2000 LEXUS GS400 Service Repair Manual

SF0NO±05
B02816
B02692
30°(3)
(2)
B01951
Turn
(3)
(2)
± SFI (2JZ±GE)THROTTLE BODY
SF±37
1503 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REPLACEMENT
NOTICE:

To prevent deterioration, do not shock the throttle
position sensor and accelerator pedal position sen-
sor.

Mixing of the foreign objects may cause the gear lock-
ing, so thoroughly check that there is no stuck of any
foreign objects and clean up if any.
1. REPLACE THROTTLE POSITION SENSOR
(a) Remove the 2 set screws and throttle position sensor.
(b) Reinstall the throttle position sensor.
(1) Check that the throttle valve is under the condition
of the opener opening angle (about 3.5°).
(2) Install the sensor to the place where is at 30° ro-
tated to the right from the specified installation posi-
tion.
(3) Gradually turn sensor counterclockwise until it
touches the throttle valve shaft and temporarily
torque the 2 set screws.
(c) Adjust the throttle position sensor.
(1) Connect the throttle position sensor connector.
NOTICE:
At this time, do not connect the throttle control motor con-
nector.
(2) Connect the LEXUS hand±held tester or OBDII
scan tool to the DLC3.
(3) Turn the ignition switch ON.
NOTICE:
After turning the ignition switch ON, do not depress the ac-
celerator pedal.
(4) While reading the value of the throttle valve opening
percentage (THROTTLE POS) of the CURRENT
DATA, turn the throttle position sensor slowly to left
and set the sensor at the center value of the stan-
dard value, and then torque the screws.
Torque: 1.7 N´m (17.5 kgf´cm, 15 in.´lbf)
Standard throttle valve opening percentage:
14.8 ± 0.8 %

B01953
B01811
ºAº
Turn SF±38
± SFI (2JZ±GE)THROTTLE BODY
1504 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
NOTICE:
At the time of tightening the screw, as the sensor itself
tends to turn causing to slanting, check that it is within the
standard value after having finished the torque.
(5) Fully close the throttle valve with a screwdriver and
check that the value of the throttle valve opening
percentage (THROTTLE POS) of the CURRENT
DATA stays with the standard value.
Standard throttle valve opening percentage:
10 ± 14 %
If the throttle valve opening percentage is not as specified, re-
peat steps (4) through (5).
(6) Paint the sensor set screws.
(7) Turn the ignition switch OFF.
(8) Disconnect the LEXUS hand±held tester or OBDII
scan tool from the DLC3.
(9) Disconnect the throttle position sensor connector.
2. REPLACE THROTTLE CONTROL MOTOR
(a) Remove the throttle position sensor.
(b) Remove the throttle control motor.
(1) Disconnect the connector from the bracket.
(2) Remove the 5 screws, bracket and cover.
(3) Remove the 3 screws and throttle control motor.
(c) Reinstall the throttle control motor.
(1) Apply the grease thinly on the whole surface of the
gear teeth.
NOTICE:
Do not apply the grease other than specified because
grease has been already applied to the component to be re-
placed.
(2) Align the protrusions of the motor with the position-
ing pin holes of the throttle body.
(3) Rotate the motor to the direction marked with an ar-
row and temporarily install the set screw ºAº under
the condition that there is no wobbles in the motor
and the positioning pin.
(4) Tighten the 3 set screws.
Torque: 3.7 N´m (37.5 kgf´cm, 33 in.´lbf)

B01952
ºCº
ºBº
Bracket
B02943
1
Closely Affix
34
2
± SFI (2JZ±GE)THROTTLE BODY
SF±39
1505 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(5) Temporarily install the cover with the 2 screws ºBº
and ºCº.
NOTICE:
The grommet of motor not be caught.
(6) Tighten the 5 screws.
Torque: 1.7 N´m (17.5 kgf´cm, 15 in.´lbf)
(7) Connect the connector to the bracket.
(d) Reinstall and adjust the throttle position sensor. (See step
1)
3. REPLACE ACCELERATOR PEDAL POSITION SEN-
SOR
(a) Remove the accelerator pedal position sensor.
(1) Using a small screwdriver, pry the 4 stoppers of the
washer plate.
(2) Remove the 4 set bolts, washer plate and accelera-
tor pedal position sensor.
(b) Reinstall the accelerator pedal position sensor.
(1) Install the accelerator pedal position sensor to the
throttle body.
(2) Torque the 4 bolts in the order shown in the illustra-
tion through the washer plate.
Torque: 3.7 N´m (37.5 kgf´cm, 33 in.´lbf)
(3) Bend the stopper of the washer plate and closely af-
fix to the bolts.
(c) Inspect the accelerator pedal position sensor.
(1) Connect the accelerator pedal position sensor con-
nector.
(2) Connect the LEXUS hand±held tester or OBDII
scan tool to the DLC3.
(3) Turn the ignition switch ON.
NOTICE:
After turning the ignition switch ON, do not depress the ac-
celerator pedal.
(4) Check that the ACCEL POS #1 (VPA) voltage of the
CURRENT DATA shows the standard value.
Standard accelerator pedal position voltage:
0.3 ± 0.9 V
4. AFTER INSTALL THROTTLE BODY, INSPECT SYS-
TEM OPERATION (See page SF±32)

SF0NP±01
SF±40
± SFI (2JZ±GE)THROTTLE BODY
1506 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSTALLATION
Installation is in the reverse order of removal. (See page SF±36)

A02640
Ohmmeter
SF0NR±03
± SFI (2JZ±GE)CAMSHAFT TIMING OIL CONTROL VALVE
SF±41
1507 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
CAMSHAFT TIMING OIL CONTROL
VA LV E
ON±VEHICLE INSPECTION
1. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE
RESISTANCE
(a) Disconnect the oil control valve connector.
(b) Using an ohmmeter, measure the resistance between the
terminals.
Resistance: 5.5 ± 12 W at 20°C (68°F)
If the resistance is not as specified, replace the valve.
(c) Reconnect the oil control valve connector.
2. INSPECT VVT±i OPERATION
(a) Allow the engine to warm up to normal operating tempera-
ture.
(b) Check that the engine stalls or becomes in rough±idling
state when the battery positive voltage is applied to the oil
control valve with the engine idling.
If operation is not as specified, check the oil control valve (see
page SF±43), VVT±i pulley, intake camshaft, wiring and ECM.

SF0NQ±01
B01613
Oil Filler Cap
No.3 Timing Belt Cover
Camshaft Timing Oil
Control Valve Connector
O±Ring
Gasket
Camshaft Timing
Oil Control Valve

Non±reusable part SF±42
± SFI (2JZ±GE)CAMSHAFT TIMING OIL CONTROL VALVE
1508 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
COMPONENTS

A02639
SF0NS±01
B01805
Valve
21
Battery positive voltage is applied
Battery positive voltage is cut offValve moves in
Valve moves indirection
direction
± SFI (2JZ±GE)CAMSHAFT TIMING OIL CONTROL VALVE
SF±43
1509 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. REMOVE NO.3 TIMING BELT COVER
2. REMOVE CAMSHAFT TIMING OIL CONTROL VALVE
(a) Disconnect the oil control valve connector.
(b) Remove the bolt, oil control valve and O±ring.
3. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE
OPERATION
Connect positive (+) lead from the battery to terminal 1 and neg-
ative (±) lead to terminal 2, and check the movement of the
valve.
If operation is not as specified, replace the valve.
4. REINSTALL CAMSHAFT TIMING OIL CONTROL
VA LV E
(a) Install a new O±ring to the oil control valve.
(b) Install the oil control valve with the bolt.
Torque: 8.0 N´m (80 kgf´cm, 71 in.´lbf)
(c) Connect the oil control valve connector.
5. REINSTALL NO.3 TIMING BELT COVER
Torque: 8.0 N´m (80 kgf´cm, 71 in.´lbf)

SF0NT±03
B01583
ActuatorVacuum Gauge
VSV
P10710
No Vacuum
Vacuum Gauge
P10844
Approx.
33.3 kPa
Pull
Actuator
Rod Vacuum Gauge SF±44
± SFI (2JZ±GE)ACOUSTIC CONTROL INDUCTION SYSTEM (ACIS)
1510 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
ACOUSTIC CONTROL INDUCTION
SYSTEM (ACIS)
ON±VEHICLE INSPECTION
1. REMOVE ENGINE COVER
Remove the 4 nuts and engine cover.
2. CONNECT VACUUM GAUGE
Using a 3±way connector, connect vacuum gauge to the hose
between the actuator and VSV.
3. START ENGINE
4. INSPECT INTAKE AIR CONTROL VALVE
(a) While the engine is idling, check that the vacuum gauge
needle does not move.
(b) Rapidly depress the accelerator pedal to fully open posi-
tion and check that the vacuum gauge needle momentari-
ly fluctuates approx. 33.3 kPa (250 mmHg, 9.84 in.Hg) or
more. (The actuator rod is pulled down.)
5. REMOVE VACUUM GAUGE
Remove the vacuum gauge, and reconnect the vacuum hoses
to their proper locations.
6. REINSTALL ENGINE COVER
Reinstall the engine cover with the 4 nuts.