Mitsubishi Montero (2002-2004). Manual - part 554

GENERAL DESCRIPTION

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13Aa-3

MULTIPORT FUEL INJECTION (MFI) SYSTEM DIAGRAM

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

−

 Vacuum Hoses 

−

 Vac-

uum Hose Routing 

P.17-56

.

AK201103

1   LEFT BANK HEATED OXYGEN SENSOR (FRONT)
2   VOLUME AIRFLOW SENSOR
3   INTAKE AIR TEMPERATURE SENSOR
4   THROTTLE POSITION SENSOR (MAIN/SUB)
5   CAMSHAFT POSITION SENSOR
6   CRANKSHAFT POSITION SENSOR
7   BAROMETRIC PRESSURE SENSOR
8   ENGINE COOLANT TEMPERATURE SENSOR
9   LEFT BANK HEATED OXYGEN SENSOR (REAR)
10 RIGHT BANK HEATED OXYGEN SENSOR (FRONT)
11 RIGHT BANK HEATED OXYGEN SENSOR (REAR)
12 FUEL TANK DIFFERENTIAL PRESSURE SENSOR
13 MANIFOLD DIFFERENTIAL PRESSURE SENSOR
14 FUEL TANK TEMPERATURE SENSOR
15 FUEL LEVEL SENSOR

     POWER SUPPLY
     ACCELERATOR PEDAL POSITION SENSOR 
     (MAIN/SUB)
     ACCELERATOR PEDAL POSITION SWITCH
     VEHICLE SPEED SENSOR
     A/C SWITCH 1, 2
     TRANSMISSION RANGE SWITCH
     POWER STEERING PRESSURE SWITCH
     IGNITION SWITCH - ST
     KNOCK SENSOR

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

     FUEL PUMP RELAY
     MULTIPORT FUEL INJECTION
     (MFI) RELAY
     THROTTLE ACTUATOR CONTROL 
     MOTOR RELAY
     A/C COMPRESSER CLUTCH RELAY
     MALFUNCTION INDICATOR LAMP
     (SERVICE ENGINE SOON OR
       CHECK ENGINE LAMP)
      DIAGNOSTIC OUTPUT
      IGNITION COIL, IGNITION POWER
      TRANSISTER

PCM

SENSE

DECIDE

ACT

1 LEFT BANK HEATED 
   OXYGEN SENSOR 
   (FRONT)

6 CRANKSHAFT POSITION SENSOR

11 RIGHT BANK 
     HEATED OXYGEN 
     SENSOR (REAR)

9 LEFT BANK HEATED 
   OXYGEN SENSOR (REAR)

5 CAMSHAFT POSITION
   SENSOR

1 INJECTOR

M*

M*

6 INTAKE MANIFOLD 
   TUNING SOLENOID

VACUUM TANK

3 THROTTLE
   ACTUATOR
   CONTROL
   MOTOR

2 EVAPORATIVE EMISSION
   PURGE SOLENOID

5 EGR VALVE
   (STEPPER
    MOTOR)

4

EVAPORATIVE 
EMISSION
CANISTER

FUEL 
TANK

FROM
FUEL
PUMP

8

2, 7

VOLUME AIRFLOW SENSOR
(WITH BAROMETRIC
PRESSURE SENSOR)

3 INTAKE AIR 
   TEMPERATURE SENSOR

AIR 
INLET

12 FUEL TANK
     DIFFERENTIAL
     PRESSURE 
     SENSOR

14 FUEL TANK 
     TEMPERATURE
     SENSOR

15 FUEL 
     LEVEL
     SENSOR

4   THROTTLE POSITION SENSOR
     (MAIN/SUB)

TO
FUEL
TANK

FUEL
PRESSURE
REGULATOR

13 MANIFOLD
     DIFFERENTIAL
     PRESSURE
     SENSOR

ENGINE 
COOLANT 
TEMPERATURE
SENSOR

10 RIGHT BANK 

HEATED 
OXYGEN 
SENSOR
(FRONT)

NOTE
*: Manifold port

EVAPORATIVE EMISSION
VENTILATION SOLENOID

EVAPORATIVE EMISSION
VENTILATION VALVE

SPECIAL TOOLS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13Aa-4

SPECIAL TOOLS

M1131000600245

TOOL

TOOL NUMBER AND 
NAME

SUPERSESSION

APPLICATION

MB991502
Scan tool <MUT-II>

MB991496-OD

• Reading diagnostic 

trouble code

• MFI system inspection

• Measurement of fuel 

pressure

MB991348
Test harness set

MB991348-01

• Inspection of throttle 

position sensor

• Inspection using an 

oscilloscope

MB991658
Test harness SET

Tool not available

• Inspection using an 

oscilloscope

• Adjustment of 

accelerator pedal 
position sensor

MB991709
Test harness set

MB991709-01

Inspection using an 
oscilloscope

MD998474
Test harness (8 pin, 
square)

MD998474-01

Inspection using an 
oscilloscope

MD998464
Test harness (4 pin, 
square)

MD998464-01

• Inspection of heated 

oxygen sensor

• Inspection using an 

oscilloscope

MB991316
Test harness (4 pin, 
square)

Tool not available

Inspection of heated 
oxygen sensor

B991502

MB991348

MB991658

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13Aa-5

ON-VEHICLE SERVICE

COMPONENT LOCATION

M1131002100451

MD998478
Test harness (3 pin, 
triangle)

MD998478-01

Inspection using an 
oscilloscope

MB991637
Fuel pressure gauge set

Tool not available

Measurement of fuel 
pressure

MD998709
Adaptor hose

MIT210196

Measurement of fuel 
pressure

MD998742
Hose adaptor

MD998742-01

Measurement of fuel 
pressure

TOOL

TOOL NUMBER AND 
NAME

SUPERSESSION

APPLICATION

MB991637

NAME

SYMBOL

NAME

SYMBOL

Accelerator pedal position sensor (with 
built-in accelerator pedal position 
switch)

S

Left bank heated oxygen sensor 
(front)

I

Air conditioning compressor clutch relay K

Left bank heated oxygen sensor 
(rear)

V

Camshaft position sensor

G

Malfunction Indicator Lamp 
(SERVICE ENGINE SOON or check 
engine lamp)

R

Crankshaft position sensor

M

Manifold differential pressure sensor F

Data link connector

T

Multiport fuel injection (MFI) relay

J

EGR valve

D

Powertrain control module

U

Engine coolant temperature sensor

L

Power steering pressure switch

Q

Evaporative emission purge solenoid

E

Right bank heated oxygen sensor 
(front)

B

Evaporative emission ventilation 
solenoid

X

Right bank heated oxygen sensor 
(rear)

Y

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13Aa-6

Fuel level sensor

a

Throttle actuator control motor

C

Fuel pump relay

J

Throttle actuator control motor relay J

Fuel tank differential pressure sensor

a

Throttle position sensor

C

Fuel tank temperature sensor

a

Transmission range switch

Z

Ignition coil

H

Intake manifold tuning solenoid

P

Injector

O

Vehicle speed sensor

W

Intake manifold tuning solenoid

P

Volume airflow sensor (with built-in 
intake air temperature sensor and 
barometric pressure sensor)

A

Knock sensor

N

NAME

SYMBOL

NAME

SYMBOL

AK201271

AB

L

M

N

O

P

Q

A

B

C

D

E

F

G

H

I

J

K

R

T

S

V

W

Y

Z

a

U

X

AK200940AE

VOLUME AIRFLOW 
SENSOR

A