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

Transmission. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
U241E Automatic Transaxle. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0741)

INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE 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)


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 mechanical problems with shift solenoid valve DSL, the valve body and torque converter clutch.

DTC Code
DTC Detection Condition
Trouble Area
P0741
Lock-up does not occur when driving in the lock-up range, 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. Shift solenoid valve DSL
  4. Torque converter clutch
  5. Automatic transaxle (clutch, brake, gear, etc.)
  6. Line pressure is too low

MONITOR DESCRIPTION

Torque converter clutch lock-up is controlled by the ECM based on the speed sensor (NT) signal, speed sensor (NC) signal, engine speed, engine load, engine temperature, vehicle speed, transaxle temperature and gear selection.
The ECM determines the lock-up status of the torque converter clutch by comparing the engine speed (NE) to the input turbine speed (NT). The ECM calculates the actual transaxle gear by comparing the input turbine speed (NT) to the counter gear speed (NC). When conditions are appropriate, the ECM requests lock-up by applying control voltage to shift solenoid valve DSL. When shift solenoid valve 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 lock-up is not requested, the ECM interprets this as a fault in shift solenoid valve DSL or lock-up system performance.
Then the ECM illuminates the MIL and stores the DTC.
Example:
When either of the following is met, the system determines that there is a malfunction.
  1. There is a difference in speed between the input side (engine speed) and output side (input turbine speed) of the torque converter clutch when the ECM commands lock-up ON.
    (The engine speed is at least 100 rpm more than the input turbine speed.)
  2. There is no difference in speed between the input side (engine speed) and output side (input turbine speed) of the torque converter clutch when the ECM commands lock-up OFF.
    (The difference between the engine speed and input turbine speed is less than 35 rpm.)

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.U241E Automatic Transaxle.Automatic Transaxle System. Dtc P0741 Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve Dsl)


INSPECTION PROCEDURE


ACTIVE TEST
HINT:
Using the intelligent tester 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. Warm up the engine.

  2. Turn the ignition switch off.

  3. Connect the intelligent tester to the DLC3.

  4. Turn the ignition switch on (IG).

  5. Turn the intelligent tester on.

  6. Enter the following menus: Powertrain / Engine and ECT / Active Test.

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

    Engine and ECT
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Activate the Lock Up
    		Control shift solenoid valve DSL to set automatic transaxle to lock-up
    		ON or OFF
    		It is possible to check shift solenoid valve DSL operation.
    [Vehicle Condition]
    1. The throttle valve opening amount is less than 35%.
    2. The vehicle speed is 60 km/h (37 mph) or more.
    HINT:
    1. This test can be conducted when the vehicle speed is 60 km/h (37 mph) or more.
    2. Perform this test while driving in 3rd or 4th gear.


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


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.U241E Automatic Transaxle.Automatic Transaxle System. Dtc P0741 Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve Dsl)

    HINT:
    1. When depressing the accelerator pedal while driving, if the engine speed does not change abruptly, lock-up is on.
    2. Slowly release the accelerator pedal in order to decelerate, but do not fully release the pedal (fully releasing the pedal will close the throttle valve and lock-up may be turned off automatically).
1.CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0741)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG).

  1. Turn the intelligent tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. Read the DTCs using the tester.

    Result
    Result
    		Proceed to
    Only P0741 is output
    		A
    P0741 and other DTCs are output
    		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 (SHIFT SOLENOID VALVE DSL)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.U241E Automatic Transaxle.Automatic Transaxle System. Dtc P0741 Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve Dsl)

  1. Disconnect the B29 transmission wire connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3 (DSL) - Body ground
    		20°C (68°F)
    		11 to 13 Ω
    Text in Illustration
    *a
    		Component without harness connected
    (Transmission Wire)


NG
Go to step 4
OK


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


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.U241E Automatic Transaxle.Automatic Transaxle System. Dtc P0741 Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve Dsl)

  1. Disconnect the B32 ECM connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    B32-79 (DSL) - Body ground
    		20°C (68°F)
    		11 to 13 Ω
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to ECM)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM

4.INSPECT SHIFT SOLENOID VALVE DSL


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.U241E Automatic Transaxle.Automatic Transaxle System. Dtc P0741 Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve Dsl)

  1. Remove shift solenoid valve DSL.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    Shift solenoid valve DSL connector terminal - Shift solenoid valve DSL body
    		20°C (68°F)
    		11 to 13 Ω

  1. Apply 12 V battery voltage to the shift solenoid valve and check that the valve moves and makes an operating noise.

    OK:
    Measurement Condition
    		Specified Condition
    1. Battery positive (+) → Shift solenoid valve DSL connector
    2. Battery negative (-) → Shift solenoid valve DSL body
    		Valve moves and makes an operating noise
Text in Illustration
*a
Component without harness connected
(Shift Solenoid Valve DSL)


NG
REPLACE SHIFT SOLENOID VALVE DSL
OK


5.CHECK TRANSMISSION WIRE

  1. Check the transmission wire.

    OK:
    The connectors and pins are securely installed.
    There is no open or short in the wire harness.


NG
REPAIR OR REPLACE TRANSMISSION WIRE
OK


6.INSPECT TRANSMISSION VALVE BODY ASSEMBLY

  1. Check the transmission valve body assembly.

    OK:
    There are no foreign objects on any valve.


NG
REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY
OK


7.INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY

  1. Check the torque converter clutch assembly.

    OK:
    The torque converter clutch operates normally.


NG
REPLACE TORQUE CONVERTER CLUTCH ASSEMBLY
OK

REPAIR AUTOMATIC TRANSAXLE ASSEMBLY