Lexus SC300 / Lexus SC400. Manual - part 604

INSTALLATION OF COLD START
INJECTOR

(See Components on page 

FI–26

)

1. 

INSTALL COLD START INJECTOR

(a)  Install a new gasket and the injector with the two bolts.

Torque: 7.8 N

⋅

m (80 kgf

⋅

cm, 69 in.

⋅

lbf)

(b)  Install the cold start injector tube with a new gasket and

the union bolt.

Torque: 15 N

⋅

m (150 kgf

⋅

cm, 11 ft

⋅

lbf)

(c)  Connect the cold start injector connector.

2. 

INSTALL AIR INTAKE CHAMBER
(a)  Place four new gaskets and the air intake chamber on

the intake manifold.

FI–35

EFI SYSTEM   –   Fuel System (Cold Start Injector)

(b) Temporarily 

install a new gasket and the EGR pipe to air

intake chamber with the two bolt.

(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.

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

chamber.

Torque: 18 N

⋅

m (185 kgf

⋅

cm, 13 ft

⋅

lbf)

(f)  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)

FI–36

EFI SYSTEM   –   Fuel System (Cold Start Injector)

(g) Install 

the accelerator bracket with the bolt and stud bolt.

3. CONNECT 

HOSES

Connect the following hoses:

(1) Water 

by–pass hose (from EGR valve) to water by–

pass 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

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

ISC valve

(6)  Vacuum hose (from PS air control valve) to air in-

take chamber

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

tor) to vacuum pipe

(8) Two 

vacuum hoses (from VSV for EVAP system) to

vacuum pipe

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

pipe

FI–37

EFI SYSTEM   –   Fuel System (Cold Start Injector)

4. 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

•

SV connector for fuel pressure control system

5. 

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.

(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

FI–38

EFI SYSTEM   –   Fuel System (Cold Start Injector)