Mitsubishi Montero (2004+). Manual - part 136

 

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Mitsubishi Montero (2004+). Manual - part 136

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-31

.

PROBLEM SYMPTOMS TABLE (FOR YOUR INFORMATION)

Idling stability 
(engine stalls)

When the engine is cold, it stalls at idle (die out)

11

P.13A-871

When the engine is hot, it stalls at idle (die out)

12

P.13A-874

The engine stalls when accelerating (pass out)

13

P.13A-878

The engine stalls when decelerating

14

P.13A-879

Driving

Hesitation, sag or stumble

15

P.13A-881

Acceleration shock

16

P.13A-884

Deceleration shock

17

P.13A-884

Poor acceleration

18

P.13A-885

Surge

19

P.13A-889

Knocking

20

P.13A-892

Dieseling (Run-on)

21

P.13A-893

Too high CO and HC concentration when idling

22

P.13A-893

IM240 test 
failure

Transient, mass emission tailpipe test failure

23

P.13A-896

Purge flow test of the evaporative emission canister 
failure

24

P.13A-901

Pressure test of the evaporative system failure

25

P.13A-902

Improper idle speed when the A/C is operating (A/C switch 2 signal)

26

P.13A-903

A/C condenser fan is inoperative

27

P.13A-906

Power supply system and ignition switch-IG system

28

P.13A-908

Fuel pump system

29

P.13A-918

Ignition switch-ST system and transmission range switch system

30

P.13A-929

Ignition circuit system

31

P.13A-933

A/C system

32

P.13A-941

Accelerator pedal position switch system

33

P.13A-944

TROUBLE SYMPTOMS

INSPECTION 
PROCEDURE

REFERENCE 
PAGE

ITEMS

SYMPTOM

At Starting

Won't start 

The starter cranks the engine, but there is no combustion within the 
cylinders, and the engine won't start.

Starts up and 
dies

The engine starts, but then engine soon stalls.

Hard starting

Engine starts after cranking a while.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-32

Idling stability

Hunting

Engine speed doesn't remain constant; changes at idle.

Rough idle

Usually, a judgement can be based upon the movement of the 
tachometer pointer, and the vibration transmitted to the steering wheel, 
shift lever, body, etc.

Incorrect idle 
speed

The engine doesn't idle at the correct speed.

Engine stall (die 
out)

The engine stalls when the foot is taken from the accelerator pedal, 
regardless of whether the vehicle is moving or not. 

Engine stall 
(pass out)

The engine stalls when the accelerator pedal is depressed.

At Driving

Hesitation Sag

"Hesitation" is the delay in 
response of the vehicle speed 
(engine speed). This occurs when 
the accelerator is depressed in 
order to accelerate from the speed 
at which the vehicle is now 
traveling, or a temporary drop in 
vehicle speed (engine speed) 
during such acceleration. 
Serious hesitation is called "sag".

Poor 
acceleration

Poor acceleration is inability to obtain an acceleration corresponding to 
the degree of throttle opening, even though acceleration is smooth. 
Also the inability to reach maximum speed. 

Stumble

Engine speed increase is delayed 
when the accelerator pedal is 
initially depressed for acceleration. 

Shock

The feeling of a comparatively large impact or vibration when the 
engine is accelerated or decelerated. 

Surge

This is slight acceleration and deceleration feel usually felt during 
steady, light throttle cruise. Most notable under light loads.

Knocking

A sharp sound during driving, which sounds like a hammer striking the 
cylinder walls. It makes poor driveability.

At Stopped

Run on 
("Dieseling") 

The condition in which the engine continues to run after the ignition 
switch is turned to the "LOCK" (OFF) position. Also called "dieseling".

ITEMS

SYMPTOM

AKX01361

VEHICLE
SPEED

TIME

NORMAL

HESITATION

SAG

INITIAL
ACCELE-
RATOR
PEDAL
DEPRE-
SSION

AKX01361AB

AKX01362

VEHICLE
SPEED

TIME

NORMAL

STUMBLE

INITIAL
ACCEL-
ERATOR
PEDAL 
DEP-
RESSION

IDLING

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-33

DIAGNOSTIC TROUBLE CODE PROCEDURES

DTC P0101: Volume Airflow Circuit Range/Performance Ploblem

1 2 3 4 5 6 7

3 4

1 2

RED

GREEN

WHITE-BLA

CK

SKY B

U

LE

WHITE-

BLA

C

K

WHITE-

BLA

C

K

AK201126

B-48

B-22X

MFI 
RELAY

BATTERY

VOLUME AIRFLOW 
SENSOR

POWERTRAIN CONTROL MODULE(PCM)

5 V

37

7

88

63

4

3

2

5

3

1

4

Volume Airflow Sensor Circuit

31

35363738394041 42 43
444546474849

50 51

5253

545556

57 58

32

33 34

D-133

(MU803803)

61
656667686970 717273
74757677787980 8182
8384

858687

8889

62

6364

D-134

(MU803804)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-34

.

CIRCUIT OPERATION

• The volume airflow sensor power is supplied from 

the MFI relay (terminal No. 1), and the ground is 
provided on the PCM (terminal No. 88).

• 5-volt power is applied to the volume airflow sen-

sor output terminal (terminal No. 3) from the PCM 
(terminal No. 63). The volume airflow sensor gen-
erates a pulse signal when the output terminal 
and ground are opened/closed (opened/short).

.

TECHNICAL DESCRIPTION

• While the engine is running, the volume airflow 

sensor outputs a pulse signal which corresponds 
to the volume of air flow.

• The PCM checks whether the frequency of this 

signal output by the volume airflow sensor while 
the engine is running is at or above the set value.

• When the throttle position sensor output voltage 

is low, the PCM causes the power transistor to be 
"ON" to send an volume airflow sensor reset sig-
nal to the volume airflow sensor. In response to 
the reset signal, the volume airflow sensor resets 
the filter circuit and improves the ability of the vol-
ume airflow sensor to measure the amount of air 
in a small air intake region.

.

DESCRIPTIONS OF MONITOR METHODS

• An abnormal condition is detected in the volume 

airflow sensor output through a comparison 
between the driving load and the output fre-
quency of the volume airflow sensor.

.

MONITOR EXECUTION

• Continuous

.

MONITOR EXECUTION CONDITIONS (Other 
monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Throttle position sensor

.

AK201039

MFI RELAY

B-22X

AB

CONNECTOR: B-22X

AK201038AH

CONNECTORS: D-133, D-134

PCM

D-134(GR)

D-133(GR)

AK200940AD

B-48(B)

CONNECTOR: B-48

VOLUME AIRFLOW 
SENSOR

 

 

 

 

 

 

 

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