General Information

P200A Intake Manifold Runner Performance

General Information

Component Location





General Description

The Variable Charge Motion Actuator (VCMA) is used to adjust a valve (flap) in the intake runner for each cylinder. The valve does not close off the runner but restricts it in such a way to cause turbulence (swirl) in the air fuel mixture. The turbulence in the air will reduce emissions under cold start condition. The valve is operated by a worm gear type driver which doesn't open for limp home mode in the case of loss of current supply. (It doesn't have a return spring.) The system also has a Valve Position Sensor (VPS) to supply a feedback of the valve position to the PCM.

DTC Description

PCM will set a failure P200A DTC when
1. The difference between commanded valve position and actual valve position is greater than 50%.
2. If initial position learning value of VCMA is out of specified range by carbon or foreign object in intake manifold.

DTC Detecting Condition





Diagnostic Circuit Diagram





Signal Waveform & Data








Fig 1) Normal waveform of VCM actuator (OPEN)
Fig 2) Normal waveform of VCM actuator (Closed)