Lexus SC300 / Lexus SC400. Manual — part 614
C. Inspect
sub–throttle
valve
Check that there is no clearance between the throttle stop
screw and throttle valve gear when the sub–throttle valve is
fully closed.
D. Inspect sub–throttle position sensor
(a) Insert
a
0.30 mm (0.012 in.) or 0.50 mm (0.020 in.) feeler
gauge between the throttle stop screw and throttle valve
gear.
(b) Using an ohmmeter, measure the resistance between
each terminal.
Clearance between
lever and stop screw
Between terminals
Resistance
0 mm (0 in.)
VTA2–E2
0.2–0.8
0.30 mm (0.012 in.)
IDL2–E2
2.3 k
or less
0.50 mm (0.020 in.)
IDL2–E2
Infinity
Throttle valve fully
open
VTA2–E2
3.3–10.0 k
–
VC–E2
4.0–9.0 k
E.
If necessary, adjust sub–throttle position sensor
(a) Loosen the two set screws of the sensor.
(b) Insert a 0.30 mm (0.012 in.) feeler gauge, between the
throttle stop screw and throttle valve gear.
(c) Connect the test probe of an ohmmeter to the terminals
IDL2 and E2 of the sensor.
FI–75
EFI SYSTEM – Air Induction System (Throttle Body)
(d) Gradually turn the sensor clockwise until the ohmmeter
deflects, and secure it with the two set screws.
(e) Recheck the continuity between terminals IDL2 and E2.
Clearance between
lever and stop screw
Continuity (IDL2–E2)
0.30 mm (0.012 in.)
Continuity
0.50 mm (0.020 in.)
No continuity
E. Reinstall sub–throttle actuator
Install the sub–throttle actuator with the three screws.
FI–76
EFI SYSTEM – Air Induction System (Throttle Body)
INSTALLATION OF THROTTLE BODY
(See Components o page
1.
INSTALL THROTTLE BODY
(a) Install the two water by–pass hoses and pipe to the
throttle body.
(b) Connect the following hoses:
(1) PCV hose to throttle body
(2) Water by–pass hose to throttle body
(c) 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.
(d) Install the water by–pass pipe (from rear water by–pass
joint) to the clamp on the engine wire cover.
(e) 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–77
EFI SYSTEM – Air Induction System (Throttle Body)
(4) Heater water hose to heater water valve
(f) Connect the following connectors:
(1) Throttle position sensor connector
(2) (w/
TRAC)
Sub–throttle position sensor connector
(3) (w/
TRAC)
Sub–throttle actuator connector
2.
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.
(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.
3.
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.
FI–78
EFI SYSTEM – Air Induction System (Throttle Body)
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