Subaru IMPREZA 2002 Service Manual page 520

GENERAL DIAGNOSTIC TABLE
POWER ASSISTED SYSTEM (POWER STEERING)
2.
MEASUREMENT OF STEERING EFFORT
~~
Step
CHECK STEERING EFFORT.
1)Stop the vehicle on a concrete road.
2)Start the engine.
3)ldle the engine.
4)lnstall the spring scale on the steering wheel.
5)Pull the spring scale at an right angle to the
steering wheel, and measure both right and left
steering wheel effort.
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.
1)Stop the engine.
2)Pull the spring scale at an right angle to the
steering wheel, and measure both right and left
steering wheel effort.
I
CHECK STEERING WHEEL EFFORT.
1)Remove the universal joint.
2)Measure the steering wheel effort.
I CHECK STEERING WHEEL EFFORT.
Measure the steering wheel effort.
CHECK UNIVERSAL JOINT.
Measure the folding torque of the joint (yoke of
steering column side). <Ref. to PS-22,
INSPECTION, Universal Joint.>
Measure the folding torque of the joint (yoke of
gearbox side). <Ref. to PS-22, INSPECTION,
Universal Joint.>
I
CHECK FRONT WHEEL.
! CHECK STEERING EFFORT.
i CHECK UNIVERSAL JOINT.
5 CHECK TIE-ROD ENDS.
Remove the tie-rod ends.
3 CHECK BALL JOINT.
I O CHECK GEARBOX.
Measure the rotating of gearbox.
<Ref. to PS-44, TURNING RESISTANCE OF
GEARBOX, INSPECTION, Steering Gear-
box.>
Measure sliding of gearbox.
<Ref. to PS-43, SERVICE LIMIT, INSPEC-
TION, Steering Gearbox.>
I1
CHECK GEARBOX.
Check
Is the steering effort 31.4 N
(3.2 kgf, 7.1 Ib) or less?
Is the steering effort 294.2 N
(30 kgf, 66.2 Ib) or less?
Is the maximum force steering
wheel effort 2.26 N (0.23 kgf,
0.51 Ib) or less?
Is the fluctuation width 1.08 N
(0.1 1 kgf, 0.24 Ib) or less?
Is the folding torque 7.3 N
(0.74 kgf, 1.64 Ib) or less?
Is the folding torque 7.3 N
(0.74 kgf, 1.64 Ib) or less?
Are the front wheels for
unsteady revolution or rattling
and brake for dragging?
Are the tie-rod ends of suspen
sion for unsteady revolution or
ratting?
Are the ball joints of suspen-
sion for unsteady revolution or
ratting?
Is rotating resistance 12.7 N
(1.3 kgf, 2.9 Ib) or less in all
positions within 20% difference
between clockwise and coun-
terclockwise?
Is sliding resistance 340 N (35
kgf, 76 Ib) or less with 20% dif.
ference between left and right
direction?
Yes
Go to step
2.
Go to step
3 .
Go to step 4.
Go to step 5.
Go to step 6.
Go to step 7.
Inspect, readjust
and replace if nec.
essary.
Inspect and
replace if neces-
sary.
Inspect and
replace if neces-
sary.
Go to step 11.
Steering effort is
normal.
~~
No
4djustment back-
ash.
tdjustment.
Check, adjust and
replace if neces-
sary.
Check, adjust and
replace if neces-
sary.
Replace with new
one.
Replace with new
one.
Go to step 8.
Go to step 9.
Go to step
10.
Readjust back-
lash, and if ineffec
tive, replace bad
parts.
Readjust back-
lash, and if ineffec
tive, replace bad
Darts.
PS-78