Lexus SC300 / Lexus SC400. Manual - part 513

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

Spec.)

Vacuum hose

(4)  (Exc. USA Spec.)

Three vacuum hoses

(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 for EGR system

•

(Exc. USA Spec.)
VSV connector for EGR

•

VSV connector for fuel pressure control system

FI–30

EFI SYSTEM   –   Fuel System (Cold Start Injector)

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.

FI–31

EFI SYSTEM   –   Fuel System (Cold Start Injector)

(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 (DIAG-
NOSIS”) connector

(g)  Remove the air intake chamber assembly and four

gaskets.

17.  REMOVE COLD START INJECTOR FROM AIR INTAKE

CHAMBER
(a)  Disconnect the cold start injector connector.

FI–32

EFI SYSTEM   –   Fuel System (Cold Start Injector)

(b)  Remove the union bolt, two gasket, and cold start

injector tube.

(c)  Remove the two bolts, cold start injector and gasket.

INSPECTION OF COLD START INJECTOR

1. 

INSPECT RESISTANCE OF COLD START INJECTOR
(a)  Disconnect the cold start injector connector.
(b)  Using an ohmmeter, measure the resistance between

the terminals.

Resistance: 2–4 

If the resistance is not as specified, replace the cold start
injector.
(c)  Reconnect the cold start injector connector.

2. 

INSPECT INJECTION OF COLD START INJECTOR

CAUTION: Keep clear of sparks during the test.

(a) Install 

SST (two unions) to the injector and delivery pipe

with four new gaskets and the union bolts.

SST 09268–41045 (09268–41080)

Torque: 180 kg–cm (13 ft–lb, 18 N

⋅

m)

(b)  Connect SST (hose) to the unions.
SST 09268–41045

(c)  Connect SST (wire) to the injector.
SST 09842–30055

(d)  Put a container under the injector.

FI–33

EFI SYSTEM   –   Fuel System (Cold Start Injector)