2003 LEXUS LS430 automatic transmission

PRECAUTION
1. The automatic transmission is composed of highly precision-finished parts which need careful inspection
before reassembly because even a small nick could cause fluid leakage or affect performance. The
instructions here are organized so that you work on only one component group at a time. This will help
avoid confusion from similar-looking parts of different sub-assemblies being on your workbench at the
same time. The component groups should be inspected and repaired from the converter housing side.
Inspect, repair and reassemble as much as possible before proceeding to the next component group. If a
defect is found in a certain component group during reassembly, inspect and repair this group
immediately. If a component group cannot be assembled because parts are being ordered, be sure to keep
all parts of the group in a separate container while proceeding with disassembly, inspection, repair and
reassembly of other component groups. Recommended ATF: ATF WS
2. All disassembled parts should be washed clean and any fluid passages and holes should be blown through
with compressed air.
3. Dry all parts with compressed air. Never use shop rags.
4. When using compressed air, be careful not to not aim at yourself to prevent accidentally spraying ATF or
kerosene on your face.
5. Only recommended automatic transaxle fluid or kerosene should be used for cleaning.
6. After cleaning, the parts should be arranged in the correct order for efficient inspection, repairs, and
reassembly.
7. When disassembling a valve body, be sure to match each valve together with the corresponding spring.
8. New discs for the brakes and clutches that are to be used for replacement must be soaked in ATF for at
least 15 minutes before reassembly.
9. All oil seal rings, clutch discs, clutch plates, rotating parts, and sliding surfaces should be coated with
ATF prior to reassembly.
10. All gaskets and rubber O-rings should be replaced.
11. Do not apply adhesive cements to gaskets or similar parts.
12. Make sure that the ends of a snap ring are not aligned with one of the cutouts and are installed in the
groove correctly.
13. When replacing a worn bushing, the sub-assembly containing the bushing must also be replaced.
14. Check thrust bearings and races for wear or damage. Replace them as necessary.
15. Use petroleum jelly to keep parts in place.
16. When working with FIPG material, perform the following: Using a razor blade and a gasket scraper,
remove all the old packing (FIPG) material from the gasket surface.
Thoroughly clean all components to remove any loose material.

17.REMOVE FRONT FLOOR BRACE CENTER (SEE REPLACEMENT )
18.REMOVE EXHAUST PIPE ASSY (SEE REPLACEMENT
)
19.REMOVE FRONT FLOOR HEAT INSULATOR NO.1 (SEE REPLACEMENT
)
20.REMOVE PROPELLER W/CENTER BEARING SHAFT ASSY (SEE OVERHAUL
)
SST 09922-10010
21.SEPARATE FLOOR SHIFT GEAR SHIFTING ROD SUB-ASSY
a. Remove the nut and separate the floor shift gear shifting rod.
Fig. 7: Removing Nut And Separating Floor Shift Gear Shifting Rod

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
22.SUPPORT AUTOMATIC TRANSMISSION ASSY
a. Support the automatic transmission assy with a transmission jack.
23.SEPARATE ENGINE REAR MOUNTING MEMBER
a. Remove the 4 bolts and separate the engine rear mounting member.

Fig. 25: Identifying Automatic Transmission Assy Components
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
REPLACEMENT
1.DISCONNECT BATTERY NEGATIVE TERMINAL
2.REMOVE ENGINE UNDER COVER NO.1

3.REMOVE ENGINE UNDER COVER NO.2
4.REMOVE INSTRUMENT PANEL UNDER COVER SUB-ASSY NO.2 (SEE REPLACEMENT
)
5.REMOVE INSTRUMENT PANEL GARNISH SUB-ASSY LH (SEE REPLACEMENT
)
6.REMOVE INSTRUMENT PANEL FINISH PANEL (SEE REPLACEMENT
)
7.REMOVE INSTRUMENT PANEL UNDER COVER SUB-ASSY NO.1 (SEE REPLACEMENT
)
8.REMOVE SWITCH BRACE HOLE COVER (SEE REPLACEMENT
)
9.REMOVE INSTRUMENT PANEL SAFETY PAD SUB-ASSY NO.1 (SEE REPLACEMENT
)
10.REMOVE INSTRUMENT PANEL CUP HOLDER ASSY (SEE REPLACEMENT
)
11.REMOVE CONSOLE UPPER REAR PANEL SUB-ASSY (SEE REPLACEMENT
)
12.REMOVE CONSOLE BOX CARPET (SEE REPLACEMENT
)
13.REMOVE REAR CONSOLE ARMREST ASSY (SEE REPLACEMENT
)
14.REMOVE INSTRUMENT PANEL FINISH PANEL LOWER CENTER (SEE REPLACEMENT
)
15.REMOVE INSTRUMENT CLUSTER FINISH PANEL SUB-ASSY CENTER (SEE
REPLACEMENT
)
16.REMOVE CONSOLE PANEL SUB-ASSY UPPER (SEE REPLACEMENT
)
17.REMOVE CONSOLE BOX (SEE REPLACEMENT
)
18.SEPARATE OXYGEN SENSOR (SEE REPLACEMENT
)
a. Separate the 2 heated oxygen sensors.
19.REMOVE FRONT FLOOR BRACE CENTER (SEE REPLACEMENT
)
20.REMOVE EXHAUST PIPE ASSY (SEE REPLACEMENT
)
21.REMOVE FRONT FLOOR HEAT INSULATOR NO.1 (SEE OVERHAUL
)
22.REMOVE PROPELLER W/CENTER BEARING SHAFT ASSY (SEE OVERHAUL
)
SST 09922-10010
23.DRAIN AUTOMATIC TRANSMISSION FLUID
a. Remove the drain plug, gasket and drain the ATF.
b.Install a new gasket and the drain plug.
Torque: 20 N.m (205 kgf.cm, 15 ft.lbf)
24.REMOVE EXHAUST PIPE NO.1 SUPPORT BRACKET SUB-ASSY
a. Remove the 2 bolts and exhaust pipe No.1 support bracket sub-ass
y.

Fig. 27: Removing 2 Bolts And Clamps
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Loosen the union nut and separate the oil cooler inlet tube No.1.
26.SEPARATE OIL COOLER OUTLET TUBE NO.1
a. Loosen the union nut and separate the oil cooler outlet tube No.1
27.SEPARATE FLOOR SHIFT GEAR SHIFTING ROD SUB-ASSY
a. Remove the nut and separate the floor shift gear shifting rod.
Fig. 28: Removing Nut And Separating Floor Shift Gear Shifting Rod

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
28.SUPPORT AUTOMATIC TRANSMISSION ASSY
a. Support the automatic transmission assy with a transmission jack.
29.REMOVE ENGINE REAR MOUNTING MEMBER
a. Remove the 4 bolts and separate the engine rear mounting member.

Fig. 30: Removing 4 Nuts And Engine Rear Mounting Member
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
30.DISCONNECT CONNECTOR
a. Tilt down the automatic transmission.
b. Disconnect the park/neutral position switch connector.
c. Disconnect the transmission wire connector.
d. Disconnect the 2 speed sensor connectors.
31.DISCONNECT WIRE HARNESS
a. Remove the 5 bolts and wire harness clamps.
b. Separate the wire harness from the automatic transmission assy.
HINT:
Bolt (a) is ti
ghtened to the transmission housing.

Fig. 31: Removing 5 Bolts And Wire Harness Clamps
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
32.REMOVE FLYWHEEL HOUSING UNDER COVER
a. Remove the 2 bolts and flywheel housing under cover.
Fig. 32: Removing 2 Bolts And Flywheel Housing Under Cover

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
33.REMOVE AUTOMATIC TRANSMISSION ASSY
a. Turn the crankshaft to gain access to each bolt.
b. Hold the crankshaft pulley nut with a wrench and remove the 6 bolts.

Fig. 33: Locating Bolts
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
c. Remove the 9 bolts.
d. Separate and remove the automatic transmission assy.
HINT:
Bolt (a) is tightened to the transmission housing.
At the time of installation, lift the engine front side as shown in illustration (A).