Mitsubishi Galant. Manual — part 262

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-273

STEP 3. Check the evaporative emission ventilation
solenoid valve using the scan tool MB991502. (Actuator
test item 29.)
(1) Turn the ignition switch to the the "ON" position, and

disconnect the hose G from the evaporative emission
ventilation solenoid side.

(2) Connect the hand vacuum pump to the nipple of the

evaporative emission ventilation solenoid from which the
hoses have been disconnected.

(3) Drive the evaporative emission ventilation solenoid with the

scan tool MB991502 actuator test, and confirm that the
vacuum does not fluctuate when the vacuum is applied with
the hand vacuum pump.

Q: Does the vacuum pump gauge indicate the atmosheric

pressure when the evaporative emission purge solenoid
is activated?
The evaporative emission purge solenoid valveoperates
normally, and the vacuum pump gauge reading returns
to the atmospheric pressure : Go to Step 1.
The evaporative emission purge solenoid valve
operates normally, but the vacuum pump gauge does
not indicate the atmospheric pressure : Replace the

evaporative emission purge solenoid. Then go to Step
1.

The evaporative emission purge solenoid valve does
not operate normally : Refer to

P.13B-286

, evaporative

emission purge solenoid trouble code DTC P0446.

STEP 4. Pressure test for evaporator line from hose I to
hose P.
(1) Disconnect hose I from the evaporative emission canister

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

(2) Perform the pressure test again.

Q: Are there any leaks in the evaporator line?

YES : Go to Step 8.
NO : Go to Step 5.

AC002030 AB

HOSE G

EVAPORATIVE EMISSION

VENTILATION SOLENOID

AC002031AB

EVAPORATIVE EMISSION

VENTILATION SOLENOID

AC002036 AB

HOSE I

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-274

STEP 5. Check for leaks in the evaporator line hose C to
hose E.
(1) The leakage test with a hand vacuum pump on each hose

from hose C to hose E.

Q: Can the leaks be pinpointed?

YES : Replace the hose. Then go to Step 1.
NO : Go to Step 6.

STEP 6. Check for leaks in the evaporator line from hose F
to hose H.
(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 F to hose H.

Q: Can the leaks be pinpointed?

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

Step 1.

NO : Go to Step 7.

STEP 7. 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 reading fluctuate?

YES : Replace the evaporative emission canister, reinstall

the fuel tank. Then go to Step 1.

NO : Go to Step 1.

AC002074

HOSE C

AC

AC002284 AB

HOSE D

HOSE E

AC002037

HOSE F

HOSE H

AB

HOSE G

AC000191AB

VENT
NIPPLE

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-275

STEP 8. Check for leaks in the evaporator line hose I, L,M
and O.
(1) Remove the fuel tank filler neck assembly. (Refer to

GROUP 13C, Fuel Tank

P.13C-6

.)

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

from hose I, L, M, N and O.

Q: Can the leaks be pinpointed?

YES : Replace the hose, reinstall the fuel tank filler neck

assembly. Then go to Step 1.

NO : Go to Step 9.

STEP 9. 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 1.

NO : Go to Step 10.

STEP 10. 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 1.

NO : Go to Step 11.

AC002032

AB

HOSE I

AB

AC002039

AB

AB

HOSE O

HOSE L

HOSE N

HOSE M

AC002076 AB

CHECK VALVE A

AC002078

CHECK VALVE B

AB

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-276

STEP 11. Check for leaks in the evaporator line from hose
J to hose K.
(1) Disconnect hose J at the liquid separator, and then connect

a hand vacuum pump to the hose.

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

hose.

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

Q: Is the pressure maintained in the evaporator line?

YES : Go to Step 12.
NO : Go to Step 15.

STEP 12. Check for leaks in the evaporator line from hose
P.
(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 P.

Q: Can the leaks be pinpointed?

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

Step 1.

NO : Go to Step 13.

AC02040 AB

HOSE J

AC002038 AB

HOSE K

AC000195AB

HOSE P