Variable Charge Motor Actuator (VCMA)

Description and Operation

Description

• The variable charge motion actuator (VCMA) is installed at the intake manifold inlet.

• It consists of a DC motor that drives the VCM valve, and a position sensor that detects the position of the VCM valve.

• The VCM system creates a swirl of the intake air flowing into each cylinder combustion chamber by closing the VCM valve during cold start conditions.

• This swirl effect reduces cold start emissions by improving fuel atomization.

Components and Component Location

Components

Circuit Diagrams

Wiring Diagram

Harness Connector

Repair Procedures

Inspection

1. The engine control system can be diagnosed more quickly for malfunctions using the Kia Diagnostic System (KDS). (Refer to Diagnostic Trouble Code Guide)

   KDS provides the following information.

   1. Self-diagnosis: Checks and displays diagnostic trouble codes (DTC).

   2. Data list: Checks the input/output values of the system.

   3. Active test: Checks the operating condition of the system.

   4. Additional functions: System option control, zero point adjustment, and other functions.

Removal

1. 1

   Disconnect the negative battery cable.

2. 2

   Disconnect the PCV hose (A).

   

3. 3

   Disconnect the VCMA connector (A).

4. 4

   Remove the VCMA mounting bolts (B).

   Tightening Torque: 9.8–11.8 N·m

   

5. 5

   Remove the VCMA (A).

   

Installation

1. Install in the reverse order of removal.