Kia Optima: Engine Control System / Variable Charge Motion Actuator (VCMA)

Kia Optima DL3 2019-2022 Service and Repair Manual / Engine Control / Fuel System / Engine Control System / Variable Charge Motion Actuator (VCMA)

Description and operation

The Variable Charge Motion Actuator (VCMA) is installed on the inlet of the intake manifold.

It consists of a DC motor which actuates the VCM valve and a position sensor which detects the position of the VCM valve.

The VCM system tumbles air flow entering into combustion chamber of each cylinder by closing the VCM valve in the cold start conditions.

This tumble effect reduces cold start emissions by improving atomization

Components and components location

1. Variable Charge Motion Actuator (VCMA)

Schematic diagrams
Circuit diagram

Harness Connector

Repair procedures

The engine control system can be more quickly diagnosed for troubles by using the vehicle diagnostic system (KDS). (Refer to "DTC guide")

KDS provides the following information.


Self diagnosis : Inspects and displays diagnostic trouble code (DTC)


Sensor data : Checks the system input/output value status


Forced operation : Checks the system operating status


Additional function : Controls system options, zero point adjustment and other functions


Disconnect the negative battery terminal.


Disconnect the PCV hose (A).


Disconnect the VCMA connector (A).


Remove the VCMA mounting bolts (B).

Tightening torque :

9.8 - 11.8 N·m (1.0 - 1.2 kgf·m, 7.2 - 8.7 lb·ft)


Remove the VCMA (A).


Install the component with the specified torque.

Note that internal damage may occur when the component is dropped. In this case, use it after inspecting.

The VCM actuator has to be installed at the fully closing positon of the VCM valve.

If it doesn't, the VCM coupling of the VCM shaft can't be put in the VCM actuator.


Install in the reverse order of removal.

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