Subaru 2009 IMPREZA, Service Manual

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PS-53
General Diagnostic Table
POWER ASSISTED SYSTEM (POWER STEERING)
Sizzling noise (continuous)
While engine is running.
Fluid aeration
Fix the faulty part causing aera-
tion.
Replace the fluid and vent air.
Damaged pipe of gearbox Replace the pipe.
Faulty inside of hose or pipe
Flattened hose or pipe
Correct or replace.
Abnormal inside of oil tank Replace.
Removed oil tank cap Install cap.
Whistle (continuous)
While engine is running.
Faulty pipe of gearbox or faulty hose
Replace the faulty parts of the
gearbox or the hose.
Whine or growl (intermittent or
continuous)
While engine is running with/
without steering turned.
Looseness of oil pump, oil pump bracket attachment Retighten.
Fault inside of oil pump or hose
Replace the oil pump or hose, if
the noise can be heard when
vehicle is running as well as
being stopped.
Torque converter growl, air conditioner compression growl
Remove the power steering pul-
ley belt and check.
Grinding noise (continuous)
While engine is running with the
steering turned.
Fault inside of gearbox
Replace the faulty parts of gear-
box.
Faulty steering shaft bearing Apply grease or replace.
Occurs when turning the steering wheel with brakes (ser-
vice or parking) applied. If the noise goes off when brake
is released, it is normal.
Vibration
While engine is running with/
without steering turned.
Engine speed is too low. Adjust, and notify customer.
Air in vane pump
Repair faulty part
Vent air.
Damaged valve in oil pump or gearbox
Replace the faulty parts in gear-
box and oil pump.
Excessive play in steering, looseness of suspension parts Retighten.
Trouble Possible cause Corrective action