sensor TOYOTA SIENNA 2007 Service Repair Manual

U151F 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

U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–127
AX
DESCRIPTION
The shift solenoid valve DSL is turned "ON" and "OFF" by signals from the ECM in order to control the
hydraulic pressure operation, the lock-up relay valve, which then controls operation of the lock-up clutch.
MONITOR DESCRIPTION
Torque converter lock-up is controlled by the ECM based on engine rpm, engine load, engine
temperature, vehicle speed, transmission temperature, and shift range selection. The ECM determines
the lock-up status of the torque converter by comparing the engine rpm (NE) to the input turbine rpm (NT).
The ECM calculates the actual transmission gear by comparing input turbine rpm (NT) to counter gear
rpm (NC). When conditions are appropriate, the ECM requests "lock-up" by applying control voltage to the
shift solenoid DSL. When the DSL is opened, it applies pressure to the lock-up relay valve and locks the
torque converter clutch. If the ECM detects an open or short in the DSL solenoid circuit, the ECM
interprets this as a fault in the DSL solenoid or circuit. The ECM will turn on the MIL and store the DTC.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
P2769: Range check (Low resistance):
P2770: Range check (High resistance):
DTC P2769Torque Converter Clutch Solenoid Circuit Low
(Shift Solenoid Valve DSL)
DTC P2770Torque Converter Clutch Solenoid Circuit High
(Shift Solenoid Valve DSL)
DTC No. DTC Detection Condition Trouble Area
P2769ECM detects short in solenoid valve DSL circuit (0.1
sec.) when solenoid valve DSL is operated (2-trip
detection logic)• Short in shift solenoid valve DSL circuit
• Shift solenoid valve DSL
•ECM
P2770ECM detects open in solenoid valve DSL circuit (0.1
sec.) when solenoid valve DSL is not operated (2-trip
detection logic)• Open in shift solenoid valve DSL circuit
• Shift solenoid valve DSL
•ECM
Related DTCsP2769: Shift solenoid valve DSL/Range check (Low resistance)
P2770: Shift solenoid valve DSL/Range check (High resistance)
Required sensors/Components Shift solenoid valve DSL
Frequency of operation Continuous
Duration 0.064 sec. or more
MIL operation 2 driving cycles
Sequence of operation None
The monitor will run whenever this DTC is not present. None
Shift solenoid valve DSLON
Solenoid current cut status Not cut
Battery voltage8 V or more
Ignition switchON
Sta r t e rOFF
The monitor will run whenever this DTC is not present. None
Shift solenoid valve DSLON
Battery voltage8 V or more
Ignition switchON

U151F AUTOMATIC TRANSAXLE – TRANSMISSION WIREAX–131
AX
REMOVAL
1. DISCONNECT CABLE FROM NEGATIVE BATTERY
TERMINAL
2. REMOVE ENGINE UNDER COVER NO.1
3. DRAIN AUTOMATIC TRANSAXLE FLUID
(a) Remove the drain plug and gasket, and drain the
AT F.
(b) Install a new gasket and the drain plug.
Torque: 49 N*m (500 kgf*cm, 36 ft.*lbf)
4. REMOVE AUTOMATIC TRANSAXLE OIL PAN SUB-
ASSEMBLY
(a) Remove the 18 bolts, oil pan and gasket.
NOTICE:
Some fluid will remain in the oil pan. Carefully
remove the oil pan so that fluid remaining in the
pan does not spill out.
(b) Remove the 2 magnets from the oil pan.
(c) Examine particles in the pan.
(1) Collect any steel chips using the removed
magnets. Look carefully at the chips and
particles in the pan and on the magnets to see
the type of wear which might be found in the
transaxle.
Result:
Steel (magnetic):
Wear of the bearing, gear or plate
Brass (non-magnetic):
Wear of the bearing
5. DISCONNECT TRANSMISSION WIRE
(a) Disconnect the 7 shift solenoid valve connectors.
(b) Remove the bolt and lock plate, and disconnect the
ATF temperature sensor.
C091925
D030865
AT00103
C091927E04

AX–132U151F AUTOMATIC TRANSAXLE – TRANSMISSION WIRE
AX
6. REMOVE TRANSMISSION WIRE
(a) Disconnect the transmission wire connector.
(b) Remove the bolt and transmission wire.
(c) Remove the O-ring from the transmission wire.
INSTALLATION
1. INSTALL TRANSMISSION WIRE
(a) Coat the O-ring of the transmission wire connector
with ATF and install it.
(b) Install the transmission wire with the bolt.
Torque: 5.4 N*m (55 kgf*cm, 48 ft.*lbf)
2. CONNECT TRANSMISSION WIRE
(a) Coat the O-ring of the ATF temperature sensor with
AT F.
(b) Install the ATF temperature sensor with the lock
plate and bolt.
Torque: 6.6 N*m (67 kgf*cm, 58 ft.*lbf)
(c) Connect the 7 shift solenoid valve connectors.
3. INSTALL AUTOMATIC TRANSAXLE OIL PAN SUB-
ASSEMBLY
(a) Install the 2 magnets in the oil pan.
(b) Apply seal packing to the 18 bolts.
Seal packing:
THREE BOND 2430 or equivalent
D030866
D030867
D030866
C091927E04
D030865

U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–21
AX
HINT:
*1: Drive at such a speed in the uppermost gear, to
engage lock-up. The vehicle can be driven at a
speed lower than that in the above diagram under
the lock-up condition.
NOTICE:
If necessary to drive the vehicle for
approximately 30 minutes to detect DTC P0711
(ATF temperature sensor malfunction).
G031593E28

AX–136U151F AUTOMATIC TRANSAXLE – VALVE BODY ASSEMBLY
AX
REMOVAL
1. REMOVE ENGINE UNDER COVER NO.1
2. DISCONNECT CABLE FROM NEGATIVE BATTERY
TERMINAL
3. DRAIN AUTOMATIC TRANSAXLE FLUID (See page
AX-131)
4. REMOVE AUTOMATIC TRANSAXLE OIL PAN SUB-
ASSEMBLY
(a) Remove the 18 bolts, oil pan and gasket.
NOTICE:
Some fluid will remain in the oil pan. Carefully
remove the oil pan so that the fluid remaining in
the pan does not spill out.
(b) Remove the 2 magnets from the oil pan.
(c) Examine particles in the pan.
(1) Collect any steel chips using the removed
magnets. Look carefully at the chips and
particles in the pan and on the magnets to see
the type of wear which might be found in the
transaxle.
Result:
Steel (magnetic):
Wear of the bearing, gear or plate
Brass (non-magnetic):
Wear of the bearing
5. DISCONNECT TRANSMISSION WIRE
(a) Disconnect the 7 shift solenoid valve connectors.
(b) Remove the bolt and lock plate, and disconnect the
ATF temperature sensor.
C091925
D030865
AT00103
C091927E04

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

AX–26U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
AX
(a) Waveform 1
Reference:
(b) Waveform 2
Reference:
P (E5-23) - E1 (E11-1) L-Y - BR Park position switch signalIG switch ON and shift lever P
position11 to 14 V
IG switch ON and shift lever other
then P positionBelow 1 V
N (E5-22) - E1 (E11-1) Y-R - BRNeutral position switch
signalIG switch ON and shift lever N
position11 to 14 V
IG switch ON and shift lever other
then N positionBelow 1 V
DSL (E10-11) - E1 (E11-1) Y-G - BR DSL solenoid signalVehicle speed 65 km/h (40 mph),
lock-up (ON to OFF)Pulse generation
(See waveform 2)
SR (E10-9) - E1 (E11-1) L-B - BR SR solenoid signalIG switch ON Below 1 V
3rd, 4th or 5th gear 11 to 14 V
1st or 2nd gear Below 1 V
S4 (E10-10) - E1 (E11-1) L-W - BR S4 solenoid signalIG switch ON Below 1 V
5th gear 11 to 14 V
Except 5th gear Below 1 V
SL3+ (E10-17) - SL3- (E10-16) G-B - G-R SL3 solenoid signal Engine idle speedPulse generation
(See waveform 3)
SL2+ (E10-15) - SL2- (E10-14) L-Y - L-R SL2 solenoid signal Engine idle speedPulse generation
(See waveform 4)
SL1+ (E10-19) - SL1- (E10-18) R-B - B-W SL1 solenoid signal Engine idle speedPulse generation
(See waveform 5)
NC+ (E10-34) - NC- (E10-26) R - W-G Speed sensor (NC) signalVehicle speed 30 km/h (19 mph):
(3rd gear)
Engine speed 1,400 rpmPulse generation
(See waveform 6)
NT+ (E10-35) - NT- (E10-27) W - R-W Speed sensor (NT) signal Vehicle speed 20 km/h (12mph)Pulse generation
(See waveform 7)
SLT+ (E10-13) - SLT- (E10-12) Y-R - Y-B SLT solenoid signal Engine idle speedPulse generation
(See waveform 1)
THO1 (E10-24) - E2 (E9-28) G-Y - BRATF temperature sensor
signalATF temperature: 115
C (239F)
or moreBelow 1.5 V Symbols (Terminals No.)Wiring
ColorTerminal Description Condition Specified Condition
G023426E01
Terminal SLT+ - SLT-
Tool setting 5 V/DIV, 1ms/DIV
Vehicle condition Engine idle speed
C053420E05
Terminal DSL - E1
Tool setting 10 V/DIV, 100ms/DIV
Vehicle conditionVehicle speed 65 km/h (40 mph), lock-up (ON to
OFF)

AX–182U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE UNIT
AX
5. REMOVE SPEED SENSOR
(a) Remove the 2 bolts and the 2 speed sensors from
the transaxle assembly.
6. REMOVE TRANSAXLE CASE NO.1 PLUG
(a) Remove the 4 transaxle case No.1 plugs from the
transaxle case.
(b) Remove the 4 O-rings from the 4 transaxle case
No.1 plugs.
7. FIX AUTOMATIC TRANSAXLE ASSEMBLY
(a) Fix the transaxle assembly.
8. REMOVE AUTOMATIC TRANSAXLE OIL PAN SUB-
ASSEMBLY
(a) Remove the 18 bolts, oil pan and gasket.
(b) Remove the 2 magnets from the oil pan.
D030672E01
D026716
D009176
C091925
C086316E02