Mitsubishi Montero Sport (2004+). Manual - part 157

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-41

STEP 7. Check for open circuit and harness damage 
between volume airflow sensor connector A-01 (terminal 
No. 7) and PCM connector C-89 (terminal No. 19).
Q: Is the harness wire in good condition?

YES : Replace the PCM. Then go to Step 9.
NO :  Repair it. Then go to Step 9.

STEP 8. Replace the volume airflow sensor.
(1) Replace the volume airflow sensor.
(2) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle −  Procedure 6 − 

Other Monitor 

P.13A-4

.

(3) Check the diagnostic trouble code (DTC).
Q: Is DTC P0101 set?

YES : Replace the PCM. Then go to Step 9.
NO :  The procedure is complete.

STEP 9. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Procedure 6 − 

Other Monitor 

P.13A-4

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0101 set?

YES : Repeat the troubleshooting.
NO :  The procedure is complete.

AK103913

3

4

5

1

2

6

7

CONNECTOR: A-01

A-01(B)

AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

AK103914

2

3

4

5

6

7

8

9

11

12

13

14

15

16

17

18

19

20

30

21

22

23

24

25

26

27

28

29

31

32

33

34

35

1

10

AB

CONNECTOR: C-89

C-89(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK103913

3

4

5

1

2

6

7

CONNECTOR: A-01

A-01(B)

AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-42

DTC P0102: Volume Airflow Circuit Low Input

WHITE-

BL

ACK

WHITE-

BL

ACK

RED

RED

RED

BL

ACK

BL

ACK

GREEN-BL

UE

WHITE-BL

ACK

WHITE-

BL

ACK

1 2 3 4 5 6 7

1

10

2 3 4 5 6 7 8 9

11

12 13 14 15 16 17 18 19 20 21 22

23 24 25 26 27 28 29 30 31 32 33

47

41

42 43

48 49 50 51 52 53 54 55 56 57

46

45

44

58

59

60 61 62 63

64 65 66

10

2

3 4

5 6

7 8

9

11 12 13 14 15 16 17 18 19 20

30

21 22 23

24

25

26 27 28 29

31 32 33

34 35

1

AK301854

Volume Airflow Sensor Circuit

C-71

FUSIBLE LINK(12)

MFI RELAY

VOLUME
AIRFLOW
SENSOR

65

3

57

19

4

24

12

4

3

5

7

12

33

22

2

1

15

C-90
(MU803781)

C-89
(MU803784)

POWERTRAIN CONTROL MODULE (PCM)

A-01

C-59

5V

1

10

2 3 4 5 6 7 8 9

11

12 13 14 15 16 17 18 19 20 21 22

23 24 25 26 27 28 29 30 31 32 33

C-14

JOINT
CONNECTOR (5)

JOINT
CONNEC-
TOR (4)

1

2

3

4

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-43

.

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. 57).

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

sor output terminal (terminal No. 3) from the PCM 
(terminal No. 65). 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.

.

DESCRIPTIONS OF MONITOR METHODS
Volume airflow sensor output frequency is out of 

specified range.

.

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)

• Not applicable

.

AK103908

CONNECTOR: A-01

VOLUME 
AIRFLOW
SENSOR

A-01(B)

AE

AK201000

MFI RELAY

CONNECTOR: C-59

AB

C-59

AK103738AB

CONNECTORS: C-89, C-90

PCM

C-89(GR) C-90(GR)

AK103911AB

CONNECTOR: C-14

C-14

AK103912AB

CONNECTOR: C-71

C-71

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-44

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Engine speed is higher than 500 r/min.

Judgement Criteria

• Volume airflow sensor output frequency has con-

tinued to be 3.3 Hz or lower for 2 seconds.

.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Procedure 6 

− Other Monitor 

P.13A-4

.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this code to be set are: )

• Volume airflow sensor failed.

• Open or shorted volume airflow sensor circuit, 

harness damage or connector damage.

• PCM failed.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

START

MONITORING

CONDITIONS

END

NO

NO

NO

YES

YES

YES

MALFUNCTION

GOOD

OUTPUT FREQUENCY

< 3.3Hz

CONTINUOUS

FAILURE FOR 2 secs

AK301413