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

Drivetrain. Corolla. Zre142 Aze141
U250E Automatic Transmission Transaxle. Corolla. Zre142 Aze141

SYSTEM DESCRIPTION

MONITOR DESCRIPTION

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

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 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 assembly.

DTC No.
DTC Detection Condition
Trouble Area
P0741
Lock-up does not occur when driving in lock-up range
Lock-up remains ON in 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 assembly
  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 assembly.
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 either 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 100 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.)

MONITOR STRATEGY


Related DTCs
P0741:
Shift solenoid valve DSL/OFF malfunction
Shift solenoid valve DSL/ON malfunction
Required sensors/Components
Shift solenoid valve DSL, Speed sensor (NT), Speed sensor (NC), Crankshaft position sensor (NE), Throttle position sensor (VPA1), Mass air flow sensor (MAF), Transmission temperature sensor (THO1), Engine coolant temperature sensor (ECT)
Frequency of operation
Continuous
Duration
OFF malfunction (A)
Continuous
OFF malfunction (B)
1 sec.
OFF malfunction (C)
3.5 sec.
ON malfunction
1.8 sec.
MIL operation
2 driving cycles
Sequence of operation
None

TYPICAL ENABLING CONDITIONS


All:
The monitor will run whenever this DTC is not present.
(Not circuit malfunction)
P0712, P0713 (ATF temperature sensor circuit)
P0115, P0117, P0118 (ECT sensor circuit)
P0717 (Turbine speed sensor circuit)
P0793 (Intermediate shaft speed sensor circuit)
P0500 (Vehicle speed sensor circuit)
P0748 (Shift solenoid valve SL1 circuit)
P0778 (Shift solenoid valve SL2 circuit)
P0798 (Shift solenoid valve SL3 circuit)
P0982, P0983 (Shift solenoid valve S4 circuit)
P0985, P0986 (Shift solenoid valve SR circuit)
P2769, P2770 (Shift solenoid valve DSL circuit)
P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0604, P0606, P0607, P060A, P060D, P060E, P0657, P1607, P2102, P2103, P2111, P2112, P2118, P2119, P2135 (Electronic throttle system)
ECT (Engine coolant temperature)
10°C (50°F) or more
Transmission range
"D"
TFT (Transmission fluid temperature)
-20°C (-4°F) or more

OFF malfunction (A):
ECM selected gear
3rd
Throttle valve opening angle
4.5% or more at engine speed 1900 rpm (varies with engine speed)

OFF malfunction (B):
ECM selected gear
5th
Vehicle speed
10 km/h (6 mph) or more

OFF malfunction (C):
ECM lock-up command
ON
ECM selected gear
3rd, 4th or 5th
Vehicle speed
25 km/h (16 mph) or more

ON malfunction:
ECM lock-up command
OFF
ECM selected gear
3rd, 4th or 5th
Throttle valve opening angle
8.5% or more
Vehicle speed
3rd
25 to 60 km/h (16 to 37 mph)
4th, 5th
25 to 120 km/h (16 to 75 mph)

TYPICAL MALFUNCTION THRESHOLDS

Either of the following conditions is met: OFF malfunction or ON malfunction

OFF malfunction:
Engine speed - Input (turbine) speed
When condition "OFF" malfunction (A)" of shift solenoid "D" is detected;
75 rpm or more
Engine speed - Input (turbine) speed
When condition "OFF" malfunction (A)" of shift solenoid "D" is not detected;
100 rpm or more

ON malfunction:
Difference between engine speed and input (turbine) speed
Less than 35 rpm

INSPECTION PROCEDURE

NOTICE:
Perform the universal trip to clear permanent DTCs (COROLLA_ZRE142 RM000000W770S6X.html).
HINT:
Using Techstream to perform Active Test 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 Test early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Test.

PERFORM ACTIVE TEST

  1. Warm up the engine.

  2. Turn the ignition switch off.

  3. Connect Techstream to the DLC3.

  4. Turn the ignition switch to the on position.

  5. Select the item "Powertrain / Engine and ECT / Active Test".

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

    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Activate the Lock Up
    		[Test Details]
    Control the shift solenoid DSL to set the automatic transaxle to the lock-up condition.
    [Vehicle Condition]
    1. Throttle valve opening angle: Less than 35 %
    1. Vehicle Speed: 60 km/h (37 mph) or more
    		ON/OFF
    		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 in the 5th gear.


  7. 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.)

    Corolla. Zre142 Aze141.U250E Automatic Transmission Transaxle.Automatic Transaxle System. Dtc P0741 Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve Dsl)

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

  1. Connect Techstream to the DLC3.

  1. Turn the ignition switch to the on position and turn the Techstream main switch ON.

  1. When you use Techstream:
    Select the item "Powertrain / Engine and ECT / Trouble Codes".

  1. Read the DTCs using Techstream.

    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 (COROLLA_ZRE142 RM000000W710LJX.html)
A


2.INSPECT TRANSMISSION WIRE (DSL)


    Corolla. Zre142 Aze141.U250E Automatic Transmission 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
    		Condition
    		Specified Condition
    10 - Body ground
    		20°C (68°F)
    		11 to 13 Ω


NG
Go to step 4
OK


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


    Corolla. Zre142 Aze141.U250E Automatic Transmission 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
    		 Condition
    		Specified Condition
    B31-79 (DSL) - Body ground
    		20°C (68°F)
    		11 to 13 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.INSPECT SHIFT SOLENOID VALVE DSL


    Corolla. Zre142 Aze141.U250E Automatic Transmission 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
    		Condition
    		Specified Condition
    Solenoid Connector (DSL) - Solenoid Body (DSL)
    		20°C (68°F)
    		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 (COROLLA_ZRE142 RM00000109S01BX.html)
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 (COROLLA_ZRE142 RM000000YWZ01QX.html)
OK


6.INSPECT 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 (COROLLA_ZRE142 RM000000YWX02NX.html)
OK


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


NG
REPLACE TORQUE CONVERTER ASSEMBLY
OK

REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY (COROLLA_ZRE142 RM000000YWV032X.html)