Shift Solenoids

Courtesy of FORD MOTOR COMPANY

This transmission utilizes six shift solenoids (A-F) that are normally low CIDAS. Unlike previous shift solenoids they are mechanical in nature in that no transmission fluid passes through them. CIDASs use an armature/pin assembly that moves a control valve in the main control valve body to control and apply hydraulic fluid pressure. Each clutch (A-F) has a corresponding shift solenoid (A-F) that is directly proportional in that zero current equals zero pressure and maximum current equals maximum pressure. Since there is no pressure with zero current if the power is interrupted to the shift solenoids none of the clutch packs are able to engage.