VTEC System Description - Control (A/T, M/T, except K24Z7)

Based on the vehicle speed signal, engine speed signal, engine load signal, throttle position signal, and engine coolant temperature signal sent from various sensors, the engine control module (ECM)/powertrain control module (PCM) controls the ON/OFF of the rocker arm oil control solenoid.

Courtesy of HONDA, U.S.A., INC.