2004 SUBARU IMPREZA transmission

11 -3 1
Maintenance and service
– CONTINUED –
Automatic transmission fluid !Checking the fluid level
The automatic transmission fluid expands largely as
its temperature rises; the fluid level differs according to
fluid temperature. Therefore, there are two different
scales for checking the level of hot fluid and cold fluid
on the dipstick.
Though the fluid level can be checked without warm-
ing up the fluid on the “COLD” range, we recommend
checking the fluid level when the fluid is at operating
temperature. ! Checking the fluid level when the fluid is hot
1. Drive the vehicle several miles to raise the temper-
ature of the transmission fluid up to normal operating
temperature; 158 to 176 °F (70 to 80 °C) is normal.
2. Park the vehicle on a level surface and set the park-
ing brake.
3. First shift the selector lever in each position. Then
shift it in the “P” position, and run the engine at idling
speed. 1) Yellow handle
HGB056JB
1

11 - 3 2
Maintenance and service
A) HOT range
B) COLD range
1) Upper level
2) Lower level
4. Pull out the dipstick and check the fluid level on the
gauge. If it is below the lower level on the “HOT”
range, add the recommended automatic transmission
fluid up to the upper level. ! Checking the fluid level when the fluid is cold
When the fluid level has to be checked without time to
warm up the automatic transmission, check to see that
the fluid level is between the lower level and upper lev-
el on the “COLD” range. If it is below that range, add fluid up to the upper level. Be careful not to overfill. !
Recommended fluid
“Dexron III” Type Automatic Transmission FluidLF
LF
1 2
12
B A
HGB061BB

11 -3 7
Maintenance and service
– CONTINUED –
Be careful not to burn yourself because the flu-id may be hot.
"When power steering fluid is being added,
use only clean fluid, and be careful not to allow
any dirt into the tank. And never use different
brands together.
" Avoid spilling fluid when adding it in the tank.
! Recommended fluid
“Dexron III” Type Automatic Transmission Fluid
Brake fluid !Checking the fluid level
1) “MAX” level mark
2) “MIN” level mark
Check the fluid level monthly.
Check the fluid level on the outside of the reservoir. If
the level is below “MIN”, add the recommended brake
fluid to “MAX”.
Use only brake fluid from a sealed container.
MAXMAX
MINMIN
HGB056GB
1 2

11 -4 1
Maintenance and service
– CONTINUED –
tact your SUBARU dealer. !Checking the brake pedal reserve dis- tance
1) More than 2.56 in (65 mm)
Depress the pedal with a force of approximately 66 lb
(294 N, 30 kg) and measure the distance between the
upper surface of the pedal pad and the floor.
When the measurement is smaller than the specifica-
tion, or when the pedal does not operate smoothly,
contact with your SUBARU dealer.Clutch pedal (MT vehicles)
Check the clutch pedal free play and reserve distance
according to the maintenance schedule in the “War-
ranty and Maintenance Booklet”. ! Checking the clutch function
Check the clutch engagement and disengagement.
1. With the engine idling, check that there are no ab-
normal 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 cou-
ple without any sign of slippage.
1
HSB050BB

12-2
Specifications
SpecificationsSpecifications
These specifications are subject to change without notice. !
Dimensions
in (mm)
*1: Measured with vehicle empty
AT: Automatic transmission
MT: Manual transmission
ItemSedanWagon
2.5-liter2.0-liter (Turbo)2.5-liter (Turbo)2.5-liter2.0-liter (Turbo)
RSWRXWRX-STiTSOUTBACK SPORTWRX
Drive systemAWD
Transmission typeATMTATMTMTATMTATMTATMT
Overall length173.8 (4415)
Overall widthSedan68.5 (1740)–
Wagon–66.7 (1695)67.3 (1710)66.7 (1695)
Overall heightWithout
roofrail56.7 (1440)56.3
(1430)57.7 (1465)58.1 (1475)57.7 (1465)
With roofrail–58.5 (1485)58.9 (1495)58.5 (1485)
Wheel base99.4 (2525)100
(2540)99.4 (2525)
TreadFront58.5 (1485)58.7
(1490)57.7 (1465)57.5 (1460)57.7 (1465)
Rear58.1 (1475)58.3 (1480)58.5
(1485)57.3 (1455)
Ground clearance *15.9 (150)6.1 (155)5.7 (145)5.9 (150)6.3 (160)6.1 (155)

12-3
Specifications
– CONTINUED –
!Engine
! Electrical system
AT: Automatic transmission
MT: Manual transmission
Engine modelEJ251(2.5-liter, SOHC, non-turbo)EJ205 (2.0-liter, DOHC, turbo)EJ257 (2.5-liter, DOHC, turbo)
Engine typeHorizontally opposed, liquid cooled 4 cylinder, 4-stroke gasoline engine
Displacement cu in. (cc)150 (2,457)122 (1,994)150 (2,457)
Bore × Stroke in. (mm)3.9 × 3.1 (99.5 × 79.0)3.6 × 2.9 (92.0 × 75.0)3.9 × 3.1 (99.5 × 79.0)
Compression ratio10.0 : 18.0 : 18.2 : 1
Firing order1 – 3 – 2 – 4
Battery type and
capacity (5HR)MT12V-48AH (55D23L)
ATWith 2.5-liter engine12V-52AH (75D23L)
With 2.0-liter turbo engine12V-52AH (65D23L)
Alternator2.5-liter and 2.0-liter turbo engine12V – 75A
2.5-liter turbo engine12V – 90A
Spark plugs2.5-liter engineRC10YC4 (Champion)
BKR6E-11 (NGK)
BKR5E-11 (NGK)
2.0-liter turbo enginePFR6G (NGK)
2.5-liter turbo engineIFLR6B (NGK)

12-4
Specifications !
Capacities
AT: Automatic transmission
MT: Manual transmission
Fuel tank15.9 US gal (60 liters, 13.2 Imp gal)
Engine oil2.5-liter engine model4.2 US qt (4.0 liters, 3.5 Imp qt)
2.0-liter turbo engine model4.8 US qt (4.5 liters, 4.0 Imp qt)
2.5-liter turbo engine model
Transmission oil (MT)5 speed3.7 US qt (3.5 liters, 3.1 Imp qt)
6 speed4.3 US qt (4.1 liters, 3.6 Imp qt)
Transmission oil (AT)10.0 US qt (9.5 liters, 8.4 Imp qt)
Power steering gear fluid0.7 US qt (0.7 liter, 0.6 Imp qt)
Engine coolant2.5-liter engine modelMT7.4 US qt (7.0 liters, 6.2 Imp qt)
AT7.3 US qt (6.9 liters, 6.1 Imp qt)
2.0-liter turbo engine modelMT8.1 US qt (7.7 liters, 6.8 Imp qt)
AT8.0 US qt (7.6 liters, 6.7 Imp qt)
2.5-liter turbo engine modelMT8.1 US qt (7.7 liters, 6.8 Imp qt)

14-2
Index
A
ABS (Anti-lock Brake System)
...............................7-30
Warning light ................................................. 3-23, 7-31
Accessories ......................................................... 5-3, 11-63
Accessory power outlet ...................................6-9, 6-11
Active head restraint .................................................. 1-6
Air cleaner element ..................................................... 11-23
Air conditioner operation ..........................................4-9
Air filtration system ..................................................... 4-20
Air flow selection .......................................................... 4-2
Aluminum wheels ........................................................ 11-53
Ambient temperature gauge .........................3-11, 3-18
Antenna system ........................................................... 5-2
Anti-lock Brake System (ABS) ...............................7-30
Arming the system ...................................................... 2-15
Armrest ............................................................................ 1-9
Ashtray ............................................................................. 6-12
AT OIL TEMPerature warning light ......................3-22
Audio set ......................................................................... 5-3
Auto-dimming mirror /compass .............................3-44
Automatic/Emergency Locking Retractor (A/ELR) ....................................................................... 1-15
Automatic transmission ............................................. 7-21
Capacities ................................................................. 12-4
Fluid ............................................................................ 11-31
Selector lever .......................................................... 7-22
Shift lock release ................................................... 7-26Temperature warning light
.................................3-22
BBattery ............................................................................... 11-58
Jump starting ........................................................... 9-14
Replacement (Remote keyless entry system) .................................................................... 2-9
Brake Booster ....................................................................... 11-40
Fluid ............................................................................. 11-37
Pad and lining .......................................................... 11-42
Pedal ........................................................................... 11-40
Brake system ................................................................. 7-29
Warning light ............................................................ 3-24
Braking .............................................................................. 7-28
Breaking-in of new brake pads and linings .11-43
Tips .............................................................................. 7-28
Brake pedal
Free play .................................................................... 11-40
Reserve distance ................................................... 11-41
Bulb
Chart ............................................................................ 12-9
Replacing ................................................................... 11-64
C
Capacities ........................................................................ 12-4