1991 LEXUS SC400 Service Repair Manual

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Page 1929 of 4087

LEXUS SC400 1991 Service Repair Manual If the resistance is not as specified, replace the sensor as fol- lows: wDisconnect the grommet from the floor panel, and pull out the wire of the sub±oxygen sensor from the floor panel. w Remove t

Page 1930 of 4087

LEXUS SC400 1991 Service Repair Manual 13. REINSTALL TRANSMISSION SHIFT LEVER KNOB(A/T) (a) Slide the lever cover on the lever shaft. (b) Install the shift lever knob with the two screws. (c) Attach the l ever cover to the lower side

Page 1931 of 4087

LEXUS SC400 1991 Service Repair Manual Idle Speed Control (ISC) Valve ON±VEHICLE INSPECTION INSPECT ISC VALVE FOR OPERATING SOUNDCheck that there is a clicking sound immediately after stop- ping the engine. If the rpm operation is not as

Page 1932 of 4087

LEXUS SC400 1991 Service Repair Manual COMPONENTS REMOVAL OF ISC VALVE 1. REMOVE LOWER HIGH±TENSION CORD COVER(See steps 1, 2 and 5 to 12 on pages FI±27 to 29) 2. REMOVE ISC VALVE (a) Disconnect the ISC valve connector. (b) (USA Spe

Page 1933 of 4087

LEXUS SC400 1991 Service Repair Manual (d) Disconnect the following hoses from the ISC valve:(1) Water by±pass hose (from throttle valve) (2) Water by±pass hose (from water inlet housing) (3) Water by±pass hose (from EGR valve) (e)

Page 1934 of 4087

LEXUS SC400 1991 Service Repair Manual INSTALLATION OF ISC VALVE (See Components on page FI±81) 1. INSTALL ISC VALVE (a) Install a new gasket and the ISC valve with the two nuts. Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf) (b) Connect t

Page 1935 of 4087

LEXUS SC400 1991 Service Repair Manual Fuel Pump ECU COMPONENTS FOR REMOVAL AND INSTALLATION ± EFI SYSTEM Electronic Control System (Fuel pump ECU)FI±81 WhereEverybodyKnowsYourName

Page 1936 of 4087

LEXUS SC400 1991 Service Repair Manual INSPECTION OF FUEL PUMP ECU 1. DISCONNECT CABLE FROM NEGATIVE TERMINAL OFBATTERY CAUTION: Turn the ignition switch to ºLOCKº. Discon- nect the cable from the negative (±) terminal of the bat- ter
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