Mitsubishi Galant (2004+). Manual - part 1740

GENERAL DESCRIPTION

MULTIPORT FUEL SYSTEM (MFI) <2.4L ENGINE>

13A-3

SYSTEM BLOCK DIAGRAM

[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

[8] A/C compressor clutch relay
     control

[10] EVAP emission control

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

[11] EGR control

[14] Generator control

[12] Diagnostic output

[13] 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

Throttle actuator control motor
(DC motor)*

AK302226

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

Fuel tank differential pressure
sensor

Fuel tank temperature sensor

Fuel level sensor

Manifold absolute
pressure sensor

Ignition switch-IG

Ignition switch-ST

Power supply

Generator FR terminal

Intake air temperature sensor

Accelerator pedal position 
sensor (Sub)*

Throttle position sensor (Main)*

Throttle actuator control motor
power*

No.1 injector

No.2 injector

No.3 injector

No.4 injector

No.1 Ignition coil

No.2 Ignition coil

No.3 Ignition coil

No.4 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

Engine oil pressure switch

[7] Valve timing and lift switching
     control

Fan control relay
(Radiator, A/C condenaer)

A/C compressor clutch relay

Engine oil control valve
(for valve timing and lift
 switching control)

Transmission range switch

GENERAL DESCRIPTION

MULTIPORT FUEL SYSTEM (MFI) <2.4L ENGINE>

13A-4

CONTROL SYSTEM DIAGRAM

AK302227

1   MASS AIRFLOW SENSOR
2   INTAKE AIR TEMPERATURE SENSOR
3   THROTTLE POSITION SENSOR (MAIN/SUB)
4   MANIFOLD ABSOLUTE PRESSURE SENSOR
5   CAMSHAFT POSITION SENSOR
6   ENGINE COOLANT TEMPERATURE SENSOR
7   KNOCK SENSOR
8   CRANKSHAFT POSITION SENSOR
9   CYLINDER 1, 4 HEATED OXYGEN SENSOR
     (FRONT)
10 CYLINDER 2, 3 HEATED OXYGEN SENSOR
     (FRONT)
11 CYLINDER 1, 4 HEATED OXYGEN SENSOR
     (REAR)
12 CYLINDER 2, 3 HEATED OXYGEN SENSOR 
     (REAR)
13 FUEL TANK DIFFERENTIAL PRESSURE SENSOR
14 FUEL TANK TEMPERATURE SENSOR
15 FUEL LEVEL SENSOR
 
     ACCELERATOR PEDAL POSITION SENSOR 
     (MAIN/SUB)
     POWER STEERING PRESSURE SWITCH
     ENGINE OIL 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   INJECTOR
3   ENGINE OIL CONTROL VALVE
4   EGR  VALVE
     (STEPPER MOTOR)
5   EVAPORATIVE EMISSION 
     PURGE SOLENOID
6   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

   1 MASS AIRFLOW 

SENSOR

AIR
INLET

   2 INTAKE AIR TEMPERATURE

SENSOR

THROTTLE
ACTUATOR
CONTROL
MOTOR

     1

   3  THROTTLE POSITION SENSOR
       (MAIN/SUB)

MANIFOLD
ABSOLUTE
PRESSURE
SENSOR

   4

ENGINE 
COOLANT
TEMPERATURE SENSOR

    6

    2 INJECTOR

    8 CRANKSHAFT POSITION

SENSOR

  

10CYLINDER 2, 3

HEATED OXYGEN 
SENSOR (FRONT)

   5 CAMSHAFT

POSITION
SENSOR

    4 EGR VALVE

(STEPPER MOTOR)

    5 EVAPORATIVE

EMISSION
PURGE SOLENOID

     6 EVAPORATIVE 

EMISSION
VENTILATION 
SOLENOID

EVAPORATIVE EMISSION
VENTILATION VALVE

   13 FUEL TANK

DIFFERENTIAL
PRESSURE
SENSOR

   14 FUEL TANK

TEMPERATUR
SENSOR

FUEL TANK

EVAPORATIVE 
EMISSION 
CANISTER

FUEL PUMP

   15 FUEL

LEVEL
SENSOR

    3 ENGINE OIL

CONTROL
VALVE

KNOCK
SENSOR

   7

FUEL PRESSURE
REGULATOR

   9 CYLINDER 1, 4 

HEATED OXYGEN 
SENSOR (FRONT)

11 CYLINDER 1, 4

HEATED OXYGEN 
SENSOR (REAR)

12 CYLINDER 2, 3

HEATED OXYGEN 
SENSOR (REAR)

SENSOR

MULTIPORT FUEL SYSTEM (MFI) <2.4L ENGINE>

13A-5

SENSOR

M2132001000178

ACCELERATOR PEDAL POSITION SENSOR

The accelerator pedal position sensor detects the amount of 
travel of the accelerator pedal. Mounted on the accelerator 
pedal arm, this sensor outputs a voltage signal, which corre-
sponds to the amount of pedal travel, to the powertrain control 
module (PCM). Through this signal, the PCM determines the 
target opening of the throttle valve. This accelerator pedal posi-
tion sensor uses a non-contact Hall IC to enhance its reliability. 
The construction and operation of this sensor are basically the 
same as ENDEAVOR.

FUEL INJECTION CONTROL

M2132003000271

The fuel injection control is basically the same as 
that for the 2.4L engine installed in the LANCER 
WAGON.

.

System Configuration Diagram

AK203447

SENSOR 
VOLTAGE (MAIN)

SENSOR 
OUTPUT (MAIN)

SENSOR 
EARTH (MAIN)

SENSOR 
OUTPUT (SUB)

SENSOR 
VOLTAGE(SUB)

SENSOR 
EARTH (SUB)

ACCELERATOR 
PEDAL POSITION 
SENSOR

ACCELERATOR PEDAL ARM

AB

AK302228

FROM
FUEL
PUMP

INJECTOR

PCM

MASS AIRFLOW SENSOR

BAROMETRIC PRESSURE SENSOR

INTAKE AIR TEMPERATURE SENSOR

ENGINE COOLANT TEMPERATURE
SENSOR

THROTTLE POSITION SENSOR

CRANKSHAFT POSITION SENSOR

CAMSHAFT POSITION SENSOR

KNOCK SENSOR

OUTPUT SHAFT SPEED SENSOR

IGNITION SWITCH-ST

HEATED OXYGEN SENSOR

AB

MANIFOLD ABSOLUTE PRESSURE
SENSOR

THROTTLE VALVE OPENING ANGLE CONTROL

MULTIPORT FUEL SYSTEM (MFI) <2.4L ENGINE>

13A-6

HEATED OXYGEN SENSOR

The heated oxygen sensor detects lean/rich oxygen 
in the exhaust. The heated oxygen sensor (front) and 
heated oxygen sensor (rear) are located in the front 
and rear of the dual manifold catalytic converter 
(MCC) respectively, which are 4 in total. With per-
forming the closed loop control per MCC by using the 

output signal from heated oxygen sensor (front), 
PCM corrects the output signal from the heated oxy-
gen sensor (front) by using the output signal from the 
heated oxygen sensor (rear). Accordingly, the heated 
oxygen sensor can control exhaust gas more accu-
rately than the conventional one.

THROTTLE VALVE OPENING ANGLE CONTROL

M2132015000041

The throttle valve opening angle control is basically 
the same as that for the 3.8L engine installed in the 
ENDEAVOR.

.

System Configuration Diagram

AK303329

THROTTLE
ACTUATOR
CONTROL
MOTOR

THROTTLE
POSITION
SENSOR

ACCELERATOR
PEDAL
POSITION
SENSOR

ENGINE 
CONTROL
UNIT

THROTTLE
VALVE
CONTROL
UNIT

PULSE WIDTH MODULATION
CONTROL

POWERTRAIN CONTROL MODULE

THROTTLE ACTUATOR
CONTROL MOTOR RELAY

MOTOR DRIVE CIRCUIT

ELECTRICAL

CURRENT

DETECTION

CIRCUIT

AB