Mitsubishi Montero (2004+). Manual - part 357

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-915

STEP 7. Check the continuity at PCM harness side 
connector D-133.
(1) Disconnect the connector D-133 and measure at the 

harness side.

(2) Check for the continuity between terminal No. 33, No. 42 

and ground.

• Should be less than 2 ohms.

Q: Does continuity exist?

YES : Go to Step 8.
NO :  Check harness connector D-14 at intermediate 

connector for damage, and repair or replace as 
required. Refer to GROUP 00E, Harness Connector 
Inspection 

P.00E-2

. If intermediate connector D-14 is 

in good condition, repair an open circuit or harness 
damage between PCM connector D-133 (terminal No. 
33, No. 42) and ground. Then confirm that the 
malfunction symptom is eliminated.

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CONNECTOR: D-133

HARNESS CONNECTOR: 
COMPONENT SIDE

PCM

D-133(GR)

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AK201377

D-133 HARNESS 

CONNECTOR: 

COMPONENT SIDE

AK201377AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-916

STEP 8. Measure the power supply voltage at PCM harness 
side connector D-133.
(1) Disconnect the connector D-133 and measure at the 

harness side.

(2) Measure the voltage between terminal No.57 and ground.

• Voltage should be battery positive voltage.

Q: Is battery positive voltage (approximately 12 volts) 

present?
YES : Go to Step 9.
NO :  Repair an open circuit between MFI relay connector 

B-22X (terminal No. 4) and PCM connector D-133 
(terminal No. 57). Then confirm that the malfunction 
symptom is eliminated.

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AB

CONNECTOR: D-133

HARNESS CONNECTOR: 
COMPONENT SIDE

PCM

D-133(GR)

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D-133 HARNESS 
CONNECTOR: 
COMPONENT SIDE

AK201378AB

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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-917

STEP 9. Measure the power supply voltage at PCM harness 
side connector D-133.
(1) Disconnect the connector D-133 and measure at the 

harness side.

(2) Using a jumper wire, connect terminal No. 57 to ground.

(3) Measure the voltage between terminal No. 34, No. 43 and 

ground.

• Voltage should be battery positive voltage.

Q: Is battery positive voltage (approximately 12 volts) 

present?
YES : Replace the PCM. Then confirm that the malfunction 

symptom is eliminated.

NO :  Check harness connector D-116 at intermediate 

connector for damage, and repair or replace as 
required. Refer to GROUP 00E, Harness Connector 
Inspection 

P.00E-2

. If intermediate connector D-116 

is in good condition, repair an open circuit between 
MFI relay connector B-22X (terminal No. 1) and PCM 
connector D-133 (terminal No. 34, No. 43). Then 
confirm that the malfunction symptom is eliminated.

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CONNECTOR: D-133

HARNESS CONNECTOR: 
COMPONENT SIDE

PCM

D-133(GR)

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D-133 HARNESS CONNECTOR: 
COMPONENT SIDE

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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-918

INSPECTION PROCEDURE 29: Fuel pump system.

M

BLUE-

BLA

CK

AK201158

BLA

C

K

BLA

C

K

B

LA

CK-BLUE

B

LA

CK-BLUE

BLUE-GREEN

BLA

C

K

BLUE-

BLA

CK

RED-

WHITE

BLUE-

BLA

CK

BLA

C

K-BLUE

BLA

CK-BLUE

BLA

CK-BLUE

BLA

CK-BLUE

BLA

CK-BLUE

3 4

1 2

B-24X

3 4

1 2

B-19X

FUEL PUMP
RELAY 2

FUEL PUMP
RELAY 1

POWERTRAIN
CONTROL
MODULE (PCM)

4

1

5

17

2

3

16

4

3

4 5

1 2 3

G-04

(MU802058)

8

R

IG2

ST

LOCK

ACC

IG1

2

IGNITION
SWITCH-IG

5

2

4

17

1

12 13 14

18

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34

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6 7

19

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42

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D-111

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1 2

D-204

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1

D-208

MU801331

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30 31

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24

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1

5

E-111

E-111

E-111

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9

1

3

6

11

2

4

8

5

10

D-221

(MU801866)

A-05

(MU802749)

8

7

6

5

1 2 3 4

F-07

MU802609

FUEL
PUMP

Fuel Pump Circuit

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2

3

5

6 7 8 9

4

20

21 22

232425

2627

10111213

14 15

16 1718

19

D-132

(MU803802)

FUSIBLE
LINK(1)

6

20A

RELAY 
BOX

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2 3

5

6 7

4

8