Solenoid S1 And S2
The solenoids S1 and S2 are located in the transmission control system, which is fitted on the front edge of the gearbox. The solenoids are the on/off type, and consist of an electrical coil which controls a hydraulic valve. The solenoids are supplied with 12 V power via the transmission control module (TCM) and are grounded in the control system. Solenoid S1 controls certain shifting and the transmission control module (TCM) activates solenoid S2 at engine braking for 1st gear.
The solenoids can be diagnosed.