System 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 ratio* 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 electrical current on time (A) to the total of the electrical current on and off time (A + B).

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

Fig 1: Identifying Shift Solenoid Valve SLT Components And Hydraulic Line Pressure Graph

DTC No.	DTC Detection Condition	Trouble Area
P2714	The ECM detects a malfunction in the shift solenoid valve SLT (ON side) according to the difference in the speed between the turbine and the output shaft, and also by the transmission fluid pressure. (2-trip detection logic)	Shift solenoid valve SLT remains open Shift solenoid valve SL1, SL2, SL3 or SL4 remains open or closed Valve body is blocked Automatic transaxle (clutch, brake or gear, etc.)