System Description: VTEC
- This system improves fuel efficiency and reduces exhaust emissions at all levels of engine speed, vehicle speed, and engine load.
- 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 valve pause cam (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 switches both intake rocker arms of the VTEC system on and off; the solenoid is controlled by the ECM/PCM.
- The rocker arm oil pressure switch detects VTEC system oil pressure and sends this information to the ECM/PCM.ROCKER ARM OIL CONTROL SOLENOID REFERENCE
ENGINE SPEED ROCKER ARM OIL CONTROL SOLENOID ROCKER ARM OIL PRESSURE SWITCH INTAKE VALVE LIFT LOW OFF ON PAUSE (LOW) HIGH ON OFF HIGH