Subaru IMPREZA 2002 Service Manual page 518

GENERAL DIAGNOSTIC TABLE
POWER ASSISTED SYSTEM (POWER STEERING)
Retighten.
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Possible cause
Corrective action
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Trouble
Relief valve emits operating sound when steering wheel is
completely turned in either direction. (Don't keep this con-
dition over 5 seconds.)
Normal
Hiss noise (continuous)
While engine is running.
Relief valve emits operating sound when steering wheel is
not turned. This means that the relief valve is faulty.
Defective
Replace the oil pump.
Check the clearance.
Correct if necessary.
<Ref. to PS-52, INSPECTION,
Pipe Assembly.>
Retighten.
Interference with adjacent parts
Loosened installation of oil pump, oil tank, pump bracket,
gearbox or crossmember
Loosened installation of oil D u m Dullev or other DulleW
Rattling noise (intermittent)
While engine is running.
~~~
Loosened linkage or play of steering or suspension Loos-
ened tightening of joint or steering column
Retighten or replace.
Replace the bad parts of the
aearbox or oil wmu.
Sound generates from the inside of gearbox or oil pump.
Excessive backlash
Loosened lock nut for adjusting backlash
Adjust and retighten.
Knocking
When turning steering wheel in
both direction with small angle
repeatedly at engine ON or OFF.
Loosened tightening or play of tie-rod, tie-rod end
Retighten or replace.
Inspect and retighten the fluid
line connection.
Vane pump aeration
Grinding noise (continuous)
While engine is running.
Vane pump seizing
Pulley bearing seizing of oil pump
Folded hose. flat DiDe Replace.
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Maladjustment of pulley belt
Damaged or charged pulley belt
Unequal length of pulley belts
Run out or soilage of V-groove surface of oil pump pulley
Adjust or replace.
(Replace two belts as a set.)
Clean or redace.
Squeal, squeak (intermittent or
continuous)
While engine is running.
Fix the wrong part causing aera-
tion.
Redace the DiDe.
Fluid aeration
Sizzling noise (continuous)
While engine is running.
Damaged pipe of gearbox
Abnormal inside of hose or pipe
Flat hose or DiDe
~
Rectify or replace.
Abnormal inside of oil tank
Replace.
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Removed oil tank cap
Abnormal pipe of gearbox or abnormal inside of hose
Whistle (continuous)
While engine is running.
or hose.
RetiQhten.
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Loosened installation of oil Duma oil Dump bracket
Whine or growl (continuous
or
intermittent)
While engine is running with/
without steering turned.
Replace the oil pump, hose, if the
noise can be heard when running
Remove the power steering pul-
ley belt and confirm.
Abnormal inside of oil pump, hose
Torque converter growl, air conditioner compression growl
Abnormal inside of gearbox
Replace the bad parts of gear-
is released, it is normal.
Creaking noise (intermittent)
While engine is running with
steering turned.
Abnormal bearing for steering shaft
Generates when turning steering wheel with brake (ser-
vice or Darkina) amlied.
PS-76