Subaru Impreza 2003, Service Manual

Page: 2716 / 3610

PS-92
POWER ASSISTED SYSTEM (POWER STEERING)
GENERAL DIAGNOSTIC TABLE
2. MEASUREMENT OF STEERING EFFORT
Step Check Yes No
1 CHECK STEERING EFFORT.
1)Stop the vehicle on a concrete road.
2)Start the engine.
3)Idle the engine.
4)Install the spring scale on the steering wheel.
5)Pull the spring scale at an right angle to
steering wheel, and measure both right and left
steering wheel effort.
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 oil pump and is not a problem.
Is the steering effort less than
29.4 N (3.0 kgf, 6.6 lb)? Go to step 2. Adjust the back-
lash.
2 CHECK STEERING EFFORT.
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.
Is the steering effort less than
400 N (41 kgf, 90 lb)? Go to step 3. Perform adjust-
ment.
3 CHECK STEERING WHEEL EFFORT.
1)Remove the universal joint.
2)Measure the steering wheel effort.
Is the maximum steering effort
less than 2.26 N (0.23 kgf, 0.51
lb)? Go to step 4. Check, adjust and
replace if neces-
sary.
4 CHECK STEERING WHEEL EFFORT.
Measure the steering wheel effort.
Is the difference of steering
effort between clockwise and
counterclockwise less than
20%? Go to step 5. Check, adjust and
replace if neces-
sary.
5 CHECK UNIVERSAL JOINT.
Measure the folding torque of the joint (yoke of
steering column side). <Ref. to PS-25,
INSPECTION, Universal Joint.>
Is the folding torque less than
7.3 N (0.74 kgf, 1.64 lb)? Go to step 6. Replace with new
one.
6 CHECK UNIVERSAL JOINT.
Measure the folding torque of the joint (yoke of
gearbox side). <Ref. to PS-25, INSPECTION,
Universal Joint.>
Is the folding torque less than
3.8 N (0.39 kgf, 0.86 lb)? Go to step 7. Replace with new
one.
7 CHECK FRONT WHEEL.
Check the front wheel.
Are the front wheels for
unsteady revolution or rattling
and brake for dragging? Inspect, readjust
and replace if nec-
essary. Go to step 8.
8 CHECK TIE-ROD ENDS.
Remove the tie-rod ends.
Are the tie-rod ends of suspen-
sion for unsteady revolution or
rattling? Inspect and
replace if neces-
sary. Go to step 9.
9 CHECK BALL JOINT.
Remove the ball joint.
Are the ball joints of suspen-
sion for unsteady revolution or
rattling? Inspect and
replace if neces-
sary. Go to step 10.
10 CHECK GEARBOX.
Measure the rotating of gearbox.
<Ref. to PS-44, TURNING RESISTANCE OF
GEARBOX, INSPECTION, Steering Gearbox
[LHD MODEL].> or <Ref. to PS-62, TURNING
RESISTANCE OF GEARBOX, INSPECTION,
Steering Gearbox [RHD MODEL].>
Is the rotating resistance of
gear box less than 10.5 N (1.1
kgf, 2.4 lb)?
Is the difference between
clockwise and counterclock-
wise 20%? Go to step 11. Readjust the back-
lash, and if ineffec-
tive, replace the
faulty parts.
11 CHECK GEARBOX.
Measure the sliding of gearbox.
<Ref. to PS-43, SERVICE LIMIT, INSPEC-
TION, Steering Gearbox [LHD MODEL].> or
<Ref. to PS-61, SERVICE LIMIT, INSPEC-
TION, Steering Gearbox [RHD MODEL].>
Is the sliding resistance of gear
box less than 400 N (41 kgf, 90
lb)?
Is the difference between right
and left 20%? Steering effort is
normal. Readjust the back-
lash, and if ineffec-
tive, replace the
faulty parts.