Mitsubishi Montero (2004+). Manual - part 285

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-627

STEP 22. Check for clogging in the evaporative emission 
system hoses O through R.
(1) Remove the fuel tank. (Refer to GROUP 13B, Fuel Tank 

P.13B-8

).

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

from hose O to hose R. 

Q: Are the hoses in good condition?

YES : Go to Step 25.
NO :  Replace any damaged hose, and reinstall the fuel 

tank, 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 23. Check for clogging in the evaporative emission 
system hose C and hose D.
(1) Remove the fuel tank. (Refer to GROUP 13B, Fuel Tank 

P.13B-8

).

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

and hose D. 

Q: Are the hoses in good condition?

YES : Reinstall the fuel tank. (Refer to GROUP 13B, Fuel 

Tank 

P.13B-8

). Go to Step 24.

NO :  Replace any damaged hose and reinstall the fuel 

tank. (Refer to GROUP 13B, Fuel Tank 

P.13B-8

). Go 

to Step 26.

AC101748

HOSE P

HOSE R

AD

HOSE O

ACX01353 AC

HOSE Q

ACX01354 AD

HOSE C

AC102448

HOSE D

AC

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-628

STEP 24. Check for clogging 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 the other 

nipples.

(4) Apply a pressure on the vacuum pump.
(5) When each nipple is unplugged, air should pass through the 

unplugged nipple.

Q: Is the evaporative emission canister in good condition?

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 25       

.

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-629

STEP 25. Using scan tool MB991958, check evaporative 
emission system monitor test.

CAUTION

• To prevent damage to scan tool MB991958, always turn 

the ignition switch to the "LOCK" (OFF) position before 
connecting or disconnecting scan tool MB991958.

• During this test, the PCM automatically increases the 

engine speed to 1,600 r/min or greater. Check that the 
transmission is set to "P" position.

(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Erase the DTCs using scan tool MB991958. 
(4) Check that the fuel cap is securely closed. (Tighten until 

three clicks are heard).

(5) Start the engine.
(6) Select "System Test".
(7) Select "Evap Leak Mon".
(8) During this test, keep the accelerator pedal at the idling 

position.

(9) Keep the engine speed and engine load within the specified 

range. When the monitor test starts, the "In Progress" item 
on scan tool MB991958 will change from "NO" to "YES".

(10)Turn the ignition switch to the "LOCK" (OFF) position and 

disconnect scan tool MB991958.

Q: Is "Evap Leak Mon. Completed. Test Failed and DTCs 

Set" displayed on scan tool MB991958?
YES : Replace the PCM (Refer to 

P.13A-1014

). Then go to 

Step 26 .

NO <"Evap Leak Mon. Completed. Test Passed" is 
displayed on scan tool MB991958.> : The evaporative 

emission system is working properly at this time. Go 
to Step 26        .

NO <"Evap Leak Mon. Discontinued. Retest again from 
the first" is displayed on scan tool  MB991958.> : The 

EVAP monitor has been interrupted during the test. 
Turn the ignition switch to the "LOCK" (OFF) position 
once, and repeat the monitoring from Step 25.

STEP 26. Perform the OBD-II drive cycle.
(1) Confirm the repair by performing the appropriate drive cycle  

(Refer to Diagnostic Function 

− OBD-ll Drive Cycle − 

Procedure 1 

− Evaporative Emission System Leak Monitor 

P.13A-4

).

(2) Read the diagnostic trouble code (DTC).
Q: Is DTC P0455 set?

YES : Repeat the troubleshooting from Step 1.
NO :  The procedure is complete.

AC306409AF

MB991911

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-630

DTC P0456: Evaporative Emission System Leak Detected (Very Small Leak)

.

TECHNICAL DESCRIPTION

• The PCM monitors the Evaporative Emission 

(EVAP) System pressure.

• The PCM controls the evaporative emission ven-

tilation solenoid. It closes the evaporative emis-
sion ventilation solenoid to seal the evaporative 
emission canister side of the system.

AC203991

SYSTEM DIAGRAM

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

Q

S

R

P

FUEL TANK

CHECK VALVE B

CHECK VALVE A

EVAPORATIVE
EMISSION
PURGE
SOLENOID

EVAPORATIVE EMISSION
VENTILATION SOLENOID

EVAPORATIVE
EMISSION
CANISTER

VENT PIPE
ASSEMBLY

AD

ONBOARD REFUELING
VAPOR RECOVERY(ORVR)
VENT VALVE MODULE

AC101766

EVAPORATIVE EMISSION CANISTER

AB

AC203904

AC

EVAPORATIVE EMISSION
PURGE SOLENOID

INTAKE AIR DUCT

AC101763 AB

REAR COIL SPRING (RH)

EVAPORATIVE EMISSION VENTILATION 
SOLENOID