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

Kia Optima DL3 2019-2023 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.

Variable Intake Solenoid (VIS) Valve
Specifications Specification Item Specification Coil resistance (Ω) 30.0 - 35.0 [22°C (71.6°F)] Description and op ...

Fuel Delivery System
Fuel pressure test Fuel Pressure Test 1. Release the residual pressure in fuel line. (Refer to Fuel Delivery System - "Release Residual Pressure in Fuel Line") ...

Other information:

Kia Optima DL3 2019-2023 Service and Repair Manual: Rear Seat Back Cover

Components and components location Component Location 1. Rear seat back cover Repair procedures Replacement 1. Remove the rear seat assembly. (Refer to Rear Seat - "Rear Seat Assembly") 2. ...

Kia Optima DL3 2019-2023 Owner's Manual: Driver position memory system (for power seat)

A driver position memory system is provided to store and recall the driver seat and outside rearview mirror position with a simple button operation. By saving the desired position into the system memory, different drivers can reposition the driver seat based upon their driving preference. If ...

Copyright © 2017-2023