Variable Valve Timing System - Subaru impreza 2002 Service Manual

B: PHASE ANGLE RETARDS
In response to a retard signal from the ECM, the oil flow control valve moves its spool such that
hydraulic pressure is applied to the retard chamber in the camshaft sprocket. The sprocket is then
turned in the direction in which its phase angle retards relative to the camshaft.
(1) Variable valve timing controller (attached to camshaft sprocket)
(2) Vane (attached to intake camshaft)
(3) ECM
(4) Oil flow control valve
(5) Hydraulic pressure
(6) Turns in retard direction

VARIABLE VALVE TIMING SYSTEM

ME-7
Mechanical
NF0582