Mitsubishi Galant (2004+). Manual - part 1743

13B-1

GROUP 13B

MULTIPORT FUEL 

SYSTEM (MFI) 

<3.8L ENGINE>

CONTENTS

GENERAL DESCRIPTION. . . . . . . . .

13B-2

FUEL INJECTION CONTROL . . . . . .

13B-5

THROTTLE VALVE OPENING ANGLE 
CONTROL  . . . . . . . . . . . . . . . . . . . . .

13B-6

IGNITION TIMING CONTROL . . . . . .

13B-7

FAN CONTROL 
(RADIATOR, A/C CONDENSOR). . . .

13B-8

OTHER CONTROL FUNCTIONS . . . .

13B-9

ON-BOARD DIAGNOSTIC . . . . . . . . .

13B-9

GENERAL DESCRIPTION

MULTIPORT FUEL SYSTEM (MFI) <3.8L ENGINE>

13B-2

GENERAL DESCRIPTION

M2132000100376

The basic design is the same as that for the 3.8 L 
engine installed in the ENDEAVOR except that the 
following modifications have been incorporated:

IMPROVEMENT / ADDITION

REMARK

A pulsation damper is discontinued.

System is simplified.

The fan control is changed.

The fan controller is abolished. The both of 
high and low relays control the fan motor.

GENERAL DESCRIPTION

MULTIPORT FUEL SYSTEM (MFI) <3.8L ENGINE>

13B-3

SYSTEM BLOCK DAIGRAM

[1] Fuel injection control

[3] Ignition timing control

[4] Power supply control
     (Power supply to sensor, 
      actuator)

[5] Fuel pump control

[6] Heated oxygen sensor heater
     control

[7] A/C compressor clutch relay
     control

[9] EVAP emission control

[8] Fan motor control
     (Radiator, A/C condensor)

[10] EGR control

[13] Generator control

[11] Diagnostic output

[12] RAM data transmission

· Throttle opening feedback control

*: Indicates power that is input into throttle valve control unit, sensor, and actuator that is controlled by throttle valve control unit.

[2] Throttle valve opening control
     and idle speed control

ACTUATOR

SENSOR, SWITCH

POWERTRAIN CONTROL MODULE (PCM) 

Powertrain control module

Barometric pressure sensor

Throttle valve control unit

No.5 Ignition coil

Throttle actuator control motor
(DC motor)*

Throttle actuator contorol motor
power*

Throttle position sensor (Main)*

Accelerator pedal position 
sensor (Sub)*

AK304202

Mass airflow sensor

Engine coolant temperature
sensor

Accelerator pedal position 
sensor (Main)

Throttle position sensor (Sub)

Crankshaft position sensor

Knock sensor

Camshaft position sensor

Heated oxygen sensor

Power steering pressure switch

Transmission range switch

Fuel tank differential pressure
sensor

Fuel tank temperature sensor

Fuel level sensor

MAP sensor

Ignition switch-IG

Ignition switch-ST

Power supply

Generator FR terminal

Intake air temperature sensor

No.1 injector

No.2 injector

No.3 injector

No.4 injector

No.5 injector

No.6 injector

No.1 Ignition coil

No.2 Ignition coil

No.3 Ignition coil

No.4 Ignition coil

No.6 Ignition coil

MFI relay

Fuel pump relay

Heated oxygen sensor heater

EVAP purge solenoid

EVAP ventilation solenoid

EGR valve (Stepper motor)

Diagnostic output terminal

Generator G terminal

Throttle actuator control motor
relay

A/C compressor clutch relay

Fan control relay
(Radiator, A/C condensor)

GENERAL DESCRIPTION

MULTIPORT FUEL SYSTEM (MFI) <3.8L ENGINE>

13B-4

CONTROL SYSTEM DAIAGRAM

AK301872

MANIFOLD
ABSOLUTE
PRESSURE
SENSOR

THROTTLE
ACTUATOR
CONTROL
MOTOR

CAMSHAFT
POSITION
SENSOR

LEFT BANK HEATED OXYGEN 
SENSOR (FRONT)

FUEL TANK
DIFFERENTIAL
PRESSURE
SENSOR

FUEL TANK
TEMPERATURE
SENSOR

EVAPORATIVE EMISSION
VENTILATION VALVE

FUEL TANK

EVAPORATIVE 
EMISSION 
CANISTER

    3  THROTTLE POSITION SENSOR
       (MAIN/SUB)

MASS AIRFLOW 
SENSOR

ENGINE
COOLANT
TEMPERATURE
SENSOR

IGHTBANK
EATED
XYGEN 

ENSOR

FRONT)

RIGHT BANK HEATED
OXYGEN SENSOR (REAR)

FUEL PRESSURE
REGULATOR

EVAPORATIVE 
EMISSION
VENTILATION 
SOLENOID

LEFT BANK HEATED OXYGEN
SENSOR (REAR)

FUEL PUMP

CRANKSHAFT POSITION
SENSOR

FUEL
LEVEL
SENSOR

AIR
INLET

INTAKE AIR TEMPERATURE
SENSOR

EVAPORATIVE
EMISSION
PURGE SOLENOID

INJECTOR

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   CAMSHAFT POSITION SENSOR
7   CRANKSHAFT POSITION SENSOR
8   RIGHT BANK HEATED OXYGEN SENSOR (FRONT)
9   RIGHT BANK HEATED OXYGEN SENSOR (REAR)
10 LEFT BANK HEATED OXYGEN SENSOR (FRONT)  
11 LEFT BANK HEATED OXYGEN SENSOR (REAR)
12 FUEL TANK DIFFERENTIAL PRESSURE SENSOR
13 FUEL TANK TEMPERATURE SENSOR
14 FUEL LEVEL SENSOR
 
     ACCELERATOR PEDAL POSITION SENSOR 
     (MAIN/SUB)
     KNOCK SENSOR
     POWER STEERING PRESSURE SWITCH
     OUTPUT SHAFT SPEED SENSOR
     TRANSMISSION RANGE SWITCH
     GENERATOR FR TERMINAL
     IGNITION SWITCH - IG
     IGNITION SWITCH - ST
     POWER SUPPLY     

1   THROTTLE ACTUATOR
     CONTROL MOTOR
2   EGR VALVE (STEPPER
     MOTOR)
3   INJECTOR
4   EVAPORATIVE EMISSION 
     PURGE SOLENOID
5   EVAPORATIVE EMISSION 
     VENTILATION SOLENOID
   

     IGNITION COIL, IGNITION
     POWER TRANSISTER
     MULTIPORT FUEL 
     INJECTION (MFI) RELAY
     FUEL PUMP RELAY
     THROTTLE ACTUATOR 
     CONTROL MOTOR RELAY
     GENERATOR G TERMINAL
     HEATED OXYGEN SENSOR
     HEATER
     FAN CONTROL RELAY
     (RADIATOR, A/C CONDENSER)
     A/C COMPRESSOR CLUTCH 
     RELAY
     DIAGNOSTIC OUTPUT

PCM  (WITH
BAROMETRIC
PRESSURE
SENSOR)

SENSE

DECIDE

ACT

AB