2005 SUBARU IMPREZA WRX alternator

3-22
Instruments and controls
condition has been detected which may damage the
emission control system.
To prevent serious damage to the emission control
system, you should do the following:
yReduce vehicle speed.
y Avoid hard acceleration.
y Avoid steep uphill grades.
y Reduce the amount of cargo, if possible.
y Stop towing a trailer as soon as possible.
The CHECK ENGINE warning light may stop blinking
and come on steadily after several driving trips. You
should have your vehicle checked by an authorized
SUBARU dealer immediately. „ Charge warning light
If this light comes on when the engine is running, it
may indicate that the charging system is not working
properly.
If the light comes on while driving or does not go out
after the engine starts, stop the engine at the first safe
opportunity and check the alternator belt. If the belt is
loose, broken or if the belt is in good condition but the
light remains on, contact your nearest SUBARU deal-
er immediately. „
Oil pressure warning light
If this light comes on when the engine is running, it
may indicate that the engine oil pressure is low and the
lubricating system is not working properly.
If the light comes on while driving or does not go out
after the engine starts, stop the engine at the first safe
opportunity and check the engine oil level. If the oil lev-
el is low, add oil immediately. If the engine oil is at the
proper level but the light remains on, contact your
nearest SUBARU dealer immediately.
Do not operate the engine with the oil pressure
warning light on. This may cause serious en-
gine damage.
„ AT OIL TEMPerature warning
light (for AT vehicles)
The AT oil temperature warning light comes on when
the ignition switch is turned to the “ON” position and
goes out after about two seconds.
If this light comes on when the engine is running, it
may indicate that the automatic transmission fluid tem-
perature is too hot.

11 -2 9
Maintenance and service
– CONTINUED –
Drive belts
1) Power steering pump pulley
2) Air conditioner compressor pulley
3) Crank pulley
The alternator, power steering pump, and air condi-
tioner compressor depend on drive belts. Satisfactory
performance requires that belt tension be correct.
To check belt tension, place a straightedge (ruler)
across two adjacent pulleys and apply a force of 22 lbs
(98 N, 10 kg) midway between the pulleys by using a
spring scale. Belt deflection should be the amount
specified. If a belt is loose, cracked, or worn, contact your SUBARU dealer.
in (mm)
2
3 A
B
1
HSB033BB
Deflection
New belt Used belt
A 0.28 – 0.35 (7.0 – 9.0) 0.35 – 0.43 (9.0 – 11.0)
B 0.30 – 0.33 (7.5 – 8.5) 0.35 – 0.40 (9.0 – 10.0)

12-3
Specifications
– CONTINUED –
„Engine
„ Electrical system
AT: Automatic transmission
MT: Manual transmission
Engine modelEJ253
(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 cc (cu-in)2,457 (150)1,994 (122)2,457 (150)
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 non-turbo engine12V-52AH (75D23L)
With 2.0-liter turbo engine12V-52AH (65D23L)
Alternator2.5-liter non-turbo and
2.0-liter turbo engine12V-75A
2.5-liter turbo engine12V-90A
Spark plugs2.5-liter non-turbo engineFR5AP-11
2.0-liter turbo enginePFR6G (NGK)
2.5-liter turbo engineIFLR6B (NGK)

12-9
Specifications
– CONTINUED –
„Fuse panel located in the engine com- partment
A) FWD socket (AT models except Turbo)
B) Main fuse
C) Engine sensor (Non-turbo models)
A 12
3
C B
4
5 6
78
91011
12
UGC012BB
Fuse panelFuse ratingCircuit
120Ay
Radiator cooling fan (Main)
220AyRadiator cooling fan (Sub)
330AyABS motor
420AyRear window defogger
515AyHazard warning flasher
y Horn
615AyTurn signal lights
710AyAutomatic transmis-
sion control unit
810AyAlternator
915AyHeadlight (right side)
1015AyHeadlight (left side)
1120AyLighting switch
1220AyClock
y Interior light