Functional description

The DDE control unit opens and closes the throttle valve actuator electrically. The throttle valve's precise current position must be registered at all times to as a condition for optimal control. This function is discharged by the throttle-valve sensor, which provides contactless monitoring of the throttle valve's position within the throttle-valve actuator.

Fig 1: Throttle Actuator, Throttle Valve, Five Pin Plug Connection

Courtesy of BMW OF NORTH AMERICA, INC.

When no power is being applied spring force holds the throttle valve open within the throttle-valve actuator.