2007 TOYOTA SIENNA Service Repair Manual

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Page 1737 of 3000

TOYOTA SIENNA 2007 Service Repair Manual U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–65
AX
(g) According to the display on the tester, read the "DATA
LIST".
NOTICE:
In the table below, the value listed under "

Page 1738 of 3000

TOYOTA SIENNA 2007 Service Repair Manual AX–66U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
AX
OK
REPLACE ECM

Page 1739 of 3000

TOYOTA SIENNA 2007 Service Repair Manual U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–67
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SYSTEM DESCRIPTION
The ECM uses the signals from the throttle position sensor, air-flow meter, turbine (input) speed sensor,
inter

U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–67
AX
SYSTEM DESCRIPTION
The ECM uses the signals from the throttle position sensor, air-flow meter, turbine (input) speed sensor,
intermediate (counter) shaft speed sensor and crankshaft position sensor to monitor the engagement
condition of the lock-up clutch.
Then the ECM compares the engagement condition of the lock-up clutch with the lock-up schedule in the
ECM memory to detect a mechanical problems of the shift solenoid valve DSL, valve body and torque
converter clutch.
MONITOR DESCRIPTION
Torque converter lock-up is controlled by the ECM based on the speed sensor (NT), speed sensor (NC),
engine rpm, engine load, engine temperature, vehicle speed, transmission temperature, and gear
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 turned on, it applies pressure to the
lock-up relay valve and locks the torque converter clutch.
If the ECM detects no lock-up after lock-up has been requested or if it detects lock-up when it is not
requested, the ECM interprets this as a fault in the shift solenoid valve DSL or lock-up system
performance. The ECM will turn on the MIL and store the DTC.
HINT:
Example:
When any of the following is met, the system judges it as a malfunction.
• There is a difference in rotation between the input side (engine speed) and output side (input turbine
speed) of the torque converter when the ECM commands lock-up.
(Engine speed is at least 100 rpm greater than input turbine speed.)
• There is no difference in rotation between the input side (engine speed) and output side (input turbine
speed) of the torque converter when the ECM commands lock-up off.
(The difference between engine speed and input turbine speed is less than 35 rpm.)
MONITOR STRATEGY
DTC P0741Torque Converter Clutch Solenoid Performance
(Shift Solenoid Valve DSL)
DTC No. DTC Detection Condition Trouble Area
P0741Lock-up does not occur when driving in the lock-up
range (normal driving at 80 km/h [50 mph]), or lock up
remains ON in the lock-up OFF range.
(2-trip detection logic)• Shift solenoid valve DSL remains open or closed
• Valve body is blocked
• Torque converter clutch
• Automatic transaxle (clutch, brake or gear etc.)
• Line pressure is too low
Related DTCsP0741:
Shift solenoid valve DSL/OFF malfunction
Shift solenoid valve DSL/ON malfunction
Required sensors/ComponentsShift solenoid valve DSL, Speed sensor (NT), Speed sensor (NC),
Crankshaft position sensor (NE), Throttle position sensor (VPA1),
Mass air flow sensor (MAF), Transmission temperature sensor
(THO1), Engine coolant temperature sensor (ECT)
Frequency of operation Continuous
DurationOFF malfunction (A)
Continuous.
OFF malfunction (B)
1 sec.
OFF malfunction (C)
3.5 sec.
ON malfunction
1.8 sec.

Page 1740 of 3000

TOYOTA SIENNA 2007 Service Repair Manual AX–68U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
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TYPICAL ENABLING CONDITIONS
All:
OFF malfunction (A):
OFF malfunction (B):
OFF malfunction (C):
ON malfunction:
TYPICAL MALFUNCTION

Page 1741 of 3000

TOYOTA SIENNA 2007 Service Repair Manual U151F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEMAX–69
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INSPECTION PROCEDURE
HINT:
Using the intelligent tester to perform ACTIVE TEST allows relays, VSVs, actuators and other items to be

Page 1742 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 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)

Page 1743 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 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)

Page 1744 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 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.

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