Operation CHARM: Car repair manuals for everyone.

OCV (Oil Control Valve)

OCV (Oil Control Valve)




ECM controls the position of a spool valve by the duty signal from ECM, and is adjusting the oil supply to advance and retard of VVT.

(A) Advance (Initial Position)




The spool valve moves to right-hand side, the vane pump rotates to advance side.

(B) Retard




The spool valve of OCV moves to left-hand side, the vane pump rotates to retard side.