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

Kia Optima DL3 2019-2021 Service and Repair Manual / Engine Control / Fuel System / Engine Control System / Variable Charge Motion Actuator (VCMA)

Description and operation

Description

•	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

Components

1. Variable Charge Motion Actuator (VCMA)

Schematic diagrams

Circuit diagram

Harness Connector

Repair procedures

Inspection

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.

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

(2)	Sensor data : Checks the system input/output value status

(3)	Forced operation : Checks the system operating status

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

Removal

1.	Disconnect the negative battery terminal.

2.	Disconnect the PCV hose (A).

3.	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)

5.	Remove the VCMA (A).

Installation

•	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.

1.	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 2019-2021 Owner's Manual: Steering wheel

Electric power steering (EPS) The power steering uses an electric motor to assist you in steering the vehicle. If the engine is off or if the power steering system becomes inoperative, the vehicle may still be steered, but it will require increased steering effort. The electric power steering ...

Kia Optima DL3 2019-2021 Service and Repair Manual: Front Suspension System

Components and components location Components 1. Strut complete 2. Roll rod bracket 3. Sub frame 4. Stabilizer bar 5. Steering gear box 6. Dynamic damper 7. Sub frame stay ...