Mitsubishi Montero (2004+). Manual - part 284

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-623

STEP 16. Check for leaks in the evaporative emission 
canister.
(1) Remove the evaporative emission canister. (Refer to 

GROUP 17, Evaporative Emission Canister and Fuel Tank 
Pressure Relief Valve 

P.17-72

).

(2) Connect a hand vacuum pump to the vent nipple of the 

evaporative emission canister.

(3) Plug the other two nipples or loop a hose between them.
(4) Apply vacuum with the hand vacuum pump and confirm that 

the canister holds vacuum.

Q: Does the evaporative emission canister hold vacuum?

YES : Reinstall the evaporative emission canister. (Refer to 

GROUP 17, Evaporative Emission Canister and Fuel 
Tank Pressure Relief Valve 

P.17-72

). Go to Step 17       

.

NO :  Replace the evaporative emission canister. (Refer to 

GROUP 17, Evaporative Emission Canister and Fuel 
Tank Pressure Relief Valve 

P.17-72

). Go to Step 26       

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-624

STEP 17. Pressure test for clogging in evaporative 
emission system lines between hose F and R.
(1) Disconnect hose F from the evaporative emission canister 

and plug hose F securely.

(2) Confirm that the evaporative emission system pressure 

pump (Miller number 6872A) is operating properly. Perform 
the self-test as described in the manufacturer's instructions.

(3) Remove the fuel cap.

(4) Connect the evaporative emission system pressure pump 

to the fuel tank filler tube.

(5) After it is confirmed that pressure maintained, unplug hose 

F.

(6) Disconnect the evaporative emission system pressure 

pump and reinstall the fuel cap.

(7) Connect hose F to the evaporative emission canister.
Q: Does hose F blow the air?

YES : Go to Step 23.
NO :  Go to Step 18.

AC102602 AC

HOSE F

ACX01358

AC102548

HOSE F

AC

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-625

STEP 18. Check for clogging in the evaporator line hose F.
(1) Remove the fuel tank filler tube protector. (Refer to GROUP 

13B, Fuel Tank 

P.13B-8

).

(2) Disconnect hose F from the evaporative emission canister 

and plug hose F securely.

(3) Disconnect hose G from the evaporative emission canister 

side, and connect a hand vacuum pump.

(4) Apply vacuum with the hand vacuum pump, unplug hose F.
(5) Disconnect the hand vacuum pump and connect hose F 

and G. 

Q: Does hose F blow the air?

YES : Go to Step 19.
NO :  Replace hose F and reinstall the fuel tank filler tube 

protector. (Refer to GROUP 13B, Fuel Tank 

P.13B-8

). 

Go to Step 26.

STEP 19. Check for clogging in the evaporative emission 
system hoses G through N.
(1) Remove the fuel tank filler tube. (Refer to GROUP 13B, 

Fuel Tank 

P.13B-8

).

(2) Use a hand vacuum pump to clogging test on each hose 

from hose G to hose N. 

Q: Are the hoses in good condition?

YES : Go to Step 20.
NO :  Replace any damaged hose, and reinstall the fuel 

tank filler tube and the fuel tank filler tube protector. 
(Refer to GROUP 13B, Fuel Tank 

P.13B-8

). Go to 

Step 26.

AC101767 AC

HOSE F

HOSE G

AC102548

HOSE F

AC

AC102673 AC

HOSE G

HOSE L

HOSE M

HOSE N

AC102646 AC

HOSE K

HOSE I

HOSE H

HOSE J

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-626

STEP 20. Check the check valve A.
(1) Check valve A is a one-way check valve.

(2) Check valve A should allow air to flow in only one direction.
Q: Does check valve A allow air to press in one direction 

only?
YES : Go to Step 21.
NO :  Replace check valve A, and reinstall the fuel tank filler 

tube and the fuel tank filler tube protector. (Refer to 
GROUP 13B, Fuel Tank 

P.13B-8

). Go to Step 26.

STEP 21. Check the check valve B.
(1) Check valve B is a one-way check valve.

(2) Check valve B should allow air to flow in only one direction.
Q: Does check valve B allow air to press in one direction 

only?
YES : Go to Step 22.
NO :  Replace check valve B, and reinstall the fuel tank filler 

tube and the fuel tank filler tube protector. (Refer to 
GROUP 13B, Fuel Tank 

P.13B-8

). Go to Step 26.

AC102646 AD

CHECK
VALVE A

AC002076 AB

CHECK VALVE A

AC102646 AE

CHECK
VALVE B

AC002078

CHECK VALVE B

AB