maintenance LEXUS SC400 1991 Service Repair Manual

MAINTENANCE OF TAPE PLAYER
Head Cleaning
Using a moist±type cleaning tape, clean the head surface, pinch rolle\
rs and capstans.
COMPACT DISC PLAYER
Compact Disc (hereafter called ºCDº) players use a laser beam pick±up\
to read the digital signals recorded
on the CD and reproduce analog signals of the music, etc. There are 4.7 in\
. (12 cm) and 3.2 in. (8 cm) CD
available, but it is recommended that you do not use 3.2 in. (8 cm) discs in the\
CD auto changer.
HINT: Never attempt to disassemble or oil any part of the player unit. Do not\
insert any object other than
a disc into the magagine.
NOTICE: CD players use on invisible laser laser beam which could cause hazardou\
s radiation expo-
sure. Be sure to operate the player correctly as instructed.
±
BODY ELECTRICAL SYSTEM Audio SystemBE±197
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PRECAUTIONS
1. Before working on the fuel system, disconnect the cablefrom negative (±) terminal of the battery.
HINT: Any diagnostic code retained by the computer will be
erased when the battery terminal is removed. Therefore, if
necessary, read the diagnosis before removing the battery
terminal.
CAUTION: Turn the ignition switch to ºLOCKº. Discon-
nect the cable from the negative (±) terminal of the bat-
tery. Wait at least 20 seconds before proceeding with
work.
2. Do not smoke or work on open flame when working on the fuel system.
3. Keep gasoline away from rubber or leather parts.
INSPECTION PRECAUTIONS
MAINTENANCE PRECAUTIONS
1. CHECK CORRECT ENGINE TUNE±UP (See page EM±8)
2. PRECAUTIONS WHEN CONNECTING GAUGE (a) Use the battery as the power source for the timing light,tachometer, etc.
(b) Connect the test probe of a tachometer to the terminal IG
of the check connector.
3. IN EVENT OF ENGINE MISFIRE, FOLLOWING PRECAUTIONS SHOULD BE TAKEN
(a) Check proper connection of battery terminals, etc.
(b) Handle high±tension cords carefully.
(c) After repair work, check that the ignition coil terminalsand all other ignition system lines are reconnected
securely.
(d) When cleaning the engine compartment, be especially careful to protect the electrical system from water.
4. PRECAUTIONS WHEN HANDLING OXYGEN SENSOR (a) Do not allow oxygen sensor to drop or hit against anobject.
(b) Do not allow the sensor to come into contact with water.
±
EFI SYSTEM Precautions, Inspection PrecautionsFI±11
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4. Install the injector to delivery pipe and cylinder head asshown in the illustration.
5. Check that there are no fuel leaks after performing any maintenance on the fuel system.
(a) Using SST, connect terminals +B and FP of the check(ºDIAGNOSISº) connector.
SST 09843±18020
(b) With engine stopped, turn the ignition switch ON.
(c) When the fuel return hose is pinched, the pressure within high pressure line will rise to approx. 392 kPa (4
kgf/cm2, 57 psi). In this state, check to see that there are
no leaks from any part of the fuel system.
NOTICE: Always pinch the hose. Avoid bending as it may
cause the hose to crack.
(d) Turn the ignition switch OFF.
(e) Remove SST from the check connector.
SST 09843±18020
±
EFI SYSTEM Inspection PrecautionsFI±15
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PRECAUTIONS
1. Before working on the fuel system, disconnect the cablefrom negative (±) terminal of the battery.
HINT: Any diagnostic code retained by the computer will be
erased when the battery terminal is removed. Therefore, if
necessary, read the diagnosis before removing the battery
terminal.
CAUTION: Work must be started after approx. 20 se-
conds or longer from the time the ignition switch is
turned to the ºLOCKº position and negative (±) terminal
cable is disconnected from the battery.
2. Do not smoke or work on open flame when working on the fuel system.
3. Keep gasoline away from rubber or leather parts.
INSPECTION PRECAUTIONS
MAINTENANCE PRECAUTIONS
1. CHECK CORRECT ENGINE TUNE±UP (See page EM±8)
2. PRECAUTIONS WHEN CONNECTING GAUGE (a) Use the battery as the power source for the timing light,tachometer, etc.
(b) Connect the test probe of a tachometer to the terminal IG of the check connector.
3. IN EVENT OF ENGINE MISFIRE, FOLLOWING PRECAUTIONS SHOULD BE TAKEN
(a) Check proper connection of battery terminals, etc.
(b) Handle high±tension cords carefully.
(c) After repair work, check that the ignition coil terminalsand all other ignition system lines are reconnected
securely.
(d) When cleaning the engine compartment, be especially careful to protect the electrical system from water.
4. PRECAUTIONS WHEN HANDLING OXYGEN SENSOR (a) Do not allow oxygen sensor to drop or hit against anobject.
(b) Do not allow the sensor to come into contact with water.
FI±12
± Precautions, Inspection PrecautionsEFI SYSTEM
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5. Check that there are no fuel leaks after performing anymaintenance on the fuel system.
(a) Using SST, connect terminals +B and FP of the check(ºDIAGNOSISº) connector.
SST 09843±18020
(b) With engine stopped, turn the ignition switch ON.
(c) When the fuel return hose is pinched, the pressure within high pressure line will rise to approx. 392 kPa (4
kgf/cm2, 57 psi). In this state, check to see that there are
no leaks from any part of the fuel system.
NOTICE: Always pinch the hose. Avoid bending as it may
cause the hose to crack.
(d) Turn the ignition switch OFF.
(e) Remove the SST from the check connector.
SST 09843±18020
FI±16
EFI SYSTEM
± Inspection Precautions
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SERVICE SPECIFICATIONS
SERVICE DATA
MA002±0B 








Engine 








Spark plug
Recommended spark plug
Correct electrode gap
Firing order
Valve clearance 








ND
NGK
Intake
Exhaust
\








\
PK20R11
BKR6EP11
1.1 mm (0.043 in.)
1 ± 8 ± 4 ± 3 ± 6 ± 5 ± 7 ± 2
0.15 ± 0.25 mm (0.006 ± 0.010 in.)
0.25 ± 0.35 mm (0.010 ± 0.014 in.)
 






BrakeFront and rear brakes
Pad thickness
Disc thickness
Limit
Limit (Front) (Rear)1.0 mm (0.039 in.)
30.0 mm (1.181 in.)
15.0 mm (0.591 in.)
 




Disc runout
Parking brake
Lining thickness
Drum inside diameter
()
Limit
Limit
Limit
()
0.05 mm (0.0020 in.)
1.0 mm (0.039 in.)
191 mm (7.520 in.)
 ChassisSteering linkage
Steering wheel freeplay
Limit30 mm (1.18 in.) 


gy
Ball joint
Vertical play
Limit
()
0.3 mm (0.012 in.)
MA002±0B
TORQUE SPECIFICATIONS
\
 \
Part tightened N
Vm kgf Vcm ft Vlbf
 Spark plug x Cylinder head1818013
 Front seat x Body3737527
 Front suspension crossmember x Body for nut1271,30094
  for bolt 201
,
2,050148
 Rear suspension member x Body1761,800130
 Rear suspension member rear cushion x Body3839028
±
MAINTENANCE (1UZ ± FE)MA±21
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MAINTENANCE
GENERAL NOTES:
wThere are 2 separate maintenance schedules,
namely A and B, which apply to different driving
conditions. Find out how the vehicle is driven,
select the appropriate schedule and service the
vehicle accordingly.
w Every service item in the periodic maintenance list
must be performed.
w Next to the columns of periods in the schedule,
reference pages have been added for easy access
to service data and procedures necessary for each
operation.
w The service interval for scheduled maintenance is
determined by the odometer reading or time
interval, whichever comes first, shown in the
schedule.
w Maintenance services after the last period should
be performed at the same interval as before unless
otherwise noted.
w Skipping even 1 item in the list can cause the
engine to run poorly and increase exhaust
emissions.
MA±1
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(1UZ±FE)
MAINTENANCE SCHEDULE
MA04E±01
SCHEDULE A
CONDITIONS:
Towing a trailer, using a camper or car top carrier.
 Repeated short trips of less than 8 km (5 miles) with outside temperature rema\
ining below freezing.
 Extensive idling and/or low speed driving for long distances, such as police, tax\
i or door±to±door
delivery use.
 Operating on dusty, rough, muddy or salt spread roads.
Maintenance operation: A = Check and adjust if necessary. R = Replace, change or lubricate.
I = Inspect and correct or replace if necessary.
V04408

mark indicates maintenance which is part of the warranty conditions for\
the Emission Control Systems.
The warranty period is in accordance with the owner's guide or the warranty booklet.
(
: California and New York specification vehicles only)
(1) Applicable to vehicles operated under conditions of extensive idling and/or low sp\
eed driving for long
distances such as police, taxi or door±to±door delivery use.
(2) Applicable when operating mainly on dusty roads.
(3) Includes inspection of fuel tank band and vaper vent system. MA±2
±
MAINTENANCE (1UZ ± FE)
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V04535
(4) Also applicable to drum lining for parking brake. For other usage condit\
ions, refer to SCHEDULE B.
(5) Check for leakage.
(6) Check for oil leaks from steering gear housing.
(7) Applicable only when operating mainly on rough, muddy roads. The applicable parts \
are listed below. Forother usage conditions, refer to SCHEDULE B.
Front and rear suspension member to cross body.
 Bolts for seat installation.
±
MAINTENANCE (1UZ ± FE)MA±3
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MA033±0C
SCHEDULE B
CONDITIONS:
Conditions others than those listed for SCHEDULE A.Maintenance operation: A = Check and adjust if necessary. R = Replace, change or lubricate.
I = Inspect and correct or replace if necessary.
V04409

mark indicates maintenance which is part of the warranty conditions for\
the Emission Control Systems.
The warranty period is in accordance with the owner's guide or the warranty booklet.
(
: California and New York specification vehicles only)
(1) Includes inspection of fuel tank band and vaper vent system.
(2) Also applicable to drum lining for parking brake.
(3) Check for leakage.
(4) Check for oil leaks from steering gear housing.
(5) The applicable parts are listed below. Front and rear suspension member to cross body.
 Bolts for seat installation.
MA±4
±
MAINTENANCE (1UZ ± FE)
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