Dtc P2757 Torque Converter Clutch Pressure Control Solenoid Control Circuit Performance Or Stuck Off

Drivetrain. Land Cruiser. Urj200, 202 Grj200 Vdj200
Ae80F 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 Control Circuit Performance or Stuck OFF


DESCRIPTION

The TCM controls the lock-up solenoid, and performs lock-up and flex lock-up control.
The TCM compares the engagement condition of the lock-up clutch with the lock-up schedule in the TCM memory to detect shift solenoid valve SLU, transmission valve body assembly and torque converter mechanical problems.

Land Cruiser. Urj200, 202 Grj200 Vdj200.Ae80F Automatic Transmission Transaxle.Automatic Transmission System. Dtc P2757 Torque Converter Clutch Pressure Control Solenoid Control Circuit Performance Or Stuck Off


DTC No.
DTC Detection Condition
  1. Diagnosis Condition
  2. Malfunction Status
  3. Malfunction Time
  4. Other
Trouble Area
P2757
  1. Battery voltage is 9.5 V or higher, engine speed is more than 400 rpm, and the vehicle is driven with the shift lever in D (no malfunctions are detected in shift solenoid valve SC1, SC2, SL1, SL2, SL3, SL4, SL5, SLT, SLU, park/neutral position switch assembly, TCM, electronic throttle, knock control sensor, No. 1 ATF temperature sensor, transmission revolution sensors (NT), and CAN communication system)
  2. When the TCM commands lock-up OFF, the difference between the input turbine speed (NT) and the engine speed (NE) is less than 30 rpm
  3. Malfunction status is detected 2 times per trip
  4. 2 trip detection logic
  1. Shift solenoid valve SLU
  2. Transmission valve body assembly
  3. Torque converter assembly
  4. Automatic transmission assembly (clutch, brake, gear, etc.)
  1. Battery voltage is 9.5 V or higher, engine speed is more than 400 rpm, and the vehicle is driven with the shift lever in D (no malfunctions are detected in shift solenoid valve SC1, SC2, SL1, SL2, SL3, SL4, SL5, SLT, SLU, park/neutral position switch assembly, TCM, electronic throttle, knock control sensor, No. 1 ATF temperature sensor, transmission revolution sensors (NT), and CAN communication system)
  2. When the TCM commands lock-up ON, the difference between the input turbine speed (NT) and the engine speed (NE) is 100 rpm or more
  3. Malfunction status is detected 6 times per trip
  4. 2 trip detection logic
  1. Shift solenoid valve SLU
  2. Transmission valve body assembly
  3. Torque converter assembly
  4. Automatic transmission assembly (clutch, brake, gear, etc.)

MONITOR DESCRIPTION

Torque converter lock-up is controlled by the TCM based on the transmission revolution sensor (NT), engine speed, engine load, engine coolant temperature, vehicle speed, transmission fluid temperature and gear selection. The TCM determines the lock-up status of the torque converter by comparing the engine speed (NE) to the input turbine speed (NT). The TCM calculates the actual transmission gear by comparing the input turbine speed (NT) to the output shaft speed (SP2). When conditions are appropriate, the TCM requests "lock-up" by applying control voltage to the shift solenoid valve SLU. When the shift solenoid valve SLU is turned on, it applies pressure to the lock-up relay valve and locks the torque converter assembly.
If the TCM detects no lock-up after lock-up has been requested or if it detects lock-up when it is not requested, the TCM interprets this as a malfunction of the shift solenoid valve SLU, and stores this DTC.
HINT:
Example:
When any of the following is met, the system judges it as 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 when the TCM commands lock-up. (Engine speed is at least 100 rpm more than 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 when the TCM commands lock-up off. (The difference between engine speed and input turbine speed is less than 30 rpm.)

INSPECTION PROCEDURE

NOTICE:
Perform registration and/or initialization when parts related to the automatic transmission are replaced (Click here).
HINT:
  1. (Only for vehicles with an AE80F automatic transmission.)
    1. When an engine stall occurs, control is performed to cut the clutch oil pressure inside the automatic transmission. After the engine is restarted, the vehicle will not creep, even if the shift lever is in D or R.
    2. With the brake pedal released, slowly depress the accelerator pedal until the vehicle begins to move. This cancels the control and makes it possible for the vehicle to creep.
  2. After performing repair, clear the DTCs and perform the following procedure to check that DTCs are not output.
    1. Perform the Lock-up Function in Road Test (Click here).*1
    2. Turn the engine switch off.
    3. Perform step (*1) again.
    4. Check for DTCs again (Click here).
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 / ECT / Trouble Codes.

  1. Read the DTCs using the GTS.

    Result
    Result
    		Proceed to
    Only DTC P2757 is output
    		A
    DTC 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.Ae80F Automatic Transmission Transaxle.Automatic Transmission System. Dtc P2757 Torque Converter Clutch Pressure Control Solenoid Control Circuit Performance Or Stuck Off

  1. Remove the shift solenoid valve SLU (Click here).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    Terminal 1 of the shift solenoid valve SLU - Terminal 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
*1
Shift Solenoid Valves 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 is no foreign matter on each valve and they operate smoothly.


NG
REPAIR OR 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 operates normally.


NG
REPLACE TORQUE CONVERTER ASSEMBLY (Click here)
OK

REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY (Click here)