1991 LEXUS SC400 Service Repair Manual

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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

Page 1338 of 4087

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

Page 1339 of 4087

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.

Page 1341 of 4087

LEXUS SC400 1991 Service Repair Manual INSPECTION OF PCV VALVE 1. REMOVE PCV VALVE(a) Disconnect the PCV hose from the PCV valve. (b) Remove the PCV valve. 2. INSTALL CLEAN HOSE TO PCV VALVE 3. INSPECT PCV VALVE OPERATION (a) Blow a

Page 1342 of 4087

LEXUS SC400 1991 Service Repair Manual FUEL EVAPORATIVE EMISSION CONTROL (EVAP) SYSTEM DESCRIPTION To reduce HC emission, evaporated fuel from the fuel tank is routed throug\ h the charcoal canister to the intake manifold for combustion i

Page 1343 of 4087

LEXUS SC400 1991 Service Repair Manual 3. VISUALLY INSPECT FUEL TANK CAPCheck if the cap and/or gasket are deformed or damaged. If necessary, repair or replace the cap. INSPECTION OF CHARCOAL CANISTER 1. REMOVE CHARCOAL CANISTER(a) Dis

Page 1344 of 4087

LEXUS SC400 1991 Service Repair Manual 4. CLEAN FILTER IN CANISTERClean the filter by blowing 294 kPa (3 kgf/cm2, 43 psi) of com- pressed air into port A while holding port B closed. NOTICE: w Do not attempt to wash the canister. w No a
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