Mitsubishi Evolution X. Manual — part 125

ACTUATOR

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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

ACTUATOR

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MULTIPORT FUEL SYSTEM (MFI)

13A-30

EVAPORATIVE EMISSION VENTILATION
SOLENOID

The evaporative emission ventilation solenoid, an ON/OFF
type solenoid valve, is integrated in the evaporative canis-
ter.The evaporative emission ventilation solenoid is installed
between the evaporative canister and the air-releasing end,
where the evaporative emission ventilation solenoid takes or
shuts off air.When the current is not flowing through the coil, the
air flows between the nipples, "A" and "B", and through the
evaporative canister.When the current is flowing through the
coil, the air is sealed in the nipple "A" and the air through the
evaporative canister is shut off. When monitoring the evapora-
tive leak, the ECM turns the evaporative emission ventilation
solenoid ON to create the slight vacuum condition in the evapo-
rative emission control system. The ECM shuts off the air flow-
ing through the evaporative canister to maintain the vacuum
condition necessary for monitoring.

AK604127 AC

To canister

Connector

Evaporative
emission
ventilation
solenoid

To filter

A

B

AK604554

12

0

AB

OFF

ON

ECM

ECM terminal voltage V

Engine speed r/min

From MFI relay

Evaporative emission
ventilation solenoid

Engine speed to switch
evaporative emission
ventilation solenoid

ACTUATOR

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MULTIPORT FUEL SYSTEM (MFI)

13A-31

GENERATOR G TERMINAL

ECM uses ON/OFF of generator G terminal to control genera-
tor output voltage. When the power transistor in the ECM turns
ON, output voltage gets adjusted to about 12.8 V. When gener-
ator output voltage drops to 12.8 V it becomes lower than volt-
age of the charged battery and almost no current is output from
the generator. When the power transistor in the ECM turns
OFF, output voltage gets adjusted to about 14.4 V. When gen-
erator output voltage is about 14.4 V, generator outputs current
to produce electricity. In case electric load is generated sud-
denly, ECM controls generator G terminal's On-duty to limit the
sudden increase in generator load due to generation and thus
prevents change in idle speed.

AK702856AD

Field coil

IC regulator

Generator

G

Ignition switch-IG

Battery

B

S

ECM

FUEL INJECTION CONTROL

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MULTIPORT FUEL SYSTEM (MFI)

13A-32

FUEL INJECTION CONTROL

M2132003001285

Fuel injection volume is regulated to obtain the opti-
mum air-fuel ratio in accordance with the constant
minute changes in engine driving conditions. Fuel
injection volume is controlled by injector drive time
(injection time). There is a prescribed basic drive
time that varies according to the engine speed and

intake air volume. ECM adds prescribed compensa-
tions to this basic drive time according to conditions
such as the intake air temperature and engine cool-
ant temperature to decide injection time. Fuel injec-
tion is done separately for each cylinder and is done
once in two engine rotations.

System Configuration Diagram

AK704139AB

Injector

From fuel
pump

ECM

To fuel tank

Fuel pressure
regulator

Mass airflow sensor

Intake air temperature sensor 1

Manifold absolute pressure sensor

Intake air temperature sensor 2

Barometric pressure sensor

Engine coolant temperature sensor

Accelerator pedal position sensor

Knock sensor

Intake camshaft position sensor

Crankshaft position sensor

Ignition switch-ST

Heated oxygen sensor (front, rear)