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Ratio Control Motor

The Ratio Control Motor is housed inside the transmission, adjacent to the oil cooler pipe connections. The motor and solenoids are connected to the main harness via a circular connector. The motor is operational in all transmission modes and controls the hydraulic control unit to adjust the primary pulley to the appropriate position.

Fig 1: Ratio Control Motor
G04724783Courtesy of BMW OF NORTH AMERICA, INC.

The motor which controls the transmission ratio is a linear actuator and a bi-polar stepper motor.