Linear Pressure Solenoid, SLT
The linear pressure solenoid, SLT is located in the transmission control system, which is fitted on the front edge of the gearbox. The linear pressure solenoid, SLT consists of an electrical coil which controls a hydraulic valve. The solenoid is controlled with a pulsed (PWM) voltage and is grounded via the transmission control module (TCM). The hydraulic function of the solenoid is linear. The hydraulic valve is controlled by the varying current resulting from the current pulse ratio. With a high pulse ratio, i.e. high current strength (approx. 1 A), the system pressure is low, and with a low pulse ratio, i.e. low current strength, the system pressure is high. In the event of an open circuit the system pressure is at a maximum which results in hard gearshifts. Here the hydraulic valve is fully open.
The solenoid can be diagnosed.