1991 LEXUS SC400 Service Repair Manual

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Page 2873 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 2874 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 2875 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 2876 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 2877 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 (N2), carbon dioxide (CO2) and water (H2O) by the catalyst. OPE

Page 2878 of 4087

LEXUS SC400 1991 Service Repair Manual INSPECTION OF EXHAUST PIPE ASSEMBLY 1. CHECK CONNECTIONS FOR LOOSENESS OR DAMAGE 2. CHECK CLAMPS FOR WEAKNESS, CRACKS OR DAMAGE INSPECTION OF CATALYTIC CONVERTERS CHECK FOR DENTS OR DAMAGE If any pa

Page 2879 of 4087

LEXUS SC400 1991 Service Repair Manual COMPONENTS FOR REPLACEMENT OF CATALYTIC CONVERTERS (Contd) REPLACEMENT OF CATALYTIC CONVERTERS (Main Catalytic Converters) 1. REMOVE CATALYTIC CONVERTERS (MAIN) (a) Check that the converter is coo

Page 2880 of 4087

LEXUS SC400 1991 Service Repair Manual (Sub±Catalytic Converter (USA Spec. only) 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
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