Mitsubishi Montero Sport (2004+). Manual - part 297

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-601

Q: Are the connectors in good condition?

YES : It can be assumed that this malfunction is intermittent. 

(Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunction 

P.00-7

). Then go 

to Step 16 .

NO :  Repair or replace the damaged component. (Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

). Then go to Step 16 .

PCM

60

46

66

57

45

44

64

55 56

65

62 63

52 53

5051

61

42

59

48

41
47
58

43
49

54

AC202313

C-90 (GR)

AC

CONNECTOR: C-90

C-90 (GR)

C-90 HARNESS SIDE CONNECTOR 

AC002614

CONNECTOR: E-28

FUEL TANK
DIFFERENTIAL
PRESSURE
SENSOR

AH

E-28 (B)

2 1

3

E-28 HARNESS SIDE 
CONNECTOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-602

STEP 14. Check connector C-90 at PCM for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Are the connectors in good condition?

YES : Go to Step 15 .
NO :  Repair or replace the damaged components. (Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

). Then go to Step 16 .

PCM

60

46

66

57

45

44

64

55 56

65

62 63

52 53

5051

61

42

59

48

41
47
58

43
49

54

AC202313

C-90 (GR)

AC

CONNECTOR: C-90

C-90 (GR)

C-90 HARNESS SIDE CONNECTOR 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-603

STEP 15. Using scan tool MB991958, check data list item 
73: Fuel Tank Differential Pressure Sensor. 

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.

(2) Disconnect hose E from the evaporative emission canister 

side, and plug the hose.

(3) Turn the ignition switch to the "ON" position.
(4) Remove the fuel cap.
(5) Set scan tool MB991958 to the data reading mode.

• Item 73, Fuel Tank Differential Pressure Sensor.

• The fuel tank pressures reading on the scan tool 

should be 

−3.3 to 3.3 kPa (−0.97 to 0.97 inHg).

(6) Connect an evaporative emission system pressure pump to 

the fuel filler neck and pressurize the fuel tank.

• The fuel tank pressure reading should increase.

(7) Turn the ignition switch to the "LOCK" (OFF) position. Then 

disconnect scan tool MB991958.

(8) Disconnect the evaporative emission system pressure 

pump, and reinstall the fuel cap.

(9) Connect hose E to the canister.
Q: Is the fuel tank pressure between 

−3.3 and 3.3 kPa 

(

−0.97 and 0.97 inHg)?

YES : It can be assumed that this malfunction is intermittent. 

(Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunction 

P.00-7

). Then go 

to Step 16 .

NO :  Replace the PCM. Then go to Step 16 .

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AC005140

HOSE E

AC

ACX01358

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-604

STEP 16. Perform the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. (Refer to 

P.13A-4

).

(2) Read the DTC.
Q: Is DTC P0453 set?

YES : Return to Step 2 .
NO :  The procedure is complete.