TOYOTA SIENNA 2007 Service Repair Manual

U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–69
AX
INSPECTION PROCEDURE
HINT:
Using the intelligent tester to perform ACTIVE TEST allows relays, VSVs, actuators and other items to be
operated without removing any parts. This non-intrusive functional inspection can be very useful because
intermittent operation may be discovered before parts or wiring is disturbed. Performing ACTIVE TEST
early in troubleshooting is one way to save diagnostic time. DATA LIST information can be displayed while
performing ACTIVE TEST.
1. PERFORM ACTIVE TEST
(a) Warm up the engine.
(b) Turn the ignition switch off.
(c) Connect the intelligent tester together with the CAN VIM (controller area network vehicle
interface module) to the DLC3.
(d) Turn the ignition switch to the ON position.
(e) Turn on the tester.
(f) Select the item "DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST".
(g) According to the display on the tester, perform the "ACTIVE TEST".
HINT:
• This test can be conducted when the vehicle speed is 60 km/h (37 mph) or more.
• This test can be conducted in the 5th gear.
(h) Lightly depress the accelerator pedal and check that the engine speed does not change
abruptly.
HINT:
• When changing the accelerator pedal opening angle while driving, if the engine speed does
not change, lock-up is on.
• Slowly release, but not fully, the accelerator pedal in order to decelerate. (Fully releasing the
pedal will close the throttle valve and lock-up may be turned off.)
Tester Display Test Part Control Range Diagnostic Note
LOCK UP[Test Details]
Control the shift solenoid DSL to set the automatic
transaxle to the lock-up condition.
[Vehicle Condition]
• Throttle valve opening angle: Less than 35 %
• Vehicle Speed: 60 km/h (37 mph) or more, and
5th gearON/OFFPossible to check the DSL
operation.
G029214E02

AX–70U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
AX
(a) Connect the intelligent tester together with the CAN VIM
(controller area network vehicle interface module) to the
DLC3.
(b) Turn the ignition switch to the ON position and turn the
OBD II scan tool or the intelligent tester main switch ON.
(c) When you use intelligent tester:
Select the item "DIAGNOSIS / ENHANCED OBD II /
DTC INFO / CURRENT CODES".
(d) Read the DTCs using the OBD II scan tool or the
intelligent tester.
Result
HINT:
If any other codes besides "P0741" are output, perform
the troubleshooting for those DTCs first.
B
A
(a) Disconnect the transmission wire connector from the
transaxle.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
1CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0741)
Result Proceed to
P0741 A
P0741 and other DTCs B
GO TO DTC CHART
2INSPECT TRANSMISSION WIRE (DSL)
C113969E02
Tester ConnectionSpecified Condition
20C (68F)
10 (DSL) - Body ground 11 to 13
Go to step 4

U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–71
AX
(a) Connect the transmission wire connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
(a) Remove the shift solenoid valve DSL.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
(c) Connect the positive (+) lead to the terminal of the
solenoid connector, and the negative (-) lead to the
solenoid body.
OK:
The solenoid valve makes an operating sound.
NG
OK
OK:
The connectors and pins are securely installed.
There is no open or short on the wire harness.
NG
OK
3CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)
C152056E03
Tester ConnectionSpecified Condition
20C (68F)
E10-11 (DSL) - Body ground 11 to 13
REPAIR OR REPLACE HARNESS OR
CONNECTOR
4INSPECT SHIFT SOLENOID VALVE DSL
C113970E08
Tester ConnectionSpecified Condition
20C (68F)
Solenoid Connector (DSL) - Solenoid
Body (DSL)11 to 13
REPLACE SHIFT SOLENOID VALVE DSL
5CHECK TRANSMISSION WIRE
REPAIR OR REPLACE TRANSMISSION
WIRE

AX–72U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
AX
OK:
There are no foreign objects on each valve and they
operate smoothly.
NG
OK
OK:
The torque converter clutch operates normally.
NG
OK
6INSPECT TRANSMISSION VALVE BODY ASSEMBLY
REPAIR OR REPLACE TRANSMISSION
VALVE BODY ASSEMBLY
7INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY
REPLACE TORQUE CONVERTER CLUTCH
ASSEMBLY
REPAIR AUTOMATIC TRANSAXLE ASSEMBLY

U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–73
AX
SYSTEM DESCRIPTION
The ECM uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd, 4th
or 5th gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical
problems of the shift solenoid valves, valve body or automatic transaxle (clutch, brake or gear etc.).
MONITOR DESCRIPTION
The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF". According to the input
shaft revolution, intermediate (counter) shaft revolution and output shaft revolution, the ECM detects the
actual gear position (1st, 2nd, 3rd, 4th or 5th gear position). When the gear position commanded by the
ECM and the actual gear position are not the same, the ECM illuminates the MIL.
HINT:
Example:
When either condition (a) or (b) is met, the ECM detects a malfunction.
(a) The ECM commands the 1st gear, but the actual gear is 2nd.
(b) The ECM commands the 2nd gear, but the actual gear is 1st.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
ALL:
DTC P0746Pressure Control Solenoid "A" Performance
(Shift Solenoid Valve SL1)
DTC No. DTC Detection Condition Trouble Area
P0746The gear required by the ECM does not match the
actual gear when driving (2-trip detection logic)• Shift solenoid valve SL1 remains open or closed
• Valve body is blocked
• Automatic transaxle (clutch, brake or gear etc.)
Related DTCsP0746:
Shift solenoid valve SL1/OFF malfunction
Shift solenoid valve SL1/ON malfunction
Required sensors/ComponentsShift solenoid valve SL1, Speed sensor (NT), Speed sensor (NC), Crankshaft
position sensor (NE)
Frequency of operation Continuous
Duration 0.8 sec.
MIL operation 2 driving cycles
Sequence of operation None
The monitor will run whenever this DTC is not present.P0115 - P0118 (ECT sensor)
P0125 (Insufficient ECT for closed loop)
P0500 (VSS)
P0748, P0778, P0798 (Shift solenoid valve (range))
ECT (Engine coolant temperature) 10
C (50F) or more
Transmission range"D"
TFT (Transmission fluid temperature) -20
C (-4F) or more
TFT sensor circuitNot circuit malfunction
ECT sensor circuitNot circuit malfunction
Turbine speed sensor circuit Not circuit malfunction
Intermediate shaft speed sensor circuit Not circuit malfunction
Output speed sensor circuit Not circuit malfunction
Shift solenoid valve SL1 circuit Not circuit malfunction
Shift solenoid valve SL2 circuit Not circuit malfunction

AX–74U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
AX
OFF malfunction:
ON malfunction:
TYPICAL MALFUNCTION THRESHOLDS
Either of the following conditions is met: OFF malfunction or ON malfunction
OFF malfunction:
2 detections are necessary per driving cycle:
1st detection; temporary flag ON
2nd detection; pending fault code ON
ON malfunction:
INSPECTION PROCEDURE
HINT:
Using the intelligent tester to perform ACTIVE TEST allows relays, VSVs, actuators and other items to be
operated without removing any parts. This non-intrusive functional inspection can be very useful because
intermittent operation may be discovered before parts or wiring is disturbed. Performing ACTIVE TEST
early in troubleshooting is one way to save diagnostic time. DATA LIST information can be displayed while
performing ACTIVE TEST.
1. PERFORM ACTIVE TEST
(a) Warm up the engine.
(b) Turn the ignition switch off.
(c) Connect the intelligent tester together with the CAN VIM (controller area network vehicle
interface module) to the DLC3.
(d) Turn the ignition switch to the ON position.
(e) Turn on the tester.
(f) Select the item "DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / SHIFT".
(g) According to the display on the tester, perform the "ACTIVE TEST".
HINT:
While driving, the shift position can be forcibly changed with the intelligent tester.
Shift solenoid valve SL3 circuit Not circuit malfunction
Shift solenoid valve S4 circuit Not circuit malfunction
Shift solenoid valve SR circuit Not circuit malfunction
Shift solenoid valve DSL circuit Not circuit malfunction
Electronic throttle systemNot circuit malfunction
ECM selected gear1st
Vehicle speedLess than 40 km/h (24.9 mph)
Throttle valve opening angle4.5% or more at engine speed 1,900 rpm
(Varies with engine speed)
ECM selected gear2nd
Throttle valve opening angle4.5% or more at engine speed 1,900 rpm
(Varies with engine speed)
Input (turbine) speed/Intermediate shaft speed 1.49 to 1.63
Input (turbine) speed/Intermediate shaft speed 2.72 to 2.86

U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–75
AX
Comparing the shift position commanded by the ACTIVE TEST with the actual shift position enables you
to confirm the problem (See page AX-30).
HINT:
• This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.
• The shift position commanded by the ECM is shown in the DATA LIST/SHIFT display on the intelligent
tester.
(a) Connect the intelligent tester together with the CAN VIM
(controller area network vehicle interface module) to the
DLC3.
(b) Turn the ignition switch to the ON position and turn the
OBD II scan tool or the intelligent tester main switch ON.
(c) When you use intelligent tester:
Select the item "DIAGNOSIS / ENHANCED OBD II /
DTC INFO / CURRENT CODES".
(d) Read the DTCs using the OBD II scan tool or the
intelligent tester.
Result
HINT:
If any other codes besides "P0746" are output, perform
the troubleshooting for those DTCs first.
B
A
Tester Display Test Part Control Range Diagnostic Note
SHIFT[Test Details]
Operate the shift solenoid valve and set the each
shift position by yourself.
[Vehicle Condition]
• IDL: ON
• Less than 50 km/h (31 mph)
[Others]
• Press "
" button: Shift up
• Press "
" button: Shift down1st/2nd/3rd/4th/5thPossible to check the
operation of the shift
solenoid valves.
1CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0746)
Result Proceed to
P0746 A
P0746 and other DTCs B
GO TO DTC CHART

AX–76U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
AX
(a) Remove the shift solenoid valve SL1.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
(c) Connect the positive (+) lead with a 21 W bulb to
terminal 2 and the negative (-) lead to terminal 1 of the
solenoid valve connector, then check the movement of
the valve.
OK:
The solenoid makes an operating sound.
NG
OK
OK:
There are no foreign objects on each valve and they
operate smoothly.
NG
OK
OK:
The torque converter clutch operates normally.
NG
OK
2INSPECT SHIFT SOLENOID VALVE SL1
G020767E79
Tester ConnectionSpecified Condition
20C (68F)
1 - 2 5.0 to 5.6
REPLACE SHIFT SOLENOID VALVE SL1
3INSPECT TRANSMISSION VALVE BODY ASSEMBLY
REPAIR OR REPLACE TRANSMISSION
VALVE BODY ASSEMBLY
4INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY
REPLACE TORQUE CONVERTER CLUTCH
ASSEMBLY
REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY

U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–77
AX
DESCRIPTION
Shifting from 1st to 5th is performed in combination with "ON" and "OFF" operation of the shift solenoid
valves SL1, SL2, SL3, S4 and SR which are controlled by the ECM. If an open or short circuit occurs in
either of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow
the vehicle to be operated smoothly (Fail safe function).
MONITOR DESCRIPTION
The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF". When there is an open or
short circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and
stores the DTC. And the ECM performs the fail-safe function and turns the other normal shift solenoid
valves "ON/OFF" (In case of an open or short circuit, the ECM stops sending current to the circuit.)
(See page AX-30).
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
COMPONENT OPERATING RANGE
DTC P0748Pressure Control Solenoid "A" Electrical (Shift
Solenoid Valve SL1)
DTC No. DTC Detection Condition Trouble Area
P0748The ECM checks for an open or short in the shift
solenoid valve SL1 circuit while driving and shift gears.
(1-trip detection logic)
• Output signal duty equals to 100 %.
(NOTE: SL1 output signal duty is less than 100 %
under normal condition.)• Open or short in shift solenoid valve SL1 circuit
• Shift solenoid valve SL1
•ECM
Related DTCs P0748: Shift solenoid valve SL1/Range check
Required sensors/Components Shift solenoid valve SL1
Frequency of operation Continuous
Duration 1 sec.
MIL operation Immediate
Sequence of operation None
The monitor will run whenever this DTC is not present. None
Battery voltage10 V or more
Ignition switchON
Sta r t e rOFF
Output signal duty100%
Output signal dutyLess than 100%

AX–78U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
AX
WIRING DIAGRAM
INSPECTION PROCEDURE
(a) Disconnect the transmission wire connector from the
transaxle.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance (Check for short)
NG
OK
1INSPECT TRANSMISSION WIRE (SL1)
G031765E58
C113969E03
Tester ConnectionSpecified Condition
20C (68F)
6 (SL1+) - 13 (SL1-) 5.0 to 5.6
Tester Connection Specified Condition
6 (SL1+) - Body ground 10 k
or higher
13 (SL1-) - Body ground
Go to step 3