Lexus SC300 / Lexus SC400. Manual - part 725

(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

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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

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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

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STARTING SYSTEM

Starter

ST–11

19.  DISCONNECT EGR PIPE FROM RH CYLINDER HEAD

Remove the bolt holding the EGR pipe to the cylinder head,
and disconnect the EGR pipe.

20.  DISCONNECT ENGINE WIRE FROM INTAKE MANIFOLD

Remove the two bolts, and disconnect the engine wire.

21.  DISCONNECT ENGINE WIRE FROM DELIVERY PIPES,

REAR WATER BY–PASS JOINT AND RH CYLINDER
HEAD
(a)  Remove the four bolts holding the engine wire to the

delivery pipes, and disconnect the engine wire from the
delivery pipe.

(b) Remove 

the two bolts holding the engine wire to the rear

water by–pass joint, and disconnect the engine wire
from the rear water by–pass joint.

(c) Remove 

the two bolts holding the engine wire to the rear

side of the RH cylinder head, and disconnect the engine
wire from the RH cylinder head.

(d)  Disconnect the two engine wire connectors from the

connector bracket on the front side of the LH delivery
pipe.

(e)  Disconnect the eight injector connectors.

ST–12

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STARTING SYSTEM

Starter