Dtc P2759 Torque Converter Clutch Pressure Control Solenoid Control Circuit Electrical (Shift Solenoid Valve Slu)

Transmission. Lexus Is250, Is220D. Gse20 Ale20
A960E Automatic Transmission. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT TRANSMISSION WIRE (SLU)

CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)

INSPECT SHIFT SOLENOID VALVE SLU

DTC P2759 Torque Converter Clutch Pressure Control Solenoid Control Circuit Electrical (Shift Solenoid Valve SLU)


DESCRIPTION

The amount of current flow to the solenoid is controlled by the (*) duty ratio of the ECM output signal. The higher the duty ratio becomes, the higher the lock-up hydraulic pressure becomes during the lock-up operation.
Lexus Is250, Is220D. Gse20 Ale20.A960E Automatic Transmission.Automatic Transmission System. Dtc P2759 Torque Converter Clutch Pressure Control Solenoid Control Circuit Electrical (Shift Solenoid Valve Slu)
(*) Duty Ratio
The duty ratio is the ratio of the period of continuity in one cycle. For example, if A is the period of continuity in one cycle, and B is the period of non-continuity, then Duty Ratio = A/(A+B) x 100(%).

DTC No.
DTC Detection Condition
Trouble Area
P2759
Open or short is detected in shift solenoid valve SLU circuit for 1 second or more while driving (1-trip detection logic).
  1. Open or short in shift solenoid valve SLU circuit
  2. Shift solenoid valve SLU
  3. ECM
Reference (Using an oscilloscope):
Check the waveform between the terminals SLU+ and SLU- of the ECM connector
Lexus Is250, Is220D. Gse20 Ale20.A960E Automatic Transmission.Automatic Transmission System. Dtc P2759 Torque Converter Clutch Pressure Control Solenoid Control Circuit Electrical (Shift Solenoid Valve Slu)
Standard:
Refer to the illustration.
Terminal
SLU+ - SLU-
Tool setting
5 V/DIV., 1 ms./DIV.
Vehicle condition
5th (lock-up) or 6th (lock-up) gear

MONITOR DESCRIPTION

When an open or short in a shift solenoid valve (SLU) circuit is detected, the ECM determines there is a malfunction. The ECM will turn on the MIL and store this DTC.

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.A960E Automatic Transmission.Automatic Transmission System. Dtc P2759 Torque Converter Clutch Pressure Control Solenoid Control Circuit Electrical (Shift Solenoid Valve Slu)


INSPECTION PROCEDURE

1.INSPECT TRANSMISSION WIRE (SLU)


    Lexus Is250, Is220D. Gse20 Ale20.A960E Automatic Transmission.Automatic Transmission System. Dtc P2759 Torque Converter Clutch Pressure Control Solenoid Control Circuit Electrical (Shift Solenoid Valve Slu)

  1. Disconnect the transmission wire connector from the transmission.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    20°C (68°F)
    12 (SLU+) - 4 (SLU-)
    		5.0 to 5.6 Ω

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

    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    12 (SLU+) - Body ground
    		10 kΩ or higher
    4 (SLU-) - Body ground
    		↑


NG
Go to step 3
OK


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


    Lexus Is250, Is220D. Gse20 Ale20.A960E Automatic Transmission.Automatic Transmission System. Dtc P2759 Torque Converter Clutch Pressure Control Solenoid Control Circuit Electrical (Shift Solenoid Valve Slu)

  1. Connect the transmission wire connector to the transmission.

  1. Disconnect the ECM connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    20°C (68°F)
    E4-13 (SLU+) - E4-12 (SLU-)
    		5.0 to 5.6 Ω

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

    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    E4-13 (SLU+) - Body ground
    		10 kΩ or higher
    E4-12 (SLU-) - Body ground
    		↑


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM

3.INSPECT SHIFT SOLENOID VALVE SLU


    Lexus Is250, Is220D. Gse20 Ale20.A960E Automatic Transmission.Automatic Transmission System. Dtc P2759 Torque Converter Clutch Pressure Control Solenoid Control Circuit Electrical (Shift Solenoid Valve Slu)

  1. Remove the shift solenoid valve SLU.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    20°C (68°F)
    1 - 2
    		5.0 to 5.6 Ω

  1. Connect the positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector, then check the movement of the valve.

    OK:
    The solenoid makes an operating sound.


NG
REPLACE SHIFT SOLENOID VALVE SLU
OK

REPAIR OR REPLACE TRANSMISSION WIRE