Mitsubishi Outlander XL. Manual — part 1248

While starting

ECM adds various compensations to the target
opening angle that are set based on the engine
coolant temperature, so that the air volume is
optimum for starting.

While idling

ECM controls the throttle valve to achieve the target
opening angle that are set based on the engine

coolant temperature. In this way best idle operation is
achieved when engine is cold and when it is hot. Also,
the following compensations ensure optimum control.

While driving

Compensations are made to the target opening angle
set according to the accelerator pedal opening angle
and engine speed to control the throttle valve opening
angle.

List of main compensations for throttle valve opening angle and idle speed control

Compensations

Content

Stable idle compensation (immediately after start)

In order to stabilize idle speed immediately after
start, target opening angle is kept big and then
gradually reduced. Compensation values are set
based on the engine coolant temperature.

Rotation speed feedback compensation (while
idling)

In case there is a difference between the target idle
speed and actual engine speed, ECM compensates
the throttle valve opening angle based on that
difference.

Atmospheric pressure compensation

At high altitudes atmospheric pressure is less and
the intake air density is low. So, the target opening
angle is compensated based on atmospheric
pressure.

Engine coolant temperature compensation

Compensation is made according to the engine
coolant temperature. The lower the engine coolant
temperature the greater the throttle valve opening
angle.

Electric load compensation

Throttle opening angle is compensated according to
electric load. The greater the electric load, the
greater the throttle valve opening angle.

Compensation when shift is in D range

When transmission is changed from P or N range to
some other range, throttle valve opening angle is
increased to prevent reduction in engine speed.

Compensation when A/C is functioning

Throttle opening angle is compensated according to
functioning of A/C compressor. While A/C
compressor is being driven, the throttle valve
opening angle is increased.

Power steering fluid pressure compensation

Throttle opening angle is compensated according to
power steering fluid pressure. The higher the power
steering fluid pressure the greater the throttle valve
opening angle.

Initialize control

After ignition switch turns OFF, ECM drives the throttle
valve from fully closed position to fully open position
and records the fully closed/open studied value of the

throttle position sensor (main and sub) output signals.
The recorded studied values are used as studied
value compensation for compensating basic target
opening angle when the engine is started next.

13A-40

MULTIPORT FUEL SYSTEM (MFI)

MIVEC (Mitsubishi Innovative Valve Electronic Control System)

MIVEC (Mitsubishi Innovative Valve Electronic Control System)

M21302000235USA0000010000

ECM turns the engine oil control valve ON/OFF
according to engine speed in order to control oil

pressure acting on the piston in the rocker arm. Thus,
change is done between low-speed cam and high-
speed cam.

System Configuration Diagram

ZK600294

MFI relay

Engine oil control valve

Battery

Engine coolant temperature sensor

Crankshaft position sensor

ECM

From oil pump

To oil pan

To piston

AA01

Engine oil pressure switch
(for MIVEC)

ECM turns OFF (Duty: 0 %) the engine oil control
valve at low engine speed (4,750 r/min or less). As a
result, oil pressure does not act on the piston in the
rocker arm and inlet valve is driven by the low speed
cam. ECM turns ON (Duty: For 2 seconds after
change 100 %; after 2 seconds 60 %) the engine oil
control valve at high engine speed (4,750 r/min or

more). As a result, oil pressure acts on the piston in
the rocker arm and inlet valve is driven by the high
speed cam. It will be continually driven by the low
speed cam under following conditions.

｠

Engine coolant temperature is less than 20°C(68°
F).

｠

For 10 seconds after engine is fully started.

MULTIPORT FUEL SYSTEM (MFI)

13A-41

MIVEC (Mitsubishi Innovative Valve Electronic Control System)

ZK602518

Low lift

Exhaust

Intake

Cam lift

amount

Camshaft
operation angle

Overlap:
small

High lift

Shaft torque

Engine speed r/min

4,750

AA00

High-speed mode

Low-speed mode

Cam lift

amount

Exhaust

Intake

Camshaft operation
angle

Overlap:
large

Driving condition

Valve timing

Action

Benefit

Low engine speed

ZK602519

TDC

Intake valve

Exhaust valve

BDC

Close

AA00

Valve opening time is
shortened to limit spit back
volume by intake air.

Improvement of low
speed torque

13A-42

MULTIPORT FUEL SYSTEM (MFI)

MIVEC (Mitsubishi Innovative Valve Electronic Control System)

Driving condition

Valve timing

Action

Benefit

High engine speed

ZK602520

Intake valve

Exhaust valve

Close

TDC

BDC

AA00

Valve opening time is
increased to increase input
air volume.

Improve output power

VARIABLE INDUCTION CONTROL

M21302000170USA0000010000

Based on engine speed, ECM turns ON/OFF the
intake manifold tuning solenoid to control intake

manifold negative pressure that acts on the vacuum
actuator. As a result, the control valve in the
secondary port is opened / closed.

System Configuration Diagram

ZK600298

Crankshaft position
sensor

AA01

ECM

MFI relay

Vacuum tank

Primary port

Vacuum actuator

Secondary port

Control valve

Intake manifold
tuning solenoid

Battery

When engine is at low or middle speed (3,600 r/min
or less) ECM turns ON the intake manifold tuning
solenoid. As a result, intake manifold negative
pressure acts on vacuum actuator and control valve

is closed. When engine is at high speed (3,600 r/min
or more) ECM turns OFF the intake manifold tuning
solenoid. As a result, the inside of the vacuum
actuator comes to atmospheric pressure and the
control valve opens.

MULTIPORT FUEL SYSTEM (MFI)

13A-43

VARIABLE INDUCTION CONTROL