Subaru LEGACY 2006 Manual page 4059

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POWER ASSISTED SYSTEM (POWER STEERING)
2. MEASUREMENT OF STEERING EFFORT
Step
1 CHECK STEERING EFFORT.
1) Stop the vehicle on paved road.
2) Start the engine.
3) Run the engine at idle.
4) Install a spring scale on the steering wheel.
5) Pull the spring scale at a right angle to the
steering wheel, and measure both right and left
steering wheel efforts.
NOTE:
When turning the steering more quickly than
necessary from a direction to the other direction
at an engine speed over 2,000 rpm, steering ef-
fort may be heavy. This is caused by flow char-
acteristic of the fluid in the oil pump and is not a
defect.
2 CHECK STEERING EFFORT.
1) Stop the engine.
2) Pull the spring scale at a right angle to the
steering wheel, and measure both right and left
steering wheel efforts.
3 CHECK STEERING WHEEL EFFORT.
1) Remove the universal joint.
2) Measure the steering wheel effort.
4 CHECK STEERING WHEEL EFFORT.
Measure the steering wheel effort.
5 CHECK UNIVERSAL JOINT.
Measure the swing torque of the joint (yoke of
steering column side). <Ref. to PS-15,
INSPECTION, Universal Joint.>
6 CHECK UNIVERSAL JOINT.
Measure the swing torque of the joint (yoke of
gearbox side). <Ref. to PS-15, INSPECTION,
Universal Joint.>
7 CHECK FRONT WHEEL.
Check the front wheels.
8 CHECK TIE-ROD ENDS.
Remove the tie-rod ends.
9 BALL JOINT CHECK.
Remove the ball joint.
10 CHECK GEARBOX.
Measure the rotating of gearbox.
<Ref. to PS-36, TURNING RESISTANCE OF
GEARBOX, INSPECTION, Steering Gear-
box.>
General Diagnostic Table
Check
Is the steering effort less than
29.4 N (3.0 kgf, 6.6 lb)?
Is the steering effort less than
294.2 N (30 kgf, 66.2 lb)?
Is steering effort less than 2.26
N (0.23 kgf, 0.51 lb)?
Is the difference of steering
effort between right and left
less than 20%?
Is the swing torque of the uni-
versal joint less than 7.3 N
(0.74 kgf, 1.64 lb)?
Is the swing torque of the uni-
versal joint less than 3.8 N
(0.39 kgf, 0.86 lb)?
Does the front wheels have
unsteady revolution or rattling,
or does the brake drag?
If the tie-rod ends of suspen-
sion have unsteady revolution
or rattling?
If the ball joints of suspension
have unsteady revolution or
rattling?
Is the rotating resistance of
steering gearbox less than
11.3 N (1.15 kgf, 2.54 lb)? Is
the difference between right
and left sides less than 24%?
PS-58
Yes No
Go to step 2.
Adjust the back-
lash.
Go to step 3. Perform the
adjustment.
Go to step 4. Check, adjust and
replace if neces-
sary.
Go to step 5.
Check, adjust and
replace if neces-
sary.
Go to step 6.
Replace with a
new part.
Go to step 7.
Replace with a
new part.
Inspect, readjust Go to step 8.
and replace if nec-
essary.
Go to step 9.
Inspect and
replace if neces-
sary.
Inspect and Go to step 10.
replace if neces-
sary.
Steering effort is Readjust the back-
normal. lash, and if ineffec-
tive, replace the
faulty parts.