AUTOMATIC TRANSMISSION SYSTEM(for 2GR-FSE), Diagnostic DTC:P0741, P2757

DTC Code	DTC Name
P0741	Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve SL)
P2757	Torque Converter Clutch Pressure Control Solenoid Performance (Shift Solenoid Valve SLU)

DESCRIPTION

By turning the shift solenoid valve SL ON or OFF, the TCM controls the fluid pressure to the lock-up relay valve, turning the lock-up ON or OFF.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
P0741	Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve DSL)	Diagnosis Condition ECT is 40°C (104°F) or more, ATF temperature is -10°C (14°F) or more, and vehicle is driven with the shift lever in D (no malfunctions are detected in shift solenoid valve SL1, 2, 3, 4 and 5, SR, SLU, SL, transmission revolution sensors (SP2, NT), water temperature sensor, oil temperature sensor, knock control sensor, electronic throttle, or CAN2) Malfunction Status During lock-up request, the engine speed and turbine speed slip amount is 70 rpm or more Malfunction Time 2 seconds or more per trip Other 2 trip detection logic	Shift solenoid valve SL Shift solenoid valve SLU Valve body assembly Torque converter assembly Automatic transmission assembly	Comes on	DTC stored
P2757	Torque Converter Clutch Pressure Control Solenoid Performance (Shift Solenoid Valve SLU)	Diagnosis Condition ECT is 40°C (104°F) or more, ATF temperature is -10°C (14°F) or more, and the vehicle is driven with the shift lever in D (no malfunctions are detected in shift solenoid valve SL1, 2, 3, 4 and 5, SR, SLU, SL, transmission revolution sensors (SP2, NT), water temperature sensor, oil temperature sensor, knock control sensor, electronic throttle, or CAN2) Malfunction Status During lock-up request, the engine speed and turbine speed slip amount is 70 rpm or more Malfunction Time 2 seconds or more per trip Other 2 trip detection logic	Shift solenoid valve SL Shift solenoid valve SLU Valve body assembly Torque converter assembly Automatic transmission assembly	Comes on	DTC stored

MONITOR DESCRIPTION

Torque converter lock-up is controlled by the TCM based on the transmission revolution sensor (NT), engine rpm, engine load, engine temperature, vehicle speed, transmission fluid temperature, and gear selection. The TCM determines the lock-up status of the torque converter by comparing the engine rpm (NE) to the input turbine rpm (NT). The TCM calculates the actual transmission gear by comparing the input turbine rpm (NT) to the counter gear rpm (NC). When conditions are appropriate, the TCM requests "lock-up" by applying control voltage to the shift solenoid SL. When the shift solenoid 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, the TCM interprets this as a fault in the shift solenoid valve SL or SLU. The TCM will turn on the MIL and store the DTC.

Tech Tips

Example:

When the following condition is met, the system judges it to be 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.

(Engine speed is at least 70 rpm greater than the input turbine speed.)

CAUTION / NOTICE / HINT

Note

Perform registration and/or initialization when parts related to the automatic transmission are replaced.

Click here

PROCEDURE

READ VALUE USING GTS

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / ECT / Trouble Codes.

Powertrain > ECT > Trouble Codes

Read the DTCs using the GTS.

Result

Result	Proceed to
Only DTCs P0741 and P2757 are output	A
P0741, P2757 and other DTCs are output	B

Tech Tips

If a solenoid related or oil pressure switch related DTC is output, troubleshoot that DTC first.

GO TO DTC CHART Click here

INSPECT SHIFT SOLENOID VALVE SL

Remove the shift solenoid valve SL.

Click here

*a	Shift Solenoid Valve SL

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
Shift solenoid SL connector - Shift solenoid SL body	20°C (68°F)	11 to 15 Ω

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.

Result

Proceed to
OK
NG

REPLACE SHIFT SOLENOID VALVE SL Click here

INSPECT SHIFT SOLENOID VALVE SLU

*a
Component without harness connected

(Shift Solenoid Valve SLU)

Remove the shift solenoid valve SLU.

Click here

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
Terminal 1 of the shift solenoid valve SLU - Terminal 2	20°C (68°F)	5.0 to 5.6 Ω

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.

Result

Proceed to
OK
NG

REPLACE SHIFT SOLENOID VALVE SLU Click here

INSPECT TRANSMISSION VALVE BODY ASSEMBLY

Check the transmission valve body assembly.

OK
There is no foreign matter on each valve and they operate smoothly.

Result

Proceed to
OK
NG

REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY Click here

INSPECT TORQUE CONVERTER ASSEMBLY

Check the torque converter assembly.

Click here

OK
The torque converter operates normally.

Result

Proceed to
OK
NG

REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY Click here

REPLACE TORQUE CONVERTER ASSEMBLY Click here