ELECTRONIC CONTROLLED AUTOMATIC TRANSMISSION SYSTEM, Diagnostic DTC:P2716/77

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

DESCRIPTION

The linear solenoid valve (SLT) controls the transmission line pressure for smooth transmission operation based on signals from the throttle position sensor and the vehicle speed sensor.

The TCM adjusts the duty cycle of the SLT solenoid valve to control hydraulic line pressure coming from the primary regulator valve. Appropriate line pressure assures smooth shifting with varying engine outputs.

(*): 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 (%)

A01BI43E03
DTC No. DTC Detection Condition Trouble Area
P2716/77 Open or short is detected in shift solenoid valve SLT circuit for 1 second or more while driving (1-trip detection logic).

  • Open or short in shift solenoid valve SLT circuit

  • Shift solenoid valve SLT

  • TCM

MONITOR DESCRIPTION

When an open or short in the linear solenoid valve (SLT) circuit is detected, the TCM interprets this as a fault.

The TCM will turn on the MIL and store the DTC.

WIRING DIAGRAM

A01BC8GE04

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT TRANSMISSION WIRE (SLT)


    1. A01BB7WE03

      Disconnect the transmission wire connector from the transmission.

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

      Resistance
      Tester Connection

      Specified Condition

      20°C (68°F)
      2 (SLT+) - 6 (SLT-) 5.0 to 5.6 Ω

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

      Resistance (Check for short)
      Tester Connection Specified Condition
      2 (SLT+) - Body ground 10 kΩ or higher
      6 (SLT-) - Body ground ↑

    NG

    INSPECT SHIFT SOLENOID VALVE SLT Click here

    OK

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


    1. A01BB2VE14

      Connect the transmission wire connector to the transmission.

    2. Disconnect the TCM connector.

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

      Resistance
      Tester Connection

      Specified Condition

      20°C (68°F)
      O1-20 (SLT+) - O1-19 (SLT-) 5.0 to 5.6 Ω

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

      Resistance (Check for short)
      Tester Connection Specified Condition
      O1-20 (SLT+) - Body ground 10 kΩ or higher
      O1-19 (SLT-) - Body ground ↑

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE TCM

  3. INSPECT SHIFT SOLENOID VALVE SLT


    1. A01BBTUE27

      Remove the shift solenoid valve (SLT).

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

      Resistance
      Tester Connection

      Specified Condition

      20°C (68°F)
      1 - 2 5.0 to 5.6 Ω

    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.

      OK
      The solenoid makes an operating sound.

    NG

    REPLACE SHIFT SOLENOID VALVE SLT

    OK

    REPAIR OR REPLACE TRANSMISSION WIRE