Kia Optima: Engine Control System / Variable Charge Motion Actuator (VCMA)
Description and operation
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The Variable Charge Motion Actuator (VCMA) is installed on the inlet
of the intake manifold.
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It consists of a DC motor which actuates the VCM valve and a position
sensor which detects the position of the VCM valve.
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The VCM system tumbles air flow entering into combustion chamber of each
cylinder by closing the VCM valve in the cold start conditions.
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This tumble effect reduces cold start emissions by improving atomization
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Components and components location
1. Variable Charge Motion Actuator
(VCMA)
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Schematic diagrams
Harness Connector
Repair procedures
| 1. |
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)
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| (2) |
Sensor data : Checks the system input/output value status
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| (3) |
Forced operation : Checks the system operating status
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| (4) |
Additional function : Controls system options, zero point adjustment
and other functions
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| 1. |
Disconnect the negative battery terminal.
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| 2. |
Disconnect the PCV hose (A).
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| 3. |
Disconnect the VCMA connector (A).
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| 4. |
Remove the VCMA mounting bolts (B).
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Tightening torque :
9.8 - 11.8 N·m (1.0 - 1.2 kgf·m, 7.2 - 8.7 lb·ft)
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| 5. |
Remove the VCMA (A).
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Install the component with the specified torque.
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Note that internal damage may occur when the component is dropped.
In this case, use it after inspecting.
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The VCM actuator has to be installed at the fully closing positon
of the VCM valve.
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If it doesn't, the VCM coupling of the VCM shaft can't be put
in the VCM actuator.
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| 1. |
Install in the reverse order of removal.
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Specifications
Specification
Item
Specification
Coil resistance (Ω)
30.0 - 35.0 [22°C (71.6°F)]
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