AUTOMATIC TRANSMISSION SYSTEM, Diagnostic DTC:P2759

DTC Code DTC Name
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. During the lock-up operation, if the duty ratio increases, the lock-up hydraulic pressure increases.

A0098VIE01

Tech Tips

*: The duty ratio is the ratio of the current ON time (A) to the total of the current ON and OFF time (A + B).

Duty Ratio (%) = A / (A + B) x 100

DTC Code DTC Detection Condition Trouble Area
P2759 Open or short is detected in the shift solenoid valve SLU circuit for 1 second or more while driving (1-trip detection logic).

  • Open or short in shift solenoid valve SLU circuit

  • Shift solenoid valve SLU

  • ECM

Reference: Inspect using an oscilloscope.

Check the waveform of the ECM connector.

Standard
Terminal No. (Symbol) Tool Setting Condition Specified Condition
C63-20 (SLU+) - C63-21 (SLU-) 5 V/DIV., 1 msec./DIV. 3rd gear (lock-up) or 4th gear (lock-up) Refer to illustration
A0097QGE02

MONITOR DESCRIPTION

When an open or short in the shift solenoid valve SLU circuit is detected, the ECM determines that there is a malfunction. The ECM will illuminate the MIL and store the DTC.

WIRING DIAGRAM

A0096X8E02

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SLU)


    1. A0094X2E05
      Text in Illustration
      *a

      Component without harness connected

      (Transmission Wire)

      Disconnect the C58 transmission wire connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (SLU+) - 7 (SLU-) 20°C (68°F) 5.1 to 5.5 Ω
      3 (SLU+) - Body ground Always 10 kΩ or higher
      7 (SLU-) - Body ground Always 10 kΩ or higher

    NG

    Click here

    OK

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


    1. A0099WBE08
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to ECM)

      Disconnect the C63 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C63-20 (SLU+) - C63-21 (SLU-) 20°C (68°F) 5.1 to 5.5 Ω
      C63-20 (SLU+) - Body ground Always 10 kΩ or higher
      C63-21 (SLU-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here

  3. INSPECT SHIFT SOLENOID VALVE SLU


    1. A00XBX1E04
      Text in Illustration
      *a

      Component without harness connected

      (Shift Solenoid Valve SLU)

      Remove shift solenoid valve SLU.

    2. 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) 5.1 to 5.5 Ω

    3. 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

      • Battery positive (+) with a 21 W bulb → Terminal 2

      • Battery negative (-) → Terminal 1

      		 Valve moves and makes an operating noise

    NG

    REPLACE SHIFT SOLENOID VALVE SLU Click here

    OK

    REPAIR OR REPLACE TRANSMISSION WIRE Click here