Mitsubishi Outlander GS45X. Manual — part 545

GENERAL INFORMATION

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-3

GENERAL INFORMATION

M1131000105999

.

The Multiport Fuel Injection System consists of sen-
sors which detect the engine conditions, the ENGINE
CONTROL MODULE (ECM) which controls the sys-
tem based on signals from these sensors, and actua-
tors which operate under the control of the ECM.
The ECM carries out activities such as fuel injection
control, idle air control, and ignition timing control.
In addition, the ECM is equipped with several diag-
nostic test modes which simplify troubleshooting
when a problem develops.

.

FUEL INJECTION CONTROL

The injector drive times and injection timing are con-
trolled so that the optimum air/fuel mixture is sup-
plied to the engine to correspond to the
continually-changing engine operation conditions.
A single injector is mounted at the intake port of each
cylinder. Fuel is sent under pressure from the fuel
tank to the fuel injectors by the fuel pump, with the
pressure being regulated by the fuel pressure regula-
tor. The regulated fuel is distributed to each of the
injectors.
Fuel injection is normally carried out once for each
cylinder for every two rotations of the crankshaft.
The firing order is 1-3-4-2. Each cylinder has a dedi-
cated fuel injector. This is called multiport.
The ECM provides a richer air/fuel mixture by carry-
ing out "open-loop" control when the engine is cold
or operating under high load conditions in order to
maintain engine performance.In addition, when the
engine is under normal operating temperature after
warming-up, the ECM controls the air/fuel mixture by
using the heated oxygen sensor signal or linear
air-fuel ratio sensor signal to carry out "closed-loop"
control. The closed-loop control achieves the theo-
retical air/fuel mixture ratio where the catalytic con-
verter can obtain the maximum cleaning
performance.

.

THROTTLE VALVE OPENING CONTROL

This system electrically controls the opening of the
throttle valve. The ECM detects the amount of travel
of the accelerator pedal via the accelerator pedal
position sensor, and controls the actuation of the
throttle actuator control motor, which is mounted on
the throttle body, in order to attain the target throttle
valve opening that has been predetermined in accor-
dance with driving conditions.

.

IDLE AIR CONTROL

The idle speed is kept at the optimum speed by con-
trolling the amount of air that passes through the
throttle valve in accordance with changes in idling
conditions and engine load during idling.
The ECM drives the throttle actuator control motor to
keep the engine running at the pre-set idle target
speed in accordance with the engine coolant temper-
ature and A/C and other electrical load. In addition,
when the air conditioning switch is turned off and on
while the engine is idling, the throttle actuator control
motor adjusts the throttle valve pass-through air
amount according to the engine load conditions to
avoid fluctuations in the engine speed.

.

IGNITION TIMING CONTROL

The ignition power transistor located in the ignition
primary circuit turns ON and OFF to control the pri-
mary current flow to the ignition coil. This controls the
ignition timing to provide the optimum ignition timing
with respect to the engine operating conditions. The
ignition timing is determined by the ECM from engine
speed, intake air volume, engine coolant tempera-
ture, and atmospheric pressure.

.

DIAGNOSTIC TEST MODE

• When a fault is detected in one of the sensors or

actuators related to emission control, the Mal-
function Indicator Lamp (SERVICE ENGINE
SOON or Check Engine Lamp) illuminates to
warn the driver.

• When a fault is detected in one of the sensors or

actuators, a diagnostic trouble code correspond-
ing to the fault is stored in the ECM.

• The RAM data inside the ECM that is related to

the sensors and actuators can be read with the
scan tool. In addition, the actuators can be con-
trolled by scan tool MB991958 (M.U.T.-III sub
assembly) under certain circumstances.

.

GENERAL INFORMATION

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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OTHER CONTROL FUNCTIONS

Fuel Pump Control

• Turns the fuel pump relay ON so that current is

supplied to the fuel pump while the engine is
cranking or running.

A/C Compressor Clutch Relay Control

• Turns the compressor clutch of the A/C ON and

OFF.

Engine Oil Control Valve Control

• The ECM carries out the duty control of the

engine oil control valve according to the opera-
tion condition. This varies the phase angle of the
camshaft to optimize the valve timing.

Generator Output Current Control

• Prevent generator output current from increasing

suddenly and idle speed from dropping at times
such as when the headlights are turned on.

Evaporative Emission Purge Control

• (Refer to GROUP 17, Emission Control System −

Evaporative Emission Control System

− General

Information

P.17-75

.)

EGR Control

• (Refer to GROUP 17, Emission Control System −

Exhaust Gas Recirculation (EGR) System - Gen-
eral Information

P.17-80

.)

GENERAL INFORMATION

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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MULTIPORT FUEL INJECTION (MFI) SYSTEM DIAGRAM

NOTE: For the vacuum routing, refer to GROUP 17, Emission Control

−

Vacuum Hoses

−

Vacuum Hose

Routing

P.17-68

.

AK901207

Fuel tank

Fuel level
sensor

Air
inlet

2 Exhaust engine
oil control valve

1 Intake engine
oil control valve

4 Manifold absolute pressure sensor

2 Intake air
temperature sensor

1 Mass airflow sensor

6 Intake
camshaft
position
sensor

7 Exhaust
camshaft
position
sensor

3 Throttle position
sensor (main/sub)

5 Evaporative emission
purge solenoid

3 Throttle actuator
control motor

12 Fuel tank differential
pressure sensor

13 Fuel tank
temperature
sensor

11 Heated oxygen sensor (rear)

10 Linear
air-fuel
ratio
sensor

8 Crankshaft position sensor

5 Engine
coolant
temperature
sensor

9 Knock sensor

4 Injector

Fuel pump

Fuel pressure
regulator

Evaporative
emission
canister

6 Evaporative
emission
ventilation
solenoid

7 EGR valve
(stepper motor)

1 Mass airflow sensor
2 Intake air temperature sensor
3 Throttle position sensor (main/sub)
4 Manifold absolute pressure sensor
5 Engine coolant temperature sensor
6 Intake camshaft position sensor
7 Exhaust camshaft position sensor
8 Crankshaft position sensor
9 Knock sensor
10 Linear air-fuel ratio sensor
11 Heated oxygen sensor (rear)
12 Fuel tank differential pressure sensor
13 Fuel tank temperature sensor

Ignition switch-IG
Ignition switch-ST
Power supply
CAN communication (input signal)

1 Intake engine oil control valve
2 Exhaust engine oil control valve
3 Throttle actuator control motor
4 Injector
5 Evaporative emission purge solenoid
6 Evaporative emission ventilation
solenoid
7 EGR valve (stepper motor)

Ignition coil, ignition power transistor
Multiport fuel injection (MFI) relay
Fuel pump relay
Starter relay
Throttle actuator control motor relay
Generator G terminal
Linear air-fuel ratio sensor heater
Heated oxygen sensor heater
A/C compressor clutch relay
CAN communication (output signal)

Sense

Act

Engine oil pressure switch
Power steering pressure switch
Generator FR terminal
Generator L terminal

Accelerator pedal position sensor (main/sub)

Battery current sensor
Battery temperature sensor

Decide

ECM
(with barometric
pressure sensor)

AC

GENERAL SPECIFICATIONS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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GENERAL SPECIFICATIONS

M1131000201820

ITEMS

SPECIFICATIONS

Throttle body

Throttle bore mm (in.)

57 (2.24)

Throttle position sensor

Hall element type

Throttle actuator control motor

DC motor type, having brushes

Engine control
module (ECM)

Identification model No.

E6T76678

Sensors

Mass airflow sensor

Heat sensitizing type

Barometric pressure sensor

Semiconductor diffused pressure type

Intake air temperature sensor

Thermistor type

Engine coolant temperature sensor

Thermistor type

Linear air-fuel ratio sensor

Zirconia type

Heated oxygen sensor

Zirconia type

Accelerator pedal position sensor

Hall element type

Intake camshaft position sensor

Magneto resistance element type

Exhaust camshaft position sensor

Magneto resistance element type

Crankshaft position sensor

Magneto resistance element type

Knock sensor

Piezoelectric element type

Power steering pressure switch

Contact switch type

Manifold absolute pressure sensor

Piezo resistive semiconductor type

Fuel tank differential pressure sensor

Piezo resistive semiconductor type

Fuel tank temperature sensor

Thermistor type

Actuators

Multiport fuel injection (MFI) relay

Contact switch type

Fuel pump relay

Contact switch type

Throttle actuator control motor relay

Contact switch type

Starter relay

Contact switch type

A/C compressor clutch relay

Contact switch type

Injector relay

Contact switch type

Injector type and number

Electromagnetic type, 4

Injector identification mark

JME290H

Intake engine oil control valve

Duty cycle type solenoid valve

Exhaust engine oil control valve

Duty cycle type solenoid valve

EGR valve

Stepper motor type

Evaporative emission purge solenoid

Duty cycle type solenoid valve

Evaporative emission ventilation solenoid

ON/OFF type solenoid valve