Circuit Description

The shift 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 engine control module (ECM) 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.

When an open or short in the linear solenoid valve (SLT) is detected, the ECM interprets this as a fault. The ECM will illuminate the MIL and store the DTC.