Sensor-Variable Line Pressure: Description

Fig 1: Identifying Variable Line Pressure Sensor & Pressure Control Solenoid

Courtesy of CHRYSLER LLC

The line pressure sensor (2) is mounted on the top of the valve body, next to the pressure control solenoid (1). See Fig 1.

The TCM utilizes a closed-loop system to control transmission line pressure. The system contains a variable force style solenoid, the Pressure Control Solenoid. The solenoid is duty cycle controlled by the TCM to vent the unnecessary line pressure supplied by the oil pump back to the sump. The system also contains a variable pressure style sensor, the Line Pressure Sensor, which is a direct input to the TCM. The line pressure solenoid monitors the transmission line pressure and completes the feedback loop to the TCM. The TCM uses this information to adjust its control of the pressure control solenoid to achieve the desired line pressure.