Solenoid Valve: Description: Notes

TCM calculates the best condition using the information from all kinds of sensors. If the solenoid valve receives the information on the oil pressure, the solenoid valve actuates according to the driving signal. All kinds of regulators in the valve body are controlled to change the oil passage and also the line pressure is controlled by TCM.

Fig 1: Solenoid Valve Function Diagram

Courtesy of KIA MOTORS AMERICA, INC.

• PWM (Pulse Width Modulation) SOLENOID VALVE 

  Structure and functions

  PWM solenoid valve is composed of six solenoid valves and the oil capacity in the solenoid valve is changed by the electric duty value of TCM. The oil pressure of the valve body and the torque converter engages or disengages the damper clutch. The solenoid valves send the operating oil pressure to the clutches and brakes at the each range and also control the strength and weakness of oil pressure to reduce the shock when shifting the range.

  Fig 2: Identifying PWM (Pulse Width Modulation) Solenoid Valve Connector Terminals

  Courtesy of KIA MOTORS AMERICA, INC.
  Fig 3: Identifying PWM (Pulse Width Modulation) Solenoid Valve

  Courtesy of KIA MOTORS AMERICA, INC.