Lexus SC300 / Lexus SC400. Manual - part 603

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)

(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)