( TL19E20A14680300000CAAT10 )

Operation
At engine start, and high load

- The rocker arm oil control valve is OFF.
- Oil pressure then enters secondary rocker arm B from the oil passage in the intake rocker shaft.
  This forces the VTEC switching piston into secondary rocker arm A against the return spring and disengages secondary arm A from secondary arm B to stop valve actuation.

At cruise
The rocker arm oil control valve switches oil pressure to the oil passage in the intake rocker arm shaft. Oil pressure then enters secondary rocker arm A, and it moves the VTEC switching piston in the rocker arm.
This causes the VTEC switching piston to slide into secondary rocker arm B, locking secondary rocker arms A and B together.