System Description: VTEC: Notes
WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.
The VTEC system changes intake and exhaust valve lift characteristics (in normal lift and pause modes) to improve fuel economy. Two rocker arm oil control solenoids in the engine oil passage that leads to the intake and exhaust rocker arms controls the intake and the exhaust valve lift. The engine oil pressure is monitored by two rocker arm oil pressure sensors.