AUTOMATIC TRANSMISSION SYSTEM, Diagnostic DTC:P2716/77

DTC Code DTC Name
P2716/77 Pressure Control Solenoid "D" Electrical (Shift Solenoid Valve SLT)

DESCRIPTION

A01E1D5E02

The throttle pressure that is applied to the primary regulator valve (which modulates the line pressure) causes the solenoid valve SLT, under electronic control, to precisely modulate and generate the line pressure according to the extent that the accelerator pedal is depressed or the output of engine power.

This controls the line pressure and provides smooth shifting characteristics.

Upon receiving a signal of the throttle valve opening angle, the TCM controls the line pressure by sending a predetermined duty ratio* to the solenoid valve, modulating the line pressure and generating throttle pressure.

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).

A01E0ZCE05

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

DTC No. DTC Detection Condition Trouble Area
P2716/77 TCM detects shift solenoid valve SLT circuit malfunction for 1 sec. or more (1 trip detection logic)

  • Open or short in shift solenoid valve SLT circuit

  • Shift solenoid valve SLT

  • TCM

WIRING DIAGRAM

A01DVZXE06

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SLT)


    1. A01E2EKE02

      Disconnect the E1 wire connector.

    2. Measure the resistance of the transmission wire.

      Standard resistance
      Tester Connection Condition Specified Condition
      2 (SLT+) - 6 (SLT-) 20°C (68°F) 5.0 to 5.6 Ω
      2 (SLT+) - Body ground 20°C (68°F) 10 kΩ or higher
      6 (SLT-) - Body ground 20°C (68°F) 10 kΩ or higher

    NG

    INSPECT SHIFT SOLENOID VALVE SLT Click here

    OK

  2. CHECK WIRE HARNESS (SHIFT SOLENOID VALVE SLT - TCM)


    1. A01DWWJE06

      Disconnect the T19 TCM connector.

    2. Measure the resistance of the wire harness side connector.

      Standard resistance
      Tester Connection Condition Specified Condition
      T19-20 (SLT+) - T19-19 (SLT-) 20°C (68°F) 5.0 to 5.6 Ω
      T19-20 (SLT+) - Body ground 20°C (68°F) 10 kΩ or higher
      T19-19 (SLT-) - Body ground 20°C (68°F) 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE TCM

  3. INSPECT SHIFT SOLENOID VALVE SLT


    1. A01DWV8E25

      Remove the shift solenoid valve SLT.

    2. Measure the resistance between the solenoid valve terminal and solenoid valve body.

      Standard resistance
      5.0 to 5.6 Ωat 20°C (68°F)

    3. 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.

    4. Check the operating noise of terminal 1 of the solenoid valve.

      OK
      Solenoid makes operating noise.

      Tech Tips

      Reference: Inspection using an oscilloscope.

      A01E2XME02

      Check the waveform of the TCM connector.

      OK
      Refer to illustration
      Item Content
      Tester Connection T19-20 (SLT+) - T19-19 (SLT-)
      Tool Setting 5 V/DIV., 1 msec./DIV.
      Condition Engine idle speed

    NG

    REPLACE SHIFT SOLENOID VALVE SLT

    OK

    REPLACE TRANSMISSION WIRE