1991 LEXUS SC400 Service Repair Manual

Page 2473 of 4087

LEXUS SC400 1991  Service Repair Manual 
3. INSPECT VSV
A.  Inspect VSV for open circuitUsing an ohmmeter, check that there is continuity between
the terminals.
Resistance (Cold): 37±44  
If there is no continuity, replace the VSV.
B. Ins

Page 2474 of 4087

LEXUS SC400 1991  Service Repair Manual 
(b)  (Exc. USA Spec.)Install the water by±pass pipe to the VSV with the bolt.
(c)  Connect the following hoses to VSV: (1)  Vacuum hose (from fuel pressure regulator)
(2)  Vacuum hose (from air inta

Page 2475 of 4087

LEXUS SC400 1991  Service Repair Manual 
VSV for EVAP
INSPECTION OF VSV FOR EVAP
(See Emission Control System on page EC±11) FI±95
                                ±   Electronic Control System (VSV f\
or EVAP)EFI SYSTEM 
WhereEverybodyKn

Page 2476 of 4087

LEXUS SC400 1991  Service Repair Manual 
VSV for EGR (Exc. USA Spec.)
INSPECTION OF VSV FOR EGR
(See Emission Control Systems on page EC±18)
FI±96
                                          ±   Electronic Control Syst\
em (VSV for EGR (Ex

Page 2477 of 4087

LEXUS SC400 1991  Service Repair Manual 
EGR Valve (USA Spec. only)
INSPECTION OF VSV FOR EGR
(See Emission Control Systems on page EC±21) FI±97
                                    ±   Electronic Control System (E\
GR Valve (USA Spec. On

Page 2478 of 4087

LEXUS SC400 1991  Service Repair Manual 
Water Temperature Sensor
COMPONENTS FOR REMOVAL AND
INSTALLATION
FI±98                                           ±   Electronic Control Sys\
tem (Water Temperature Sensor)EFI SYSTEM 
WhereEverybody

Page 2479 of 4087

LEXUS SC400 1991  Service Repair Manual 
INSPECTION OF WATER TEMPERATURE
SENSOR
1.  REMOVE LOWER HIGH±TENSION CORD COVER(See steps 1, 2 and 5 to 12 on pages  FI±27 to 29)
2.  REMOVE RH IGNITION COIL (a)  Disconnect the ignition coil conne

Page 2480 of 4087

LEXUS SC400 1991  Service Repair Manual 
6. INSPECT WATER TEMPERATURE SENSORUsing an  ohmmeter, measure the resistance between the ter-
minals.
Resistance: Refer to the chart graph
If the resistance is not as specified, replace the sensor.