Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 478
RS-19
General Diagnostic Table
REAR SUSPENSION
10.General Diagnostic Table
A: INSPECTION
1. IMPROPER VEHICLE POSTURE OR IMPROPER WHEEL ARCH HEIGHT
2. POOR RIDE COMFORT
1) Large rebound shock
2) Rocking of the vehicle continues too long after running over bump and hump.
3) Excessive shock in bumping
3. NOISE
Possible cause
Corrective action
(1) Permanent distortion or damaged coil spring
Replace.
(2) Rough operation of strut or shock absorber
Replace.
(3) Improper installation of strut or shock absorber
Replace with proper parts.
(4) Installation of the wrong coil spring
Replace with proper parts.
Possible cause
Corrective action
(1) Damaged coil spring
Replace.
(2) Overinflation of tires
Adjust.
(3) Improper wheel arch height
Replace the coil springs with new parts.
(4) Fault in operation of strut or shock absorber
Replace.
(5) Damage or deformation of strut mount or shock absorber mount
Replace.
(6) Unsuitable length (maximum or minimum) of strut or shock absorber
Replace with appropriate parts.
(7) Deformation or loss of bushing
Replace.
(8) Deformation or damage of helper in strut assembly or shock absorber
Replace.
(9) Oil leakage from the strut or shock absorber
Replace.
Possible cause
Corrective action
(1) Wear or damage of strut or shock absorber component parts
Replace.
(2) Loosening of the suspension link installing bolt
Tighten to the specified torque.
(3) Deformation or loss of bushing
Replace.
(4) Unsuitable length (maximum or minimum) of strut or shock absorber
Replace with appropriate parts.
(5) Damaged coil spring
Replace.
(6) Wear or damage of the ball joint
Replace.
(7) Deformation of the stabilizer clamp
Replace.
RS-20
General Diagnostic Table
REAR SUSPENSION
WHEEL AND TIRE SYSTEM
WT
Page
General Description . . . . . . . . . . . . . . . . . . . . ...2
Tire and Wheel . . . . . . . . . . . . . . . . . . . . . . ...4
“T-type” Tire . . . . . . . . . . . . . . . . . . . . . . . ...7
Tire Pressure Monitoring System . . . . . . . . . . . . . . . ...8
General Diagnostic Table . . . . . . . . . . . . . . . . . . .10
WT-2
General Description
WHEEL AND TIRE SYSTEM
1. General Description
A: SPECIFICATION
*1
: Size and inflation pressure of the standard equipment tire, spare tire for emergency and appropriate tire for equipment are de-
scribed on the “Tire inflation pressure” label attached to the body side of the driver’s door.
NOTE:
“T-type” tire for temporary use is equipped as a spare tire.
1. SERVICE DATA
(1) Inset
(2) P.C.D.
WT-00001
Model
Tire size
Wheel size
Inset
mm (in)
P.C.D.
mm (in)
Tire inflation pressure kPa
(kgf/cm
2
, psi)
Front wheel
Rear wheel
STI model
Standard type
245/40R18 93W
18 × 8
1
/
2
J
55 (2.17)
114.3 (4.50)
*1
“T-type” Tire
T135/70D17 102M
17 × 4T
30 (1.18)
Except for STI
model
Standard type
235/45R17 94W
17 × 8J
53 (2.09)
100 (3.94)
“T-type” Tire
T135/70D17 102M
17 × 4T
30 (1.18)
Part
Axial runout
Radial runout
Steel wheel
1.5 mm (0.059 in)
Aluminum wheel
1.0 mm (0.039 in)
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