Mitsubishi Galant (2004+). Manual - part 1271

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-777

STEP 6. Using scan tool MB991958, check data list item 29: 
Evaporative emission ventilation solenoid.

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) Remove the fuel tank filler tube protector (Refer to GROUP 

13C, Fuel Tank 

P.13C-10

).

(3) Disconnect the hose G and evaporative emission canister 

connection, and connect the hand vacuum pump to the 
hose G.

(4) Turn the ignition switch to the "ON" position.
(5) Set scan tool MB991958 to actuator test mode.

• Item 29: Evaporative Emission Ventilation Solenoid.

• While the evaporative emission ventilation solenoid 

is energized, operate the hand vacuum pump and 
confirm that the solenoid holds vacuum.

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

disconnect scan tool MB991958.

(7) Disconnect the hand vacuum pump, and connect hose G to 

the evaporative emission canister.

(8) Reinstall the fuel tank filler tube protector (Refer to GROUP 

13C, Fuel Tank 

P.13C-10

).

Q: Did the evaporative emission ventilation solenoid hold 

vacuum?
YES : Go to Step 7.
NO :  Replace the evaporative emission ventilation solenoid 

(Refer to GROUP 17, Evaporative emission canister 
and fuel tank pressure relief valve removal and 
installation 

P.17-97

). Then go to Step 15.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC306777

AC

HOSE G

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-778

STEP 7. Pressure test the evaporative emission system 
lines from hoses H to M.

(1) Disconnect hose H from the evaporative emission canister, 

and plug hose H securely.

(2) Confirm that the evaporative emission system pressure 

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

(3) Remove the fuel cap.

(4) Connect the evaporative emission system pressure pump 

(Miller number 6872A) to the fuel tank filler tube by using 
fuel tank adapter (MLR-8382).

(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) Remove  the evaporative emission system pressure pump 

(Miller number 6872A) and the fuel tank adapter 
(MLR-8382), and reinstall the fuel cap.

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

YES : Go to Step 13.
NO :  Go to Step 8.

AC306778

AC

HOSE H

PLUG

AC306661

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-779

STEP 8. Check for leaks in evaporative emission hoses H 
through J.

(1) Remove the fuel tank filler tube protector (Refer to GROUP 

13C, Fuel Tank 

P.13C-10

).

(2) Use a hand vacuum pump to test each hose from hose H to 

hose J.

Q: Do the hoses hold vacuum?

YES :  Go to Step 9.
NO :  Replace any damaged hose. Then go to Step 15.

STEP 9. Test check valve.

(1) Check valve is a one-way check valve.

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

only?
YES : Go to Step 10.
NO :  Replace check valve, and reinstall the fuel tank filler 

tube protector (Refer to GROUP 13C, Fuel Tank 

P.13C-10

). Then go to Step 15.

AC306401

HOSE H

AE

AC306800

AC

HOSE I

HOSE J

AC306800

AD

CHECK VALVE

AC306332

AB

CHECK VALVE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-780

STEP 10. Check for leaks in evaporative emission hoses K 
and L.

Use a hand vacuum pump to test each hose K and L.

Q: Do the hoses hold vacuum?

YES :  Go to Step 11.
NO :  Replace any damaged hose. Then go to Step 15.

STEP 11. Check for leaks in evaporative emission hose M.
(1) Remove the fuel tank assembly (Refer to GROUP 13C, 

Fuel Tank 

P.13C-10

).

(2) Use the hand vacuum pump to check the hose M.
Q: Is the hose hold vacuum?

YES :  Go to Step 12.
NO :  Replace the hose and reinstall the fuel tank assembly 

(Refer to GROUP 13C, Fuel Tank 

P.13C-10

). Then go 

to Step 15.

STEP 12. Check for leaks in the fuel tank.

(1) Visually check for cracks or other leaks in the fuel tank.

NOTE: Carefully check the fuel pump module and the fuel 
tank differential pressure sensor installation in the fuel tank.

AC306776

AC

HOSE L

HOSE K

AC305683AC

HOSE M

AC305683