2007 TOYOTA SIENNA automatic transmission

AX–180U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE UNIT
AX
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.
C091933
C083127
C083128
C083129
D003554E01

AX–232U151E AUTOMATIC TRANSAXLE – OIL PUMP
AX
TRANSMISSION
U151E AUTOMATIC TRANSAXLE
OIL PUMP
COMPONENTS
C114866E01

AX–246U151E AUTOMATIC TRANSAXLE – DIRECT CLUTCH
AX
TRANSMISSION
U151E AUTOMATIC TRANSAXLE
DIRECT CLUTCH
COMPONENTS
C119011E02

AX–254U151E AUTOMATIC TRANSAXLE – UNDERDRIVE PLANETARY GEAR
AX
TRANSMISSION
U151E AUTOMATIC TRANSAXLE
UNDERDRIVE PLANETARY GEAR
COMPONENTS
C114868E03

AX–260U151E AUTOMATIC TRANSAXLE – UNDERDRIVE CLUTCH
AX
TRANSMISSION
U151E AUTOMATIC TRANSAXLE
UNDERDRIVE CLUTCH
COMPONENTS
C114869E04

AX–266U151E AUTOMATIC TRANSAXLE – DIFFERENTIAL CASE
AX
TRANSMISSION
U151E AUTOMATIC TRANSAXLE
DIFFERENTIAL CASE
COMPONENTS
C114871E03

AX–6U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
AX
SYSTEM DESCRIPTION
1. SYSTEM DESCRIPTION
(a) The ECT (Electronic controlled automatic
transmission/transaxle) is an automatic
transmission/transaxle that electronically controls
shift timing using the ECM. The ECM detects
electrical signals that indicate engine and driving
conditions, and controls the shift point, based on
driver habits and road conditions. As a result, fuel
efficiency and power transmission performance are
improved.
Shift shock has been reduced by controlling the
engine and transmission simultaneously.
In addition, the ECT has features such as follows:
• Diagnostic function.
• Fail-safe function when a malfunction occurs.

U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–13
AX
MECHANICAL SYSTEM TESTS
1. PERFORM MECHANICAL SYSTEM TESTS
(a) Measure the stall speed.
The object of this test is to check the overall
performance of the transaxle and engine by
measuring the stall speeds in the D position.
NOTICE:
• Driving test should be done on a paved road
(a nonskid road).
• Perform the test at the normal operating ATF
(Automatic Transmission Fluid) temperature
50 to 80
C (122 to 176F).
• Do not continuously run this test for longer
than 10 seconds.
• To ensure safety, do this test in a wide, clear
level area which provides good traction.
• The stall test should always be carried out in
pairs. One technician should observe the
conditions of wheels or wheel stoppers
outside the vehicle while the other is doing
the test.
(1) Chock the 4 wheels.
(2) Connect the intelligent tester together with the
CAN VIM (controller area network vehicle
interface module) to the DLC3.
(3) Fully apply the parking brake.
(4) Keep your left foot pressed firmly on the brake
pedal.
(5) Start the engine.
(6) Shift into the D position. Press all the way down
on the accelerator pedal with your right foot.
(7) Quickly read the stall speed at this time.
Stall speed:
2,600 +- 150 rpm
Evaluation:
Problem Possible cause
(a) Stall engine speed is low in D position• Engine power output may be insufficient
• Stator one-way clutch not operating properly
HINT:
If the value is less than the specified value by 600 rpm or more, the
torque converter could be faulty.
(b) Stall engine speed is high in D position• Line pressure is too low
• Forward clutch slipping
• U/D (Underdrive) brake slipping
• U/D (Underdrive) one-way clutch is not operating properly
• No.1 one-way clutch not operating properly
• Improper fluid level