Dtc P0741 Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve Sl)

Transmission. Camry. Acv40 Gsv40
U660E Automatic Transaxle. Camry. Acv40 Gsv40

SYSTEM DESCRIPTION

MONITOR DESCRIPTION

INSPECTION PROCEDURE

CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0741)

CHECK TRANSMISSION WIRE

CHECK SHIFT SOLENOID VALVE SL (RESISTANCE)

CHECK SHIFT SOLENOID VALVE SL (OPERATION)

CHECK TRANSMISSION VALVE BODY ASSEMBLY

CHECK TORQUE CONVERTER CLUTCH ASSEMBLY

DTC P0741 Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve SL)


SYSTEM DESCRIPTION

The TCM uses signals from the throttle position sensor, air-flow meter, turbine (input) speed sensor, intermediate (counter) 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 turbine (input) speed sensor, intermediate (counter) 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 clutch mechanical problems.

DTC No.
DTC Detection Condition
Trouble Area
P0741
When both of the following are detected (2-trip detection logic):
  1. Lock-up does not occurs when requested.
  2. Transmission fluid pressure switch No. 3 is ON.
  1. Shift solenoid valve SL (closed)
  2. Valve body (blocked)
  3. Torque converter clutch
  4. Automatic transaxle (clutch, brake or gear etc.)
  5. 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 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 SL is turned on, it applies pressure to the lock-up relay valve and locks the torque converter clutch.
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 the shift solenoid valve SL or lock-up system performance. The TCM 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.
  1. There is a difference in rotation 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.)
  2. There is no difference in rotation between the input side (engine speed) and output side (input turbine speed) of the torque converter when the TCM commands lock-up off.
    (The difference between the engine speed and input turbine speed is less than 20 rpm.)

INSPECTION PROCEDURE

HINT:
Performing the Active Test using the intelligent tester allows relays, VSVs, actuators and so on to operate without removing any parts. Performing the Active Test as the first step in troubleshooting is one method to save labor time.
It is possible to display the Data List during the Active Test.

PERFORM ACTIVE TEST

  1. Warm up the engine.

  2. Turn the ignition switch off.

  3. Connect the intelligent tester to the DLC3.

  4. Turn the ignition switch on.

  5. Turn the intelligent tester on.

  6. When using the intelligent tester:
    Enter the following items: "Powertrain / ECT / Active Test".

  7. According to the display on the tester, perform "Active Test".

    Item
    		Test Details
    		Diagnostic Note
    Active the Lock Up
    		[Test Details]
    Control the shift solenoid SL to set the automatic transaxle to the lock-up condition.
    [Vehicle Condition]
    Vehicle Speed: 60 km/h (37 mph) or more.
    		Possible to check the SL operation.
    HINT:
    1. This test can be conducted when the vehicle speed is 60 km/h (37 mph) or more.
    2. This test can be conducted in the 6th gear.


  8. Lightly depress the accelerator pedal and check that the engine speed does not change abruptly.

    HINT:
    1. When changing the accelerator pedal opening angle while driving, if the engine speed does not change, lock-up is on.
    2. 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.)

    Camry. Acv40 Gsv40.U660E Automatic Transaxle.Automatic Transaxle System. Dtc P0741 Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve Sl)

1.CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0741)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on and turn the intelligent tester on.

  1. Enter the following items: "Powertrain / ECT / DTC / Current or Pending".

  1. Read the DTCs using the intelligent tester.

    Result:

    Display (DTC output)
    		Proceed to
    Only "P0741" is output
    		A
    "P0741" and other DTCs
    		B
    HINT:
    If any other codes besides "P0741" are output, perform the troubleshooting for those DTCs first.


B
GO TO DTC CHART
A


2.CHECK TRANSMISSION WIRE


    Camry. Acv40 Gsv40.U660E Automatic Transaxle.Automatic Transaxle System. Dtc P0741 Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve Sl)

  1. Remove the TCM from the transaxle.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    20°C (68°F)
    6 (SL) - Body ground
    		11 to 15 Ω


OK
Go to step 4
NG


3.CHECK SHIFT SOLENOID VALVE SL (RESISTANCE)


    Camry. Acv40 Gsv40

  1. Remove the shift solenoid valve SL.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    20°C (68°F)
    Solenoid Connector (SL) - Solenoid Body (SL)
    		11 to 15 Ω


NG
REPLACE SHIFT SOLENOID VALVE SL
OK

REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY

4.CHECK SHIFT SOLENOID VALVE SL (OPERATION)


    Camry. Acv40 Gsv40

  1. Remove the shift solenoid valve SL.

  1. Connect a positive (+) lead to the terminal of the solenoid connector, and a negative (-) lead to the solenoid body.

    OK:
    The solenoid valve makes an operating noise.


NG
REPLACE SHIFT SOLENOID VALVE SL
OK


5.CHECK TRANSMISSION VALVE BODY ASSEMBLY
OK:
There are no foreign objects on each valve and they operate smoothly.


NG
REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY
OK


6.CHECK TORQUE CONVERTER CLUTCH ASSEMBLY
OK:
The torque converter clutch operates normally.


NG
REPLACE TORQUE CONVERTER CLUTCH ASSEMBLY
OK

REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY