1991 LEXUS SC400 Service Repair Manual

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Page 1321 of 4087

LEXUS SC400 1991 Service Repair Manual 4. REMOVE OIL COOLERRemove the three bolts and oil cooler. INSPECTION OF OIL COOLER INSPECT OIL COOLER Check the oil cooler for damage or clogging. If necessary, replace the oil cooler. INSTALLATION

Page 1322 of 4087

LEXUS SC400 1991 Service Repair Manual Electronic Control Parts (System Circuit) (Cooling Fan ECU) COMPONENTS FOR REMOVAL AND INSTALLATION CO±60± COOLIING SYSTEM Electronically Controlled Hydraulic Cooling Fan (Electronic Control Parts)

Page 1323 of 4087

LEXUS SC400 1991 Service Repair Manual INSPECTION OF COOLING FAN ECU 1. DISCONNECT CABLE FROM NEGATIVE TERMINAL OFBATTERY CAUTION: Work must be started after 20 seconds or longer from the time the ignition switch is turned to the ºLOCK

Page 1324 of 4087

LEXUS SC400 1991 Service Repair Manual (Water Temperature Sensor) COMPONENTS FOR REMOVAL AND INSTALLATION INSPECTION OF WATER TEMPERATURE SENSOR 1. DISCONNECT CABLE FROM NEGATIVE TERMINAL OFBATTERY CAUTION: Work must be started after 20

Page 1325 of 4087

LEXUS SC400 1991 Service Repair Manual 5. INSPECT WATER TEMPERATURE SENSORUsing an ohmmeter, measure the resistance between the ter- minals. Resistance: 1.48±1.58 k  at 80 5C (176 5F) If the resistance is not as specified, replace the

Page 1326 of 4087

LEXUS SC400 1991 Service Repair Manual SERVICE SPECIFICATIONS SPECIFICATIONS VSV (For EVAP) Resistance30±34  VSV (For EGR)Resistance33±39  TORQUE SPECIFICATIONS Part tightenedN mkgf cmftVlbf VSV for EGR X Intake manifold18185 13 EGR v

Page 1327 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 1328 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
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