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

Drivetrain. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
A343E Automatic Transmission Transaxle. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

MONITOR DESCRIPTION

INSPECTION PROCEDURE

CHECK DTC OUTPUT (IN ADDITION TO DTC P0741)

INSPECT SHIFT SOLENOID VALVE SL

INSPECT TRANSMISSION VALVE BODY ASSEMBLY

INSPECT TORQUE CONVERTER ASSEMBLY

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


DESCRIPTION

The ECM uses the signals from the throttle position sensor, Mass Air Flow (MAF) meter, speed sensor (NC0), speed sensor (SP2) 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 of the shift solenoid valve SL, valve body and torque converter.

DTC Code
DTC Detection Condition
Trouble Area
P0741
Lock-up does not occur when driving in lock-up range (normal driving at 80 km/h (50 mph)), or lock-up remains ON in lock-up OFF range (2-trip detection logic)
  1. Shift solenoid valve SL remains open or closed
  2. Valve body is blocked
  3. Shift solenoid valve SL
  4. Torque converter
  5. Automatic transmission (clutch, brake or gear etc.)
  6. ECM

MONITOR DESCRIPTION

Based on the signals from the throttle position sensor, MAF meter and crankshaft position sensor, the ECM sends a signal to the shift solenoid valve SL to regulate the hydraulic pressure and provide smoother gearshifts. The shift solenoid valve SL responds to commands from the ECM. The valve controls the lock-up relay valve to perform torque converter lock-up and flexible lock-up functions.
The ECM compares the engine speed (NE) signal with the input turbine speed signal to detect torque converter lock-up. The ECM then compares the lock-up status with the lock-up schedule in the ECM memory. If the ECM does not detect lock-up at the appropriate time, it will conclude that there is a malfunction in shift solenoid valve SL. The ECM will illuminate the MIL and store the DTC.

INSPECTION PROCEDURE

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

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

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

  1. Read the DTCs using the intelligent 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 (HILUX_TGN26 RM0000030G907SX.html)
A


2.INSPECT SHIFT SOLENOID VALVE SL


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.A343E Automatic Transmission Transaxle.Automatic Transmission System (For 2Tr-Fe). Dtc P0741 Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve Sl)

  1. Remove shift solenoid valve SL.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    Shift solenoid valve SL connector terminal - Shift solenoid valve SL body
    		20°C (68°F)
    		11 to 15 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 SL connector
    2. Battery negative (-) → Shift solenoid valve SL body
    		Valve moves and makes an operating noise
Text in Illustration
*a
Component without harness connected
(Shift Solenoid Valve SL)


NG
REPLACE SHIFT SOLENOID VALVE SL (HILUX_TGN26 RM0000013BC01VX.html)
OK


3.INSPECT TRANSMISSION VALVE BODY ASSEMBLY

  1. Check the transmission valve body assembly (HILUX_TGN26 RM0000013BC01VX.html).

    OK:
    There are no foreign objects on any valve.


NG
REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY (HILUX_TGN26 RM0000013B001UX.html)
OK


4.INSPECT TORQUE CONVERTER ASSEMBLY

  1. Check the torque converter assembly (HILUX_TGN26 RM0000010NN01PX.html).

    OK:
    The torque converter operates normally.


NG
REPLACE TORQUE CONVERTER ASSEMBLY (HILUX_TGN26 RM0000010NV02OX.html)
OK

REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY (HILUX_TGN26 RM0000010NV02OX.html)