Phase Angle Advances

In response to an advance signal from the ECM, the oil flow control solenoid valve moves its spool such that hydraulic pressure is applied to the advance chamber in the camshaft sprocket. The sprocket is then turned in the direction in which its phase angle advances relative to the camshaft.

Fig 1: Identifying Variable Valve Timing Controller, Vane, ECM And Oil Flow Control Solenoid Valve (Phase Angle Advances)

Courtesy of SUBARU OF AMERICA, INC.