Last Modified: 04-05-2023 |
6.11:8.1.0 |
Doc ID: RM100000000VIMS |
Model Year Start: 2016 |
Model: Sienna |
Prod Date Range: [12/2015 - 08/2016] |
Title: U660F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: P2757; Torque Converter Clutch Pressure Control Solenoid Performance (Shift Solenoid Valve SLU); 2016 MY Sienna [12/2015 - 08/2016] |
DTC
|
P2757
|
Torque Converter Clutch Pressure Control Solenoid Performance (Shift Solenoid Valve SLU)
|
DESCRIPTION
The TCM uses the signals from the throttle position sensor, air-flow meter, input speed sensor (NT), output speed sensor (NC) and crankshaft position sensor (NE) to monitor the engagement condition of the lock-up clutch.
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 SLU, valve body and torque converter clutch mechanical problems.
DTC No.
|
DTC Detection Condition
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Trouble Area
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P2757
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When both of the following are detected (2 trip detection logic):
-
Lock-up does not occur when requested.
-
No. 3 ATF pressure switch is OFF.
When both of the following are detected (2 trip detection logic):
-
No. 3 ATF pressure switch is ON when lock-up does not occur.
-
Lock-up occurs when shift solenoid valve SLU is requested to turn on in the lock-up range.
|
-
Shift solenoid valve SLU remains open or closed
-
Valve body is blocked
-
Torque converter assembly
-
Automatic transaxle (clutch, brake or gear, etc.)
-
Line pressure is too low
|
MONITOR DESCRIPTION
Torque converter lock-up is controlled by the TCM based on the speed sensor (NT), speed sensor (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 input speed (NT) to output speed (NC). When conditions are appropriate, the TCM requests "lock-up" by applying control voltage to shift solenoid SLU. When SLU 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 SLU or lock-up system performance.
The TCM will turn on the MIL and store the DTC.
Example:
When any of the following is met, the system judges it as a malfunction.
MONITOR STRATEGY
Related DTCs
|
P2757:
Shift solenoid valve SLU OFF malfunction
Shift solenoid valve SLU ON malfunction
|
Required sensors/Components
|
Shift solenoid valve SLU
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Frequency of operation
|
Continuous
|
Duration
|
OFF malfunction (a): 3.5 seconds
OFF malfunction (b): 0.05 seconds
ON malfunction (a): 1.8 seconds
ON malfunction (b): 0.6 seconds
|
MIL operation
|
2 driving cycles
|
Sequence of operation
|
None
|
TYPICAL ENABLING CONDITIONS
The following items are common to all conditions below.
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
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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
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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
|
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
|
OFF malfunction:
TCM lock-up command
|
ON
(SLU pressure: 513 kPa (5.2 kgf/ cm2, 74 psi) or more
|
Duration time from lock-up on command
|
3 seconds or more
|
Shift solenoid valve SLU
|
Not ON malfunction
|
ON malfunction:
TCM lock-up command
|
OFF
(SLU pressure: less than 4 kPa (0.04 kgf/ cm2, 0.6 psi)
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Duration time from lock-up on command
|
0.064 seconds or more
|
Throttle valve opening angle
|
7% or more
|
Vehicle speed
|
Less than 60 km/h (37.3 mph)
|
Shift solenoid valve SLU
|
Not malfunction
(P2757)
|
Shift solenoid valve SL
|
Not OFF malfunction
(P0741)
|
No. 3 ATF pressure switch
|
Not ON malfunction
(P0990)
|
TYPICAL MALFUNCTION THRESHOLDS
OFF malfunction:
Following conditions are met
|
(a) and (b)
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(a) l Engine speed (NE) - Input speed (NT) l
|
70 rpm or more
|
(b) No. 3 ATF pressure switch
|
OFF
|
ON malfunction:
Following conditions are met
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(a) and (b)
|
(a) l Engine speed (NE) - Input speed (NT) l
|
Less than 35 rpm
|
(b) No. 3 ATF pressure switch
|
ON
|
COMPONENT OPERATING RANGE
Input speed sensor (NT)
|
Input speed is equal to engine speed when lock-up is 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. 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
|
Control 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 P2757)
|
(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 P2757 is output
|
A
|
P2757 and other DTCs are output
|
B
|
HINT:
If any other codes besides P2757 are output, perform troubleshooting for those DTCs first.
A
|
|
|
2.
|
INSPECT SHIFT SOLENOID VALVE SLU
|
(a) Remove shift solenoid valve SLU.
|
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
1 - 2
|
20°C (68°F)
|
5.0 to 5.6 Ω
|
Text in Illustration
*a
|
Component without harness connected
(Shift Solenoid Valve SLU)
|
(c) Connect a battery positive (+) lead with a 21 W bulb to terminal 2 and a negative (-) lead to terminal 1 of the solenoid valve connector. Then check that the valve moves and makes an operating sound.
OK:
Valve moves and makes an operating sound.
OK
|
|
|
3.
|
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
|
|
|
4.
|
INSPECT TORQUE CONVERTER ASSEMBLY
|
(a) Check the torque converter assembly (See page
).
OK:
The torque converter assembly operates normally.
|