The Vtec solenoid is a solenoid that is controlled by the ECU.  When a +12v signal is applied to it, it opens allowing oil pressure to switch from the Low Cam to the High Cam.
-  Illustration of VTEC solenoid's role.: 
 
     
 
 
 |  Attachment?:  |  Modify:  |  Size:  |  Date:  |  Who:  |  Comment:  |  
    vtecsol.GIF      |   mod      |   22748   |   30 Mar 2004 - 08:02   |   tekphobia   |   Illustration of VTEC solenoid's role.   |  
 
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