2007 TOYOTA SIENNA automatic transmission

U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–115
AX
TYPICAL MALFUNCTION THRESHOLDS
P0985: Range check (Low resistance):
P0986: Range check (High resistance):
COMPONENT OPERATING RANGE
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
NG
OK
Shift solenoid valve SR resistance 8 or less
Shift solenoid valve SR resistance 100 k
or more
Shift solenoid valve SR Resistance: 11 to 15
at 20C (68F)
1INSPECT TRANSMISSION WIRE (SR)
G031165E83
C113969E08
Tester ConnectionSpecified Condition
20C (68F)
9 (SR) - Body ground 11 to 15
Go to step 3

AX–116U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
AX
(a) Connect the transmission wire connector to the
transaxle.
(b) Disconnect the connector from the ECM.
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
(a) Remove the shift solenoid valve SR.
(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 makes an operating sound.
NG
OK
2CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)
C160512E06
Tester ConnectionSpecified Condition
20C (68F)
E10-9 (SR) - Body ground 11 to 15
REPAIR OR REPLACE HARNESS OR
CONNECTOR
REPLACE ECM
3INSPECT SHIFT SOLENOID VALVE SR
C113977E05
Tester ConnectionSpecified Condition
20C (68F)
Solenoid Connector (SR) - Solenoid
Body (SR)11 to 15
REPLACE SHIFT SOLENOID VALVE SR
REPAIR OR REPLACE TRANSMISSION WIRE

U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–117
AX
SYSTEM DESCRIPTION
The linear solenoid valve (SLT) controls the transmission line pressure for smooth transmission operation
based on signals from the throttle position sensor and the vehicle speed sensor. The ECM adjusts the
duty ratio (*) of the SLT solenoid valve to control hydraulic line pressure coming from the primary regulator
valve. Appropriate line pressure assures smooth shifting with varying engine outputs.
(*): Duty Ratio
The duty ratio is the ratio of the period of continuity in one cycle. For example, if A is the period of
continuity in one cycle, and B is the period of non-continuity, then
Duty Ratio=A/(A+B) x 100(%)
DTC P2714Pressure Control Solenoid "D" Performance
(Shift Solenoid Valve SLT)
DTC No. DTC Detection Condition Trouble Area
P2714ECM detects a malfunction on SLT (ON side) according
to the revolution difference of the turbine, intermediate
and the output shaft, and also by the oil pressure. (2-
trip detection logic)• Shift solenoid valve SLT remains closed
• Valve body is blocked
• Automatic transaxle (clutch, brake or gear, etc.)
C108924E02

AX–118U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
AX
MONITOR DESCRIPTION
In any forward position, when the difference between the revolutions of the turbine, Intermediate and
output shaft exceeds the specified value (varies with Intermediate, output speed) determined by the ECM,
the ECM illuminates the MIL and store the DTC.
When shift solenoid valve SLT remains on, the oil pressure goes down and the clutch engagement force
decreases.
NOTICE:
If you continue driving under these conditions, the clutch will burn out and the vehicle will no
longer be drivable.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
ON malfunction:
ON malfunction (A):
Related DTCs P2714: Shift solenoid valve SLT/ON malfunction
Required sensors/ComponentsShift solenoid valve SLT, Speed sensor (NT), Speed sensor (NC),
Crankshaft position sensor (NE)
Frequency of operation Continuous
Duration 0.5 sec.
MIL operation 2 driving cycles
Sequence of operation None
The monitor will run whenever this DTC is not present. None
Transmission range"D"
TFT (Transmission fluid temperature) -20
C (-4F) or more
TFT sensor circuitNot circuit malfunction
Turbine speed sensor circuit Not circuit malfunction
Intermediate shaft speed sensor circuit Not circuit malfunction
Output speed sensor circuitNot circuit malfunction
Shift solenoid valve SL1 circuit Not circuit malfunction
Shift solenoid valve SL2 circuit Not circuit malfunction
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
Shift solenoid valve SLT circuit Not circuit malfunction
Electronic throttle systemNot circuit malfunction
ECM selected gear 1st
Temporary MAIN gear 1st or 2nd or 3rd or 4th
NT - NC x Temporary MAIN gear ratio
NT: Input (turbine) speed
NC: Intermediate shaft speed100 rpm or more at Intermediate shaft speed 1,000 rpm
Temporary U/D gear Low
NC - NO x Temporary U/D gear ratio
NO: Output speed300 rpm or more at Output speed 1,000 rpm
TT
TT: Turbine Torque900 Nm or more
NT 250 rpm or more
NC 250 rpm or more
NO 250 rpm or more

U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–121
AX
Result
HINT:
If any other codes besides "P2714" are output, perform the
troubleshooting for those DTCs first.
B
A
(a) Remove the shift solenoid valve SLT.
(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.
NG
OK
OK:
The torque converter clutch operates normally.
Result Proceed to
P2714 A
P2714 and other DTCs B
GO TO DTC CHART
2INSPECT SHIFT SOLENOID VALVE SLT
G020767E82
Tester ConnectionSpecified Condition
20C (68F)
1-2 5.0 to 5.6
REPLACE SHIFT SOLENOID VALVE SLT
3INSPECT TRANSMISSION VALVE BODY ASSEMBLY
REPAIR OR REPLACE TRANSMISSION
VALVE BODY ASSEMBLY
4INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY

U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–123
AX
DESCRIPTION
The linear solenoid valve (SLT) controls the transmission line pressure for smooth transmission operation
based on signals from the throttle position sensor and the vehicle speed sensor. The ECM adjusts the
duty cycle of the SLT solenoid valve to control hydraulic line pressure coming from the primary regulator
valve. Appropriate line pressure assures smooth shifting with varying engine outputs.
(*): Duty Ratio
The duty ratio is the ratio of the period of continuity in one cycle.
For example, if A is the period of continuity in one cycle, and B is the period of non-continuity, then
Duty Ratio = A/(A + B) x 100(%)
MONITOR DESCRIPTION
When an open or short in the linear solenoid valve (SLT) circuit is detected, the ECM interprets this as a
fault. The ECM will turn on the MIL and store the DTC.
MONITOR STRATEGY
DTC P2716Pressure Control Solenoid "D" Electrical (Shift
Solenoid Valve SLT)
DTC No. DTC Detection Condition Trouble Area
P2716Open or short is detected in shift solenoid valve SLT
circuit for 1 second or more while driving (1-trip
detecting logic).• Open or short in shift solenoid valve SLT circuit
• Shift solenoid valve SLT
•ECM
Related DTCs P2716: Shift solenoid valve SLT/Range check
Required sensors/Components Shift solenoid valve SLT
Frequency of operation Continuous
Duration 1 sec.
MIL operation Immediate
Sequence of operation None
C114295E01

U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–125
AX
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
(a) Connect the transmission wire connector to the
transaxle.
(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
1INSPECT TRANSMISSION WIRE (SLT)
C113969E10
Tester ConnectionSpecified Condition
20C (68F)
2 (SLT+) - 8 (SLT-) 5.0 to 5.6
Tester Connection Specified Condition
2 (SLT+) - Body ground 10 k
or higher
8 (SLT-) - Body ground
Go to step 3
2CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)
C160512E07
Tester ConnectionSpecified Condition
20C (68F)
E10-13 (SLT+) - E10-12 (SLT-) 5.0 to 5.6
Tester Connection Specified Condition
E10-13 (SLT+) - Body ground
10 k
or higher
E10-12 (SLT-) - Body ground
REPAIR OR REPLACE HARNESS OR
CONNECTOR
REPLACE ECM

AX–126U151E AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
AX
(a) Remove the shift solenoid valve (SLT).
(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
3INSPECT SHIFT SOLENOID VALVE SLT
G020767E82
Tester ConnectionSpecified Condition
20C (68F)
1 - 2 5.0 to 5.6
REPLACE SHIFT SOLENOID VALVE SLT
REPAIR OR REPLACE TRANSMISSION WIRE