LEXUS GS400 2000 Service Repair Manual

D01012
SST
Q08511
SST
D01009
D01008
AT±4
± AUTOMATIC TRANSMISSIONEXTENSION HOUSING OIL SEAL
1952 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
6. INSTALL EXTENSION HOUSING REAR OIL SEAL
(a) Coat the lip of a new oil seal with MP grease.
(b) Using SST and a hammer, drive in the oil seal with the lip
facing downward.
SST 09309±37010
Oil seal depth from flat end: 2.0 mm (0.079 in.)
7. INSTALL TRANSMISSION OUTPUT FLANGE
(a) Using SST and a hammer, drive in a new oil seal.
SST 09950±60010 (09951±00350), 09950±70010
(09951±07100)
(b) Install the output flange.
(c) Using a 30 mm deeper socket wrench, install and torque
a new nut.
Torque: 126 N´m (1,280 kgf´cm, 93 ft´lbf)
HINT:
Shift the shift lever to P position.
(d) Using a chisel and hammer, stake the nut.
8. INSTALL PROPELLER SHAFT
(See page PR±10)
9. INSTALL FRONT EXHAUST PIPE AND HEAT INSULA-
TOR
1UZ±FE Engine: (See page EM±120)
2JZ±GE Engine: (See page EM±97)
10. FILL AND CHECK FLUID LEVEL
(See page DI±318)

AT069±01
Q03794
AT±32
± AUTOMATIC TRANSMISSIONAUTOMATIC TRANSMISSION UNIT (2JZ±GE)
1980 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSTALLATION
1. CHECK TORQUE CONVERTER CLUTCH INSTALLA-
TION
Using calipers and a straight edge, measure from the distance
from the installed surface of the transmission housing to the
installed surface of the torque converter clutch.
Correct distance: More than 0.1 mm (0.004 in.)
If the distance is less than the standard, check for an improper
installation.
2. INSTALL TRANSMISSION
Installation is in the reverse order of removal.
(See page AT±28)
HINT:
After installation, check and inspect items as follows.

Adjust the shift lever position. (See page DI±318)

Fill ATF and check fluid level. (See page DI±318)

Do the road test. (See page DI±318)

AT06A±01
D01049
Oil Cooler Pipe
Connector and Wire Harness
Level Gauge
Torque Converter Clutch
Flywheel Housing
Under CoverPlug for Line
Pressure Test
Front and Center Exhaust PipePropeller Shaft Assembly
Heated Oxygen Sensor
Pipe Support BracketRH Front TWC
Engine Under CoverHeat Insulator
Ground CableHeat Insulator
GasketO±Ring x6Adjusting Washer
Filler Pipe
44 (450, 33)
79 (805, 58)
37 (375, 27)
79 (805, 58)
13 (130, 9)
37 (380, 27)
18 (185, 13)
44 (450, 33)
44 (450, 33)
62 (630, 46)
62 (630, 46)
72 (730, 53)
37 (380, 27)
48 (490, 35)
44 (450, 33)44 (450, 33)
5.4 (55, 48 in.´lbf)
5.4 (55, 48 in.´lbf)
Heat Insulator
26 (270, 20)

Gasket
LH Front TWC
44 (450, 33)

Gasket

Gasket


















N´m (kgf´cm, ft´lbf) : Specified torque
Non±reusable part
Heat Insulator
5.4 (55, 48 in.´lbf)
44 (450, 33)
44 (450, 33)

O±Ring
Heated Oxygen
SensorFront Floor
Center Brace
7.4 (75, 65 in.´lbf)
x6
± AUTOMATIC TRANSMISSIONAUTOMATIC TRANSMISSION UNIT (1UZ±FE)
AT±33
1981 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
AUTOMATIC TRANSMISSION UNIT (1UZ±FE)
COMPONENTS

AT06B±01
D01050
D01051
D00999
AT±34
± AUTOMATIC TRANSMISSIONAUTOMATIC TRANSMISSION UNIT (1UZ±FE)
1982 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
1. REMOVE LEVEL GAUGE
2. RAISE VEHICLE
NOTICE:
Make sure that the vehicle is securely supported.
3. REMOVE ENGINE UNDER COVER
4. REMOVE FRONT AND CENTER EXHAUST PIPES
(a) Disconnect he 2 heated oxygen sensor.
Torque: 44 N´m (450 kgf´cm, 33 ft´lbf)
HINT:
At the time of installation, please refer to the following items.

Before installing the heated oxygen sensor, twist the sen-
sor wire counterclockwise 3 and 1/2 turns.

After installing the heated oxygen sensor wire should not
twist. If it is twisted, remove the heated oxygen sensor
and reinstall it.
(b) Remove the 2 bolts and front floor center brace.
Torque: 7.4 N´m (75 kgf´cm, 65 in.´lbf)
(c) Remove the 4 bolts, nuts and 2 gaskets from the LH and
RH front TWC.
Torque: 44 N´m (450 kgf´cm, 33 ft´lbf)
HINT:
At the time of installation, please refer to the following item.
Replace the used nuts and gaskets with new ones.
(d) Remove the 2 bolts and support bracket.
Torque: 44 N´m (450 kgf´cm, 33 ft´lbf)
(e) Remove the 4 bolts and 2 gaskets from the tail pipe.
Torque: 44 N´m (450 kgf´cm, 33 ft´lbf)
HINT:
At the time of installation, please refer to the following item.
Replace the used gaskets with new ones.
(f) Disconnect the front and center exhaust pipes from the 2
O±rings and remove them.
5. REMOVE LH AND RH FRONT TWC
Remove the 6 nuts, 2 gaskets, LH and RH front TWC.
Torque: 62 N´m (630 kgf´cm, 46 ft´lbf)
HINT:
At the time of installation, please refer to the following item.
Replace the used nuts and gaskets with new ones.

D01052
D01044
D01002
D01053
D01004
± AUTOMATIC TRANSMISSIONAUTOMATIC TRANSMISSION UNIT (1UZ±FE)
AT±35
1983 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
6. REMOVE HEAT INSULATOR
Remove the 2 nuts, 3 bolts and 2 heat insulators.
7. REMOVE BOLT AND FILLER PIPE
HINT:
At the time of installation, please refer to the following item.
Replace the used O±ring with a new one.
8. REMOVE PROPELLER SHAFT
(See page PR±4)
9. DISCONNECT SHIFT CONTROL ROD
Remove the nut and disconnect the rod.
Torque: 13 N´m (130 kgf´cm, 9 ft´lbf)
10. DISCONNECT OIL COOLER PIPE
(a) Loosen the 2 union nuts from the transmission.
Torque: 44 N´m (450 kgf´cm, 33 ft´lbf)
NOTICE:
Be careful not to damage the oil cooler pipe.
(b) Disconnect the 3 set bolts of the clamp.
Torque: 5.4 N´m (55 kgf´cm, 48 in.´lbf)
(c) Disconnect the 2 oil cooler pipes from the transmission.
11. REMOVE TORQUE CONVERTER CLUTCH MOUNT-
ING BOLT
(a) Remove the 2 bolts and flywheel housing under cover.
Torque: 18 N´m (185 kgf´cm, 13 ft´lbf)

D01005
Q03721
D01048
Q06925
AT±36
± AUTOMATIC TRANSMISSIONAUTOMATIC TRANSMISSION UNIT (1UZ±FE)
1984 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(b) Turn the crankshaft to gain access to each bolt.
(c) Hold the crankshaft pulley nut with a wrench and remove
the 6 bolts.
Torque: 48 N´m (490 kgf´cm, 35 ft´lbf)
HINT:
At the time of installation, please refer to the following item.
First install the black colored bolt and then the 5 other bolts.
12. SUPPORT TRANSMISSION WITH JACK
13. REMOVE 4 ENGINE REAR MOUNTING SET BOLTS
Torque: 26 N´m (270 kgf´cm, 20 ft´lbf)
14. DISCONNECT CONNECTORS AND WIRE HARNESS
(a) Tilt down the transmission.
NOTICE:
Take care so that the cooling fan does not come in contact
with the fan shroud.
(b) Disconnect the following connectors:
(1) O/D direct clutch speed sensor connector
(2) Vehicle speed sensor connector
(3) Park/neutral position switch connector
(4) Solenoid connector
(c) Disconnect the wire harness from the clamp on the trans-
mission.

Q03099
17 mm
Head
14 mm Head17 mm Head
Q06924
± AUTOMATIC TRANSMISSIONAUTOMATIC TRANSMISSION UNIT (1UZ±FE)
AT±37
1985 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
15. REMOVE TRANSMISSION
Remove the 10 bolts and transmission.
Torque:
17 mm head: 72 N´m (730 kgf´cm, 53 ft´lbf)
14 mm head: 37 N´m (380 kgf´cm, 27 ft´lbf)
HINT:
At the time of installation, please refer to the following item.
Lift the front side of the engine.

AT06C±01
D01007
AT±38
± AUTOMATIC TRANSMISSIONAUTOMATIC TRANSMISSION UNIT (1UZ±FE)
1986 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSTALLATION
1. CHECK TORQUE CONVERTER CLUTCH INSTALLA-
TION
Using calipers and a straight edge, measure the distance from
the installed surface of the transmission housing to the installed
surface of the torque converter clutch.
Correct distance: More than 17.1 mm (0.673 in.)
If the distance is less than the standard, check for an improper
installation.
2. INSTALL TRANSMISSION
Installation is in the reverse order of removal.
(See page AT±34)
HINT:
After installation, check and inspect items as follows.

Adjust the shift lever position. (See page DI±318)

Fill ATF and check fluid level. (See page DI±318)

Do the road test. (See page DI±318)

AT5436
SST
AT06D±01
AT5437
Lock
Free
Q03546
AT4184
± AUTOMATIC TRANSMISSIONTORQUE CONVERTER CLUTCH AND DRIVE PLATE
AT±39
1987 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
TORQUE CONVERTER CLUTCH
AND DRIVE PLATE
INSPECTION
1. INSPECT ONE±WAY CLUTCH
(a) Install SST so that it fits in the notch of the converter hub
and outer race of the one±way clutch.
SST 09350±30020 (09351±32020)
(b) Press on the serrations of stater with a finger and rotate
it.
Check if it rotates smoothly when turned clockwise and
locks up when turned counterclockwise.
2. MEASURE DRIVE PLATE RUNOUT AND INSPECT
RING GEAR
Set up a dial indicator and measure the drive plate runout.
Maximum runout: 0.20 mm (0.0079 in.)
If runout exceeds 0.20 mm (0.0079 in.) or if the ring gear is dam-
aged, replace the drive plate. If installing a new drive plate, note
the orientation of spacers and tighten the bolts.
Torque: 83 N´m (850 kgf´cm, 61 ft´lbf)
3. MEASURE TORQUE CONVERTER CLUTCH SLEEVE
RUNOUT
(a) Temporarily mount the torque converter clutch to the drive
plate. Set up a dial indictor.
Maximum runout: 0.30 mm (0.0118 in.)
If runout exceeds 0.30 mm (0.0118 in.), try to correct by reori-
enting the installation of the torque converter clutch.
If excessive runout cannot be corrected, replace the torque
converter clutch.
HINT:
Mark the position of the torque converter clutch to ensure cor-
rect installation.
(b) Remove the torque converter clutch.

AT05Y±01
D00910
Q07487
SST
AT0103
± AUTOMATIC TRANSMISSIONATF TEMPERATURE SENSOR
AT±5
1953 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
ATF TEMPERATURE SENSOR
ON±VEHICLE REPAIR
CAUTION:
When working with FIPG material, you must observe the follow-
ing items.

Using a razor blade and gasket scraper, remove all the old
FIPG material from the gasket surfaces.

Thoroughly clean all components to remove all the loose
material.

Clean both sealing surfaces with a non±residue solvent.

Apply FIPG in an approx. 1 mm (0.04 in.) wide bead along
the sealing surface.

Parts must be assembled within 10 minutes of application.
Otherwise, the FIPG material must be removed and reap-
plied.
1. REMOVE DRAIN PLUG WITH GASKET AND DRAIN
AT F
2. REMOVE OIL PAN
NOTICE:
Some fluid will remain in the oil pan.
(a) Remove the 19 bolts.
(b) Install the blade of SST between the transmission case
and oil pan, cut off applied sealer, and remove the oil pan.
SST 09032±00100
NOTICE:
When removing the oil pan, be careful not to damage the oil
pan flange.
3. EXAMINE PARTICLES IN PAN
Remove the magnets and use them to collect steel particles.
Carefully look at the foreign matter and particles in the pan and
on the magnets to anticipate the type of wear you will find in the
transmission.
Steel (magnetic) ... bearing, gear and clutch plate wear
Brass (non±magnetic) ... bushing wear