2007 TOYOTA SIENNA check engine

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

BC–4BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM
BC
TEST MODE PROCEDURE
1. SPEED SENSOR SIGNAL CHECK (WHEN USING SST
CHECK WIRE):
HINT:
• If the ignition switch is turned from the ON to the ACC
or LOCK position during Test Mode, the DTCs of the
signal check function will be erased.
(a) Turn the ignition switch off.
(b) Check that the steering wheel is in the straight-
ahead position and move the shift lever to the P
position (Automatic Transmission) or apply the
parking brake (Manual Transmission).
(c) Using SST, connect terminals TS and CG of the
DLC3.
SST 09843-18040
(d) Turn the ignition switch to the ON position.
(e) Check that the ABS warning light is blinking in the
Test Mode.
HINT:
If the ABS warning light does not blink, inspect the
TS and CG terminal circuit and the ABS warning
light circuit.
(f) Start the engine.
(g) Using SST, perform the speed sensor signal check
in Test Mode.
SST 09843-18040
(h) Drive the vehicle straight forward.
(i) Accelerate the vehicle to a speed of 28 mph (45 km/
h) or higher for several seconds and check that the
ABS warning light goes off.
HINT:
The signal check may not be completed if the
vehicle has its wheels spun.
(j) Stop the vehicle.
NOTICE:
• The speed sensor signal check may not be
completed if the steering wheel is turned or
the wheels are spun during the check.
G022987E07
BR03904E13
Trouble Area See procedure
TS and CG terminal circuitBC-64
ABS warning light circuitBC-47 or BC-50

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEMBC–7
BC
(f) Check that the ABS warning light is blinking in the
Test Mode.
HINT:
If the ABS warning light does not blink, inspect the
TS and CG terminal circuit and the ABS warning
light circuit.
(g) Start the engine.
(h) Using the intelligent tester, perform the speed
sensor signal check in Test Mode.
(i) Drive the vehicle straight forward.
(j) Accelerate the vehicle to a speed of 28 mph (45 km/
h) or higher for several seconds and check that the
ABS warning light goes off.
HINT:
The signal check may not be completed if the
vehicle has its wheels spun.
(k) Stop the vehicle.
NOTICE:
• The speed sensor signal check may not be
completed if the steering wheel is turned or
the wheels are spun during the check.
• After the ABS warning light goes off and if
vehicle speed exceeds 50 mph (80 km/h), a
signal check code will be stored again.
Decelerate or stop the vehicle before the
speed reaches 50 mph (80 km/h).
• If the signal check has not been completed,
the ABS warning light blinks while driving
and the ABS system does not operate.
HINT:
When the signal check has been completed, the
ABS warning light goes off while driving and blinks
in the Test Mode pattern while stationary.
5. READ DTC
(a) Read the DTC(s) by following the tester screen.
HINT:
• Refer to the intelligent tester operator's manual
for further details.
• See the list of DTC.
6. DTC OF TEST MODE (SIGNAL CHECK) FUNCTION
BR03904E13
Trouble Area See procedure
TS and CG terminal circuitBC-64
ABS warning light circuitBC-47 or BC-50
Code No. Diagnosis Trouble Area
C1271/71 Low output signal of front speed sensor RH• Front speed sensor RH
• Sensor installation
• Speed sensor rotor
C1272/72 Low output signal of front speed sensor LH• Front speed sensor LH
• Sensor installation
• Speed sensor rotor
C1273/73 Low output signal of rear speed sensor RH• Rear speed sensor RH
• Sensor installation
• Speed sensor rotor