Mitsubishi Montero (2004+). Manual - part 138

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-39

STEP 4. Check for short circuit to ground between volume 
airflow sensor connector B-48 (terminal No. 7) and PCM 
connector D-133 (terminal No. 37).
Q: Is the harness wire in good condition?

YES : Replace the volume airflow sensor. Then go to Step 

9.

NO :  Repair it. Then go to Step 9.

AK200937

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1

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6

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AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

CONNECTOR: B-48

B-48(B)

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AB

CONNECTOR: D-133

HARNESS CONNECTOR: 
COMPONENT SIDE

PCM

D-133(GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-40

STEP 5. Measure the reset signal voltage at volume airflow 
sensor connector B-48 by backprobing.
(1) Do not disconnect the connector B-48.
(2) Start the engine and run at idle.

(3) Measure the voltage between terminal No. 7 and ground by 

backprobing.

• When the engine idling, voltage should be 1.0 volt or 

less.

• When the engine speed is 3,000 r/min, voltage should 

be between 6.0 and 9.0 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?

YES : Go to Step 8.
NO :  Go to Step 6.

STEP 6. Check connector B-48 at volume airflow sensor 
and connector D-133 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 7.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 9.

AK200937

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AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

CONNECTOR: B-48

B-48(B)

AKX01515

6 7

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AKX01515

AJ

B-48 HARNESS 
CONNECTOR: 
HARNESS SIDE

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AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

CONNECTOR: B-48

B-48(B)

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AB

CONNECTOR: D-133

HARNESS CONNECTOR: 
COMPONENT SIDE

PCM

D-133(GR)

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 B-48 (terminal 
No. 7) and PCM connector D-133 (terminal No. 37).
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 inspection 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 : Retry the troubleshooting.
NO :  The inspection is complete.

AK200937

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AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

CONNECTOR: B-48

B-48(B)

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CONNECTOR: D-133

HARNESS CONNECTOR: 
COMPONENT SIDE

PCM

D-133(GR)

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AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

CONNECTOR: B-48

B-48(B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-42

DTC P0102: Volume Airflow Circuit Low Input

1 2 3 4 5 6 7

3 4

1 2

RED

GREEN

WHITE-BLA

CK

SKY B

U

LE

WHITE-

BLA

CK

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

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5

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1

4

Volume Airflow Sensor Circuit

31

35363738394041 42 43
444546474849

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5253

545556

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32

33 34

D-133

(MU803803)

61
656667686970 717273
74757677787980 8182
8384

858687

8889

62

6364

D-134

(MU803804)