Lexus SC300 / Lexus SC400. Manual - part 651

12.  INSTALL AIR INTAKE CHAMBER

(a)  Place four new gaskets and the air intake chamber on

the intake manifold.

(b) Temporarily 

install a new gasket and the EGR pipe to air

intake chamber with the two bolts.

(c)  (Exc. USA Spec.)

Install the connector bracket to check (”DIAGNOSIS”)
connector.

(d)  Install the air intake chamber and following parts with

the four bolts and eight nuts:

(1)  Check (”DIAGNOSIS”) connector
(2)  A/T throttle cable bracket
(3)  VSV for fuel pressure control system
(4)  VSV for EGR system

Torque: 18 N

⋅

m (185 kgf

⋅

cm, 13 ft

⋅

lbf)

HINT: Use bolts 40 mm (1.57 in.) of length.

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–

STARTING SYSTEM

Starter

(e)  Tighten the bolt holding the EGR pipe to the air intake

chamber.

Torque: 18 N

⋅

m (185 kgf

⋅

cm, 13 ft

⋅

lbf)

(f) Tighten 

the bolt holding the EGR pipe to the RH cylinder

head.

Torque: 18 N

⋅

m (185 kgf

⋅

cm, 13 ft

⋅

lbf)

(g)  Connect the cold start injector tube to the RH delivery

pipe with two new gaskets and union bolt.

Torque: 15 N

⋅

m (150 kgf

⋅

cm, 11 ft

⋅

lbf)

(h) Install 

the accelerator bracket with the bolt and stud bolt.

13. CONNECT HOSES

Connect the following hoses:

(1)  Water by–pass (from EGR valve) to water bypass

pipe

(2)  Vacuum hose (from brake booster) to air intake

chamber

(3)  Vacuum hose (from VSV for heater water valve) to

air intake chamber

(4)  PCV hose to LH cylinder head cover

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STARTING SYSTEM

Starter

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(5) Water by–pass hose (from water inlet housing) to ISC

valve

(6) Vacuum hose (from PS air control valve) to air intake

chamber

(7) Vacuum sensing hose (from fuel pressure regulator)

to vacuum pipe

(8) Two vacuum hoses (from VSV for EVAP system) to

vacuum pipe

(9) Vacuum hose (from charcoal canister) to vacuum

pipe.

14. CONNECT CONNECTORS

Connect 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

15.  INSTALL THROTTLE BODY

(a)  Connect the following hoses:

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

(b)  Install a new gasket and throttle body with the two bolts

and two nuts.

Torque: 18 N

⋅

m (185 kgf

⋅

cm, 13 ft

⋅

lbf)

HINT: Use bolts 40 mm (1.57 in.) in length.
(c)  Install the water by–pass pipe (from rear water bypass

joint) to the clamp on the engine wire cover.

ST–30

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STARTING SYSTEM

Starter

(d)  Connect the following hoses:

(1) Water by–pass hose to the ISC valve
(2) (USA 

Spec.)

Vacuum hose to throttle body

(3)  (Exc. USA Spec.)

Three vacuum hoses to throttle body

(4)  Heater water hose to heater water valve

(e)  Connect the following connectors:

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

TRAC)

Sub–throttle position sensor connector

(3) (w/ 

TRAC)

Sub–throttle actuator connector

16.  INSTALL LOWER HIGH–TENSION CORD COVER

(a) Connect 

the end portions of the high–tension cord to the

cord clamps

(b)  Install the high–tension cord cover with the bolt.

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STARTING SYSTEM

Starter

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