Mitsubishi Montero Sport (2004+). Manual - part 203

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-225

STEP 5. Measure the power supply voltage at PCM 
connector C-89 by backprobing.
(1) Do not disconnect the connector C-89.
(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 4 and ground by 

backprobing.

• Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts) 

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

STEP 6. Check connector C-89 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 12.

AK103914

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AB

CONNECTOR: C-89

C-89(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AKX01534

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C-89 HARNESS 
CONNECTOR: 
HARNESS SIDE

AH

AK103914

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CONNECTOR: C-89

C-89(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-226

STEP 7. Check for open circuit or short circuit to ground 
between right bank heated oxygen sensor (front) 
connector A-07 (terminal No. 3) and PCM connector C-89 
(terminal No. 4).
Q: Is the harness wire in good condition?

YES : Replace the PCM. Then go to Step 12.
NO :  Repair it. Then go to Step 12.

AK200490

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A-07(B)

AB

CONNECTOR: A-07

HARNESS 
CONNECTOR: 
COMPONENT SIDE

RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)

AK103914

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CONNECTOR: C-89

C-89(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-227

STEP 8. Check connector C-89 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 9.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 12.

STEP 9. Check for harness damage between MFI relay 
connector C-59 (terminal No. 1) and right bank heated 
oxygen sensor (front) connector A-07 (terminal No. 1).

AK103914

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CONNECTOR: C-89

C-89(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK200023

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CONNECTOR: C-59

AB

C-59

HARNESS 
CONNECTOR:
COMPONENT 
SIDE

AK200490

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A-07(B)

AB

CONNECTOR: A-07

HARNESS 
CONNECTOR: 
COMPONENT SIDE

RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-228

NOTE: Check harness after checking intermediate connector 
C-14. If intermediate connector is damaged, repair or replace it. 
Refer to GROUP 00E, Harness Connector Inspection 

P.00E-2

. 

Then go to Step 12.
Q: Is the harness wire in good condition?

YES : Go to Step 10.
NO :  Repair it. Then go to Step 12.

STEP 10. Check for harness damage between right bank 
heated oxygen sensor (front) connector A-07 (terminal No. 
3) and PCM connector C-89 (terminal No. 4).
Q: Is the harness wire in good condition?

YES : Go to Step 11.
NO :  Repair it. Then go to Step 12.

AK200490

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3

4

A-07(B)

AB

CONNECTOR: A-07

HARNESS 
CONNECTOR: 
COMPONENT SIDE

RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)

AK103914

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AB

CONNECTOR: C-89

C-89(GR)

HARNESS CONNECTOR:
COMPONENT SIDE