TOYOTA SIENNA 2007 Service Repair Manual

U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–99
AX
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
COMPONENT OPERATING RANGE
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Using the intelligent tester to read the DATA LIST allows the values or states of switches, sensors,
actuators and other items to be read without removing any parts. This non-intrusive inspection can be
very useful because intermittent conditions or signals may be discovered before parts or wiring is
disturbed. Reading the DATA LIST information early in troubleshooting is one way to save diagnostic time.
1. READ DATA LIST
(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 / DATA LIST".
The monitor will run whenever this DTC is not present.P0500 (VSS)
P0748, P0778, P0798 (Shift solenoid valve(range))
EngineRunning
NSW (STAR) switchOFF
Output shaft rpm1,000 rpm or more
Battery voltage8 V or more
Ignition switchON
Sta r t e rOFF
Sensor signal rpmLess than 300 rpm
Counter gear speed sensor (NC)HINT:
3rd when shift lever position is D position (After warming up the engine);
• Intermediate shaft speed (NC) becomes close to the engine speed.
G031763E75

AX–100U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
AX
(g) According to the display on the tester, read the "DATA LIST".
HINT:
• SPD (NC) is always 0 while driving:
Open or short in the sensor or circuit.
• SPD (NC) is always more than 0 and less than 300 rpm while driving the vehicle at 50 km/h (31 mph)
or more:
Sensor trouble, improper installation, or intermittent connection trouble of the circuit.
(a) Check the speed sensor installation.
OK:
The installation bolt is tightened properly and there
is no clearance between the sensor and transaxle
case.
NG
OK
(a) Disconnect the speed sensor connector from the
transaxle.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
Tester Display Measurement Item/Range Normal Condition Diagnostic Note
SPD (NC)Counter Gear Speed/
display: 50 r/minHINT:
3rd when shift lever position is D
position (After warming up the
engine);
• Intermediate shaft speed
(NC) becomes close to the
engine speed.-
1INSPECT SPEED SENSOR INSTALLATION
BR03795E35
REPLACE SPEED SENSOR (NC)
2INSPECT SPEED SENSOR (NC)
C110343E26
Tester ConnectionSpecified Condition
20 C (68 F)
1 - 2 560 to 680
REPLACE SPEED SENSOR (NC)

U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–101
AX
(a) Connect the speed sensor connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance
(d) Measure the resistance according to the value(s) in the
table below.
Standard resistance (Check for short)
NG
OK
3CHECK HARNESS AND CONNECTOR (SPEED SENSOR - ECM)
C160512E03
Tester ConnectionSpecified Condition
20 C (68 F)
E10-34 (NC+) - E10-26 (NC-) 560 to 680
Tester Connection Specified Condition
E10-34 (NC+) - Body ground
10 k
or higher
E10-26 (NC-) - Body ground
REPAIR OR REPLACE HARNESS OR
CONNECTOR
REPLACE ECM

AX–102U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
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
troubles of the shift solenoid valves and valve body.
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 and stores the DTC.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
All:
DTC P0796Pressure Control Solenoid "C" Performance
(Shift Solenoid Valve SL3)
DTC No. DTC Detection Condition Trouble Area
P0796The gear required by the ECM does not match the
actual gear when driving (2-trip detection logic)• Shift solenoid valve SL3 remains open or closed
• Valve body is blocked
• Automatic transaxle (clutch, brake or gear etc.)
Related DTCsP0796:
Shift solenoid valve SL3/OFF malfunction
Shift solenoid valve SL3/ON malfunction
Required sensors/ComponentsShift solenoid valve SL3, Speed sensor (NT), Speed sensor (NC), Crankshaft
position sensor (NE)
Frequency of operation Continuous
DurationOFF malfunction (A)
0.8 sec.
OFF malfunction (B)
1 sec.
ON malfunction (A) and (B)
0.8 sec.
ON malfunction (C)
0.4 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

U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–103
AX
OFF malfunction (A):
OFF malfunction (B):
ON malfunction (A):
ON malfunction (B):
ON malfunction (C):
TYPICAL MALFUNCTION THRESHOLDS
Either of the following conditions is met: OFF malfunction (A) and (B), or ON malfunctions (A), (B)
and (C)
2 detections are necessary per driving cycle:
1st detection; temporary flag ON
2nd detection; pending fault code ON
OFF malfunction (A):
OFF malfunction (B):
ON malfunction (A):
ON malfunction (B):
ON malfunction (C):
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 system Not circuit malfunction
ECM selected gear4th or 5th
Throttle valve opening angle4.5% or more at engine speed 1,900 rpm
(Varies with engine speed)
ECM selected gear4th
Throttle valve opening angle 5% or more
Vehicle speed10 km/h (6.2 mph) or more
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 gear3rd
Throttle valve opening angle5.0% or more at output speed 1,400 rpm
(Varies with engine speed)
Malfunction of pressure control solenoid "B" (SL2) and "C"
(SL3)Not detected
Throttle valve opening angle5.0% or more at output speed 1,050 rpm
(Varies with engine speed)
Malfunction of pressure control solenoid "B" (SL2) Not detected
Input (turbine) speed/Intermediate shaft speed 0.93 to 1.07
Intermediate shaft speed/Output speed 1.02 to 1.16
Input (turbine) speed/Intermediate shaft speed 0.93 to 1.07
Input (turbine) speed - Intermediate shaft speed 700 rpm or more
Input (turbine) speed - Intermediate shaft speedLess than -500 rpm
or
700 rpm or more

AX–104U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
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 / 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.
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
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 P0796)
Result Proceed to
P0796 A
P0796 and other DTCs B

U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–105
AX
HINT:
If any other codes besides "P0796" are output, perform
the troubleshooting for those DTCs first.
B
A
(a) Remove the shift solenoid valve SL3.
(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.
NGGO TO DTC CHART
2INSPECT SHIFT SOLENOID VALVE SL3
G020767E81
Tester ConnectionSpecified Condition
20C (68F)
1 - 2 5.0 to 5.6
REPLACE SHIFT SOLENOID VALVE SL3
3INSPECT TRANSMISSION VALVE BODY ASSEMBLY
REPAIR OR REPLACE TRANSMISSION
VALVE BODY ASSEMBLY
4INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY
REPLACE TORQUE CONVERTER CLUTCH
ASSEMBLY

AX–106U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
AX
OK
REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY

U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–107
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 P0798Pressure Control Solenoid "C" Electrical (Shift
Solenoid Valve SL3)
DTC No. DTC Detection Condition Trouble Area
P0798The ECM checks for an open or short in the shift
solenoid valve SL3 circuit while driving and shifting
gears.
(1-trip detection logic)
– Output signal duty equals to 100 %.
(NOTE: SL3 output signal duty is less than 100 %
under normal condition.)• Open or short in shift solenoid valve SL3 circuit
• Shift solenoid valve SL3
•ECM
Related DTCs P0798: Shift solenoid valve SL3/Range check
Required sensors/Components Shift solenoid valve SL3
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–108U151F 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 (SL3)
G031765E60
C113969E05
Tester ConnectionSpecified Condition
20C (68F)
4 (SL3+) - 11 (SL3-) 5.0 to 5.6
Tester Connection Specified Condition
4 (SL3+) - Body ground 10 k
or higher
11 (SL3-) - Body ground
Go to step 3