1991 LEXUS SC400 Service Repair Manual

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Page 1329 of 4087

LEXUS SC400 1991 Service Repair Manual COMPONENTS FOR REPLACEMENT OF CATALYTIC CONVERTERS (Contd) REPLACEMENT OF CATALYTIC CONVERTERS (Main Catalytic Converters) 1. REMOVE CATALYTIC CONVERTERS (MAIN) (a) Check that the converter is coo

Page 1330 of 4087

LEXUS SC400 1991 Service Repair Manual (Sub±Catalytic Converter (USA Spec. only) 1. DISCONNECT CABLE FROM NEGATIVE TERMINAL OFBATTERY CAUTION: Work must be started after, approx. 20 se- conds or longer from the time the ignition switch

Page 1331 of 4087

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

Page 1333 of 4087

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

Page 1334 of 4087

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

Page 1335 of 4087

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

Page 1336 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 t\ he PCV valve to the air intake cham- ber for combustion in the cylinder
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