ect LEXUS SC300 1991 Service Repair Manual

(b) Using SST, press the rack until the end stopper slightlytouches the press block.
SST 09612±24014 (09612±10061)
(c) Slightly tap the rack end with a brass bar and hammer.
(d) Pull out the rack with cylinder end stopper, 2 spacers and oil seal.
16. REMOVE RACK HOUSING OIL SEAL AND SPACER Using SST, tap out the oil seal and spacer.
SST 09631±12020, 09631±20031
GEAR HOUSING COMPONENTS
INSPECTION AND REPAIR
SR0NZ±01
1. INSPECT RACK
(a) Using a dial indicator, check the rack for runout and for teethwear or damage.
Maximum runout:
0.3 mm (0.012 in.)
(b) Check the back surface for wear or damage.If faulty, replace it.
2. IF NECESSARY, REPLACE RACK HOUSING BEARING AND OIL SEAL
(a) Using SST, remove the bearing. SST 09612±30012
NOTICE: Be careful not to damage the rack housing.
±
STEERING POWER STEERINGSR±153
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(b) Using SST, remove the oil seal.SST 09612±30012
NOTICE: Be careful not to damage the rack housing.
HINT: When using the SST, apply the tips of the SST to the
cutouts in the housing.
(c) Coat a new oil seal lip with power steering fluid.
(d) Using SST, install the new oil seal. SST 09620±30010 (09624±30010, 09631±00020)
NOTICE: Ensuse that the oil seal facing the correct direction.
(e) Using SST, press in a new bearing.
SST 09620±30010 (09626±30010, 09631±00020)
3. IF NECESSARY, REPLACE CONTROL VALVE HOUSING OIL SEAL AND BEARING
(a) Using SST, press out the oil seal with the bearing.
SST 09630±24013 (09620±24010), 09631±12020
(b) Coat the lip of a new oil seal with power steering fluid.
(c) Using SST, press in the new oil seal. SST 09630±24013 (09620±24020),
09631±12020
NOTICE: Ensure that the oil seal facing the correct direction.
SR±154±
STEERING POWER STEERING
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7. IF NECESSARY, REPLACE PRESSURE CONTROLVA LV E
(a) Using a hexagon wrench, remove the 3 bolts.
(b) Remove the 3 O±rings from the housing.
(c) Coat 3 new O±rings with power steering fluid, and install them on the control valve housing.
(d) Using a hexagon wrench, install a new pressure control valve
with the 3 bolts.
Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf)
STEERING GEAR HOUSING ASSEMBLY
SR0P0±01
1. COAT WITH POWER STEERING FLUID OR
MOLYBDENUM DISULPHIDE LITHIUM BASE GREASE
(See page SR±148)
2. INSTALL RACK HOUSING OIL SEAL AND SPACER
(a) Coat a new oil seal lip with power steering fluid.
(b) Insert SST into the oil seal and spacer. SST 09631±12020, 09631±32010
NOTICE:
w Make sure you install the oil seal facing the correct
direction.
w Take care that the oil seal does not get reversed as you
install it.
(c) Softly tap in the spacer and oil seal.
±
STEERING POWER STEERINGSR±157
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3. INSTALL STEERING RACK
(a) Install SST to the steering rack.HINT: If necessary, scrape the burrs off the steering rack
teeth end and burnish.
SST 09631±20102
(b) Coat SST with power steering fluid.
(c) Insert the rack into the cylinder.
(d) Remove SST.
4. INSTALL CYLINDER END STOPPER, OIL SEAL AND SPACERS
(a) To prevent oil seal lip damage, wind vinyl tape on the steering
rack end, and apply power steering fluid.
(b) Install the oil seal by pushing it into the cylinder, wit hout tilting.
NOTICE:
wMake sure you install the oil seal facing the correct
direction.
w Take care that the oil seal does not get reversed as you
install it.
(c) Install the 2 spacers.
(d) Using SST, drive in the cylinder end stopper.
SST 09620±30010 (09627±30010, 09631±00020)
SR±158
±
STEERING POWER STEERING
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ELECTRONIC CONTROL SYSTEM
PRECAUTION
SR0GR±01
Do not open the cover or the case of the ECU and various computers unless \
absolutely necessary.
(If the IC terminals are touched, the IC may be destroyed by static ele\
ctricity.)
ELECTRONIC CIRCUIT
SR0GS±04
±
STEERING POWER STEERINGSR±163
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TROUBLESHOOTING FLOW±CHART
SR0GT±04
Trouble

Hard steering at idle or low±speed driving.

Steering too sensitive during high±speed driving.
Preliminary Check

Check tire pressure.

Check lubrication of suspension and steering linkage.

Check front wheel alignment.

Check steering system joint and suspension arm ball joint.

Check for bent steering column.

Check that all connectors are secure.

Check PS pump fluid pressure. (See page SR±115)
SR±164±
STEERING POWER STEERING
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ELECTRONIC CONTROL COMPONENTS
INSPECTION
SOLENOID VALVE
SR0GU±01
1. DISCONNECT WIRING CONNECTOR
2. MEASURE RESISTANCEMeasure the resistance between SOL
and SOL .
Resistance:
6.0±11.0

3. CHECK SOLENOID OPERATION
(a) Connect the battery positive terminal to the solenoid terminal
SOL
.
(b) C onnect the battery negative terminal to the solenoid
terminal SOL .
(c) Check that the solenoid is clicked. If faulty, replace the pressure control valve with the solenoid
valve.
NOTICE:
w Do not apply voltage for more than 30 seconds to avoid
burning out the solenoid.
w If repeating this step, wait until the solenoid cools down
enough that it can be touched by hand.
4. CONNECT WIRING CONNECTOR
±
STEERING POWER STEERINGSR±167
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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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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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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 has an airbag built in, so take all due precautio\
ns when handling it. For more
details, see the RS section.
TROUBLESHOOTING
SR0E8±02
You will find the cause of trouble more easily by properly using the table \
shown below. In this table, the
numbers indicate the priority of the probable cause of trouble. Check each part in the order shown. If neces-
sary, repair or replace the part.
SA±3
SR±113SA±41
SR±167
SR±163
SA±16SA±3
SR±2±
STEERING GENERAL DESCRIPTION, TROUBLESHOOTING
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