Mitsubishi Evolution X. Manual - part 125
ACTUATOR
TSB Revision
MULTIPORT FUEL SYSTEM (MFI)
13A-29
EXHAUST ENGINE OIL CONTROL VALVE
The exhaust engine oil control valve is installed on the exhaust
side of the cylinder head. Receiving the duty signal from the
ECM, the exhaust engine oil control valve moves the spool
valve position and divides the oil pressure from the cylinder
block into the advanced chamber and the retarded chamber of
the V.V.T. sprocket as well as continually changes the exhaust
camshaft phase. The spring makes spool valve stop at the
position where the exhaust camshaft is at the most advanced
angle when the engine is stopped. The ECM moves the spool
valve position by increasing and decreasing ON duty ratio of
the exhaust engine oil control valve and allows the exhaust
camshaft to be at the target phase angle. When the duty ratio
increases, the spool valve moves. The sprocket rotates toward
the retarded angle side. When the duty ratio decreases, the
sprocket rotates toward the advanced angle side. When the
medium duty ratio, at which the spool valve is at the medium
position, is achieved, all the oil passages are closed. This
allows the phase angle to be kept constant. The ECM changes
and controls the duty ratio in accordance with the engine oper-
ation to get the optimum phase angle.
AK604747
Spool valve movement
Retard
chamber
Spring
Drain
Oil pressure
Coil
Plunger
Drain
Advance
chamber
AC
AK700722 AD
ECM
Exhaust engine
oil control valve
From MFI relay