1991 LEXUS SC300 Service Repair Manual

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Page 2457 of 4087

LEXUS SC300 1991 Service Repair Manual INSTALLATION OF THROTTLE BODY (See Components o page FI±69) 1. INSTALL THROTTLE BODY (a) Install the two water by±pass hoses and pipe to thethrottle body. (b) Connect the following hoses: (1) P

Page 2458 of 4087

LEXUS SC300 1991 Service Repair Manual (4) Heater water hose to heater water valve (f) Connect the following connectors: (1) Throttle position sensor connector (2) (w/ TRAC) Sub±throttle position sensor connector (3) (w/ TRAC) Sub±thr

Page 2459 of 4087

LEXUS SC300 1991 Service Repair Manual (d) Connect the following hoses:(1) Air hose to ISC valve (2) Air hose (from PS air control valve) to intake air con- nector 4. CONNECT CONTROL CABLES TO THROTTLE BODY Connect the following cable

Page 2460 of 4087

LEXUS SC300 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 2461 of 4087

LEXUS SC300 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 2462 of 4087

LEXUS SC300 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 2463 of 4087

LEXUS SC300 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 2464 of 4087

LEXUS SC300 1991 Service Repair Manual ELECTRONIC CONTROL SYSTEM Location of Electronic Control Parts FI±84 ± Electronic Control\ System (Location of Electronic Control Parts)EFI SYSTEM
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