1991 LEXUS SC400 Service Repair Manual

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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

Page 1351 of 4087

LEXUS SC400 1991 Service Repair Manual
(e) Check whether the engine rpm increases 100±300 rpmunder the following conditions:
Coolant temp.
Below 45 5C (113 5F) . . . NO increase
Above 50 5C (122 5F) . . . Increases
INSPECTION OF VSV
1.

Page 1352 of 4087

LEXUS SC400 1991 Service Repair Manual
2) Apply battery voltage across the terminals
3) Check that the air flows from port E to port G
If operation is not as specified, replace the VSV.
3. REINSTALL VSV (a) Install the VSV with the nut.

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