TOYOTA SIENNA 2007 Service Repair Manual

U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE UNITAX–177
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DISASSEMBLY
1. REMOVE PARK/NEUTRAL POSITION SWITCH
ASSEMBLY
(a) Remove the nut, washer and control shaft lever.
(b) Using a screwdriver, unstake the nut stopper, and
remove the lock nut and nut stopper.
(c) Remove the 2 bolts and pull out the park/neutral
position switch.
2. REMOVE BREATHER PLUG HOSE
(a) Remove the breather plug hose from the transaxle
case.
3. REMOVE OIL COOLER TUBE UNION (INLET OIL
COOLER UNION)
(a) Remove the union.
(b) Remove the O-ring from the union.
4. REMOVE OIL COOLER TUBE UNION (OUTLET OIL
COOLER UNION)
(a) Remove the elbow.
(b) Remove the O-ring from the elbow.
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5. REMOVE SPEED SENSOR
(a) Remove the 2 bolts and the 2 speed sensors from
the transaxle assembly.
6. REMOVE TRANSAXLE CASE NO.1 PLUG
(a) Remove the 4 transaxle case No.1 plugs from the
transaxle case.
(b) Remove the 4 O-rings from the 4 transaxle case
No.1 plugs.
7. FIX AUTOMATIC TRANSAXLE ASSEMBLY
(a) Fix the transaxle assembly.
8. REMOVE AUTOMATIC TRANSAXLE OIL PAN SUB-
ASSEMBLY
(a) Remove the 18 bolts, oil pan and gasket.
(b) Remove the 2 magnets from the oil pan.
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9. INSPECT TRANSMISSION OIL CLEANER MAGNET
(a) Remove the magnets and use them to collect any
steel chips. Examine the chips and particles in the
pan and on the magnet to determine what type of
wear has occurred in the transaxle:
Result:
Steel (magnetic):
Wear of the bearing, gear and plate
Brass (non-magnetic):
Wear of the bushing
10. DISCONNECT TRANSMISSION WIRE
(a) Remove the 7 connectors from the shift solenoid
valves.
(b) Remove the bolt, lock plate and temperature
sensor.
11. REMOVE TRANSMISSION WIRE
(a) Remove the bolt and transmission wire from the
transaxle case.
12. REMOVE VALVE BODY OIL STRAINER ASSEMBLY
(a) Remove the 3 bolts and oil strainer.
(b) Remove the O-ring from the oil strainer.
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AX–180U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE UNIT
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13. REMOVE TRANSMISSION VALVE BODY ASSEMBLY
(a) Support the valve body assembly and remove the
17 bolts and valve body assembly.
14. REMOVE GOVERNOR APPLY GASKET NO.1
(a) Remove the governor apply gasket No.1 from the
transaxle case.
15. REMOVE TRANSAXLE CASE 2ND BRAKE GASKET
(a) Remove the transaxle case 2nd brake gasket from
the transaxle case.
16. REMOVE BRAKE DRUM GASKET
(a) Remove the brake drum gasket from the transaxle
case.
17. REMOVE CHECK BALL BODY
(a) Remove the check ball body and spring from the
transaxle case.
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18. REMOVE C-3 ACCUMULATOR PISTON
(a) Remove the spring from the C-3 accumulator
piston.
(b) Apply compressed air (392 kPa, 4.0 kgf/cm
2, 57 psi)
to the oil hole and remove the C-3 accumulator
piston.
NOTICE:
• Applying compressed air may cause the
piston to jump-out. When removing the
piston, hold it using a waste cloth.
• Take care not to splash ATF when applying
compressed air.
(c) Remove the O-ring from the C-3 accumulator
piston.
19. REMOVE REVERSE CLUTCH ACCUMULATOR
PISTON
(a) Apply compressed air (392 kPa, 4.0 kgf/cm
2, 57 psi)
to the oil hole and remove the reverse accumulator
piston and spring.
NOTICE:
• Applying compressed air may cause the
piston to jump-out. When removing the
piston, hold it using a waste cloth.
• Take care not to splash ATF when applying
compressed air.
(b) Remove the 2 O-rings from the reverse clutch
accumulator piston.
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20. REMOVE B-3 ACCUMULATOR PISTON
(a) Apply compressed air (392 kPa, 4.0 kgf/cm
2, 57 psi)
to the oil hole and remove the B-3 accumulator
piston and 2 springs.
NOTICE:
• Applying compressed air may cause the
piston to jump-out. When removing the
piston, hold it using a waste cloth.
• Take care not to splash ATF when applying
compressed air.
(b) Remove the O-ring from the B-3 accumulator
piston.
21. REMOVE MANUAL VALVE LEVER SHAFT RETAINER
SPRING
(a) Using needle-nose pliers, remove the manual valve
lever shaft retainer spring.
22. REMOVE MANUAL DETENT SPRING SUB-
ASSEMBLY
(a) Remove the 2 bolts, the manual detent spring sub-
assembly and cover.
23. REMOVE PARKING LOCK PAWL BRACKET
(a) Remove the 2 bolts and parking lock pawl bracket.
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24. REMOVE MANUAL VALVE LEVER SUB-ASSEMBLY
(a) Using a chisel and hammer, cut off and remove the
spacer.
(b) Using a pin punch (
35 mm) and hammer, drive out
the pin.
HINT:
Slowly drive out the pin so that it will not fall into the
transaxle case.
(c) Remove the manual valve lever shaft and manual
valve lever.
25. REMOVE PARKING LOCK ROD SUB-ASSEMBLY
(a) Remove the parking lock rod from the manual valve
lever.
26. REMOVE MANUAL VALVE LEVER SHAFT OIL SEAL
(a) Using a screwdriver, remove the oil seal from the
transaxle case.
NOTICE:
Do not apply excessive force when removing
the oil seal.
27. FIX AUTOMATIC TRANSAXLE ASSEMBLY
(a) Fix the transaxle case with the oil pump side facing
up.
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28. INSPECT INPUT SHAFT ENDPLAY
HINT:
(See page AX-200)
29. REMOVE TRANSAXLE HOUSING
(a) Remove the 16 bolts.
(b) Tap on the circumference of the transaxle housing
with a plastic hammer to remove the transaxle
housing from the transaxle case.
NOTICE:
The differential may be accidentally removed
when the transaxle housing is removed.
30. REMOVE OIL PUMP ASSEMBLY
(a) Remove the 7 bolts and oil pump from the transaxle
case.
31. REMOVE THRUST NEEDLE ROLLER BEARING
(a) Remove the thrust needle roller bearing from the
underdrive planetary gear assembly.
32. REMOVE THRUST BEARING UNDERDRIVE RACE
NO.2
(a) Remove the thrust bearing underdrive race No.2
from the underdrive planetary gear assembly.
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33. REMOVE DIFFERENTIAL GEAR ASSEMBLY
(a) Remove the differential gear assembly from the
transaxle case.
34. REMOVE OVERDRIVE BRAKE GASKET
(a) Remove the 2 overdrive brake gaskets from the
transaxle case.
35. REMOVE FORWARD CLUTCH ASSEMBLY
(a) Remove the forward clutch assembly from the
transaxle case.
(b) Remove the thrust needle roller bearing from the
forward clutch.
36. REMOVE MULTIPLE DISC CLUTCH HUB
(a) Remove the thrust needle roller bearing, multiple
disc clutch hub, thrust needle roller bearing and
thrust bearing race No.1 from the transaxle case.
37. INSPECT MULTIPLE DISC CLUTCH CLUTCH HUB
HINT:
(See page AX-197)
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38. REMOVE UNDERDRIVE PLANETARY GEAR
ASSEMBLY
(a) Remove the bolt and pawl shaft clamp.
(b) Remove the parking lock pawl shaft.
(c) Push the parking lock pawl.
HINT:
Failure to do so will cause interference when the
underdrive planetary gear is removed.
(d) Remove the underdrive planetary gear assembly
from the transaxle case.
NOTICE:
Be careful so that the underdrive planetary gear
assembly will not fall out.
39. REMOVE PARKING LOCK PAWL
(a) Remove the spring, pawl pin and parking lock pawl.
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