Actuator Variable Intake Manifold

Fig 1: Identifying Actuators, Variable, Intake Manifold

Courtesy of VOLVO CARS CORPORATION

1. Primary actuator with throttle (upper)
2. Secondary actuator with throttle (lower)

The function of the actuators is to vary the length of the intake manifold, via throttles installed in the intake manifold.

The actuators are supplied with voltage from the system relay via fuse and ground (control) internally in the engine control module (ECM).

see VARIABLE INTAKE SYSTEM 

The actuators for variable intake can be diagnosed by the engine control module (ECM).

The actuators are bolted directly to the intake manifold.