TOYOTA SIENNA 2007 Service Repair Manual

AX–14U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
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(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

U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–15
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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–16U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
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(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

U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–17
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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–18U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
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INITIALIZATION
1. RESET MEMORY
NOTICE:
• Perform the RESET MEMORY (AT initialization)
when replacing the automatic transaxle assembly,
engine assembly or ECM.
• The RESET MEMORY can be performed only with
the Intelligent tester.
HINT:
The ECM memorizes the condition that the ECT controls
the automatic transaxle assembly and engine assembly
according to those characteristics. Therefore, when the
automatic transaxle assembly, engine assembly, or ECM
has been replaced, it is necessary to reset the memory
so that the ECM can memorize the new information.
Reset procedure is as follows.
(a) Turn the engine switch off.
(b) Connect the intelligent tester together with the CAN
VIM (controller area network vehicle interface
module) to the DLC3.
(c) Turn the ignition switch to the ON position and push
the intelligent tester main switch on.
(d) Select the item "DIAGNOSIS / ENHANCED OBD
II".
(e) Perform the reset memory procedure from the
ENGINE menu.
CAUTION:
After performing the RESET MEMORY, be sure
to perform the ROAD TEST (See page AX-9)
described earlier.
HINT:
The ECM is learned by performing the ROAD TEST.
(1) Tester menu flow:

U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–19
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G023367

AX–20U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
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MONITOR DRIVE PATTERN
1. MONITOR DRIVE PATTERN FOR ECT TEST
(a) Perform this drive pattern as one method to
simulate the detection conditions of the ECT
malfunctions. (The DTCs may not be detected due
the actual driving conditions. And some codes may
not be detected through this drive pattern.)
HINT:
Preparation for driving
• Warm up the engine sufficiently. (Engine coolant
temperature is 60
C (140F) or higher)
• Drive the vehicle when the atmospheric
temperature is -10
C (14F) or higher.
(Malfunction is not detected when the
atmospheric temperature is less than -10
C
(14
F))
Driving note
• Drive the vehicle through all gears.
Stop
1st 2nd 3rd 4th 5th 5th
(lock-up ON).
• Repeat the above driving pattern three times or
more.
NOTICE:
• The monitor status can be checked using the
OBD II scan tool or intelligent tester. When
using the intelligent tester, monitor status
can be found in the "ENHANCED OBD II /
DATA LIST" or under "CARB OBD II".
• In the event that the drive pattern must be
interrupted (possibly due to traffic conditions
or other factors), the drive pattern can be
resumed and, in most cases, the monitor can
be completed.
• Perform this drive pattern on a level road as
much as possible and strictly observe the
posted speed limits and traffic laws while
driving.

U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–21
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HINT:
*1: Drive at such a speed in the uppermost gear, to
engage lock-up. The vehicle can be driven at a
speed lower than that in the above diagram under
the lock-up condition.
NOTICE:
If necessary to drive the vehicle for
approximately 30 minutes to detect DTC P0711
(ATF temperature sensor malfunction).
G031593E28

AX–22U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
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PROBLEM SYMPTOMS TABLE
HINT:
• If a normal code is displayed during the diagnostic trouble
code check although the trouble still occurs, check the
electrical circuits for each symptom in the order given in
the charts on the following pages and proceed to the page
given for troubleshooting.
• The Matrix Chart is divided into 2 chapters.
• When the circuit on which mark *1 is attached is a
malfunction, DTC could be output.
Refer to the table below when the trouble cause is considered
to be electrical. If the instruction PROCEED TO NEXT
CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE is given in the flowchart of each circuit, inspect the
suspected areas in descending order for each symptom. If
the trouble still occurs even though there are no
abnormalities in the inspections listed for the symptoms,
check and replace the ECM.
1. Chapter 1: Electronic Circuit Matrix Chart
Symptom Suspected Area See page
No down-shift (A particular gear, from 1st to 4th gear,
is not down-shifted)ECMIN-30
No down-shift (5th -> 4th)Transmission control switch (D <--> 4 position) circuitAX-38
Shift solenoid valve S4 circuit *1AX-104
ECMIN-30
No up-shift (A particular gear, from 1st to 4th gear, is
not up-shifted)ECMIN-30
No up-shift (4th -> 5th)Transmission control switch (D <--> 4 position) circuitAX-38
Shift solenoid valve S4 circuit *1AX-104
ECMIN-30
No lock-upStop light switch circuit *1AX-56
Engine coolant temp. sensor circuit *1ES-56
ECMIN-30
No lock-up off ECMIN-30
Shift point too high or too lowThrottle position sensor circuit *1ES-56
ECMIN-30
Up-shift to 5th from 4th while shift lever is in 4 positionTransmission control switch (D <--> 4 position) circuitAX-38
ECMIN-30
Up-shift to 5th from 4th while engine is coldEngine coolant temp. sensor circuit *1ES-56
ECMIN-30
Up-shift to 2nd from 1st while shift lever is in L positionTransmission control switch (L <--> 2 position) circuit *1AX-38
ECMIN-30
Harsh engagement (N -> D)Shift solenoid valve SL1 circuit *1AX-70
ECMIN-30
Harsh engagement (Lock-up) ECMIN-30
Harsh engagement (Any driving position) ECMIN-30
Poor acceleration ECMIN-30
No kick-down ECMIN-30
Engine stalls when starting off or stopping ECMIN-30
Malfunction in shiftingPark/neutral position switch circuit *1AX-38
Transmission control switch (D <--> 4 position) circuitAX-38
ECMIN-30

U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–23
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2. Chapter 2: On-Vehicle Repair and Off-Vehicle Repair
Symptom Suspected Area See page
Vehicle does not move in any forward position and in
reverse positionsValve body assemblyAX-136
U/D brake (B3)AX-177
Torque converter clutchAX-170
Vehicle does not move in R positionValve body assemblyAX-136
Reverse clutch (C2)AX-177
1st and reverse brake (B2)AX-177
No up-shift (1st -> 2nd)Valve body assemblyAX-136
2nd and O/D brake (B1)AX-177
No up-shift (2nd -> 3rd)Valve body assemblyAX-136
Direct and O/D clutch (C0)AX-177
No up-shift (3rd -> 4th)Valve body assemblyAX-136
2nd and O/D brake (B1)AX-177
No up-shift (4th -> 5th)Shift solenoid valve S4AX-74
Valve body assemblyAX-136
U/D clutch (C3)AX-177
No down-shift (5th -> 4th)Shift solenoid valve S4AX-74
Valve body assemblyAX-136
No down-shift (4th -> 3rd) Valve body assemblyAX-136
No down-shift (3rd -> 2nd) Valve body assemblyAX-136
No down-shift (2nd -> 1st) Valve body assemblyAX-136
No lock-up or No lock-up offShift solenoid valve DSLAX-60
Valve body assemblyAX-136
Torque converter clutchAX-170
Harsh engagement (N -> D)Shift solenoid valve SL1AX-66
Valve body assemblyAX-136
C1 accumulatorAX-177
Forward clutch (C1)AX-177
No. 1 one-way clutch (F1)AX-177
U/D one-way clutch (F2)AX-177
Harsh engagement (Lock-up)Shift solenoid valve SL2AX-82
Valve body assemblyAX-136
Torque converter clutchAX-170
Harsh engagement (N -> R)Valve body assemblyAX-136
C2 accumulatorAX-177
Reverse clutch (C2)AX-177
1st and reverse brake (B2)AX-177
Harsh engagement (1st -> 2nd -> 3rd -> 4th -> 5th)Shift solenoid valve SLTAX-116
Valve body assemblyAX-136
Harsh engagement (1st -> 2nd)Valve body assemblyAX-136
2nd and O/D brake (B1)AX-177
Harsh engagement (2nd -> 3rd)Valve body assemblyAX-136
C0 accumulatorAX-177
Direct and O/D clutch (C0)AX-177
Harsh engagement (3rd -> 4th)Valve body assemblyAX-136
2nd and O/D brake (B1)AX-177
Harsh engagement (4th -> 5th)Valve body assemblyAX-136
C3 accumulatorAX-177
U/D clutch (B3)AX-177