key LEXUS SC400 1991 Service Workshop Manual

3. INSPECT TIMING BELT TENSIONER(a) Visually check tensioner for oil leakage.
HINT: If there is only the faintest trace of oil on the seal on the
push rod side, the tensioner is all right.
If leakage is found, replace the tensioner.
(b) Hold the tensioner in both hands and push the push rodstrongly against the floor or wall to check that it doesn't
move.
If the push rod moves, replace the tensioner.
(c) Measure the protrusion of the push rod from the housing
end.
Protrusion: 10.5±11.5 mm (0.413±0.453 in.)
If the protrusion is not as specified, replace the tensioner.
INSTALLATION OF TIMING BELT
(See Components pages EM±33 and 34)
1. INSTALL CRANKSHAFT TIMING PULLEY (a) Align the pulley set key on the crankshaft with the keygroove of the timing pulley.
(b) Using SST and a hammer, tap in the timing pulley, facing
the flange side rearward.
SST 09223±46011
2. INSTALL NO. 1 IDLER PULLEY (a) Apply adhesive to two or three threads of the pulley boltend.
Adhesive: Part No. 08833±00080, THREE BOND 1344, LOCTITE
242 OR equivalent
(b) Using a 10 mm hexagon wrench, install the plate washer
and idler pulley with the pulley bolt. Torque the pulley
bolt.
Torque: 34 N Vm (350 kgf Vcm, 25 ft Vlbf)
(c) Check that the pulley bracket moves smoothly.
EM±46
±
ENGINE MECHANICAL Timing Belt
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7. INSTALL NO.1 TIMING BELT COVER(a) Install the gasket to the timing belt cover.
(b) Install the timing belt cover with the four bolts.
8. INSTALL HYDRAULIC PUMP (a) Install the hydraulic pump and solenoid valve connectorclamp and engine speed sensor wire clamp with the two
bolts and two nuts.
Torque:
12 mm heads 16 N Vm (160 kgf Vcm, 12 ft Vlbf)
Others 30 N Vm (310 kgf Vcm, 22 ft Vlbf)
HINT: Each bolt length is indicated in the illustration.
Bolt length:
A 106 mm (4.17 in.) for 12 mm head
B 114 mm (4.49 in.) for 14 mm head
(b) Connect the solenoid valve connector.
9. INSTALL CRANKSHAFT PULLEY (a) Align the pulley set key on the crankshaft with the keygroove of the pulley.
(b) Using SST and a hammer, tap in the pulley.
SST 09223±46011
(c) Using SST, install and torque the pulley bolt.
SST 09213±70010 and 09330±00021
Torque: 245 N Vm (2,500 kgf Vcm, 181 ft Vlbf)
10. INSTALL RH CAMSHAFT TIMING PULLEY
(a) Align the knock pin on the camshaft with the knock pingroove of the timing pulley.
(b) Slide the timing pulley, facing the ºRº mark forward.
(c) Using SST, install and torque the pulley bolt.
SST 09278±54012
Torque: 108 N Vm (1,100 kgf Vcm, 80 ft Vlbf)
EM±48±
ENGINE MECHANICAL Timing Belt
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SR±52).
IN±33 ).
Unlock Warning Switch Circuit
CIRCUIT DESCRIPTION
Whether or not the key is inserted in the key cylinder is detected and a signal\
is sent to the ECU.
(The switch is ON (closed) when the ignition key is inserted.)
 Ignition key Unlock Warning Switch UWSW Voltage
 

Out 

Opened 

10±14 V
 In Closed Below 1 V
DIAGNOSTIC CHARTDIAGNOSTIC CHART
SR±100±
STEERING STEERING COLUMN
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NGOK
OKNG
OKNG
INSPECTION PROCEDURE
1Check voltage between terminal UWSW of ECU connector and body ground
C
OK
PRemove ECU with connectors still connected.
Measure voltage between terminal UWSW of ECU con-
nector and body ground with the ignition key inserted,
or removed.
Proceed to next circuit inspection shown on matrix chart
(See page SR±52).
2Check unlock warning switch.
C
OK
PDisconnect unlock warning switch connector.
Measure resistance between terminals 9 and 10 of un-
lock warning switch connector with the ignition key in-
serted or removed.
Replace unlock warning switch.
3Check harness and connector between ECU and unlock warning switch (See \
page IN±33).
Repair or replace harness or connector.
Check and replace ECU.
±
STEERING STEERING COLUMNSR±101
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STEERING COLUMN DISASSEMBLY
SR0ER±03
NOTICE: When placing the breakaway bracket in a vise
during disassembly or assembly of the steering column,
use aluminum, etc. to prevent scratches to the tip of the
capsule.
1. REMOVE IGNITION KEY CYLINDER ILLUMINATION
2. REMOVE SLIDING YOKE Place matchmarks on the sliding yoke and main shaft.
3. REMOVE LOWER DUST COVER
(a) Remove the clip and dust cover.
(b) Using a screwdriver, remove the dust seal.
4. REMOVE COLUMN UPPER BRACKET
(a) U s i n g a c e n t e r i n g p u n c h , m a r k t h e c e n t e r o f t h e 2 tapered±head bolts.
(b) U s i n g a 4 ± 5 m m ( 0 . 16±0.20 in.) drill, drill into the 2
tapered±head bolts.
(c) Using a screw extractor, remove the 2 tapered±head bolts.
(d) Remove the bracket and column upper clamp.
SR±14
±
STEERING STEERING COLUMN
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(b) Remove the main shaft from the column tube.
(c) Remove the spring, thrust collar and bearing.
STEERING COLUMN INSPECTION AND
REPLACEMENT
SR0ES±03
1. INSPECT KEY CYLINDERCheck that the steering lock mechanism operates properly.
2. IF NECESSARY, REPLACE KEY CYLINDER
(a) Place the ignition key at the ACC position.
(b) Push down the stop pin with a thin rod, and pull out the key cylinder.
(c) Install a new key cylinder. HINT: Make sure the ignition key is at the ACC position.
3. INSPECT UPPER BEARING Check the upper bearing rotation condition and check for ab-
normal noise.
If the bearing is worn or damaged, replace the column upper
tube.
STEERING COLUMN ASSEMBLY
SR0ET±04
1. APPLY MOLYBDENUM DISULPHIDE LITHIUM BASEGREASE (See page SR±12)
2. INSTALL MAIN SHAFT
(a) Install the bearing, thrust collar and spring to the main shaft.
(b) Install the main shaft into the upper column tube.
±
STEERING STEERING COLUMNSR±19
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(b) Install the lower dust cover and clip.
24. INSTALL SLIDING YOKEAlign matchmarks and install the sliding yoke to the main
shaft.
Torque: 35 N Vm (360 kgf Vcm, 26 ft Vlbf)
25. INSTALL IGNITION KEY CYLINDER ILLUMINATION
26. CHECK TILT OPERATION
(a) Check that there is not axial play at the end of the main shaft.
(b) With the main shaft in the neutral position, push the tilt lever and check that the main shaft rises to the uppermost position.
(c) Lower the main shaft, and check that it locks in the uppermost position.
27. CHECK TELESCOPIC OPERATION
(a) Check that t here is no axial play when the lever is turned fully
counterclockwise.
(b) Check that the main shaft moves smoothly when the lever is turned clockwise.
SR±26
±
STEERING STEERING COLUMN
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STEERING COLUMN DISASSEMBLY
SR0EL±04
NOTICE: When placing the breakaway bracket in a vise during
disassembly or assembly of the steering column, use alumi-
num, etc. to prevent scratches to the tip of the capsule.
1. REMOVE IGNITION KEY CYLINDER ILLUMINATION
2. REMOVE SLIDING YOKE Place matchmarks on the sliding yoke and main shaft.
3. REMOVE LOWER DUST COVER
(a) Remove the clip and dust cover.
(b) Using a screwdriver, remove the dust seal.
4. REMOVE TELESCOPIC POSITION SENSOR PLATE
5. REMOVE TILT AND TELESCOPIC POSITION SENSORS
±
STEERING STEERING COLUMNSR±29
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(c) Remove the upper tube and main shaft from the lower tube.
12. REMOVE TILT STEERING HOUSING SUPPORT
13. REMOVE MAIN SHAFT ASSEMBLY
(a) Secure the column upper tube in a vise.
NOTICE: Do not tighten the vise too tight.
(b) Using SST, compress the compression spring.SST 09950±20017 (09956±00010)
(c) Using snap ring pliers, remove the snap ring.
(b) Remove the main shaft from the upper tube.
(c) Remove the spring, thrust collar and bearing.
STEERING COLUMN INSPECTION AND
REPLACEMENT
SR0EM±03
1. INSPECT KEY CYLINDER Check that the steering lock mechanism operates properly.
SR±32
±
STEERING STEERING COLUMN
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2. IF NECESSARY, REPLACE KEY CYLINDER
(a) Place the ignition key at the ACC position.
(b) Push down the stop pin with a thin rod, and pull out the keycylinder.
(d) Install a new key cylinder. HINT: Make sure the ignition key is at the ACC position.
3. INSPECT UPPER BEARING Check the upper bearing rotation condition and check for ab-
normal noise.
If the bearing is worn or damaged, replace the column upper
tube.
4. IF NECESSARY, ADJUST TELESCOPIC ADJUSTING SCREWS
(a) Using SST, remove the lock nuts.
SST 09617±14010
(b) Using SST, tighten the adjusting screws. SST 09923±00010
Torque: 6.9 N Vm (70 kgf Vcm, 64 in. Vlbf)
NOTICE:
w If the adjusting screw is tightened higher than the
specified torque, the telescopic mechanism may
malfunction. Conversely, if the torque applied is too low,
rattling may develop in the column, so the specified
torque should always be applied.
w When the adjusting screw and conical springs have been
removed, replace the conical springs facing in the
direction shown in the illustration.
±
STEERING STEERING COLUMNSR±33
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