Mitsubishi Galant. Manual — part 143

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-253

STEP 7. Pressure test for evaporator line from hose B to
hose N.
(1) Disconnect hose E from the evaporative emission

ventilation solenoid side, and plug the hoses from which the
hoses have been disconnected.

(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) Connect an evaporative emission system pressure pump to

the fuel filler neck.

(4) Pressure test the system to determine whether any leaks

are present.

NOTE: "Pressure test" in this procedure refers to the I/
M240 Simulation Test (8 simple steps) described in the
evaporative emission system pressure pump (Miller number
6872A) manufacturer's instructions located in the lid of the
pump box.

Q: Are there any leaks in the evaporator line?

YES : Go to Step 8.
NO : Go to Step 21.

STEP 8. Pressure test for evaporator line from hose G to
hose N.
(1) Disconnect hose G from the evaporative emission canister

side, and plug the hose from which the pipes have been
disconnected.

(2) Perform the pressure test again.

Q: Is the pressure maintained inside the evaporator line?

YES : Go to Step 9.
NO : Go to Step 13.

STEP 9. Check for leaks in the evaporator line hose B and
hose C.
(1) The leakage test with a hand vacuum pump on each hose

from hose B and hose C.

Q: Can the leaks be pinpointed?

YES : Replace that hose. Then go to Step 34.
NO : Go to Step 10.

AC002028

HOSE E

AC

AC000186

AC002036 AC

HOSE G

AC000223

HOSE B

AC

HOSE C

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-254

STEP 10. 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: Does the vacuum pump gauge reading fluctuate?

YES : Replace the chamber, then go to Step 34.
NO : Go to Step 11.

STEP 11. Check for leaks in the evaporator line from hose
D to hose F.
(1) Remove the fuel tank. (Refer to GROUP 13C, Fuel

Tank

P.13C-6

.)

(2) The leakage test with a hand vacuum pump on each hose

from hose D to hose F.

Q: Can the leaks be pinpointed?

YES : Replace that hose, reinstall the fuel tank. Then go to

Step 34.

NO : Go to Step 12.

STEP 12. Check for leaks in the evaporative emission
canister.
(1) Connect a hand vacuum pump to the vent nipple of the

evaporative emission canister.

(2) Plug the other two nipples or loop a hose between the other

nipples.

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

that the applied vacuum does not fluctuate.

Q: Does the vacuum pump gauge reading fluctuate?

YES : Replace the evaporative emission canister, and

reinstall the fuel tank. Then go to Step 34.

NO : Reinstall the fuel tank, then go to Step 34.

AC002037AE

HOSE D

HOSE F

HOSE E

AC000191AB

VENT
NIPPLE

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L>

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STEP 13. Check for leaks in the evaporator line hose G, J,
K, L and hose M.
(1) Remove the filler neck assembly. (Refer to GROUP 13C,

Fuel tank

P.13C-6

.)

(2) Sequentially apply vacuum with a hand vacuum pump

connected to hose G, J, K, L and hose M.

Q: Can the leaks be pinpointed?

YES : Replace that hose, reinstall the filler neck assembly.

Then go to Step 34.

NO : Go to Step 14.

STEP 14. Check the check valve A.
(1) Only when you blow the check valve from the direction

shown, it should pass air.

(2) When you blow the check valve, on air should leak from the

check valve body.

Q: Is there any failure?

YES : Replace it, reinstall the filler neck assembly. Then go

to Step 34.

NO : Go to Step 15.

STEP 15. Check the check valve B.
(1) When you blow the check valve from the arrow direction

shown above, it should pass more air.

(2) When you blow the check valve from the arrow direction

shown below, it should pass less air.

(3) When you blow the check valve, on air should leak from the

check valve body.

Q: Is there any failure?

YES : Replace it, reinstall the filler neck assembly and filler

neck protector. Then go to Step 34.

NO : Go to Step 16.

AC002032

AB

HOSE G

AC

AC002039

AB

HOSE L

AC

HOSE K

HOSE M

HOSE J

AC002076 AB

CHECK VALVE A

AC002078

CHECK VALVE B

AB

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L>

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STEP 16. Check for leaks in the evaporator line from hose
H to hose I.
(1) Disconnect hose H at the liquid separator side, and then

connect a hand vacuum pump to the hose.

(2) Disconnect hose I at the fuel tank side, and then plug the

hose.

(3) Apply vacuum by using the hand vacuum pump.

Q: Is the vacuum maintained inside the evaporator line?

YES : Go to Step 17.
NO : Go to Step 20.

STEP 17. Check for leaks in the evaporator line from hose
N.
(1) Remove the fuel tank. (Refer to GROUP 13C, Fuel

Tank

P.13C-6

.)

(2) The leakage test with a hand vacuum pump on each hose

from hose N.

Q: Can the leaks be pinpointed?

YES : Replace that hose. Then go to Step 34.
NO : Go to Step 18.

AC02040 AC

HOSE H

AC002038

HOSE I

AC

AC000195

HOSE N

AD