Lexus SC300 / Lexus SC400. Manual - part 646

11.  REMOVE LH NO.3 TIMING BELT COVER

(a)  Remove the four mounting bolts.
(b) Disconnect 

the cord grommet from the timing belt cover,

and remove the timing belt cover.

(c)  Remove the cord grommet from the high–tension cord.

12.  REMOVE LOWER HIGH–TENSION CORD COVER

(a)  Disconnect the high–tension cord from the RH ignition

coil.

(b) Disconnect the  high–tension cords from the

high–tension cord cover.

(c)  Remove the bolt and cord cover.

13.  REMOVE THROTTLE BODY

(a)  Disconnect the following connectors:

(1)  Throttle position sensor connector
(2) (w/ 

TRAC)

Sub–throttle position sensor connector

(3) (w/ 

TRAC)

Sub–throttle actuator connector

(b)  Disconnect the following hoses:

(1)  Heat water hose from heater water valve

ST–8

–

STARTING SYSTEM

Starter

(2)  Water by–pass hose from ISC valve
(3) (USA 

Spec.)

Vacuum hose from throttle body

(4)  (Exc. USA Spec.)

Three vacuum hoses from throttle body

(c)  Remove the two bolts and two nuts, disconnect the

throttle body from the air intake chamber.

(d)  Disconnect the following hoses, and remove the throttle

body:

(1)  PCV hose from throttle body
(2)  Water by–pass hose from throttle body

(e)  Remove the throttle body gasket.

14. DISCONNECT 

CONNECTORS

Disconnect the following connectors:

•

Cold start injector connector

•

ISC valve connector

•

(USA Spec.)
EGR Valve connector

•

(Exc. USA Spec.)
VSV connector for EGR system

•

VSV connector for fuel pressure control system

–

STARTING SYSTEM

Starter

ST–9

15. DISCONNECT HOSES

Disconnect the following hoses:

(1)  Water by–pass hose (from water inlet housing)

from ISC valve

(2) Vacuum 

hose (from PS air control valve) from air in-

take chamber

(3)  Vacuum sensing hose (from fuel pressure regula-

tor) from vacuum pipe

(4)  Two vacuum hoses (from VSV for EVAP system)

from vacuum pipe

(5)  Vacuum hose (from charcoal canister) from vacu-

um pipe.

(6)  Water by–pass hose (from EGR valve) from water

by–pass pipe

(7)  Vacuum hose (from brake booster) from air intake

chamber

(8)  Vacuum hose (from VSV for heater water valve)

from air intake chamber

(9)  PCV hose from LH cylinder head cover

16.  REMOVE AIR INTAKE CHAMBER

(a)  Remove the bolt, stud bolt and accelerator bracket.

ST–10

–

STARTING SYSTEM

Starter

(b)  Remove the union bolt and two gaskets, and disconnect

the cold start injector tube from the RH delivery pipe.

(c)  Remove the two bolts and gasket, and disconnect the

EGR pipe from the air intake chamber.

(d)  Remove the four bolts, eight nuts and A/T throttle cable

bracket.

(e) (USA 

Spec.)

Disconnect the check (”DIAGNOSIS”) connector brack-
et from the air intake chamber.

(f)  (Exc. USA Spec.)

Remove the connector bracket from the check 
(”DIAGNOSIS”) connector.

(g)  Remove the air intake chamber assembly and four

gaskets.

17.  DISCONNECT FUEL INLET HOSE FROM LH DELIVERY

PIPE
Remove the pulsation damper and two gaskets, and discon-
nect the inlet hose.

18. DISCONNECT FUEL RETURN HOSE FROM FUEL

RETURN PIPE

–

STARTING SYSTEM

Starter

ST–11