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

Components and components location

ECM directly controls the actuator and the rotation of motor operates the VCM flap of intake manifold in link structure to create tumble in air. Mounted inside the actuator, the motor and position sensor sense the position of flap and send feedback to ECM to determine the current location of flap and detect abnormal operation due to adherence of foreign substance.

Description and operation

Variable charge motion actuator reinforces the tumble of the air that flows inside the cylinder, improves combustion performance, and enhances engine torque and fuel efficiency in low to mid speed range. ECM drives ON/OFF the motor to control the VCMA. VCMA is usually "Closed" and creates tumble for the air intake when vehicle is started. When vehicle accelerates and reaches approx. 2,600 rpm, actuator operates VCM flap (Open) and facilitates the flow of air intake.

Schematic diagrams

Harness Connector

Repair procedures

1.	Install in the reverse order of removal. VCMA mounting bolt : 9.8 - 11.8 N·m (1.0 - 1.2 kgf·m, 7.2 - 8.7 lb·ft) Make sure that groove part of the connection link is pointing upward when mounting VCMA.

After replacing the VCMA (Variable Charge Motion Actuator) or intake manifold, be sure to delete the previous VCMA adative value by performing the 'resetting adaptive values' procedure using KDS.

VCMA learning procedure is performed automatically while driving but manual learning procedure is also available for immediate access to proper operation. 1) Push the accelerator pedal at 2,500 engine rpm for 2-3 seconds and then idle the engine. 2) Repeat the no. 1 procedure three times. 3) Switch "OFF" the ignition.