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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)