LEXUS SC400 1991 Service Repair Manual

LEXUS SC400 1991 Service Repair Manual SC400 1991 LEXUS LEXUS https://www.carmanualsonline.info/img/36/57051/w960_57051-0.png LEXUS SC400 1991 Service Repair Manual
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LEXUS SC400 1991  Service Repair Manual 
SERVICE SPECIFICATIONS
SERVICE DATA
VSVResistance30±34 
for EVAP
VSVResistance33±39 
for EGR
EGR valveResistance19.9±23.4  
(CALIF. only)
TORQUE SPECIFICATIONS
Part tightenedNVmkgf Vcmft Vlbf
V

Page 1332 of 4087

LEXUS SC400 1991  Service Repair Manual 
EMISSION CONTROL SYSTEM
NOTE: The specification descriptions ºUSA Spec.º and
º Exc. USA Spec. º used in this section indicate the following
specifications.
USA Spec .: USA (50 States) Specificati

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LEXUS SC400 1991  Service Repair Manual 
DESCRIPTION
The emission control systems are installed to reduce the amount of HC, CO, \
and NOx emitted from the en-
gine, and to also prevent the release of evaporated fuel from the gasoline ta\
nk

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LEXUS SC400 1991  Service Repair Manual 
COMPONENTS LAYOUT (Contd)
±
EMISSION CONTROL SYSTEMS DescriptionEC±3 
WhereEverybodyKnowsYourName

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LEXUS SC400 1991  Service Repair Manual 
SCHEMATIC DRAWING
EC±4±
EMISSION CONTROL SYSTEMS Description 
WhereEverybodyKnowsYourName

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LEXUS SC400 1991  Service Repair Manual 
POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM
DESCRIPTION
To reduce HC emission, crankcase blow±by gas (HC) is routed through t\
he PCV valve to the air intake cham-
ber for combustion in the cylinder

Page 1337 of 4087

LEXUS SC400 1991  Service Repair Manual 
INSPECTION OF PCV VALVE
1.  REMOVE PCV VALVE
2.  ATTACH CLEAN HOSE TO PCV VALVE
3.  BLOW AIR FROM CYLINDER HEAD SIDECheck that air passes through easily.
NOTICE: Do not suck air through the valve.
Pe

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LEXUS SC400 1991  Service Repair Manual 
SCHEMATIC DRAWING
PREPARATION
SST (SPECIAL SERVICE TOOLS)
IllustrationPart No.Part NameNote
09843±18020Diagnosis Check Wire
for EGR system inspection
RECOMMENDED TOOLS
IllustrationPart No.Part NameN

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LEXUS SC400 1991  Service Repair Manual 
PREPARATION
SST (SPECIAL SERVICE TOOL)
RECOMMENDED TOOLS
EQUIPMENT
Part NameNote
Engine tune±up testerEngine speed
±
EMISSION CONTROL SYSTEMS PreparationEC±5 
WhereEverybodyKnowsYourName

Page 1340 of 4087

LEXUS SC400 1991  Service Repair Manual 
POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM
DESCRIPTION
To reduce HC emission, crankcase blow±by gas (HC) is routed through the PCV valve to the air intake cham-
ber for combustion in the cylinders.
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