1991 LEXUS SC400 Service Repair Manual

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Page 1361 of 4087

LEXUS SC400 1991 Service Repair Manual
COMPONENTS FOR REMOVAL AND INSTALLATION OF EGR VALVE
±
EMISSION CONTROL SYSTEMS Exhaust Gas Recirculation (EGR) SystemEC±21
WhereEverybodyKnowsYourName

Page 1362 of 4087

LEXUS SC400 1991 Service Repair Manual
INSPECTION OF EGR VALVE
(USA Spec.)
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
turn

Page 1363 of 4087

LEXUS SC400 1991 Service Repair Manual
B. Inspect EGR valve operation(a) Remove the three bolts and stepping motor from thehousing.
(b) Apply battery voltage to terminal B1 (or B2), and while repeately grounding (*S4)±(S4 and *S3)±(S

Page 1364 of 4087

LEXUS SC400 1991 Service Repair Manual
(b) Install the EGR valve with the two nuts.
Torque: 18 NVm (185 kgf Vcm, 13 ft Vlbf)
(c) Connect the following hoses:
(1) Water by±pass hose (from ISC valve) to the EGR valve
(2) Water by±pass

Page 1365 of 4087

LEXUS SC400 1991 Service Repair Manual
3. INSPECT EGR VALVECheck for sticking and heavy carbon deposits.
If a problem is found, replace the EGR valve assembly.
4. REINSTALL EGR VALVE (a) Place a new gasket on the EGR valve adaptor.
NOT

Page 1366 of 4087

$LEXUS SC400 1991 Service Repair Manual THREE±WAY CATALYST (TWC) SYSTEM DESCRIPTION To reduce HC, CO and NOx emissions, they are oxidized, reduced and convert\ ed to nitrogen (N), carbon diox- ide (CO) and water (HO) by the catalyst. OPER$

Page 1367 of 4087

LEXUS SC400 1991 Service Repair Manual
COMPONENTS
REPLACEMENT OF CATALYTIC
CONVERTERS
(Front Catalytic Converter)
1. REMOVE CATALYTIC CONVERTER (FRONT)(a) Check that the converter is cool.
(b) Remove the two bolts and nuts holding the

Page 1368 of 4087

LEXUS SC400 1991 Service Repair Manual
(Rear Catalytic Converter)
1. (USA Spec.)REMOVE SUB±OXYGEN SENSOR
Remove the two nuts and sub±oxygen sensor from the front
exhaust pipe.
2. REMOVE REAR CATALYTIC CONVERTER (FRONT EXHAUST PIPE)
(a

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