Lexus SC300 / Lexus SC400. Service manual - part 514

(e)  Using SST, connect terminals +B and FP of the check

(”DIAGNOSIS”) connector.

SST 09843–18020
(f)  Reconnect the cable to the negative (–) terminal of the

battery.

(g)  Turn the ignition switch ON.
NOTICE: Do not start the engine.

(h)  Connect the test probes of the SST (wire) to the battery,

and check that the fuel spray is as shown.

SST 09842–30055
NOTICE: Perform this check within the shortest possible
time.

3. INSPECT 

LEAKAGE

(a)  In the condition above, disconnect the test probes of

SST (wire) from the battery and check fuel leakage from
the injector.

SST 09842–30055

Fuel drop: One drop or less per minute

(b)  Disconnect the cable from the negative (–) terminal of

the battery.

(c) Remove 

SST.

SST 09268–41045, 09842–30050 and 09843–18020

FI–34

EFI SYSTEM   –   Fuel System (Cold Start Injector)

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)