Lexus SC300 / Lexus SC400. Manual - part 471

4.  INSTALL ENGINE WIRE TO DELIVERY PIPES, REAR

WATER BY–PASS JOINT AND RH CYLINDER HEAD
(a)  Connect the eight injector connectors.
(b) Connect the two engine wire connectors to the

connector bracket on the LH delivery pipe.

(c)  Install the engine wire to the RH cylinder head with the

two bolts.

(d)  Install the engine wire to the rear water by–pass joint

with the two bolts.

(e)  Install the engine wire to the delivery pipes with the four

bolts.

5. 

INSTALL ENGINE WIRE TO INTAKE MANIFOLD
Install the engine wire with the two bolts.

6.  TEMPORARILY INSTALL EGR PIPE TO RH CYLINDER

HEAD
Temporarily Install the EGR pipe with the bolt.

FI–56

EFI SYSTEM   –   Fuel System (Injectors)

7. CONNECT 

FUEL RETURN HOSE TO FUEL RETURN PIPE

8. 

CONNECT FUEL INLET HOSE TO LH DELIVERY PIPE
Using SST, connect the inlet hose with two new gaskets and
pulsation damper.
SST 09612–24014 (09617–24011)

Torque: 39 N

⋅

m (400 kgf

⋅

cm, 29 ft

⋅

lbf)

33 N

⋅

m (340 kgf

⋅

cm, 24 ft

⋅

lbf) for SST

HINT: Use a torque wrench with a fulcrum length of 30 cm
(11.81 in.).

9. 

INSTALL AIR INTAKE CHAMBER
(See steps 2 to 18 on pages 

FI–35

 to 41)

HINT: After the air intake chamber installed, tighten the bolt
holding to the EGR pipe to the RH cylinder head.

FI–57

EFI SYSTEM   –   Fuel System (Injectors)

Idle Speed Control (ISC) Valve

ON–VEHICLE INSPECTION

INSPECT ISC VALVE FOR OPERATING SOUND

Check that there is a clicking sound immediately after stop-
ping the engine.
If the rpm operation is not as specified, check the ISC valve,
wiring and ECU.

–

EFI SYSTEM

Air Induction System (Idle Speed Control (ISC) Valve)

FI–53

COMPONENTS

REMOVAL OF ISC VALVE

1. 

REMOVE THROTTLE BODY (See page 

FI–45

)

2. 

REMOVE ISC VALVE
Remove the two screws, ISC valve and O–ring.

INSPECTION OF ISC VALVE

1. 

INSPECT ISC VALVE RESISTANCE
Using an ohmmeter, measure the resistance between the ter-
minals (B1–S1 and S3, B2–S2 and S4).

Resistance:     10–30 

If resistance is not as specified, replace the ISC valve.

FI–54

–

EFI SYSTEM

Air Induction System (Idle Speed Control (ISC) Valve)