2006 SUBARU IMPREZA WRX and WRX STI Service and Repair Manual

POWER ASSISTED SYSTEM (POWER STEERING)

PS-2 POWER ASSISTED SYSTEM (POWER STEERING) General Description 1. General Description A: SPECIFICATION Model NON-TURBO TURBO 2.5i, OUTBACK WRX STI Whole system Minimum turning radius m (ft) 5.4 (17.7) 5.7 (18.7) Steering angle (Inside-Outside) 34.5° — 30.3° 32.9° — 28.5° Steering wheel diameter mm (in) 375 (14.76) 375 (14.76) Lock-to-lock speed (Turns lock to lock, Gear box) 3.0 2.7 2.6 Gearbox Type Rack and pinion, Integral Backlash 0 (Automatically adjustable) Valve (Power steering system) Rotary valve Pump (Power steering system) Type Vane pump Oil tank Installed on body Output cm 3 (cu in)/rev. 7.2 (0.439) 7.2 (0.439) Relief pressure kPa (kgf/cm 2 , psi) 6,700 — 7,400 (68 — 75, 972 — 1,073) 7,350 — 8,036 (75 — 82, 1,067 — 1,165) Hydraulic fluid control Dropping in response to increased engine revolutions Hydraulic fluid 2 (US qt, Imp qt) 1,000 rpm: 7 (7.4, 6.2) 3,000 rpm: 5 (5.3, 4.4) 7.5 (7.9, 6.6) Range of revolution rpm 700 — 9,000 Revolving direction Clockwise Working fluid (Power steering system) Name ATF DEXRON III Capacity Oil tank 0.3 (0.3, 0.3) 2 (US qt, Imp qt) Total 0.7 (0.7, 0.6)

PS-3 POWER ASSISTED SYSTEM (POWER STEERING) General Description Steering wheel Free play mm (in) 17 (0.67) Turning angle Inner wheel 2.5i, OUTBACK, WRX 34.5°±1.5° STI 32.9°±1.5° Outer wheel 2.5i, OUTBACK, WRX 30.3°±1.5° STI 28.5°±1.5° Steering shaft Clearance between steering wheel and column cover mm (in) 4.0 (0.16) Steering gearbox (Power steering system) Sliding resistance N (kgf, lbf) 400 (41, 90) or less Rack shaft play in radial direction Right-turn steering mm (in) 0.19 (0.0075) or less Left-turn steering mm (in) Horizontal movement: 0.15 (0.0059) or less Vertical movement: 0.3 (0.012) or less Input shaft play In radial direction mm (in) 0.18 (0.0071) or less In axial direction mm (in) 0.5 (0.020) or less Turning resistance N (kgf, lbf) Maximum allowable value: Less than 10.5 (1.1, 2.4) Difference between right and left sliding resistance: Less than 20% Oil pump (Power steering system) Pulley shaft Radial play mm (in) 0.4 (0.016) or less Axial play mm (in) 0.9 (0.035) or less Pulley Ditch deflection mm (in) 1.0 (0.039) or less Resistance to rotation 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 steering system) At standstill with engine idling on a concrete road N (kgf, lbf) 31.4 (3.2, 7.1) or less At standstill with engine stalled on a concrete road N (kgf, lbf) 294.2 (30, 66.2) or less Recommended power steering fluid Manufacturer ATF DEXRON III B.P. CALTEX CASTROL MOBIL SHELL TEXACO

PS-4 POWER ASSISTED SYSTEM (POWER STEERING) General Description 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: 25 (2.5, 18.1) (4) Column cover T3: 45 (4.6, 33.2) PS-00618 (2) (4) T2 T1 (3) (1) T3 (6) (5) (7)

PS-5 POWER ASSISTED SYSTEM (POWER STEERING) General Description 2. POWER ASSISTED SYSTEM • NON-TURBO MODEL PS-00645 T1 T11 T13 T10 T5 T15 T4 T14 T4 T14 T15 T10 T13 (18) (19) (19) (19) T5 T9 T9 T8 T8 T1 T4 T2 T2 T3 T6 T7 T9 T9 T2 T12 (10) (9) (4) (4) (4) (1) (6) (58) (57) (8) (12) (15) (13) (14) (16) (5) (2) (3) T4 (11) (38) (36) (39) (40) (41) (42) (43) (44) (45) (46) (47) (56) (55) (54) (49) (53) (52) (46) (45) (44) (37) (43) (42) (41) (40) (23) (24) (25) (26) (27) (38) (39) (21) (22) (20) (17) (19) (36) (28) (29) (31) (47) (30) (50) (35) (34) (33) (32) (37) (51) (48) (7) (7) T12

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2006 SUBARU IMPREZA WRX and WRX STI Service and Repair Manual

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