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 
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

Page 1345 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 1346 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 1347 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

Page 1348 of 4087

LEXUS SC400 1991  Service Repair Manual 
3. REINSTALL CHECK VALVEHINT: Reinstall the check valve with the black port facing the
charcoal canister side.
(a)  Install the grommet to the check valve.
(b)  Install the check valve to the hose en

Page 1349 of 4087

LEXUS SC400 1991  Service Repair Manual 
EXHAUST GAS RECIRCULATION (EGR) SYSTEM
DESCRIPTION
To reduce NOx emission, part of the exhaust gases are recirculated through\
 the EGR valve to the intake man-
ifold to lower the maximum combustion

Page 1350 of 4087

LEXUS SC400 1991  Service Repair Manual 
INSPECTION OF EGR SYSTEM
1.  CHECK AND CLEAN FILTER IN EGR VACUUMMODULATOR
(a)  Remove the cap and filter.
(b)  Check the filter for contamination or damage.
(c)  Using compressed air, clean the filt
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