Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 570
POWER ASSISTED SYSTEM
(POWER STEERING)
PS
Page
General Description . . . . . . . . . . . . . . . . . . . . ...2
Steering Wheel . . . . . . . . . . . . . . . . . . . . . . .13
Universal Joint . . . . . . . . . . . . . . . . . . . . . . ..14
Steering Column . . . . . . . . . . . . . . . . . . . . . ..16
Steering Gearbox . . . . . . . . . . . . . . . . . . . . . .18
Pipe Assembly . . . . . . . . . . . . . . . . . . . . . . .39
Oil Pump . . . . . . . . . . . . . . . . . . . . . . . . ..45
Reservoir Tank . . . . . . . . . . . . . . . . . . . . . . .50
Power Steering Fluid . . . . . . . . . . . . . . . . . . . . 51
General Diagnostic Table . . . . . . . . . . . . . . . . . . .52
PS-2
General Description
POWER ASSISTED SYSTEM (POWER STEERING)
1. General Description
A: SPECIFICATION
Model
STI model
Except for STI model
Whole system
Minimum turning radius
m (ft)
5.5 (18)
Steering angle
Inner wheel
36.6°±1.5°
Outer wheel
32.2°±1.5°
Steering wheel diameter
mm (in)
375 (14.76)
Lock-to-lock revolution number
2.8
Gearbox
Type
Rack and Pinion, Integral
Backlash
0 (automatic adjusting)
Valve (power steering system)
Rotary valve
Pump
(Power steering
system)
Type
Vane pump
Oil tank
Installed on body
Specific output
cm
3
(cu in)/rev.
8.5 (0.519)
Relief pressure
kPa (kgf/cm
2
, psi)
8,300 — 9,000
(85 — 92, 1,203 — 1,305)
8,100 — 8,800
(83 — 90, 1,174 — 1,276)
Hydraulic fluid control
Engine speed sensitive
Hydraulic fluid
L (US qt, Imp qt)
1,000 rpm: 7.5 (7.9, 6.6)
3,000 rpm: 7.3 (7.7, 6.4)
1,000 rpm: 6.3 (6.7, 5.5)
3,000 rpm: 5.9 (6.2, 5.2)
RPM range
rpm
680 — 9,600
Direction of rotation
Clockwise
Hydraulic oil
(Power steering
system)
Capacity
L (US qt, Imp qt)
Oil tank
0.2 (0.2, 0.2)
Whole system
0.7 (0.7, 0.6)
PS-3
General Description
POWER ASSISTED SYSTEM (POWER STEERING)
Steering wheel Free play
mm (in)
17 (0.67)
Steering shaft
Clearance between the steering wheel
and column cover
mm (in)
2 — 4 (0.08 — 0.16)
Steering gear-
box
(Power steer-
ing system)
Sliding resistance
N (kgf, lbf)
343 (35, 77) or less
Difference between right and left sliding resis-
tance: 20% or less
Rack shaft play in the
radial direction
Right-turn
steering
mm (in)
0.12 (0.005) or less
Left-turn
steering
mm (in)
Horizontal direction: 0.15 (0.006) or less
Vertical direction: 0.3 (0.012) or less
Input shaft play
In radial
direction
mm (in)
0.26 (0.01) or less
In axial direc-
tion
mm (in)
Without play
Rotational resistance
N (kgf, lbf)
Maximum allowable value: 13.7 (1.40, 3.08) or
less
Difference between right and left sliding resis-
tance: 24%
Oil pump
(Power steer-
ing system)
Pulley shaft
Radial play
mm (in)
0.2 (0.008) or less
Axial play
mm (in)
0.9 (0.035) or less
Pulley
Ditch deflec-
tion
mm (in)
1.0 (0.039) or less
Rotational
resistance
N (kgf, lbf)
9.22 (0.94, 2.07) or less
Regular pressure (unloaded)
kPa (kgf/cm
2
, psi)
981 (10, 142) or less
Steering wheel
effort
(Power steer-
ing system)
At standstill with engine idling on paved
road
N (kgf, lbf)
34 (3.5, 7.6) or less
At standstill with engine stalled on paved
road
N (kgf, lbf)
294.2 (30, 66.1) or less
Recommended power steering fluid
SUBARU ATF or DEXRON III
PS-4
General Description
POWER ASSISTED SYSTEM (POWER STEERING)
B: COMPONENT
1. STEERING WHEEL AND COLUMN
(1)
Bushing
(5)
Steering wheel
Tightening torque: N·m (kgf-m, ft-lb)
(2)
Steering shaft
(6)
Airbag module
T1: 1.2 (0.12, 0.9)
(3)
Steering roll connector
(7)
Steering wheel lower cover
T2: 20 (2.0, 14.8)
(4)
Column cover
T3: 39 (4.0, 28.8)
PS-00841
T2
T1
T3
(6)
(5)
(1)
(2)
(3)
(4)
(7)
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