Mitsubishi Outlander (2013+). Manual - part 137

THROTTLE VALVE OPENING ANGLE CONTROL AND IDLE SPEED CONTROL

MULTIPOINT FUEL INJECTION (MPI)

13A-32

[Control for checking ignition timing]

During basic ignition timing set mode for M.U.T.-III 
actuator test function, sparking is done with fixed 
ignition timing (5

° BTDC) synchronized with crank-

shaft position sensor signal.

THROTTLE VALVE OPENING ANGLE CONTROL AND IDLE 

SPEED CONTROL

M2132003501053

Engine-ECU detects the amount of accelerator pedal 
depression (as per operator's intention) through the 
accelerator pedal position sensor. Based on pre-set 
basic target opening angles it adds various compen-
sations and controls the throttle valve opening angle 
according to the target opening angle.

While starting

Engine-ECU adds various compensations to the tar-
get opening angle that are set based on the engine 
coolant temperature, so that the air volume is opti-

mum for starting.

Battery voltage compensation

Compensation is made depending on battery 
voltage. The lower the battery voltage the greater 
the current carrying time and when battery voltage 
is high current carrying time is shortened.

Compensations

Content

AK602236AQ

Throttle
position
sensor

Main

Main

Sub

Sub

Motor drive circuit

A/C switch (CAN)

A/C load signal (CAN)

Engine coolant
temperature sensor

Intake air temperature
sensor

Crank angle sensor

Alternator FR terminal

Inhibitor switch (CAN)

Motor drive power source
(From throttle valve control
servo relay)

Throttle valve
control servo

Control unit

Barometric pressure
sensor

Accelerator
pedal position
sensor

E

ngine-ECU

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THROTTLE VALVE OPENING ANGLE CONTROL AND IDLE SPEED CONTROL

MULTIPOINT FUEL INJECTION (MPI)

13A-33

While idling

Engine-ECU 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

Initialize control

After ignition switch turns OFF, engine-ECU drives 
the throttle valve from fully closed position to fully 
open position and records the fully closed/open stud-
ied value of the throttle position sensor (main and 
sub) output signals. The recorded studied values are 
used as studied value compensation for compensat-
ing basic target opening angle when the engine is 
started next.

Engine protection control

When the racing is continued during the vehicle 
stopped period (no-load period) for more than the 
specified time, the engine-ECU closes the throttle 
valve and restricts the engine speed to protect the 
engine.

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, engine-ECU 
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.

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MIVEC (Mitsubishi Innovative Valve Timing Electronic Control System)

MULTIPOINT FUEL INJECTION (MPI)

13A-34

MIVEC (Mitsubishi Innovative Valve Timing Electronic 

Control System)

M2132023500911

The MIVEC system effects a continuously variable 
control on the inlet valve timing. The valve operating 
angle is not change. MIVEC enables valve timing 
control that is optimal for the operating conditions of 
the engine. Thus, it stabilizes the idle and improves 
power output and torque in all driving ranges.

System Configuration Diagram

• The engine-ECU assesses the driving conditions 

of the engine by way of the signals input by sen-
sors.

• Based on the assessed information, the 

engine-ECU outputs duty cycle signals to the inlet 
oil feeder control valve in order to control the 
position of the spool valve.

• By varying the position of the spool valve, the oil 

pressure can be applied either to the retard or 
advance chamber, thus continuously changing 
the phases of the inlet camshaft.

AKB00755

Inlet camshaft position
sensor

Engine-ECU

Spool valve

To oil pan

To oil pan

Oil pressure

Advance direction

Spool valve movement

Retard direction

Retard chamber

Advance chamber

Spring

Inlet oil feeder
control valve

Crankshaft position sensor

Air flow sensor

Throttle position sensor

Engine coolant temperature
sensor

AB

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MIVEC (Mitsubishi Innovative Valve Timing Electronic Control System)

MULTIPOINT FUEL INJECTION (MPI)

13A-35

The engine-ECU calculates the detected phase 
angle by using the signal from the inlet camshaft 
position sensor and the crank angle sensor.

Operation Conceptual Diagram

The engine-ECU controls the camshaft phase angle 
in order to attain optimal valve timing that suits the 
engine load and engine speed.

AKB00756AB

: Phase angle

<No.2TDC>

H

L

H

L

<No.1TDC>

<No.3TDC>

<No.4TDC>

<No.2TDC>

Crank angle
sensor signal

Inlet camshaft
position sensor
signal

AK800138

Valve lift

Exhaust valve lift curve

At most
advanced angle

Inlet valve lift curve
(at most retarded angle)

Inlet camshaft
phase angle

AB

Overlap

Initial Phase

Control Direction

Inlet valve

Most retarded angle

Advance direction

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