Automatic Torque Coupling (ATC) Solenoid
WARNING: This page is about a different car, the 2018 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
The Automatic Torque Coupling (ATC) solenoid applies clutch pressure as controlled by the AWD relay module to increase or decrease torque to the rear wheels. The Rear Drive Unit (RDU) transfers torque from the drive shaft to the rear differential depending on the specific request from the FWD system module (PCM). The Rear Drive Unit (RDU) and Automatic Torque Coupling (ATC) solenoid are serviced in Chassis, Driveline. Refer to: Rear Drive Axle and Differential .