1991 LEXUS SC400 Service Repair Manual

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Page 2857 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 2858 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 2859 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 2860 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 2861 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

Page 2862 of 4087

LEXUS SC400 1991 Service Repair Manual INSPECTION OF VSV 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 is turned to the ºLOCKº

Page 2863 of 4087

LEXUS SC400 1991 Service Repair Manual 4. INSPECT VSV A. Inspect VSV for open circuitUsing an ohmmeter, check that there is continuity between the terminals. Resistance (Cold): 30±34  If there is no continuity, replace the VSV. B. Ins

Page 2864 of 4087

LEXUS SC400 1991 Service Repair Manual (c) Connect the following hoses:(1) Vacuum hose (from vacuum pipe) to VSV (2) Vacuum hose (from charcoal canister) to VSV (d) Connect the VSV connector. 6. REINSTALL INTAKE AIR CONNECTOR (a) Co
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