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DIAGNOSTICS - ELECTRONIC CONTROLLED AUTOMATIC 05-585
TRANSAXLE [ECT] 05NPE-01
DTC P0741 TORQUE CONVERTER CLUTCH SOLENOID
PERFORMANCE (SHIFT SOLENOID VALVE
DSL)
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 condi-
tion 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 con-
verter clutch.
DTC No. DTC Detection Condition Trouble Area
S Shift solenoid valve DSL remains open or closed
S Valve body is blocked
S Shift solenoid valve DSL
Lock-up does not occur when driving in lock-up range or lock-
P0741 S Torque converter clutch
up remains ON in lock-up OFF range (2-trip detection logic)
S Automatic transaxle (clutch, brake or gear etc.)
S Line pressure is too low
S ECM
MONITOR DESCRIPTION
Torque converter lock-up is controlled by the ECM based on 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 shift solenoid DSL. When the DSL is turned on, solenoid DSL 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 re-
quested, 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.
Example:
When any of the following is met, the system judges it as a malfunction.
(a) There is a difference in rotation between before and after torque converters even when the ECM com-
mands lock-up.
(Engine speed is at least 75 rpm greater than input turbine speed.)
(b) There is no difference in rotation between before and after torque converters even when the ECM com-
mands lock-up off.
(The difference between engine speed and input turbine speed is less than 35 rpm.)
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 768
05-586 DIAGNOSTICS - ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]
MONITOR STRATEGY
P0741: Shift solenoid valve DSL/OFF malfunction
Related DTCs
P0741: Shift solenoid valve DSL/ON malfunction
Shift solenoid valve DSL, Speed sensor (NT), Speed sensor (NC),Crankshaft posi-
tion sensor (NE), Throttle position sensor (VPA1), Mass air flow sensor (MAF),
Required sensors/Components
Transmission temperature sensor (THO1), Engine coolant temperature sensor
(ECT)
Frequency of operation Continuous
OFF malfunction
3.2 sec.
Duration
ON malfunction
1.8 sec.
MIL operation 2 driving cycles
Sequence of operation None
TYPICAL ENABLING CONDITIONS
ALL:
Transmission range "D"
ECT (Engine coolant temperature) 10_C (50_F) or more
TFT (Transmission fluid temperature) -20 _C (-4_F) or more
TFT sensor circuit Not circuit malfunction
ECT sensor circuit Not 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
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
OFF malfunction
ECM lock-up command ON
Duration time from lock-up on command 3 sec. or more
ECM selected gear 3rd, 4th or 5th
Vehicle speed 25 km/h (15.5 mph) or more
ON malfunction
ECM lock-up command OFF
ECM selected gear 3rd, 4th or 5th
Throttle valve opening angle 10% or more
Vehicle speed 25 to 60 km/h (15.5 to 37.3 mph)
TYPICAL MALFUNCTION THRESHOLDS
Either of the following conditions is met: OFF malfunction or ON malfunction
OFF malfunction
Engine speed - Input (turbine) speed 100 rpm or more
ON malfunction
Diffierence between engine speed and input (turbine) speed Less than 35 rpm
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 769
DIAGNOSTICS - ELECTRONIC CONTROLLED AUTOMATIC 05-587
TRANSAXLE [ECT]
INSPECTION PROCEDURE
HINT:
Performing the ACTIVE TEST using the hand-held tester allows the relay, VSV, actuator and so on to oper-
ate without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one method
to shorten labor time.
It is possible to display the DATA LIST during the ACTIVE TEST.
(a) Warm up the engine.
(b) Turn the ignition switch off.
(c) Connect the hand-held tester to the DLC3.
(d) Turn the ignition switch to the ON position.
(e) Push the "ON" button of the hand-held tester.
(f) When you use hand-held tester:
Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST".
(g) According to the display on tester, perform the "ACTIVE TEST".
Item Test Details Diagnostic Note
[Test Details]
Control the shift solenoid DSL to set the automatic transaxle to the
Possible to check the DSL opera-
LOCK UP lock-up condition.
tion.
[Vehicle Condition]
Vehicle Speed: 60 km/h (37 mph) or more
HINT:
S This test can be conducted when the vehicle speed is 60 km/h (37 mph) or more.
S This test can be conducted with the 5th gear.
(h) Lightly depress the accelerator pedal and check that the engine speed does not change abruptly.
HINT:
S When changing the accelerator pedal opening angle while driving, if the engine speed does not
change, lock-up is on.
S 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.)
Accelerator Pedal
Opening Angle
Accelerator Pedal Lock-up OFF
Fully Released
Engine Speed
Lock-up ON
time
G23400 G29214
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 770
05-588 DIAGNOSTICS - ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]
1 INSPECT TRANSMISSION WIRE(DSL)
(a) Disconnect the transmission wire connector from the
transaxle.
(b) Measure resistance between the terminal DSL and body
ground.
OK:
Resistance: 11 to 13 at 20 _C (68 _F)
DSL
G24201 G25185
NG Go to step 3
OK
2 CHECK HARNESS AND CONNECTOR(TRANSMISSION WIRE - ECM)
(a) Connect the transmission wire connector.
E8 E7 E6 E5 E4 (b) Disconnect the ECM connector.
(c) Measure the resistance between terminals DSL and E1.
OK:
Resistance: 11 to 13 at 20 _C (68 _F)
E1
DSL NG REPAIR OR REPLACE HARNESS OR
C82158 C91565 CONNECTOR(See page 01-37 )
OK
3 INSPECT SHIFT SOLENOID VALVE DSL
(a) Remove the shift solenoid valve DSL.
(b) Measure the resistance between the terminal DSL of shift
solenoid valve and the solenoid body.
OK:
Resistance: 11 to 13 at 20 _C (68 _F)
(c) Connect positive (+) lead to the terminal of solenoid con-
nector, negative (-) lead to the solenoid body.
OK:
The solenoid valve makes an operating noise.
(-) (+)
C90646
NG REPLACE SHIFT SOLENOID VALVE DSL
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 771
DIAGNOSTICS - ELECTRONIC CONTROLLED AUTOMATIC 05-589
TRANSAXLE [ECT]
4 CHECK TRANSMISSION WIRE(See page 01-37 )
NG REPAIR OR REPLACE TRANSMISSION WIRE
(See page 40-22 )
OK
5 INSPECT TRANSMISSION VALVE BODY ASSY(See chapter 2 in the problem
symptoms table)(See page 05-561 )
NG REPAIR OR REPLACE TRANSMISSION VALVE
BODY ASSY(See page 40-25 )
OK
6 INSPECT TORQUE CONVERTER CLUTCH ASSY(See page 40-18 )
NG REPLACE TORQUE CONVERTER CLUTCH
ASSY
OK
REPAIR AUTOMATIC TRANSAXLE ASSY(See page 40-8 )
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 772
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