Lexus SC300 / Lexus SC400. Service manual - part 515

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)

(4) Heater water hose to heater water valve

(e)  Connect the following connectors:

(1)

Throttle position sensor connector

(2)

(w/ TRAC)
Sub–throttle position sensor connector

(3)

(w/ TRAC)
Sub–throttle actuator connector

5. 

INSTALL LOWER HIGH–TENSION CORD COVER
(a) Connect 

the end portions of the high–tension cord to the

cord clamps

(b)  Install the high–tension cord cover with the bolt.

(c)  Install the clamps on the high–tension cords to the

high–tension cord cover.

(d)  Connect the high–tension cord to the RH ignition coil.

7. 

INSTALL RH NO.3 TIMING BELT COVER
(a)  Install the three gaskets to the timing belt cover.
(b)  Fit portion A of the timing belt cover, matching it with the

lower high–tension cord cover.

(c)  Install the timing belt cover with the three bolts.

FI–39

EFI SYSTEM   –   Fuel System (Cold Start Injector)

8. 

INSTALL VSV FOR EVAP SYSTEM
Install the VSV with the two bolts.

9. 

INSTALL LH NO.3 TIMING BELT COVER
(a)  Install the three gaskets to the timing belt cover.
(b)  Install the cord grommet to the high–tension cord.
(c)  Install the cord grommet to the timing belt cover.
(d)  Fit portion A of the timing belt cover, matching it with the

lower high–tension cord cover.

(e)  Install the timing belt cover with the four bolts.

10.  INSTALL RH ENGINE WIRE COVER

(a)  Fit portions A and B of the engine wire cover, matching

them with the lower high–tension cord cover and No.3
timing belt cover.

(d)  Install the engine wire cover with the bolt.

11.  INSTALL LH ENGINE WIRE COVER

(a)  Connect portions A and B engine wire cover to the wire

brackets.

(b)  Set the VSV (for fuel pressure control system) wire in

original position.

(c)  Fit portions C and D of the engine wire cover, matching

them with the lower high–tension cord cover and No.3
timing belt cover.

(d)  Install the engine wire cover with the two bolts.

12.  INSTALL UPPER HIGH–TENSION CORD COVER

(a)  Fit portion A of the upper high–tension cover, matching

it with the top of the lower high–tension cord cover.

FI–40

EFI SYSTEM   –   Fuel System (Cold Start Injector)

(b)  Push the front side of the high–tension cord cover, and

connect the front side claw groove of the upper
high–tension cord cover to the claw of the lower
high–tension cord cover.

(c)  Install the upper high–tension cord cover with the two

bolts.

13.  INSTALL INTAKE AIR CONNECTOR

(a)  Connect the end portions of the intake air connector to

the throttle body and air cleaner hose.

(b)  Tighten the two hose clamps.
(c)  Install the bolt holding the intake air connector to the

cylinder head cover.

(d)  Connect the following hoses:

(1)

Air hose to ISC valve

(2)

Air hose (from PS air control valve) to intake air con-
nector

14.  CONNECT CONTROL CABLES TO THROTTLE BODY

Connect the following cables:

(1)

Accelerator cable

(2)

A/T throttle control cable

(3)

(w/ Cruise Control System)
Cruise control actuator cable

15.  INSTALL THROTTLE BODY COVER

Install the throttle body cover and hose clamp with the two
bolts and cap nut.

16.  CONNECT CABLE TO NEGATIVE TERMINAL OF

BATTERY

17.  FILL WITH ENGINE COOLANT (See page 

CO–7

)

18.  CHECK FOR FUEL LEAKS (See page 

FI–16

)

FI–41

EFI SYSTEM   –   Fuel System (Cold Start Injector)