Mitsubishi Galant (2004+). Manual - part 1241

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-657

STEP 2. Check the evaporative emission purge solenoid 
for leaks.

(1) Disconnect hose B from the evaporative emission purge 

solenoid and connect a hand vacuum pump to the nipple of 
the evaporative emission purge solenoid.

(2) Use the hand vacuum pump to confirm that the evaporative 

emission purge solenoid holds vacuum.

(3) Disconnect the hand vacuum pump, and reconnect hose B 

to the evaporative emission purge solenoid.

Q: Does the evaporative emission purge solenoid hold 

vacuum?
YES : Go to Step 3.
NO :  Replace the evaporative emission purge solenoid. 

Then go to Step 15.

STEP 3. Check for leaks in evaporative emission hoses A 
through D.

Use a hand vacuum pump to test each hose from hose A to 
hose D.

Q: Do the hoses hold vacuum?

YES : Go to Step 4.
NO :  Replace any damaged hose. Then go to Step 15.

STEP 4. Check for leaks in the chamber.

(1) Connect a hand vacuum pump to the nipple.
(2) Plug the other nipple.

(3) Apply vacuum with the hand vacuum pump, and confirm 

that the applied vacuum does not fluctuate.

Q: Is the chamber in good condition?

YES : Go to Step 5.
NO :  Replace the chamber. Then go to Step 15.

AC306390AB

HOSE B

AC306388

AC306389AB

HOSE C

HOSE B

HOSE A

AC306799

AB

HOSE D

THROTTLE BODY

AC306388

AC306389AC

CHAMBER

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-658

STEP 5. Check for leaks in evaporative emission hoses E 
through G.

Use a hand vacuum pump to test each hose from hose E to 
hose G.

Q: Do the hoses hold vacuum?

YES :  Go to Step 6.
NO :  Replace any damaged hose. Then go to Step 15.

AC306710

HOSE E

AC

AC306401

HOSE G

HOSE F

AD

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-659

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-660

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