Lexus SC300 / Lexus SC400. Manual — part 566

11. (USA

Spec.)

REMOVE EGR VALVE
(a) Disconnect the EGR valve connector.
(b) Disconnect the following hoses:

(1)

Water by–pass pipe hose from ISC valve

(2)

Water by–pass hose from water by–pass pipe
(from rear water by–pass joint)

(c) Remove the two nuts, EGR valve and gasket.

12. (Exc. USA Spec.)

REMOVE EGR VALVE AND VACUUM MODULATOR
(a) Disconnect the hose clamp (A) from the PCV hose.
(b) Disconnect the following hoses:

(1)

Water by–pass pipe hose from ISC valve

(2)

Water by–pass hose from water by–pass pipe
(from rear water by–pass joint)

(3)

Two vacuum hoses from VSV for EGR system

(c) Remove the bolt, two nuts, the EGR valve, vacuum

modulator assembly and gasket.

13. REMOVE EGR VALVE ADAPTOR

(a) Disconnect the PCV hose from the cylinder head.

–

ENGINE MECHANICAL

Cylinder Heads

EM–63

(b) Remove the two bolts, two nuts, adaptor and gasket.
(c) (USA Spec. only)

Disconnect the EGR gas temperature sensor connec-
tor.

14. REMOVE ISC VALVE

(a) Disconnect the ISC valve connector.
(b) Disconnect the water by–pass hose from the ISC valve.

(c) Remove the two nuts, ISC valve and gasket.

15. DISCONNECT HEATER WATER VALVE FROM BODY

(a) Disconnect the VSV connector.
(b) Remove the bolt holding the engine wire clamp to the

water valve bracket.

(c) Remove the two bolts, and disconnect the water valve

and bracket assembly.

16. REMOVE THROTTLE BODY

(a) Disconnect the following connectors:

(1)

Throttle position sensor connector

(2)

(w/ TRAC)
Sub–throttle position sensor connector

(3)

(w/ TRAC)
Sub–throttle actuator connector

EM–64

–

ENGINE MECHANICAL

Cylinder Heads

(b) Remove the two mounting bolts and two mounting nuts,

and disconnect the throttle body from the air intake
chamber.

(c) Disconnect the following hoses, and remove the throttle

body:

(1)

PCV hose from throttle body

(2)

Water by–pass hose from throttle body

(d) Remove the throttle body gasket.

17. DISCONNECT

VACUUM

HOSES

Disconnect the following hoses:

(1)

Vacuum hose from brake booster union

(2)

Vacuum hose (from VSV for heater water valve)
from air intake chamber

18. REMOVE

ACCELERATOR

BRACKET

Remove the bolt, stud bolt and bracket.

19. REMOVE BRAKE BOOSTER UNION

Remove the union bolt, union and two gaskets.

20. REMOVE AIR INTAKE CHAMBER

(a) Disconnect the following connectors:

•

Cold start injector connector

•

VSV connector for fuel pressure control system

•

(Exc. USA Spec.)

VSV connector for EGR system

(b) Remove

the union bolt and two gaskets, and disconnect

the cold start injector tube from the RH delivery pipe.

–

ENGINE MECHANICAL

Cylinder Heads

EM–65

(c) Remove the two bolts and gaskets, and disconnect the

EGR pipe from the air intake chamber.

(d) Remove the four mounting bolts, eight mounting nuts

and following parts:

(1)

VSV for fuel pressure control system

(2)

(Exc. USA Spec.)
VSV for EGR system

(3)

A/T throttle cable bracket

(e) Disconnect the check (”DIAGNOSIS”) connector from

the intake chamber.

(f) Remove the air intake chamber and four gaskets.

(g) Remove

the three bolts, the cold start injector, tube, lead

wire assembly and gasket.

21. DISCONNECT

HEATER

WATER

HOSES

Disconnect the following hoses:

(1)

Water hose from water by–pass pipe

(2)

Water hose from rear water by–pass joint

22. DISCONNECT FUEL INLET HOSE FROM LH DELIVERY

PIPE
Remove the pulsation damper and two gaskets, and discon-
nect the inlet hose.

23. DISCONNECT FUEL RETURN HOSE FROM FUEL

RETURN PIPE

EM–66

–

ENGINE MECHANICAL

Cylinder Heads