Intake valve side (All models)

The VTEC system changes the cam profile to correspond to engine speed. It maximizes torque at low engine speed and output at high engine speed.
The low lift cam is used at low engine speeds, and the high lift cam is used at high engine speeds.
The rocker arm oil control solenoid (rocker arm oil control solenoid A) switches the intake valve side of the VTEC system on and off; the solenoid is controlled by the ECM/PCM.
The rocker arm oil. pressure switch (rocker arm oil pressure switch A) detects VTEC system oil pressure (intake valve side) and sends this information to the ECM/PCM.