steering LEXUS SC400 1991 Service Repair Manual

OKNG
3Check center airbag sensor assembly.
C
OK
Hint
P1. Connect connector to center airbag sensor assem-bly.
2. Using a service wire, connect D+ and D± on spiral cable side of connector between spiral cable and
steering wheel pad.
3. Using a service wire, connect P+ and P±n on center
airbag sensor assembly side of connector between
center airbag sensor assembly and front passen-
ger airbag.
4. Connect negative (±) terminal cable to battery, and wait at least 2 seconds.
1. Turn ignition switch AAC or ON, and wait at least 20 seconds.
Clear malfunction code. Turn ignition switch LOCK
and wait at least 20 seconds.
2. Turn ignition switch ACC or ON, and wait at least 20
seconds.
3. Using SST, connect terminals Tc and E
1 of DLC2.
SST 09843±18020
4. Check diagnostic trouble code.
Diagnostic trouble code 15 is not output.
Code other than code 15 may be output at this time, but
this is not relevant to this check.
Replace center airbag sensor assembly.
From the results of the above inspection, the malfunctioning part can now be\
considered normal. To
make sure of this, use the simulation method to check.
RS±100±
SUPPLEMENTAL RESTRAINT SYSTEM TROUBLESHOOTING
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OKNG
OKNG
INSPECTION PROCEDURE
HINT: If SRS warning light does not light up, perform the following troublesh\
ooting:
1Check ECU±B fuse.
Go to step

2Preparation.
P1. Disconnect battery negative (±) terminal cable, and
wait at least 90 seconds.
2. Remove steering wheel pad (See page RS±19).
3. Disconnect connectors of front passenger airbag assembly (See page RS±32).
Caution: Store the steering wheel pad with the
surface facing upward.
3Check connection of center airbag sensor assembly connector.
Repair.
±
SUPPLEMENTAL RESTRAINT SYSTEM TROUBLESHOOTINGRS±105
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TORQUE SPECIFICATIONS
SA0WG±03
(FRONT)
\
 \
Part tightened NVm kgf Vcm ft Vlbf
\
 \
Hub nut 103 1,050 76
\
 \
Front and rear adjusting cam bolt 226 2,300 166
\
 \
Axle hub lock nut 199 2,030 147
\
 \
Lower ball joint X Steering knuckle 125 1,270 92
\
 \
Tie rod end X Steering knuckle 49 500 36
\
 \
Steering knuckle X Upper suspension arm 103 1,050 76
\
 \
Lower ball foint X Lower suspension arm 127 1,300 94
\
 \
Disc brake caliper X Steering knuckle 11 8 1,200 87
\
 \
Speed sensor set bolt 103 80 76 in. Vlbf
\
 \
Front shock absorber X Body 35 360 26
\
 \
Front shock absorber X Lower suspension arm 143 1,460 106
\
 \
Upper suspension arm mounting nut 164 1,670 121
\
 \
Piston rod lock nut 29 300 22
\
 \
Stabilizer link X Lower suspension arm 74 750 54
\
 \
Stabilizer link X Stabilizer bar 74 750 54
\
 \
Stabilizer bar bracket X Body 18 180 13
\
 \
Steering knuckle X Disc brake dust cover 19 195 14
(REAR)
\
 \
Part tightened N Vm kgf Vcm ft Vlbf
\
 \
Shock absorber X Lower suspension arm 143 1,460 106\
 \
Upper arm X Body 164 1,670 271\
 \
Rear axle carrier X Brake caliper 104 1,065 77\
 \
No. 1 lower arm X Rear axle carrier 59 600 43\
 \
No. 1 lower arm X Body 184 1,880 136
\
 \
No. 2 lower arm X Rear axle carrier 150 1,525 11 0
\
 \
No. 2 lower arm X Body 184 1,880 136
\
 \
Strut rod X Rear axle carrier 184 1,880 136
\
 \
Strut rod X Body 184 1,880 136
\
 \
Rear drive shaft X Axle hub 289 2,950 213
\
 \
Upper ball joint X Rear axle carrier 109 1,110 80
\
Parking brake backing plate X Rear axle carrier2626019\
 \
Rear drive shaft X Differential 83 850 64\
 
\

\
Differential mounting bolt \
Front
Rear 

147
142 

1,500
1,450 

108
105
\
 \
Differential carrier cover set bolt 47 475 34
\
 \
Suspension support X Body 27 280 20
\
 \
Suspension support X Shock absorber rod 27 280 20
\
 \
Stabilizer bar link nut 74 750 54
\
 \
Stabilizer bar bushing retainer bolt 28 290 21
±
SUSPENSION AND AXLE SERVICE SPECIFICATIONSSA±129
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4. CHECK WHEEL BEARING LOOSENESS
(a) Check the backlash in bearing shaft direction.
Maximum: 0.05 mm (0.0020 in.)
(b) Check the axle hub deviation.
Maximum: 0.05 mm (0.0020 in.)
5. CHECK FRONT SUSPENSION FOR LOOSENESS
6. CHECK STEERING LINKAGE FOR LOOSENESS
7. CHECK BALL JOINT FOR EXCESSIVE LOOSENESS
8. CHECK SHOCK ABSORBER WORK PROPERLYwCheck for oil leak
w Check mounting busings for wear
w Bounce front and rear of the vehicle
SA±4
±
SUSPENSION AND AXLE GENERAL INSPECTION
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WHEEL ALIGNMENT
FRONT WHEEL ALIGNMENT
SA19Z±01
1. MEASURE VEHICLE HEIGHTFront vehicle height (SC400):
 Tire size Front P225/55R16194.4 mm (7.654 in.)
Front vehicle height (SC300):
 Tire size Front P215/60R15190.4 mm (7.496 in.)
Measuring point:
Measure from the ground to the center of the lower suspen-
sion arm front mounting bolt.
NOTICE: Before inspecting the wheel alignment, adjust
the vehicle height to specification.
If the vehicle height is not standard, try to adjust it by pushing
down on or lifting the body.
2. INSTALL CAMBER±CASTER±KINGPIN GAUGE OR ONTO WHEEL ALIGNMENT TESTER
Follow the specific instructions of the equipment manufactur-
er.
3. INSPECT CAMBER, CASTER AND STEERING AXIS INCLINATION
Specifications:
 

Camber
Left±right error 

0
01 ' + 45 '
30 ' or less
 

Caster
Left±right error256 ' + 45 '
30 ' or less
 


Steering axis inclination
Left±right error 


8
58 ' + 45 '
30 ' or less
If the steering axis inclination is not as specified, after camber
and caster have correctly adjusted, recheck the steering
knuckle front wheel for bearing or looseness.
4. INSPECT TOE±IN
Toe±in (total): A + B 0.1  + 0.2 
C±D 1 + 2 mm (0.04 + 0.08 in.)
If toe±in is not within specification adjust by the tie rod end.
±
SUSPENSION AND AXLE WHEEL ALIGNMENTSA±5
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STEERING KNUCKLE WITH AXLE HUB
REMOVAL
SA01Y±08
1. JACK UP VEHICLE AND REMOVE FRONT WHEEL
2. REMOVE FRONT BRAKE CALIPER AND BRAKE DISC
(a) Remove the 2 bolts and remove the brake caliper from thesteering knuckle.
(b) Hang up the brake caliper using wire, etc.
(c) Place matchmarks on the brake disc and axle hub.
(d) Remove the 2 screws and remove the brake disc.
3. REMOVE ABS SPEED SENSOR FROM STEERING KNUCKLE
Remove the bolt and disconnect the sensor from the steering
knuckle.
4. CHECK BACKLASH IN BEARING SHAFT DIRECTION Place the dial indicator near the center of the axle hub and
check the backlash in the bearing shaft direction.
Maximum:
0.05 mm (0.0020 in.)
If greater than the specified maximum, replace the bearing.
±
SUSPENSION AND AXLE FRONT AXLE HUBSA±17
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5. CHECK AXLE HUB DEVIATIONUsing a dial indicator, check the deviation at the surface of
the axle hub outside the hub bolt.
Maximum:
0.05 mm (0.0020 in.)
If greater than the specified maximum, replace the axle hub.
6. DISCONNECT TIE ROD END FROM STEERING KNUCKLE
(a) Remove the cotter pin and nut.
(b) Using SST, disconnect the tie rod end from the steering
knuckle.
SST 09628±10011
7. DISCONNECT STEERING KNUCKLE FROM U PPER
SUSPENSION ARM
(a) Remove the cotter pin and nut.
(b) Using SST, disconnect the steering knuckle from the upper
suspension arm.
SST 09628±62011
8. REMOVE STEERING KNUCKLE
(a) Remove the clip and nut.
(b) Using SST, remove the steering knuckle from the lower suspension arm.
SST 09628±62011
SA±18
±
SUSPENSION AND AXLE FRONT AXLE HUB
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FRONT AXLE HUB DISASSEMBLY
SA0RL±04
1. REMOVE HUB BEARING CAPUsing a screwdriver, remove the hub bearing cap from the
steering knuckle.
2. REMOVE FRONT AXLE HUB LOCK NUT AND ABS SPEED SENSOR ROTOR
(a) Clamp the axle hub in a soft jaw vise.
HINT: Close vise until it holds hub bolt do not tighten further.
(b) Using a hammer and chisel, loosen the staked part of the lock
nut and remove it.
(c) Remove the sensor rotor.
NOTICE: Take care not to scratch the serrations of the sensor
rotor.
3. REMOVE AXLE SHAFT FROM STEERING KNUCKLE
(a) Remove the 4 bolts and shift the brake dust cover toward the hub side (outside).
(b) Using SST, remove the axle shaft from the steering knuckle. SST 09950±20017
±
SUSPENSION AND AXLE FRONT AXLE HUBSA±19
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4. REMOVE INNER RACE (OUTSIDE) FROM AXLE SHAFTUsing SST, remove the inner race from the axle shaft.
SST 09950±20017
5. REMOVE OIL SEAL Using SST, remove the oil seal from the steering knuckle.
SST 09308±00010
6. REMOVE BEARING FROM STEERING KNUCKLE
(a) Using snap ring pliers, remove the snap ring.
(b) Position the inner race above the bearing on the inner side.
(c) Using SST and a press, remove the bearing from the steering
knuckle.
SST 09608±35014 (09608±06100)
SA±20
±
SUSPENSION AND AXLE FRONT AXLE HUB
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FRONT AXLE HUB ASSEMBLY
SA0W3±03
1. INSTALL BEARING
(a) Using SST, install a new bearing to steering knuckle.SST 09608±35014 (09608±06200)
NOTICE: If the inner race and balls come loose from the
bearing outer race, be sure to install them on the same
side as before.
(b) Using snap ring pliers, install the snap ring.
2. INSTALL OIL SEAL
(a) Install the inner race (outside).
(b) Using SST and a hammer, tap in a new oil seal until it is flush
with end surface of the steering knuckle.
SST 09608±32010
(c) Coat MP grease to the oil seal lip.
3. INSTALL AXLE HUB TO STEERING KNUCKLE
(a) Install the brake dust cover to the steering knuckle with the 4 bolts.
Torque: 8.3 N Vm (85 kgf Vcm, 74 in. Vlbf)
±
SUSPENSION AND AXLE FRONT AXLE HUBSA±21
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