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)]
Description and op ...
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:
Description and operation
Description
Automatic transaxle control system relies on various measurements to determine
the current control status and determine the necessary compensation values. These
values are used to control the actuators and achieve the desired control output.
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Components and components location
Component Location
1. Outside rear view mirror
Repair procedures
Replacement
Put on gloves to prevent hand injuries.
...
Variable Intake Solenoid (VIS) Valve
Fuel Delivery System