Last Modified: 04-05-2023 |
6.11:8.1.0 |
Doc ID: RM100000000VIL3 |
Model Year Start: 2016 |
Model: Sienna |
Prod Date Range: [12/2015 - 08/2016] |
Title: U660E (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: P0741; Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve SL); 2016 MY Sienna [12/2015 - 08/2016] |
DTC
|
P0741
|
Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve SL)
|
DESCRIPTION
The TCM uses signals from the throttle position sensor, air-flow meter, input speed sensor, output speed sensor and crankshaft position sensor to help determine the engagement timing of the lock-up clutch. The TCM monitors the engagement of the clutch using the input speed sensor, output speed sensor and crankshaft position sensor.
Then the TCM compares the engagement condition of the lock-up clutch with the lock-up schedule in the TCM memory to detect shift solenoid valve SL, valve body and torque converter assembly mechanical problems.
DTC No.
|
DTC Detection Condition
|
Trouble Area
|
P0741
|
When both of the following are detected (2 trip detection logic):
-
Lock-up does not occur when requested.
-
Transmission fluid pressure switch No. 3 is ON.
|
-
Shift solenoid valve SL remains closed
-
Valve body is blocked
-
Torque converter assembly
-
Automatic transaxle (clutch, brake or gear etc.)
-
Transmission wire
-
Line pressure is too low
|
MONITOR DESCRIPTION
Torque converter lock-up is controlled by the TCM based on the input speed (NT), output speed (NC), engine speed (NE), engine load, engine temperature, vehicle speed, automatic transmission fluid (ATF) temperature, and gear selection. The TCM determines the lock-up status of the torque converter by comparing the engine speed (NE) to the input speed (NT). The TCM calculates the actual transmission gear by comparing the input speed (NT) to the output speed (NC). When conditions are appropriate, the TCM requests "lock-up" by applying control voltage to shift solenoid SL. When SL is turned on, it applies pressure to the lock-up relay valve and locks the torque converter assembly.
If the TCM detects no lock-up after lock-up has been requested or if it detects lock-up when it is not requested, the TCM interprets this as a fault in shift solenoid valve SL or lock-up system performance. The TCM will turn on the MIL and store the DTC.
HINT:
Example:
When the following is met, the system judges it as a malfunction.
There is a difference in rotation (speed) between the input side (engine speed) and output side (input turbine speed) of the torque converter when the TCM commands lock-up.
MONITOR STRATEGY
Related DTCs
|
P0741:
Shift solenoid valve SL OFF malfunction
|
Required sensors/Components
|
Shift solenoid valve SL, Input speed sensor (NT), Output 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
|
Duration
|
OFF malfunction (a): 3.5 seconds
OFF malfunction (b): 0.05 seconds
|
MIL operation
|
2 driving cycles
|
Sequence of operation
|
None
|
TYPICAL ENABLING CONDITIONS
ALL:
The monitor will run whenever this DTC is not present.
(Not circuit malfunction)
|
P0712, P0713 (ATF temperature sensor circuit (TFT sensor))
P0115, P0117, P0118 (ECT sensor circuit)
P0715, P0717 (Input speed sensor (NT) circuit)
P0791, P0793 (Output speed sensor (NC) circuit)
P0748 (Shift solenoid valve SL1 circuit)
P0778 (Shift solenoid valve SL2 circuit)
P0798 (Shift solenoid valve SL3 circuit)
P2810 (Shift solenoid valve SL4 circuit)
P2759 (Shift solenoid valve SLU circuit)
P2769, P2770 (Shift solenoid valve SL circuit)
P0327, P0328, P0332, P0333 (KCS sensor circuit)
P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0604, P0606, P060A, P060B, P060D, P060E, P0657, P1607, P2102, P2103, P2111, P2112, P2118, P2119, P2135 ((ETCS) Electronic throttle control system)
U0100 (CAN communication system)
|
Engine coolant temperature
|
40°C (104°F) or more
|
Spark advance from Max. retard timing by KCS control
|
0°CA or more
|
Transmission range
|
D
|
TFT (Transmission fluid temperature)
|
-10°C (14°F) or more
|
TFT (Transmission fluid temperature) sensor circuit
|
No circuit malfunction
|
ECT (Engine coolant temperature) sensor circuit
|
No circuit malfunction
|
Input speed sensor (NT) circuit
|
No circuit malfunction
|
Output speed sensor (NC) circuit
|
No circuit malfunction
|
Shift solenoid valve SL1 circuit
|
No circuit malfunction
|
Shift solenoid valve SL2 circuit
|
No circuit malfunction
|
Shift solenoid valve SL3 circuit
|
No circuit malfunction
|
Shift solenoid valve SL4 circuit
|
No circuit malfunction
|
Shift solenoid valve SLU circuit
|
No circuit malfunction
|
Shift solenoid valve SL circuit
|
No circuit malfunction
|
KCS (Knock control sensor circuit)
|
No circuit malfunction
|
(ETCS) Electronic throttle control system
|
Not system down
|
CAN communication system
|
Not system down
|
Engine
|
Starting
|
TCM selected gear
|
Not 1st
|
Vehicle speed
|
25 km/h (15.5 mph) or more
|
Input speed (NT) / Output speed (NO) with 1st
|
3.304 to 7.724
|
Input speed (NT) / Output speed (NO) with 2nd
|
1.901 to 2.340
|
Input speed (NT) / Output speed (NO) with 3rd
|
1.399 to 1.649
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Input speed (NT) / Output speed (NO) with 4th
|
0.998 to 1.138
|
Input speed (NT) / Output speed (NO) with 5th
|
0.705 to 0.836
|
Input speed (NT) / Output speed (NO) with 6th
|
0.568 to 0.695
|
TYPICAL MALFUNCTION THRESHOLDS
OFF malfunction:
Following conditions are met
|
(a) and (b)
|
(a) l Engine Speed (NE) - Input speed (NT) l
|
70 rpm or more
|
(b) Transmission fluid pressure switch
|
ON
|
CAUTION / NOTICE / HINT
NOTICE:
Perform the universal trip to clear permanent DTCs (See page
).
HINT:
Using the Techstream to perform Active Tests 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 Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.
1. PERFORM ACTIVE TEST
(a) Warm up the engine.
(b) Turn the ignition switch off.
(c) Connect the Techstream to the DLC3.
(d) Turn the ignition switch to ON.
(e) Turn the Techstream on.
(f) Enter the following menus: Powertrain / ECT / Active Test.
(g) According to the display on the Techstream, perform the Active Test.
ECT
Tester Display
|
Test Part
|
Control Range
|
Diagnostic Note
|
Activate the Lock Up
|
Controls the shift solenoid SLU and SL to set the automatic transaxle to the lock-up condition.
|
ON/OFF
|
Can be used to check SLU and SL solenoid operation.
[Vehicle Condition]
-
Vehicle speed: 60 km/h (37 mph) or more
|
HINT:
-
This test can be conducted when the vehicle speed is 60 km/h (37 mph) or more.
(h) Lightly depress the accelerator pedal and check that the engine speed does not change abruptly.
HINT:
-
When changing the accelerator pedal opening angle while driving, if the engine speed does not change, lock-up is on.
-
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.)
PROCEDURE
1.
|
CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0741)
|
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / ECT / Trouble Codes.
(e) Read the DTCs using the Techstream.
Result
Result
|
Proceed to
|
Only P0741 is output
|
A
|
P0741 and other DTCs output
|
B
|
HINT:
If any other codes besides P0741 are output, perform the troubleshooting for those DTCs first.
A
|
|
|
2.
|
INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL)
|
(a) Remove the TCM from the transaxle.
|
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
6 (SL) - Body ground
|
20°C (68°F)
|
11 to 15 Ω
|
Text in Illustration
*a
|
Component without harness connected:
(Transmission Wire)
|
OK
|
|
|
3.
|
INSPECT SHIFT SOLENOID VALVE SL (OPERATION)
|
(a) Remove shift solenoid valve SL.
|
|
(b) Connect a battery positive (+) lead to the terminal of the solenoid valve connector, and a negative (-) lead to the solenoid body. Then check that the valve moves and makes an operating sound.
OK:
Valve moves and makes an operating sound.
Text in Illustration
*a
|
Component without harness connected:
(Shift Solenoid Valve SL)
|
OK
|
|
|
4.
|
INSPECT TRANSMISSION VALVE BODY ASSEMBLY
|
(a) Check the transmission valve body assembly (See page
).
OK:
There are no foreign objects on each valve and they operate smoothly.
OK
|
|
|
5.
|
INSPECT TORQUE CONVERTER ASSEMBLY
|
(a) Check the torque converter assembly (See page
).
OK:
The torque converter assembly operates normally.
6.
|
INSPECT SHIFT SOLENOID VALVE SL (RESISTANCE)
|
(a) Remove shift solenoid valve SL.
|
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
1 - Solenoid Body
|
20°C (68°F)
|
11 to 15 Ω
|
Text in Illustration
*a
|
Component without harness connected:
(Shift Solenoid Valve SL)
|
|