Mitsubishi Lancer Evolution X. Manual - part 356

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-489

STEP 5. Check for leaks in evaporative emission hoses C 
and D.
Use a hand vacuum pump to test each hose C and D.
Q: Do the hoses hold vacuum?

YES : Go to Step 6 .
NO :  Replace any damaged hose. Then go to Step 14 .

STEP 6. Using scan tool MB991958, check actuator test 
item 15: Evaporative emission ventilation solenoid.
(1) Remove the canister cover.
(2) Remove the evaporative emission ventilation solenoid. Do 

not disconnect the connector.

(3) Connect the hose of the hand vacuum pump to the canister 

side nipple of the evaporative emission ventilation solenoid.

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

• Item 15: 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.
(7) Disconnect the hand vacuum pump, and reinstall the 

evaporative emission ventilation solenoid.

(8) Reinstall the canister cover.
Q: Did the evaporative emission ventilation solenoid hold 

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

solenoid. Then go to Step 14 .

AK704689

Hose C

AB

AK704690 AB

Hose D

AK704699 AB

Evaporative emission
ventilation solenoid

Canister
side nipple

Evaporative emission
ventilation solenoid

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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STEP 7. Perform the pressure test on the evaporative 
emission system.
(1) Disconnect hose E from the canister while holding the 

release buttons indicated in the illustration pressed by 
fingers.

(2) Plug the disconnected end of hose E.
(3) 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.

(4) Remove the fuel cap.

(5) Connect the evaporative emission system pressure pump 

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

(6) 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.

(7) Remove the evaporative emission system pressure pump 

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

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

YES : Go to Step 12 .
NO :  Go to Step 8 .

AK704691

AB

Hose E

AK704692 AB

Plug

Hose E

AK704700

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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STEP 8. Check for leaks in evaporative emission hoses E 
and F.

Use a hand vacuum pump to test each hose E and F.

Q: Do the hoses hold vacuum?

YES : Go to Step 9 .
NO :  Replace any damaged hose. Then go to Step 14 .

STEP 9. Check for leaks in evaporative emission hoses G 
and H.
(1) Remove the fuel tank assembly.
(2) Use a hand vacuum pump to test each hose G and H.
Q: Do the hoses hold vacuum?

YES : Go to Step 10.
NO :  Replace any damaged hose and reinstall the fuel tank 

assembly. Then go to Step 14 .

STEP 10. Check for leaks in evaporative emission hoses I 
and J.
(1) Remove the fuel tank assembly.
(2) Use a hand vacuum pump to test each hose I and J.
Q: Do the hoses hold vacuum?

YES : Go to Step 11 .
NO :  Replace any damaged hose and reinstall the fuel tank 

assembly. Then go to Step 14  .

AK704693AB

Hose E

AK704694

AB

Hose F

AK704696

Hose G

Hose H

AB

AK704697

Hose J

Hose I

AC

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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STEP 11. 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.

(2) Connect the evaporative emission system pressure pump 

(Miller number 6872A) to the fuel filler hose.

(3) Plug the hose and the nipple shown in the illustration.

NOTE: If these items are not securely plugged now, the fuel 
could leak in the next step.

(4) Pressurize the fuel tank with the evaporative emission 

system pressure pump.

(5) In the pressurized state, check for leaks by applying a 

soapy water solution to each section and look for bubbles.

Q: Are any leaks found?

YES <When there is a leak from the attachment points of 
the fuel pump module, fuel tank differential pressure 
sensor, fuel level sensor or leveling valve.> : 

Reassemble the leaked parts and check again that 
there are no leaks. Then reinstall the fuel tank. Then 
go to Step 14 .

YES <When there is a leak from the fuel tank.> : Replace 

the fuel tank. Then go to Step 14 .

NO :  When there is no leak, reinstall the fuel tank. Then go 

to Step 13 .

AK704698

AK704701

AK704701AB