Dtc P2757 Torque Converter Clutch Pressure Control Solenoid Performance (Shift Solenoid Valve Slu)

Drivetrain. Land Cruiser. Urj200, 202 Grj200 Vdj200
Ab60F Automatic Transmission Transaxle. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

MONITOR DESCRIPTION

INSPECTION PROCEDURE

CHECK DTC OUTPUT (IN ADDITION TO DTC P2757)

INSPECT SHIFT SOLENOID VALVE SLU

INSPECT TRANSMISSION VALVE BODY ASSEMBLY

INSPECT TORQUE CONVERTER ASSEMBLY

DTC P2757 Torque Converter Clutch Pressure Control Solenoid Performance (Shift Solenoid Valve SLU)


DESCRIPTION

The ECM uses the signals from the throttle position sensor, air-flow meter, turbine (input) speed sensor, output speed sensor and crankshaft position sensor to monitor the engagement condition of the lock-up clutch.

Land Cruiser. Urj200, 202 Grj200 Vdj200.Ab60F Automatic Transmission Transaxle.Automatic Transmission System (For 1Ur-Fe). Dtc P2757 Torque Converter Clutch Pressure Control Solenoid Performance (Shift Solenoid Valve Slu)

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 SLU, valve body and torque converter assembly.

DTC Code
DTC Detection Condition
Trouble Area
P2757
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 SLU remains open or closed
  2. Valve body is blocked
  3. Shift solenoid valve SLU
  4. Torque converter assembly
  5. Automatic transmission (clutch, brake, gear, etc.)
  6. Line pressure is too low

MONITOR DESCRIPTION

Torque converter assembly lock-up is controlled by the ECM based on the turbine (input) speed sensor NT, output speed sensor SP2, engine speed, engine load, engine temperature, vehicle speed, transmission temperature and gear selection. The ECM determines the lock-up status of the torque converter assembly by comparing the engine speed (NE) to the input turbine speed (NT). The ECM calculates the actual transmission gear by comparing input turbine speed (NT) to the output shaft speed (SP2). When conditions are appropriate, the ECM requests lock-up by applying control voltage to the shift solenoid SLU. When the SLU 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 SLU or lock-up system performance.
The ECM will illuminate the MIL and store the DTC.
Example:
When one of the following conditions 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 assembly when the ECM commands lock-up ON.
    Engine speed is at least 70 rpm more 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 assembly 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:
Using the GTS 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 engine switch off.

  3. Connect the GTS to the DLC3.

  4. Turn the engine switch on (IG).

  5. Turn the GTS on.

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

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

    Engine and ECT
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Activate the Lock Up
    		Control shift solenoid SLU to set automatic transmission to lock-up
    		ON or OFF
    		Possible to check shift solenoid valve SLU operation.
    [Vehicle Condition]
    1. Throttle valve opening angle: Less than 35%
    2. Vehicle speed: 80 km/h (50 mph) or more
    HINT:
    1. This test can be conducted when the vehicle speed is 80 km/h (50 mph) or more.
    2. Perform this test while driving in 5th or 6th gear.


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


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Ab60F Automatic Transmission Transaxle.Automatic Transmission System (For 1Ur-Fe). Dtc P2757 Torque Converter Clutch Pressure Control Solenoid Performance (Shift Solenoid Valve Slu)

    HINT:
    1. When changing the accelerator pedal opening angle while driving, if the engine speed does not change rapidly, 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 DTC OUTPUT (IN ADDITION TO DTC P2757)

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG).

  1. Turn the GTS on.

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

  1. Read the DTCs using the GTS.

    Result
    Result
    		Proceed to
    Only P2757 is output
    		A
    P2757 and other DTCs are output
    		B
    HINT:
    If any other codes besides P2757 are output, perform troubleshooting for those DTCs first.


B
GO TO DTC CHART (Click here)
A


2.INSPECT SHIFT SOLENOID VALVE SLU


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Ab60F Automatic Transmission Transaxle.Automatic Transmission System (For 1Ur-Fe). Dtc P2757 Torque Converter Clutch Pressure Control Solenoid Performance (Shift Solenoid Valve Slu)

  1. Remove shift solenoid valve SLU.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 - 2
    		20°C (68°F)
    		5.0 to 5.6 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 (+) with a 21 W bulb → Terminal 2
    2. Battery negative (-) → Terminal 1
    		Valve moves and makes an operating noise
Text in Illustration
*a
Component without harness connected
(Shift Solenoid Valve SLU)


NG
REPLACE SHIFT SOLENOID VALVE SLU (Click here)
OK


3.INSPECT TRANSMISSION VALVE BODY ASSEMBLY

  1. Check the transmission valve body assembly (Click here).

    OK:
    There are no foreign objects on each valve.


NG
REPLACE TRANSMISSION VALVE BODY ASSEMBLY (Click here)
OK


4.INSPECT TORQUE CONVERTER ASSEMBLY

  1. Check the torque converter assembly (Click here).

    OK:
    The torque converter assembly operates normally.


NG
REPLACE TORQUE CONVERTER ASSEMBLY (Click here)
OK

REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY (Click here)