AUTOMATIC TRANSMISSION SYSTEM, Diagnostic DTC:P2716/77

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

DESCRIPTION

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 ECM 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).

A01E1B6E01

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

DTC Code DTC Detection Condition Trouble Area
P2716/77 ECM 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

  • ECM

WIRING DIAGRAM

A01E214E20

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SLT)


    1. A01DZRME02

      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 - ECM)


    1. A01DZE2E04

      Disconnect the E11 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E11-12 (SLT+) - E11-13 (SLT-) 20°C (68°F) 5.0 to 5.6 Ω
      E11-12 (SLT+) - Body ground 20°C (68°F) 10 kΩ or higher
      E11-13 (SLT-) - Body ground 20°C (68°F) 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE ECM

  3. INSPECT SHIFT SOLENOID VALVE SLT


    1. A01DWP5E05

      Remove the shift solenoid valve SLT.

    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) 5.0 to 5.6 Ω
    3. A01DWP8E01

      Connect the battery's positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector. Then check that the valve moves and makes an operating noise.

      OK
      Valve moves and makes an operating noise.

      Tech Tips

      Reference: Inspect using an oscilloscope.

      A01E2IFE04

      Check the waveform of the ECM connector.

      OK
      Refer to illustration
      Item Content
      Tester Connection E11-12 (SLT+) - E11-13 (SLT-)
      Tool Setting 5 V/DIV., 1 msec./DIV.
      Condition Engine is idling

    NG

    REPLACE SHIFT SOLENOID VALVE SLT

    OK

    REPLACE TRANSMISSION WIRE