1991 LEXUS SC400 Service Repair Manual

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Page 3017 of 4087

LEXUS SC400 1991 Service Repair Manual
POWER STEERING ECU
1. JACK UP VEHICLE AND SUPPORT IT ON STANDS
2. START ENGINE
3. MEASURE VOLTAGE OF ECU
(a) Using a voltmeter, measure the voltage between ECUterminals SOL and GND while the en

Page 3018 of 4087

$LEXUS SC400 1991 Service Repair Manual SERVICE SPECIFICATIONS SERVICE DATA SR0GP±01\ \ Steering wheel freeplay Maximum\ \ 30 mm (1.18 in.) \ $

SERVICE SPECIFICATIONS
SERVICE DATA
SR0GP±01\
\
Steering wheel freeplay Maximum\
\
30 mm (1.18 in.)
\
\
STEERING COLUMN\
\
\
\
Pawl stopper Mark\
\
\
\
1 or A\
\
12.68±12.74 mm (0.4992±0.5016 in.)
\
\
2 or B\
\
12.61±12.67 mm (0.4965±0.4988 in.)
\
\
3 or C\
\
12.54±12.60 mm (0.4937±0.4961 in.)
\
\
4 or D\
\
12.47±12.53 mm (0.4909±0.4933 in.)
\
\
5 or E\
\
12.40±12.46 mm (0.4882±0.4906 in.)
\
\
6 or F\
\
12.33±12.39 mm (0.4854±0.4878 in.)
\
\
7 or G\
\
12.26±12.32 mm (0.4827±0.4850 in.)
\
\
PS ON±VEHICLE INSPECTION\
\
\
\
Maximum rise of oil level\
\
Below 5 mm (0.20 in.)
\
\
Oil pressure at idle speed with valve closed Minimum\
\
7,355±7,845 kPa (75±80 kgf/cm2, 1,067±1,137 psi)
\
\
Steering effort at idle speed Maximum\
\
40 N (4.1 kgf, 9.0 lbf)
\
\
PS PUMP\
\
\
\
Rotor shaft bushing oil clearance (SC 400) STD\
\
0.01±0.03 mm (0.0004±0.0012 in.)
\
\
Rotor shaft bushing oil clearance (SC 400) Maximum\
\
0.07 mm (0.0028 in.)
\
\
Rotor shaft bushing oil clearance (SC 300) STD\
\
0.03±0.05 mm (0.0012±0.0020 in.)
\
\
Rotor shaft bushing oil clearance (SC 300) Maximum\
\
0.07 mm (0.0028 in.)
\
\
Vane plate to rotor groove clearance (SC 400)\
\
0.03 mm (0.0012 in.) or less
\
\
Vane plate to rotor groove clearance (SC 300)\
\
0.04 mm (0.0016 in.) or less
\
\
Vane plate length (SC 400) Minimum\
\
14.97 mm (0.5894 in.)
\
\
Vane plate height (SC 400) Minimum\
\
8.0 mm (0.315 in.)
\
\
Vane plate thickness (SC 400) Minimum\
\
1.77 mm (0.0697 in.)
\
\
Vane plate length (SC 300) Minimum\
\
14.97 mm (0.5894 in.)
\
\
Vane plate height (SC 300) Minimum\
\
8.5 mm (0.335 in.)
\
\
Vane plate thickness (SC 300) Minimum\
\
1.37 mm (0.0539 in.)
\
\
Vane plate length (SC 400) Rotor and cam ring mark\
\
\
\
NONE\
\
14.996±14.998 mm (0.59039±0.59047 in.)
\
\
1\
\
14.994±14.996 mm (0.59031±0.59039 in.)
\
\
2\
\
14.992±14.994 mm (0.59023±0.59031 in.)
\
\
3\
\
14.990±14.992 mm (0.59016±0.59024 in.)
\
\
4\
\
14.988±14.990 mm (0.59007±0.59016 in.)
\
\
Vane plate length (SC 300) Rotor and cam ring mark\
\
\
\
NONE\
\
14.999±15.001 mm (0.59051±0.59059 in.)
\
\
1\
\
14.997±14.999 mm (0.59043±0.59051 in.)
\
\
2\
\
14.995±14.997 mm (0.59035±0.59043 in.)
\
\
3\
\
14.993±14.995 mm (0.59027±0.59035 in.)
\
\
4\
\
14.991±14.993 mm (0.59020±0.59027 in.)
±
STEERING SERVICE SPECIFICATIONSSR±169
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Page 3019 of 4087

$LEXUS SC400 1991 Service Repair Manual \ \ Flow control valve spring length (SC 400) STD\ \ 37 mm (1.46 in.) \ \ Flow cont$

Page 3020 of 4087

$LEXUS SC400 1991 Service Repair Manual TORQUE SPECIFICATIONS SR0GQ±01\ \ Part tightened NVm kgf Vcm ft Vlbf\ \ STEERI$

TORQUE SPECIFICATIONS
SR0GQ±01\
\
Part tightened NVm kgf Vcm ft Vlbf\
\
STEERING COLUMN
\
\
Steering wheel 35 360 26\
\
Steering wheel pad 7.4 75 65 in. Vlbf\
\
Column bracket X Body 25 260 19\
\
Sliding yoke 35 360 26\
\
(Power tilt and power telescopic steering column)
\
\
Tilt steering housing support X Lower tube 13 130 9\
\
Support stopper bolt lock nut 2.9 30 26 in. Vlbf\
\
Connector bracket 4.9 50 43 in. Vlbf\
\
Telescopic sensor plate 4.9 50 43 in. Vlbf\
\
Telescopic adjusting screw 6.9 70 61 in. Vlbf\
\
Telescopic adjusting screw lock nut 31 320 23\
\
(Manual tilt and Manual telescopic steering column)
\
\
Tilt memory bolt 6.4 65 56 in. Vlbf\
\
Tilt memory bolt set nut 5.9 60 52 in. Vlbf\
\
Tilt lever assembly installation bolt 2.9 30 26 in. Vlbf\
\
Tilt pawl set nut 5.9 60 52 in. Vlbf\
\
Tilt lever retainer set nut 15 150 11\
\
Compression spring bushing bolt 7.8 80 69 in. Vlbf\
\
Steering column tube stopper bolt 19 195 14\
\
Serration attachment set nut 13 130 9\
\
Telescopic lever set bolt 25 260 19\
\
Connector bracket set bolt 4.9 50 43 in. Vlbf\
\
POWER STEERING PUMP
\
\
(SC 400)
\
\
PS pump installation bolt 39 400 29\
\
PS pump installation nut 43 440 32\
\
Pressure tube X Pressure port union 49 500 36\
\
Drive pulley X Rotor shaft 43 440 32\
\
Front housing X Rear bracket 39 400 29\
\
Pressure port union X Pump housing 69 700 51\
\
Suction port union X Pump housing 13 130 9\
\
(SC 300)
\
\
PS pump installation bolt 58 590 43\
\
Pressure tube X Pressure port union 49 500 36\
\
Drive pulley X Rotor shaft 43 440 32\
\
Front housing X Rear housing 17 170 12\
\
Pressure port union X Pump housing 83 850 61\
\
Reservoir tank X Pump housing Front side bolt 13 130 9\
\
Rear side bolts 17 170 12
±
STEERING SERVICE SPECIFICATIONSSR±171
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Page 3021 of 4087

$LEXUS SC400 1991 Service Repair Manual \ \ POWER STEERING GEAR HOUSING \ \ Tie rod end X Steering knuckle $

Page 3022 of 4087

LEXUS SC400 1991 Service Repair Manual
STEERING
SR±1
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Page 3023 of 4087

$LEXUS SC400 1991 Service Repair Manual GENERAL DESCRIPTION SR0E7±02 Care must be taken to replace parts properly because they could affect the p\ erformance of the steering system and result in a driving hazard. The steering wheel pad$

Page 3024 of 4087

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