Lexus SC300 / Lexus SC400. Manual - part 473

(b)  Remove the six nuts and five bolts holding the intake air

connector to the air intake chamber.

(c)  Disconnect the check connector and harness protector

from the air intake chamber.

(d)  Remove the five bolts, two nuts, intake air chamber and

two gaskets.

INSPECTION OF ACOUSTIC CONTROL
INDUCTION SYSTEM (ACIS)

1. INSPECT 

IACV

(a)  With 53.3 kPa (400 mmHg, 15.75 in.Hg) of vacuum

applied to the actuator, check that the actuator rod
moves.

(b)  One minute after applying the vacuum in (a), check that

the actuator rod does not return.

If the operation is not as specified, turn the adjusting screw.

2. INSPECT 

VACUUM 

TANK

(a)  Check that air flows from port A to port B.
(b)  Check that air does not flow port B to port A.

(c)  Plug port B with your finger, and apply 53.3 kPa (400

mmHg, 15.75 in.Hg) of vacuum to port A, and check that
there is no changer in vacuum after one minute.

If the operation is not as specified, replace the vacuum tank.

–

EFI SYSTEM

FI–59

Air Induction System (Acoustic Control Induction System (ACIS)

3. INSPECT 

VSV

A.

Inspect VSV for open circuit
Using an ohmmeter, check that there is continuity, between
the terminals.

Resistance (Cold):     38.5–44.5 

 at 20

°

C (68

°

F)

If there is no continuity, replace the VSV.

B.

Inspect VSV for ground
Using an ohmmeter, check that there is no continuity be-
tween each terminal and the body.
If there is continuity, replace the VSV.

C.

Inspect VSV operation
(a)  Check that air flows from port E to the filter.

(b)  Apply battery voltage across the terminals.
(c)  Check that air flows from port E to port F.
If operation is not as specified, replace the VSV.

FI–60

–

EFI SYSTEM

Air Induction System (Acoustic Control Induction System (ACIS)

INSTALLATION OF ACOUSTIC CONTROL
INDUCTION SYSTEM

(See Components on page 

FI–57

)

1. 

INSTALL AIR INTAKE CHAMBER
(a)  Place a new gasket so the protrusion faces the intake

chamber.

(b)  Install a new gasket to the intake manifold, and the

intake chamber with the five bolts and two nuts.

Torque:     21 N

⋅

m (210 kgf

⋅

cm, 15 ft

⋅

lbf)

(c)  Connect the check connector and harness protector

with the two bolts to the air intake chamber.

(d)  Install the six nuts and five bolts holding the intake air

connector to the air intake chamber.

Torque:     18 N

⋅

m (185 kgf

⋅

cm, 13 ft

⋅

lbf)

(e)  Connect the following hoses:

(1) Vacuum hose to brake booster union
(2) Air hose (to charcoal canister)
(3) Vacuum hose from vacuum pipe
(4) Vacuum sensing hose
(5) Air hose (to PS air control valve)

2. 

INSTALL EGR PIPE
(a)  Install a gasket and the EGR pipe with the two bolts.

Torque:     21 N

⋅

m (210 kgf

⋅

cm, 15 ft

⋅

lbf)

(b)  Tighten the union nut.

Torque:     64 N

⋅

m (650 kgf

⋅

cm, 47 ft

⋅

lbf)

–

EFI SYSTEM

FI–61

Air Induction System (Acoustic Control Induction System (ACIS)

3. 

INSTALL NO.2 VACUUM PIPE
Install the vacuum pipe with the two nuts.

Torque:     21 N

⋅

m (210 kgf

⋅

cm, 15 ft

⋅

lbf)

4. 

INSTALL OIL DIPSTICK FOR ENGINE

5. 

INSTALL VACUUM TANK AND VSV
(a)  Install the VSV with the screw on the vacuum tank.

Torque:     8.8 N

⋅

m (90 kgf

⋅

cm, 78 in.

⋅

lbf)

(b)  Install the vacuum hose.

6. 

INSTALL VACUUM CONTROL VALVE SET
(a)  Install the vacuum control valve set with the two nuts.

Torque:     21 N

⋅

m (210 kgf

⋅

cm, 15 ft

⋅

lbf)

(b)  Connect the following hoses:

(1) Vacuum hose to VSV
(2) Vacuum hose to vacuum pipe

(c)  Connect the connector to the VSV.

7. (A/T)

INSTALL DIPSTICK GUIDE FOR TRANSMISSION
(a)  Install a new O–ring on the dipstick guide.
(b)  Apply soapy on the O–ring.
(c)  Connect the dipstick guide end to the tube of the oil pan,

and install the dipstick guide with the bolt.

(d)  Install the dipstick.

8.  CONNECT CABLE TO NEGATIVE TERMINAL OF

BATTERY

FI–62

–

EFI SYSTEM

Air Induction System (Acoustic Control Induction System (ACIS)