Linear Solenoid,

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Fig 1: Identifying Line Pressure Solenoid SLS

Courtesy of VOLVO CARS CORPORATION

The line pressure solenoid, is in the transmission control system, which is mounted on the front edge of the transmission. The line pressure solenoid, consists of an electrical coil which controls a hydraulic valve. The solenoid is controlled by pulse width modulation (PWM) voltage. The solenoid is grounded via the transmission control module (TCM). The hydraulic function of the solenoid is linear. The hydraulic valve is controlled by the varied current which is the result of the pulse conditions. During high pulse conditions, (at high currents) the line pressure is low. During low pulse conditions the line pressure is high. In the event of an open-circuit the line pressure reaches maximum which causes hard shifting. The hydraulic valve is then completely open.

There are diagnostics for the solenoid.

Fig 1: Identifying Line Pressure Solenoid

Courtesy of VOLVO CARS CORPORATION

The line pressure solenoid, is in the transmission control system, which is mounted on the front edge of the transmission. The line pressure solenoid, consists of an electrical coil which controls a hydraulic valve. The solenoid is controlled by pulse width modulation (PWM) voltage. The solenoid is grounded via the transmission control module (TCM). The hydraulic function of the solenoid is linear. The hydraulic valve is controlled by the varied current which is the result of the pulse conditions. During high pulse conditions, (at high currents (approximately 1 A)) the line pressure is low. During low pulse conditions (at low currents) the line pressure is high. In the event of an open-circuit the line pressure reaches maximum which causes hard shifting. The hydraulic valve is then completely open.

There are diagnostics for the solenoid.