2007 TOYOTA SIENNA automatic transmission

AX–14U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
AX
(b) Measure the time lag.
(1) When the shift lever is shifted while the engine is
idling, there will be a certain time lapse or lag
before the shock can be felt. This is used for
checking the condition of the clutch and brake.
NOTICE:
• Perform the test at the normal operating
ATF (Automatic Transmission Fluid)
temperature: 50 to 80
C (122 to 176F).
• Be sure to allow 1 minute interval between
tests.
• Perform the test three times, and measure
the time lags. Calculate the average value
of the three time lags.
• When conducting stall test, do not
continue more than 10 seconds.
(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) Start and warm up the engine and check idle
speed.
Idle speed:
approx. 700 rpm (In N position and A/C
OFF)
(5) Shift the lever from N to D position. Using a stop
watch, measure the time from when the lever is
shifted until the shock is felt.
Time lag:
N
D less than 1.2 seconds
(6) In the same way, measure the time lag for N

R.
Time lag:
N
R less than 1.5 seconds
Evaluation (If N
D or N R time lag is longer than the specified):
Problem Possible cause
N
D time lag is longer• Line pressure is too low
• Forward clutch worn
• No.1 one-way clutch is not operating properly
• U/D (Underdrive) one-way clutch is not operating
• U/D (Underdrive) brake worn
N
R time lag is longer• Line pressure is too low
• Reverse clutch worn
• 1st and reverse brake worn
• U/D (Underdrive) brake worn

U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–15
AX
HYDRAULIC TEST
1. PERFORM HYDRAULIC TEST
(a) Measure the line pressure.
NOTICE:
• Perform the test at the normal operating ATF
(Automatic Transmission Fluid) temperature:
50 to 80
C (122 to 176F).
• The line pressure 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 performing the test.
• Be careful to prevent SST hose from
interfering with the exhaust pipe.
• This Check must be conducted after checking
and adjusting engine.
• Perform under condition that A/C is OFF.
• When conducting stall test, do not continue
more than 10 seconds.
(1) Warm up the ATF (Automatic Transmission
Fluid).
(2) Lift the vehicle up.
(3) Remove the engine under cover.
(4) Connect the intelligent tester together with the
CAN VIM (controller area network vehicle
interface module) to the DLC3.
(5) Remove the test plug A on the transaxle case
front left side and install the SST.
SST 09992-00095 (09992-00231, 09992-
00271)
NOTICE:
There is a difference in installation point
between D position and R position.
(6) Start the engine.
(7) Using intelligent tester, shift to D position and
hold 3rd gear by active test, and measure the
line pressure in idling.
Specified line pressure:
(8) Turn the ignition switch off.
C160153E01
Condition
D position kPa (kgf / cm2, psi)
Idling372 to 412 kPa
(3.8 to 4.2 kgf/cm
2, 54 to 60 psi)

AX–16U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
AX
(9) Disconnect the connector of the transmission
wire.
HINT:
Disconnect the connector only when performing
the D position stall test.
(10)Start the engine.
(11)Firmly depress the brake pedal, shift to the D
position, depress the accelerator pedal all the
way down and check the line pressure while the
stall test is performed.
Specified line pressure:
(12)Turn the ignition switch off.
(13)Remove the SST, install the test plug A.
(14)Remove the test plug B, install the SST and
start engine.
SST 09992-00095 (09992-00231, 09992-
00271)
(15)Connect the transmission wire connector,
depress the brake pedal firmly, shift to the R
position and check that the line pressure while
the engine is idling and during the stall test.
Specified line pressure:
(16)Remove the SST, install the test plug B.
(17)Clear the DTC.
Evaluation:
C160154E01
Condition
D position kPa (kgf / cm2, psi)
Stall test931 to 1,031 kPa
(9.5 to 10.5 kgf/cm
2, 135 to 150 psi)
Condition
R position kPa (kgf / cm
2, psi)
Idling672 to 742 kPa
(6.9 to 7.6 kgf/cm
2, 97 to 108 psi)
Stall test1,768 to 1,968 kPa
(18.0 to 20.1 kgf/cm
2, 256 to 285 psi)
Problem Possible cause
Measured values are higher than specified in all positions• Shift solenoid valve SLT defective
• Regulator valve defective
Measured values are lower than specified in all positions• Shift solenoid valve SLT defective
• Regulator valve defective
• Oil pump defective
• U/D (Underdrive) direct clutch defective
Pressure is low in the D position only• D position circuit fluid leak
• Forward clutch defective
Pressure is low in the R position only• R position circuit fluid leak
• Reverse clutch defective
• 1st and reverse brake defective

U151F AUTOMATIC TRANSAXLE – PARK / NEUTRAL POSITION SWITCHAX–129
AX
(j) Install the control shaft lever, washer and the nut.
Torque: 13 N*m (130 kgf*cm, 9 ft.*lbf)
(k) Connect the park/neutral position switch connector.
2. CONNECT TRANSMISSION CONTROL CABLE
ASSEMBLY
(a) Connect the control cable to the control shaft lever
with the nut.
Torque: 13 N*m (133 kgf*cm, 10 ft.*lbf)
(b) Install the control cable with a new clip to the
bracket.
3. ADJUST PARK/NEUTRAL POSITION SWITCH
ASSEMBLY (See page AX-127)
4. INSPECT PARK/NEUTRAL POSITION SWITCH
ASSEMBLY OPERATION (See page AX-126)
5. INSPECT SHIFT LEVER POSITION (See page AX-148)
6. ADJUST SHIFT LEVER POSITION (See page AX-149)
7. INSTALL AIR CLEANER ASSEMBLY
HINT:
(See page EM-44)
8. INSTALL BATTERY
C099458
C092283
D030614
D025415

U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–17
AX
MANUAL SHIFTING TEST
1. PERFORM MANUAL SHIFTING TEST
HINT:
• With this test, it can be determined whether the
trouble occurs in the electrical circuit or is a
mechanical problem in the transaxle.
• If any abnormalities are found in the following test, the
problem is in the transaxle itself.
(a) Disconnect the connector of the transmission wire.
(b) Drive with the transmission wire disconnected.
Shifting the shift lever in the order of L, 2, 3, 4 and D
position to check whether the shifting condition
changes the table below.
HINT:
When driving with the transmission wire
disconnected, the shift lever position is in L or 2, the
gear position is held in 3rd and the shift lever
position is in 3, 4 or D, the gear position is held in
4th. However, when the shift position is in R or P, the
operation is same as usual.
(c) Connect the connector of the transmission wire.
(d) Clear the DTC (See page AX-27).
C160154E01
Shift Position Shifting Condition
L
2 No Shift (Not Change)
2
3 Down Shift Up Shift
3
4 D No Shift (Not Change)

AX–130U151F AUTOMATIC TRANSAXLE – TRANSMISSION WIRE
AX
TRANSMISSION
U151F AUTOMATIC TRANSAXLE
TRANSMISSION WIRE
COMPONENTS
C119004E05

U151F AUTOMATIC TRANSAXLE – TRANSMISSION WIREAX–131
AX
REMOVAL
1. DISCONNECT CABLE FROM NEGATIVE BATTERY
TERMINAL
2. REMOVE ENGINE UNDER COVER NO.1
3. DRAIN AUTOMATIC TRANSAXLE FLUID
(a) Remove the drain plug and gasket, and drain the
AT F.
(b) Install a new gasket and the drain plug.
Torque: 49 N*m (500 kgf*cm, 36 ft.*lbf)
4. REMOVE AUTOMATIC TRANSAXLE OIL PAN SUB-
ASSEMBLY
(a) Remove the 18 bolts, oil pan and gasket.
NOTICE:
Some fluid will remain in the oil pan. Carefully
remove the oil pan so that fluid remaining in the
pan does not spill out.
(b) Remove the 2 magnets from the oil pan.
(c) Examine particles in the pan.
(1) Collect any steel chips using the removed
magnets. Look carefully at the chips and
particles in the pan and on the magnets to see
the type of wear which might be found in the
transaxle.
Result:
Steel (magnetic):
Wear of the bearing, gear or plate
Brass (non-magnetic):
Wear of the bearing
5. DISCONNECT TRANSMISSION WIRE
(a) Disconnect the 7 shift solenoid valve connectors.
(b) Remove the bolt and lock plate, and disconnect the
ATF temperature sensor.
C091925
D030865
AT00103
C091927E04

AX–132U151F AUTOMATIC TRANSAXLE – TRANSMISSION WIRE
AX
6. REMOVE TRANSMISSION WIRE
(a) Disconnect the transmission wire connector.
(b) Remove the bolt and transmission wire.
(c) Remove the O-ring from the transmission wire.
INSTALLATION
1. INSTALL TRANSMISSION WIRE
(a) Coat the O-ring of the transmission wire connector
with ATF and install it.
(b) Install the transmission wire with the bolt.
Torque: 5.4 N*m (55 kgf*cm, 48 ft.*lbf)
2. CONNECT TRANSMISSION WIRE
(a) Coat the O-ring of the ATF temperature sensor with
AT F.
(b) Install the ATF temperature sensor with the lock
plate and bolt.
Torque: 6.6 N*m (67 kgf*cm, 58 ft.*lbf)
(c) Connect the 7 shift solenoid valve connectors.
3. INSTALL AUTOMATIC TRANSAXLE OIL PAN SUB-
ASSEMBLY
(a) Install the 2 magnets in the oil pan.
(b) Apply seal packing to the 18 bolts.
Seal packing:
THREE BOND 2430 or equivalent
D030866
D030867
D030866
C091927E04
D030865