Linear Pressure Solenoid SLC1, SLC2, SLC3 And SLB1
B8444S
Other engines
The linear pressure solenoids, SLC1, SLC2, SLC3 and SLB1 are located in the transmission control system, which is fitted on the front edge of the gearbox. The designation of the solenoid is linked to the component (clutch/brake band) that the solenoid controls. The linear pressure solenoids consist of an electrical coil which controls a hydraulic valve. The solenoids are controlled with a pulsed (PWM) voltage and are grounded via the transmission control module (TCM). The hydraulic function of the solenoids is linear. The hydraulic valves are 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 solenoids can be diagnosed.