2000 LEXUS GS400 Service Repair Manual

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

D00752
D00753
D00909
D00916
D00909
AT±6
± AUTOMATIC TRANSMISSIONATF TEMPERATURE SENSOR
1954 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
4. REMOVE OIL STRAINER
NOTICE:
Be careful as some fluid will come out of the oil strainer.
(a) Remove the 4 bolts and oil strainer.
(b) Remove the 3 gaskets from the oil strainer.
5. REMOVE SOLENOID WIRING WITH ATF TEMPERA-
TURE SENSOR
(a) Disconnect the ATF temperature sensor.
(b) Remove the bolt and clamp.
(c) Disconnect the 7 connectors from the solenoid valves.
(d) Remove the bolt and pull out the solenoid connector.
6. INSTALL SOLENOID WIRING WITH ATF TEMPERA-
TURE SENSOR
(a) Install the solenoid connector with the bolt.
Torque: 5.4 N´m (55 kgf´cm, 48 in.´lbf)
(b) Connect the 7 connectors to the solenoid valves.
(c) Install the clamp with the bolt.
Torque: 6.4 N´m (65 kgf´cm, 56 in.´lbf)
(d) Connect the ATF temperature sensor.

D00753
D00752
D00912
D01917
Seal Breadth 2 ~ 3 mm (0.08 ~ 0.12 in.)
D00910
ºAº
± AUTOMATIC TRANSMISSIONATF TEMPERATURE SENSOR
AT±7
1955 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
7. INSTALL OIL STRAINER
(a) Install 3 new gaskets.
(b) Install the oil strainer with the 4 bolts.
Torque: 10 N´m (100 kgf´cm, 7 ft´lbf)
8. INSTALL OIL PAN
(a) Install the 3 magnets in the indications of the oil pan.
(b) Remove any packing material and be careful not to drop
oil on the contacting surfaces of the transmission case
and oil pan.
(c) Apply FIPG to the oil pan.
FIPG:
Part No. 08826 ± 00090, THREE BOND 1281 or
equivalent
(d) Install the oil pan with the 19 bolts.
Torque: 7.4 N´m (75 kgf´cm, 65 in.´lbf)
HINT:
Replace the only ºAº bolt with a new one.
9. INSTALL DRAIN PLUG WITH NEW GASKET
Torque: 20 N´m (205 kgf´cm, 15 ft´lbf)
10. FILL FLUID AND CHECK FLUID
(See page DI±318)

AT05Z±01
D00754
D01741
Spring Check Ball Body AT±8
± AUTOMATIC TRANSMISSIONVALVE BODY ASSEMBLY
1956 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
VALVE BODY ASSEMBLY
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 (See page AT±5)
3. EXAMINE PARTICLES IN PAN (See page AT±5)
4. REMOVE OIL STRAINER (See page AT±5)
5. REMOVE SOLENOID WIRING WITH ATF TEMPERA-
TURE SENSOR (See page AT±5)
6. REMOVE VALVE BODY
Remove the 21 bolts and valve body.
7. REMOVE CHECK BALL BODY AND SPRING
NOTICE:
Do not drop the check ball body and spring.

D00911
Shift Solenoid
Valve SLN
Shift Solenoid
Valve SLTShift Solenoid
Valve S1 Shift Solenoid
Valve S3
Shift Solenoid
Valve SLU
Shift Solenoid Valve S2 Shift Solenoid Valve S4
D01741
Spring Check Ball Body
D00913
Pin
± AUTOMATIC TRANSMISSIONVALVE BODY ASSEMBLY
AT±9
1957 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
8. REMOVE SOLENOID VALVE
(a) Remove the 3 bolts and shift solenoid valve No.1, No.2
and No.3.
(b) Remove the 2 bolts, oil guide plate, lock plate, shift sole-
noid valve SLN and No.4.
(c) Remove the 6 O±rings from each shift solenoid valve.
(d) Remove the bolt, lock plate and shift solenoid valve SLU
and SLT.
9. INSTALL SOLENOID VALVE
(a) Install the shift solenoid valve SLU and SLT and the lock
plate with the bolt.
Torque: 6.4 N´m (65 kgf´cm, 56 in.´lbf)
(b) Coat 6 new O±rings with ATF.
(c) Install the 6 O±rings to the each solenoid valve.
(d) Install the shift solenoid valve SLN, No.4, lock plate and
oil guide plate with the 2 bolts.
Torque: 10 N´m (100 kgf´cm, 7 ft´lbf)
(e) Install the shift solenoid valve No.1, No.2 and No.3 with
the 3 bolts.
Torque:
Shift solenoid valve No.1 and No.3:
6.4 N´m (65 kgf´cm, 56 in.´lbf)
Shift solenoid valve No.2:
10 N´m (100 kgf´cm, 7 ft´lbf)
10. INSTALL CHECK BALL BODY AND SPRING
11. INSTALL VALVE BODY
(a) Align the groove of the manual valve to pin of the lever.

D00754
A
CB
B
B
B
C
CA
DB
AT±10
± AUTOMATIC TRANSMISSIONVALVE BODY ASSEMBLY
1958 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(b) Install the 21 bolts.
Torque: 10 N´m (100 kgf´cm, 7 ft´lbf)
Bolt length:
Bolt A: 23 mm (0.91 in.)
Bolt B: 28 mm (1.10 in.)
Bolt C: 36 mm (1.42 in.)
Bolt D: 55 mm (2.17 in.)
12. INSTALL SOLENOID WIRING WITH ATF TEMPERA-
TURE SENSOR (See page AT±5)
13. INSTALL OIL STRAINER (See page AT±5)
14. INSTALL OIL PAN (See page AT±5)
15. INSTALL DRAIN PLUG WITH NEW GASKET
Torque: 20 N´m (205 kgf´cm, 15 ft´lbf)
16. FILL FLUID AND CHECK FLUID (See page DI±318)

BE01I±09
± BODY ELECTRICALBODY ELECTRICAL SYSTEM
BE±1
2302 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
BODY ELECTRICAL SYSTEM
PRECAUTION
HINT:
Take care to observe the following precautions when performing inspections or removal and replacement
of body electrical related parts.
1. HEADLIGHT SYSTEM

Halogen bulbs have pressurized gas inside and require special handling. They can burst if scratched
or dropped. Hold a bulb only by its plastic or metal case. Don't touch the glass part of a bulb with bare
hands.

When high voltage socket of discharge headlight is touched with the light control switch HEAD, high
voltage of 20,000 V is momentarily generated. This might lead to a serious accident.

Never connect the tester to the high voltage socket of discharge headlight for measurement, as this
leads to a serious accident because of high voltage.

When performing operation related to the discharge headlight, make sure to do it in the place with no
water of rain to prevent electric shock, with light control switch OFF, battery terminal removed, connec-
tor of light control ECU disconnected.

When performing operation related to the discharge headlight, make sure to do it after assembling has
been completely over and never light up without a bulb installed.

Do not light up the discharge headlight using another power source except vehicle's.

When there is a defect on the discharge headlight or any shock has been applied to it, replace the light
with a new one.
Even if the light operates normally, there is a possibility that the fail±safe function works.
2. SRS (SUPPLEMENTAL RESTRAINT SYSTEM)
The LEXUS GS300/ 400 is equipped with an SRS (Supplemental Restraint System) such as the driver airbag
and front passenger airbag. Failure to carry out service operation in the correct sequence could cause the
SRS to unexpectedly deploy during servicing, possibly leading to a serious accident. Before servicing (in-
cluding removal or installation of parts, inspection or replacement), be sure to read the precautionary notices
in the RS section.
3. COMBINATION METER SYSTEM
The cold cathode tube connectors (Connector ºKºand ºLº) in the combination meter are charged with high
voltage AC current when power is supplied, so do not touch them when they are charged.