Lexus LS400 (2000 year). Service manual — part 3

Q06925

Q03099

17 mm Head
Bolt

14 mm Head Bolt

17 mm Head Bolt

Q06924

AT–20

–

AUTOMATIC TRANSMISSION

AUTOMATIC TRANSMISSION UNIT

1527

17.

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 transmis-
sion.

18.

REMOVE TRANSMISSION

Remove the 10 bolts and transmission.

Torque:
14 mm head bolt: 37 N·m (380 kgf·cm, 27 ft·lbf)
17 mm head bolt: 72 N·m (730 kgf·cm, 53 ft·lbf)

HINT:
At the time of installation, please refer to the following item.
Lift the engine front side.

AT034–01

D01264

O/D Brake (B

0

)

O/D One–way
Clutch (F

0

)

3rd Coast Brake (B

1

)

Direct Clutch (C

2

)

Forward Clutch (C

1

)

No.1 One–way Clutch (F

1

)

2nd Brake (B

3

)

1st & Reverse Brake (B

4

)

No.2 One–way Clutch (F

2

)

3rd Brake (B

2

)

O/D Direct Clutch (C

0

)

Shift Solenoid Valve No.4

Shift Solenoid Valve No.3

Shift Solenoid Valve No.1

Shift Solenoid Valve No.2

Shift Solenoid Valve SLT

Shift Solenoid Valve SLU

Shift Solenoid Valve SLN

Park

Reverse

Neutral

1st

2nd

4th
5th

1st

4th

1st

3rd

1st

1st

S1

S2

S3

C

0

C

1

C

2

B

0

B

1

B

2

B

3

B

4

F

0

F

1

F

2

: Operating

Gear
Position

Shift Lever
Position

ON

OFF

ON

ON

ON

ON

ON

ON

ON

ON

ON
ON

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

ON

ON

ON

OFF

OFF

ON
ON

OFF

OFF

ON OFF

OFF OFF

OFF ON

OFF OFF

OFF

ON

2nd

2nd

2nd

3rd

3rd

S4

ON OFF ON

OFF

ON

ON

ON

OFF
OFF
OFF
OFF
OFF

OFF

OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF

R
N

D

4

3

2

L

P

OFF ON OFF

OFF ON OFF

OFF
OFF

AT–2

–

AUTOMATIC TRANSMISSION

AUTOMATIC TRANSMISSION SYSTEM

1509

OPERATION

AT03C–01

D01007

–

AUTOMATIC TRANSMISSION

AUTOMATIC TRANSMISSION UNIT

AT–21

1528

INSTALLATION

1.

CHECK TORQUE CONVERTER CLUTCH INSTALLA-
TION

Using calipers and a straight edge, measure from the installed
surface of the torque converter clutch to the front surface of the
transmission housing.

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–17

)

HINT:
After installation, check and inspect items as follows.

Adjust the shift lever position. (See page

DI–173

)

Check fluid level. (See page

DI–173

)

Do the road test. (See page

DI–173

)

AT03D–01

AT5436

SST

AT5437

Lock

Free

Q03546

AT–22

–

AUTOMATIC TRANSMISSION

TORQUE CONVERTER CLUTCH AND DRIVE PLATE

1529

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 starter 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)