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

Transmission. Camry. Acv40 Gsv40
U250E Automatic Transaxle. Camry. Acv40 Gsv40

SYSTEM DESCRIPTION

MONITOR DESCRIPTION

INSPECTION PROCEDURE

CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0741)

INSPECT TRANSMISSION WIRE (DSL)

CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)

INSPECT SHIFT SOLENOID VALVE (DSL)

CHECK TRANSMISSION WIRE

INSPECT TRANSMISSION VALVE BODY ASSEMBLY

INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY

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 condition 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 converter clutch.

DTC No.
DTC Detection CondS1ition
Trouble Area
P0741
Lock-up does not occur when driving in the lock-up range (normal driving at 80 km/h [50 mph]), or lock up remains ON in the lock-up OFF range.
(2-trip detection logic)
  1. Shift solenoid valve DSL remains open or closed
  2. Valve body is 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 ECM based on the 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 the shift solenoid DSL. When the DSL is turned on, it 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 requested, 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.
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 ECM commands lock-up.
    (Engine speed is at least 75 rpm greater than 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 ECM commands lock-up off.
    (The difference between engine speed and input turbine speed is less than 35 rpm.)

INSPECTION PROCEDURE


ACTIVE TEST
HINT:
Performing the intelligent tester Active Test allows relay, Vacuum Switching Valve (VSV), actuator and other items to be operated without removing any parts. Performing the Active Test early in troubleshooting is one way to shorten labor time.
The Data List can be displayed during the Active Test.

  1. Warm up the engine.

  2. Turn the ignition switch off.

  3. Connect the intelligent tester together to the DLC3.

  4. Turn the ignition switch to the ON position.

  5. Turn on the tester.

  6. Select the item "Enter / Powertrain / ECT / Active Test".

  7. Follow the instructions on the tester and read the Active Test.

    Item
    		Test Details
    		Diagnostic Note
    Control the Lock Up
    		[Test Details]
    Control the shift solenoid DSL to set the automatic transmission to the lock-up condition.
    [Vehicle Condition]
    1. Vehicle Speed: 60 km/h (37 mph) or more
    		Possible to check the DSL 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 with the 5th gear.


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


    Camry. Acv40 Gsv40.U250E Automatic Transaxle.Automatic Transaxle System. Dtc P0741 Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve Dsl)

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

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to the ON position.

  1. Turn on the tester.

  1. Select the item "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 troubleshooting for those DTCs first.


B
GO TO DTC CHART
A


2.INSPECT TRANSMISSION WIRE (DSL)


    Camry. Acv40 Gsv40.U250E Automatic Transaxle.Automatic Transaxle System. Dtc P0741 Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve Dsl)

  1. Disconnect the transmission wire connector 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)
    10 - Body ground
    		11 to 13 Ω


NG
Go to step 4
OK


3.CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)


    Camry. Acv40 Gsv40.U250E Automatic Transaxle.Automatic Transaxle System. Dtc P0741 Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve Dsl)

  1. Connect the transmission wire connector.

  1. Disconnect the ECM connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    20°C (68°F)
    C24-79 (DSL) - Body ground
    		11 to 13 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.INSPECT SHIFT SOLENOID VALVE (DSL)


    Camry. Acv40 Gsv40.U250E Automatic Transaxle.Automatic Transaxle System. Dtc P0741 Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve Dsl)

  1. Remove the shift solenoid valve DSL.

  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 (DSL) - Solenoid Body (DSL)
    		11 to 13 Ω

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

    OK:
    The solenoid valve makes an operating sound.


NG
REPLACE SHIFT SOLENOID VALVE (DSL)
OK


5.CHECK TRANSMISSION WIRE
OK:
The connectors and pins are securely installed.
There is no open or short on the wire harness.


NG
REPAIR OR REPLACE TRANSMISSION WIRE
OK


6.INSPECT TRANSMISSION VALVE BODY ASSEMBLY
OK:
There are no foreign objects on each valve.


NG
REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY
OK


7.INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY
OK:
The torque converter clutch operates normally.


NG
REPLACE TORQUE CONVERTER CLUTCH ASSEMBLY
OK

REPAIR AUTOMATIC TRANSAXLE ASSEMBLY