1991 LEXUS SC400 Service Repair Manual

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Page 2449 of 4087

LEXUS SC400 1991 Service Repair Manual COMPONENTS FI±69EFI SYSTEM ± Air Induction System (Throttle Body) WhereEverybodyKnowsYourName

Page 2450 of 4087

LEXUS SC400 1991 Service Repair Manual REMOVAL OF THROTTLE BODY (See Components on page FI±69) 1. DISCONNECT CABLE FROM NEGATIVE TERMINAL OF BATTERY CAUTION: Work must be started after approx. 20 se- conds or longer from the time the ig

Page 2451 of 4087

LEXUS SC400 1991 Service Repair Manual 6. REMOVE UPPER HIGH±TENSION CORD COVER(a) Remove the two mounting bolts. (b) Disconnect the front side claw groove of the cord coverfrom the claw of the lower cover, and remove the cord cover.

Page 2452 of 4087

LEXUS SC400 1991 Service Repair Manual (c) Remove the two bolts and two nuts, disconnect thethrottle body from the air intake chamber. (d) Disconnect the following hoses, and remove the throttle body: (1) PCV hose from throttle body (

Page 2453 of 4087

LEXUS SC400 1991 Service Repair Manual INSPECTION OF THROTTLE BODY 1. CLEAN THROTTLE BODY(a) Using a soft brush and carburetor cleaner, clean the cast parts. (b) Using compressed air, clean all the passages and apertures. NOTICE: To pr

Page 2454 of 4087

LEXUS SC400 1991 Service Repair Manual (b) Insert a 0.40 mm (0.016 in.) feeler gauge, between thethrottle stop screw and stop lever. (c) Connect the test probe of an ohmmeter to the terminals IDL1 and E2 of the sensor. (d) Gradually t

Page 2455 of 4087

LEXUS SC400 1991 Service Repair Manual C. Inspect sub±throttle valveCheck that there is no clearance between the throttle stop screw and throttle valve gear when the sub±throttle valve is fully closed. D. Inspect sub±throttle position

Page 2456 of 4087

LEXUS SC400 1991 Service Repair Manual (d) Gradually turn the sensor clockwise until the ohmmeterdeflects, and secure it with the two set screws. (e) Recheck the continuity between terminals IDL2 and E2. Clearance between lever and sto
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