Mitsubishi Montero (2004+). Manual - part 282

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-615

STEP 3. Check for leaks and clogging in the evaporative 
emission system hoses A and hose B.

Using a hand vacuum pump, do leakage test and clogging 
test on each hose A and B.

Q: Are the hoses in good condition?

YES : Go to Step 4.
NO :  Replace any damaged hose. Go to Step 26.

AC203994 AB

HOSE A

HOSE B

EVAPORATIVE EMISSION

PURGE SOLENOID

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-616

STEP 4. Check the evaporative emission ventilation 
solenoid using scan tool MB991958. (Actuator test item 
29).

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 S from the evaporative emission 

ventilation solenoid and connect a hand vacuum pump.

(3) Turn the ignition switch to the "ON" position.
(4) Set scan tool MB991958 to actuator test mode for item 29: 

Evaporative Emission Ventilation Solenoid Valve. While the 
evaporative emission ventilation solenoid is energized, 
operate the hand vacuum pump and confirm that solenoid 
holds vacuum.

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

disconnect scan tool MB991958.

(6) Disconnect the hand vacuum pump and connect hose S to 

the evaporative emission ventilation solenoid.

Q: Does the evaporative emission ventilation solenoid hold 

vacuum?
YES : Go to Step 5.
NO :  Replace the evaporative emission ventilation 

solenoid. (Refer to GROUP 17, Evaporative Emission 
Canister and Fuel Tank Pressure Relief Valve 

P.17-72

). Go to Step 26.

AC306409AF

MB991911

MB991824

MB991827

AC101769

HOSE S

AC

EVAPORATIVE EMISSION

VENTILATION SOLENOID

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-617

STEP 5. Check for leaks and clogging in the evaporative 
emission system hose S.

Using a hand vacuum pump, do leakage test and clogging 
test on hose S.

Q: Does hose S in good condition?

YES : Go to Step 6.
NO :  Replace hose S. Go to Step 26.

STEP 6. Check for leaks and clogging in evaporative 
emission system hose E

Using a hand vacuum pump, do leakage test and clogging 
test on hose E.

Q: Does hose E in good condition?

YES : Go to Step 7.
NO :  Replace hose E. Go to Step 26.

AC102452

HOSE S

AC

OVER VENT

VALVE

MODULE

AC101772

HOSE E

AC

EVAPORATIVE EMISSION

CANISTER

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-618

STEP 7. Pressure test the 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) Pressure test the system to determine whether any leaks 

are present.
NOTE: The "Pressure test" in this procedure refers to the 
I/M240 Simulation Test. The eight steps of this test are 
described in the manufacturer's instructions for the evapo-
rative emission system pressure pump, Miller number 
6872A.

(6) Disconnect the evaporative emission system pressure 

pump and reinstall the fuel cap.

(7) Connect hose F to the evaporative emission canister.
Q: Is the evaporative emission system line free of leaks?

YES : Go to Step 15.
NO :  Go to Step 8.

STEP 8. Check for leaks 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 and confirm that 

the vacuum holds.

(5) Disconnect the hand vacuum pump and connect hose F 

and G. 

Q: Does hose F hold vacuum?

YES : Go to Step 9.
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.

AC102602 AC

HOSE F

ACX01358

AC101767 AC

HOSE F

HOSE G