check engine TOYOTA SIENNA 2007 Service Repair Manual

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–127
AX
INSPECTION
1. INSPECT PARK/NEUTRAL POSITION SWITCH
ASSEMBLY OPERATION
(a) Apply the parking brake and turn the ignition switch
to the ON position.
(b) Depress the brake pedal and check that the engine
starts only when the shift lever is in the N or P
position and the engine does not start when the shift
lever is in other positions.
(c) Check that the back up light comes on and the
reverse warning buzzer sounds only when the shift
lever is in the R position and the light and buzzer do
not operate when the shift lever is in other positions.
(d) If a failure is found, check the park/neutral position
switch for continuity.
2. INSPECT PARK/NEUTRAL POSITION SWITCH
ASSEMBLY
(a) Jack up the vehicle.
(b) Disconnect the park/neutral position switch
connector.
(c) Measure the resistance according to the value(s) in
the table below when the shift lever is moved to
each position.
Resistance
ADJUSTMENT
1. ADJUST PARK/NEUTRAL POSITION SWITCH
ASSEMBLY
(a) Loosen the 2 bolts of the park/neutral position
switch and move the shift lever to the N position.
(b) Align the groove with the neutral basic line.
(c) Hold the switch in position and tighten the 2 bolts.
Torque: 5.4 N*m (55 kgf*cm, 48 in.*lbf)
(d) After adjustment, perform the inspection described
in park/neutral position switch assembly operation.
C110340E10
Shift Position Tester Connection Specified Condition
P
2 - 6 and 4 - 5Below 1
Except P 10 k or higher
R
2 - 1Below 1
Except R 10 k or higher
N
2 - 9 and 4 - 5Below 1
Except N 10 k or higher
D and 4
2 - 7Below 1
Except D and 4 10 k or higher
3
2 - 3Below 1
Except 3 10 k or higher
2 and L
2 - 8Below 1
Except 2 and L 10 k or higher
C099453E01

AX–20U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
AX
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.

U151F AUTOMATIC TRANSAXLE – VALVE BODY ASSEMBLYAX–141
AX
(c) Install the oil strainer with the 3 bolts.
Torque: 11 N*m (110 kgf*cm, 8 ft.*lbf)
3. INSTALL TRANSMISSION WIRE
(a) Coat the O-ring with ATF.
(b) Install the ATF temperature sensor with the lock
plate and bolt.
Torque: 6.6 N*m (67 kgf*cm, 58 in.*lbf)
(c) Connect the 7 shift solenoid valve connectors.
4. INSTALL AUTOMATIC TRANSAXLE OIL PAN SUB-
ASSEMBLY
(a) Install the 2 magnets in the oil pan.
(b) Apply seal packing or equivalent to the 18 bolts.
Seal packing:
THREE BOND 2430 or equivalent
(c) Install the oil pan and new gasket with the 18 bolts
to the transaxle case.
Torque: 7.8 N*m (80 kgf*cm, 69 in.*lbf)
NOTICE:
Tighten the bolts within 10 minutes of sealant
application.
5. CONNECT CABLE TO NEGATIVE BATTERY
TERMINAL
6. ADD AUTOMATIC TRANSAXLE FLUID
7. CHECK FLUID LEVEL IN AUTOMATIC TRANSAXLE
(See page AX-123)
8. INSTALL ENGINE UNDER COVER NO.1
9. RESET MEMORY
HINT:
(See page AX-16)
C091931
C091927E04
D030865
C091925

AX–22U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
AX
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

U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–29
AX
DIAGNOSIS SYSTEM
1. DESCRIPTION
(a) When troubleshooting OBD II vehicles, the only
difference from the usual troubleshooting procedure
is to connect an OBD II scan tool complying with
SAE J1987 or a intelligent tester to the vehicle, and
read off various data output from the vehicle's ECM.
(b) OBD II regulations require that the vehicle's on-
board computer illuminate the Malfunction Indicator
Lamp (MIL) on the instrument panel when the
computer detects a malfunction in the computer
itself or in the drive system components whic h affect
the vehicle emissions. In addition to illuminating the
MIL when a malfunction is detected, the applicable
DTCs prescribed by SAE J2012 are recorded in the
ECM memory (See page AX-35).
If the malfunction does not occur in 3 consecutive
trips, the MIL goes off but the DTCs remain in the
ECM memory.
(c) To check the DTCs, connect the OBD II scan tool or
intelligent tester to the DLC3 of the vehicle. The
OBD II scan tool or intelligent tester also enables
you to erase the DTCs and check freeze frame data
and various forms of engine data (For operating
instructions, see the instruction book).
(d) The DTCs include SAE controlled codes and
Manufacturer controlled codes. SAE controlled
codes must be set as prescribed by the SAE, while
Manufacturer controlled codes can be set freely by
a manufacturer within the prescribed limits (See
page AX-35).
(e) The diagnosis system operates in "normal mode"
during the normal vehicle use. In normal mode, "2-
trip detection logic" is used to ensure accurate
detection of malfunction. "Check mode" is also
available to technicians as an option. In check
mode, "1-trip detection logic" is used for simulating
malfunction symptoms and increasing the system's
ability to detect malfunctions, including intermittent
malfunction.
(f) *2 trip detection logic: When a malfunction is first
detected, the malfunction is temporarily stored in
the ECM memory (1st trip). If the ignition switch is
turned off and then turned to the ON position again,
and same malfunction is detected again, the MIL will
illuminate.
FI00534
C159873E01

U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–31
AX
HINT:
If your display shows UNABLE TO CONNECT TO
VEHICLE when you have connected the cable of
the OBD II scan tool or intelligent tester to the
DLC3, turned the ignition switch to the ON position
and operated the scan tool, there is a problem on
the vehicle side or tool side.
• If the communication is normal when the tool is
connected to another vehicle, inspect the DLC3
on the original vehicle.
• If the communication is still impossible when the
tool is connected to another vehicle, the problem
is probably in the tool itself, so consult the
Service Department listed in the tool's instruction
manual.
3. CHECK BATTERY VOLTAGE
(a) Measure the battery voltage.
Battery voltage:
11 to 14 V
If voltage is below 11 V, replace the battery before
proceeding.
4. CHECK MIL
(a) The MIL comes on when the ignition switch is
turned to the ON position and the engine is not
running.
HINT:
If the MIL does not light up, troubleshoot the
combination meter.
(b) When the engine is started, the MIL should go off. If
the lamp remains on, it means that the diagnosis
system has detected a malfunction or abnormality in
the system.

AX–168U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE ASSEMBLY
AX
INSTALLATION
1. INSTALL TORQUE CONVERTER CLUTCH
ASSEMBLY
(a) Install the torque converter clutch to the automatic
transaxle.
(b) Using vernier calipers and a straight edge, measure
the dimension "A" between the transaxle fitting part
of the engine and the converter fitting part of the
drive plate (*1).
(c) Using vernier calipers and a straight edge, measure
the dimension "B" shown in the illustration and
check that "B" is greater than "A" (measured in step
(*1)).
Standard:
A + 1 mm (0.03937 in.) or more
NOTICE:
Remember to minus the thickness of the
straight edge.
2. INSTALL TRANSFER ASSEMBLY
HINT:
(See page TF-9)
3. INSTALL AUTOMATIC TRANSAXLE W/TRANSFER
(a) Install the automatic transaxle w/transfer with the 10
bolts to the engine.
To r q u e : B o l t A
64 N*m (650 kgf*cm, 47 ft.*lbf)
Bolt B
46 N*m (470 kgf*cm, 34 ft.*lbf)
Bolt C
43 N*m (439 kgf*cm, 32 ft.*lbf)
(b) Apply a few drops of adhesive to each of 2 threads
on the tip of the 6 torque converter clutch mounting
bolts.
Adhesive:
Part No. 08833-00070, THREE BOND 1324
or equivalent
D031087E01
C065911E01
C163047E01

TRANSFER – TRANSFER ASSEMBLYTF–9
TF
INSTALLATION
1. INSTALL TRANSFER ASSEMBLY
(a) Apply sealant 1281 to the transaxle assembly and
transfer assembly in continuous beaded from of 1.2
mm diameter as shown in the illustration.
NOTICE:
• Wipe any grease off from the attaching
surfaces.
• Install it within 10 minutes after applying the
sealant.
• Sealant stuck on the gasket, case oil seal and
driving plug may cause oil leakage and
seizure due to oil shortage. Care must be
taken.
(b) Install the transfer assembly to the transaxle
assembly with the 2 bolts and 6 nuts.
Torque: 69 N*m (700 kgf*cm, 51 ft.*lbf)
NOTICE:
• Check that the gasket is installed to the
transfer assembly before installing them to
the transaxle assembly.
• Install the transfer assembly to the transaxle
assembly without tilting.
• When moving the transfer assembly, do not
hold the oil seal on the both sides.
2. INSTALL AUTOMATIC TRANSMISSION WITH
TRANSFER
HINT:
(See page AX-167)
3. INSTALL ENGINE AND TRANSAXLE
HINT:
(See page EM-44)
4. INSTALL TRANSFER DRAIN PLUG
(a) Install the transfer drain plug with a new drain
gasket.
Torque: 49 N*m (500 kgf*cm, 36 ft.*lbf)
5. INSTALL NO. 2 TRANSFER CASE PLUG
(a) Install the No. 2 transfer case plug with a new No. 2
gasket.
Torque: 49 N*m (500 kgf*cm, 36 ft.*lbf)
C083714E01
C082785
C082977E01