Subaru Legacy III (2000-2003 year). Manual — part 852

PS-96

POWER ASSISTED SYSTEM (POWER STEERING)

GENERAL DIAGNOSTIC TABLE

Trouble

Possible cause

Corrective action

Hiss noise (continuous)
While engine is running.

Relief valve emits operating sound when steering wheel is
completely turned in either direction. (Don't keep this con-
dition over 5 seconds.)

Normal

Relief valve emits operating sound when steering wheel is
not turned. This means that the relief valve is faulty.

Defective
Replace oil pump.

Rattling noise (intermittent) While
engine is running.

Interference with adjacent parts

Check clearance.
Correct if necessary.
<Ref. to PS-76, INSPECTION,
Pipe Assembly.>

Loosened installation of oil pump, oil tank, pump bracket,
gearbox or crossmember

Retighten.

Loosened installation of oil pump pulley or other pulley(s)

Retighten.

Loosened linkage or play of steering or suspension Loos-
ened tightening of joint or steering column

Retighten or replace.

Sound generates from the inside of gearbox or oil pump.

Replace bad parts of the gearbox
or oil pump.

Knocking
When turning steering wheel in
both direction with small angle
repeatedly at engine ON or OFF.

Excessive backlash
Loosened lock nut for adjusting backlash

Adjust and retighten.

Loosened tightening or play of tie-rod, tie-rod end

Retighten or replace.

Grinding noise (continuous)
While engine is running.

Vane pump aeration

Inspect and retighten fluid line
connection.
Refill fluid and vent air.

Vane pump seizing

Replace oil pump.

Pulley bearing seizing of oil pump

Replace oil pump.

Folded hose, flat pipe

Replace.

Squeal, squeak (intermittent or
continuous)
While engine is running.

Maladjustment of pulley belt
Damaged or charged pulley belt
Unequal length of pulley belts

Adjust or replace.
(Replace two belts as a set.)

Run out or soilage of V-groove surface of oil pump pulley

Clean or replace.

Sizzling noise (continuous)
While engine is running.

Fluid aeration

Fix wrong part causing aeration.
Replace fluid and vent air.

Damaged pipe of gearbox

Replace pipe.

Abnormal inside of hose or pipe
Flat hose or pipe

Rectify or replace.

Abnormal inside of oil tank

Replace.

Removed oil tank cap

Install cap.

Whistle (continuous)
While engine is running.

Abnormal pipe of gearbox or abnormal inside of hose

Replace bad parts of gearbox or
hose.

Whine or growl (continuous or
intermittent)
While engine is running with/
without steering turned.

Loosened installation of oil pump, oil pump bracket

Retighten.

Abnormal inside of oil pump, hose

Replace oil pump, hose, if the
noise can be heard when running
as well as stand still.

Torque converter growl, air conditioner compression growl

Remove power steering pulley
belt and confirm.

Creaking noise (intermittent)
While engine is running with
steering turned.

Abnormal inside of gearbox

Replace bad parts of gearbox.

Abnormal bearing for steering shaft

Apply grease or replace.

Generates when turning steering wheel with brake (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.

Too low engine speed at start

Adjust and instruct customers.

Vane pump aeration

Fix wrong part.
Vent air.

Damaged valve in oil pump, gearbox

Replace oil pump, bad parts of
gearbox.

Looseness of play of steering, suspension parts

Retighten.

PS-97

POWER ASSISTED SYSTEM (POWER STEERING)

GENERAL DIAGNOSTIC TABLE

2. MEASUREMENT OF STEERING EFFORT

Step

Value

Yes

CHECK STEERING EFFORT.
1) Stop the vehicle on a concrete road.
2) Start the engine.
3) Idle the engine.
4) Install spring scale on the steering wheel.
5) Pull spring scale at an right angle to the

steering wheel, and measure both right and
left steering wheel effort.
Is the steering effort less than the specified
value?

NOTE:

When turning steering more quickly than nec-
essary from a direction to the other direction at
an engine speed over 2,000 rpm, steering effort
may be heavy. This is caused by flow charac-
teristic of oil pump and is not a problem.

29.4 N (3.0 kgf, 6.6 lb)

Go to step 2.

Adjustment back-
lash.

CHECK STEERING EFFORT.
1) Stop the engine.
2) Pull spring scale at an right angle to the

steering wheel, and measure both right and
left steering wheel effort.
Is the steering effort less than the specified
value?

29.4 N (3.0 kgf, 6.6 lb)

Go to step 3.

Adjustment.

CHECK STEERING WHEEL EFFORT.
1) Remove universal joint.
2) Measure steering wheel effort.

Is the maximum force steering wheel effort
less than the specified value?

2.26 N (0.23 kgf, 0.51 lb)

Go to step 4.

Check, adjust and
replace if neces-
sary.

CHECK STEERING WHEEL EFFORT.
Measure steering wheel effort.
Is the fluctuation width less than the specified
value?

1.08 N (0.11 kgf, 0.24 lb)

Go to step 5.

Check, adjust and
replace if neces-
sary.

CHECK UNIVERSAL JOINT.
Measure folding torque of the joint (short
yoke). <Ref. to PS-26, INSPECTION, Univer-
sal Joint.>
Is the fluctuation width less than the specified
value?

8.43 N (0.86 kgf, 1.90 lb)

Go to step 6.

Replace with new
one.

CHECK UNIVERSAL JOINT.
Measure folding torque of the joint (long yoke).
<Ref. to PS-26, INSPECTION, Universal
Joint.>
Is the folding torque less than the specified
value?

5.49 N (0.56 kgf, 1.23 lb)

Go to step 7.

Replace with new
one.

CHECK FRONT WHEEL.
Is there any trouble indicated in "Value" col-
umn?

Unsteady revolution or rattling
of front wheels. Dragging of
brake.

Inspect, readjust
and replace if nec-
essary.

Go to step 8.

CHECK TIE-ROD ENDS.
Remove the tie-rod ends.
Is there any trouble indicated in "Value" col-
umn?

Unsteady revolution or rattling
of tie-rod ends of suspension.

Inspect and
replace if neces-
sary.

Go to step 9.

CHECK BALL JOINT.
Is there any trouble indicated in "Value" col-
umn?

Unsteady revolution or rattling
of ball joints of suspension.

Inspect and
replace if neces-
sary.

Go to step 10.

PS-98

POWER ASSISTED SYSTEM (POWER STEERING)

GENERAL DIAGNOSTIC TABLE

CHECK GEARBOX.
Measure rotating of gearbox. <Ref. to PS-48,
TURNING RESISTANCE OF GEARBOX,
INSPECTION, Steering Gearbox [LHD
MODEL].>
Is the measured rotating resistance same with
the specified value?

11.18 N (1.14 kgf, 2.51 lb) or
less around center position
and 15.79 N (1.61 kgf, 3.55 lb)
or less in all positions within
20% difference between clock-
wise and counterclockwise?

Go to step 11.

Readjust back-
lash, and if ineffec-
tive, replace bad
parts.

CHECK GEARBOX.
Measure sliding of gearbox. <Ref. to PS-47,
SERVICE LIMIT, INSPECTION, Steering
Gearbox [LHD MODEL].>
Is the measured rotating resistance within the
specified range?

304 N (31 kgf, 68 lb) or less
with 20% difference between
left and right direction?

Steering effort is
normal.

Readjust back-
lash, and if ineffec-
tive, replace bad
parts.

Step

Value

Yes

FUJI HEAVY INDUSTRIES LTD.

G2300GE7

2003 LEGACY SERVICE MANUAL

QUICK REFERENCE INDEX

BODY SECTION

This service manual has been prepared
to provide SUBARU service personnel
with the necessary information and data
for the correct maintenance and repair
of SUBARU vehicles.
This manual includes the procedures
for maintenance, disassembling, reas-
sembling, inspection and adjustment of
components and diagnostics for guid-
ance of experienced mechanics.
Please peruse and utilize this manual
fully to ensure complete repair work for
satisfying our customers by keeping
their vehicle in optimum condition.
When replacement of parts during
repair work is needed, be sure to use
SUBARU genuine parts.

All information, illustration and specifi-
cations contained in this manual are
based on the latest product information
available at the time of publication
approval.

HVAC SYSTEM
(HEATER, VENTILATOR AND A/C)

HVAC SYSTEM (DIAGNOSTICS)

AIRBAG SYSTEM

AIRBAG SYSTEM (DIAGNOSTICS)

SEAT BELT SYSTEM

LIGHTING SYSTEM

WIPER AND WASHER SYSTEMS

ENTERTAINMENT

COMMUNICATION SYSTEM

COM

GLASS/WINDOWS/MIRRORS

BODY STRUCTURE