ground clearance LEXUS SC300 1991 Service Repair Manual

(f) Gradually heat the cylinder head to 80 ± 100
C (176 ±
212
F).
(g) Using SST and a hammer, tap in a new guide bushing until the snap ring makes contact with the cylinder head.
SST 09201±70010
(h) Using a sharp 6 mm reamer, ream the guide bushing to obtain
the standard specified clearance (See step 5 above)
between the guide bushing and valve stem.
7. INSPECT AND GRIND VALVES
(a) Grind the valve enough to remove pits and carbon.
(b) Check that the valve is ground to the correct valve face angle.
Valve face angle:
44.55
(c) Check the valve head margin thickness.
Standard margin thickness:
1.0 mm (0.039 in.)
Minimum margin thickness: 0.5 mm (0.020 in.)
If the margin thickness is less than minimum, replace the
valve.
±
1UZ±FE ENGINE ENGINE MECHANICALEG±99
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(e) Using a sharp 6 mm reamer, ream the guide bushing toobtain the standard specified clearance (See page
EM±45) between the guide bushing and valve stem.
7. INSPECT AND GRIND VALVES (a) Grind the valve enough to remove pits and carbon.
(b) Check that the valve is ground to the correct valve faceangle.
Valve face angle: 44.5 5
(c) Check the valve head margin thickness.
Standard margin thickness: 0.8±1.2 mm
(0.031±0.047 in.)
Minimum margin thickness: 0.5 mm (0.020 in.)
If the margin thickness is less than minimum, replace the
valve.
(d) Check the valve overall length.
Standard overall length: Intake 98.29±98.79 mm (3.8697±3.8894 in.)
Exhaust 98.84±99.34 mm (3.8657±3.9110 in.)
Minimum overall length: Intake 98.19 mm (3.8657 in.)
Exhaust 98.74 mm (3.8874 in.)
If the overall length is less than minimum, replace the valve.
(e) Check the surface of the valve stem tip for wear.
If the valve stem tip is worn, resurface the tip with a grinder
or replace the valve.
NOTICE: Do not grind off more than the minimum overall
length.
EM±46
±
ENGINE MECHANICAL Cylinder Head
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(g) Using SST and a hammer, tap in a new guide bushinguntil the snap ring makes contact with the cylinder head.
SST 09201±70010
HINT: Different the bushings are used for the intake and ex-
haust.
(h) Using a sharp 6 mm reamer, ream the guide bushing to obtain the standard specified clearance (See page
EM±80 ) between the guide bushing and valve stem.
7. INSPECT AND GRIND VALVES (a) Grind the valve enough to remove pits and carbon.
(b) Check that the valve is ground to the correct valve faceangle.
Valve face angle: 44.5 5
(c) Check the valve head margin thickness.
Standard margin thickness: 1.0 mm (0.039 in.)
Minimum margin thickness: 0.5 mm (0.020 in.)
If the margin thickness is less than minimum, replace the
valve.
EM±82
±
ENGINE MECHANICAL Cylinder Heads
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SERVICE SPECIFICATIONS
SERVICE DATA
Fuel pumpResistance0.2 ± 3.0

Cold start
injectorResistance
Fuel leakage2 ± 4

One drop or less per minute
Fuel pressure
regulatorFuel pressureat no vacuum265 ± 304 kPa
(2.7 ± 3.1 kgf/cm2, 38 ± 44 psi)
InjectorResistance
Injection volume
Difference between each cylinder
Fuel leakage13.4 ± 14.2

55 ± 70 cc (3.4 ± 4.3 cu in.) per 15 sec.
10 cc (0.6 cu in.) or less
One drop or less per minute
Air flow meterResistance (THA ± E2)at±20 °C (±4 °F)
at 0 °C (32 °F)
at 20 °C (68 °F)
at 40 °C (104 °F)
at 60 °C (140 °F)
at 80 °C (176 °F)10 ± 20 k

4 ± 7 k

2 ± 7 k

0.9 ± 1.3 k

0.4 ± 0.7 k

0.2 ± 0.4 k

Throttle bodyThrottle body fully closed angle6°
Throttle
positionClearance between
stop screw and leverBetween terminalsResistance
sensor
(main)0 mm
0.40 mm
0.65 mm0 in.
0.016 in.
0.026 in.VTA1 ± E2 IDL1 ± E2
IDL1 ± E2
VTA1 E2
0.2 ± 0.8 k

2.3 k
or less
Infinity
33 100k
Throttle valve fully opened position
±VTA1 ± E2VC ± E2
y
3.3 ± 10.0 k

4.0 ± 9.0 k

Sub±throttle
positionClearance between
stop screw and leverBetween terminalsResistance
sensor
(w/ TRAC)0 mm
0.30 mm
0.50 mm0 in.
0.012 in.
0.020 in.VTA2 ± E2 IDL2 ± E2
IDL2 ± E2
VTA2 E2
0.2 ± 0.8 k

2.3 k
or less
Infinity
33 100k
Throttle valve fully opened position
±VTA2 ± E2VC ± E2
y
3.3 ± 10.0 k

4.0 ± 9.0 k

Sub±throttle
actuator
(w/ TRAC)Resistance (ACM ± A and A, BCM ± B and B)0.5 ± 1.0

ISC valveResistance (B1 ± S1 and S3, B2 ± S2 and S4)10 ± 30

Cold start
injector time
switchResistance STA ± STJ below 15 °C (59 °F)
above 30 °C (86 °F)
STA ± Ground25 ± 45

65 ± 85
25 ± 85

VSV for fuel
pressure
controlResistance37 ± 44

FI±137 ± Service SpecificationsEFI SYSTEM
WhereEverybodyKnowsYourName

(g) Using SST and a hammer, tap in a new guide bushinguntil the snap ring makes contact with the cylinder head.
SST 09201±70010
HINT: Different the bushings are used for the intake and ex-
haust.
(h) Using a sharp 6 mm reamer, ream the guide bushing to obtain the standard specified clearance (See page
EM±80 ) between the guide bushing and valve stem.
7. INSPECT AND GRIND VALVES (a) Grind the valve enough to remove pits and carbon.
(b) Check that the valve is ground to the correct valve faceangle.
Valve face angle: 44.5 5
(c) Check the valve head margin thickness.
Standard margin thickness: 1.0 mm (0.039 in.)
Minimum margin thickness: 0.5 mm (0.020 in.)
If the margin thickness is less than minimum, replace the
valve.
EM±82
±
ENGINE MECHANICAL Cylinder Heads
WhereEverybodyKnowsYourName

SERVICE SPECIFICATIONS
SERVICE DATA
Fuel pumpResistance0.2 ± 3.0

Cold start
injectorResistance
Fuel leakage2 ± 4

One drop or less per minute
Fuel pressure
regulatorFuel pressureat no vacuum265 ± 304 kPa
(2.7 ± 3.1 kgf/cm2, 38 ± 44 psi)
InjectorResistance
Injection volume
Difference between each cylinder
Fuel leakage13.4 ± 14.2

55 ± 70 cc (3.4 ± 4.3 cu in.) per 15 sec.
10 cc (0.6 cu in.) or less
One drop or less per minute
Air flow meterResistance (THA ± E2)at±20 °C (±4 °F)
at 0 °C (32 °F)
at 20 °C (68 °F)
at 40 °C (104 °F)
at 60 °C (140 °F)
at 80 °C (176 °F)10 ± 20 k

4 ± 7 k

2 ± 7 k

0.9 ± 1.3 k

0.4 ± 0.7 k

0.2 ± 0.4 k

Throttle bodyThrottle body fully closed angle6°
Throttle
positionClearance between
stop screw and leverBetween terminalsResistance
sensor
(main)0 mm
0.40 mm
0.65 mm0 in.
0.016 in.
0.026 in.VTA1 ± E2 IDL1 ± E2
IDL1 ± E2
VTA1 E2
0.2 ± 0.8 k

2.3 k
or less
Infinity
33 100k
Throttle valve fully opened position
±VTA1 ± E2VC ± E2
y
3.3 ± 10.0 k

4.0 ± 9.0 k

Sub±throttle
positionClearance between
stop screw and leverBetween terminalsResistance
sensor
(w/ TRAC)0 mm
0.30 mm
0.50 mm0 in.
0.012 in.
0.020 in.VTA2 ± E2 IDL2 ± E2
IDL2 ± E2
VTA2 E2
0.2 ± 0.8 k

2.3 k
or less
Infinity
33 100k
Throttle valve fully opened position
±VTA2 ± E2VC ± E2
y
3.3 ± 10.0 k

4.0 ± 9.0 k

Sub±throttle
actuator
(w/ TRAC)Resistance (ACM ± A and A, BCM ± B and B)0.5 ± 1.0

ISC valveResistance (B1 ± S1 and S3, B2 ± S2 and S4)10 ± 30

Cold start
injector time
switchResistance STA ± STJ below 15 °C (59 °F)
above 30 °C (86 °F)
STA ± Ground25 ± 45

65 ± 85
25 ± 85

VSV for fuel
pressure
controlResistance37 ± 44

FI±137 ± Service SpecificationsEFI SYSTEM
WhereEverybodyKnowsYourName

DIAGNOSTIC TROUBLE CODE
CLEARANCE
Using diagnostic check wire:(a) Connect the 2 service wires to terminals Tc and AB of DLC1.
(b) Turn the ignition switch ACC or ON And wait approx. 6 seconds.
(c) Starting with the Tc terminal, apply body ground alternately to terminal Tc and terminal AB twice each in cycles of 1.0
seconds Confirm that body ground is absolute. Finally, keep
applying body ground to terminal Tc.
HINT: When alternately grounding terminals Tc and AB, re-
lease ground from one terminal and immediately apply it to
the other terminal within an interval of 0.2 second. If diagnos-
tic trouble codes do not clear, repeat the above procedure un-
til the codes are cleared.
(d) Several seconds after performing the clearing procedure, theSRS warning light will blink in a 50 m sec cycle to indicate the
codes have been cleared.
±
SUPPLEMENTAL RESTRAINT SYSTEM TROUBLESHOOTINGRS±63
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236
GROUND POINT
FRONT TURN SIGNAL
LIGHT LH
ENGINE HOOD
COURTESY SW
TRACTION PUMP AND
MOTOR
HEATER RELAY
ABS ACTUATOR RELAY
TELEPHONE
TRANSCEIVER
AND SPEAKER RELAY
ENGINE OIL LEVEL
WARNING SW
COMBINATION METER
(E1 )
EFI ECU
TRACTION ECU
CHECK CONNECTOR
(
E1 ) CORNERING LIGHT LH
FRONT SIDE MAKER
LIGHT LH
BRAKE FLUID LEVEL
SW
FRONT CLEARANCE
LIGHT LH
FRONT SIDE MAKER
LIGHT RH
FRONT CLEARANCE
LIGHT RH
ABS ACTUATOR
FRONT TURN SIGNAL
LIGHT RH
CRUISE CONTROL
ACTUATOR
OXYGEN SENSOR SUB
(
FOR USA SPEC. )
TDCL (
E1 )
WASHER LEVEL SW EFI MAIN RELAY
CORNERING LIGHT RH
A/C PRESSURE SW
(HI GH PRESSURE )
AIR FLOW METER POWER STERRI NG
PRESSURE SW
NOISE FI LTER
(
FOR IGNI TION SYSTEM ) E4
E10
E12 2
2
BS1 4 E4
E7
E1 E5
EB EA I23
I33
E1 6
I32
E20
E20
E20
IK2 24
ED EC IK1
1 BY1
5
W±B
W±B
W±B
W±B
W±B
W±B
W±B
W±B
W± B W±B
W±B
W±B
W±B
W±B
W±B
W±B
W±B
W±B
W±B
W±B
W±B BR
BR
W±B BR
BR
BR
W±B BR
BR±B BR BR
BR
BR
W± B
W± B
W± B
W± B
W± B
W± B
W± B
W±B
W±B
BR
BR
BR
BR BR
BR
BR
W±B
BR BR
BR
( EO1 )
( E11 )
( E1 )
( EO2 )
I27BR
(
S1 )
( E1 )
NOISE FILTER (
FOR
IGNITION SYSTEM )W±B
W/ TRACTION SYSTEM
NOI SE FILTER
(
FOR DEFOGGER SYSTEM )
W±B
W±B
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