–CONTINUED–
Specifications/Specifications
12-3
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(558,1)
北米Model "A1700BE-B" EDITED: 2017/ 10/ 11
&Engine oilFor the checking, adding and replacing procedure or other details, refer to“Engine oil”F11-13.NOTEHave the procedure for changing the engine oil and oil filter performed by a properly-trained expert. It is recommended that
you have this service performed by your SUBARU dealer.
!Approved engine oil
Always use the SUBARU approved engine oil. For further details, please contact your SUBARU dealer.
If the approved engine oil is unavailable, use the alternative engine oil described on the next page.
Specifications/Specifications
12-4