Mitsubishi Galant. Manual — part 277

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-333

STEP 23. Check for clogging 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, when each nipple is unplugged, the

vacuum should fluctuate.

Q: Does the vacuum pump gauge reading fluctuate?

YES : Reinstall the fuel tank. Then go to step 32.
NO : Replace the evaporative emission canister, reinstall

the fuel tank. Then perform the OBD-II drive
cycle

P.13B-4

.

STEP 24. Check for clogging in the evaporator line hose F.
(1) Disconnect hose F at the intake manifold side, and then

connect a hand vacuum pump to hose F at the floor pipe
side.

(2) Apply vacuum.

NOTE: The vacuum should be 40 kPa (5.8 psi) or less.

(3) Use scan tool MB991502 to activate the evaporative

emission purge solenoid valve. The vacuum should leak.

Q: Is the vacuum maintained inside the evaporator line?

YES : Go to Step 25.
NO : Go to Step 26.

STEP 25. Check for clogging in the evaporator line hose C
to hose E.
(1) The clogging test with a hand vacuum pump on each hose

from hose C to hose E.

Q: Are there any clogs?

YES : Replace that hose, and perform the purgeflow check.

(Refer to GROUP 17, Purge Control System
Check

P.17-85

.)

NO : perform the OBD-II drive cycle

P.13B-4

.

AC000191AB

VENT
NIPPLE

AC000227

HOSE F

AB

AC002074

HOSE C

AC

AC002284 AB

HOSE D

HOSE E

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-334

STEP 26. Check for clogging in the evaporator line from
hose F.
(1) Remove the fuel tank. (Refer to GROUP 13C, Fuel

Tank

P.13C-6

.)

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

from hose F.

Q: Are there any clogs?

YES : Replace that hose, and perform the OBD-II drive

cycle

P.13B-4

.

NO : Go to Step 27.

STEP 27. Check for clogging in the evaporator line hose I,
L, M, N and hose O.
(1) Remove the filler neck assembly. (Refer to GROUP 13C,

Fuel tank

P.13C-6

.)

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

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

Q: Are there any clogs?

YES : Replace that hose, reinstall the filler neck assembly

and filler neck protector, and perform the OBD-II drive
cycle

P.13B-4

.

NO : Go to Step 28.

AC002037AH

HOSE F

AC002032

AB

HOSE I

AB

AC002039

AB

AB

HOSE O

HOSE L

HOSE N

HOSE M

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-335

STEP 28. 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, then perform the OBD-II drive cycle

P.13B-

4

.

NO : Go to Step 29.

STEP 29. 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, then perform the OBD-II drive cycle

P.13B-

4

.

NO : Go to Step 30.

STEP 30. Check for clogging in the evaporator line from
hose J to hose K.
(1) The clogging test with a hand vacuum pump on each hose

from hose J to hose K.

Q: Are there any clogs?

YES : Replace that hose, reinstall the filler neck assembly

and filler neck protector, and perform the OBD-II drive
cycle

P.13B-4

.

NO : Go to Step 31.

AC002076 AB

CHECK VALVE A

AC002078

CHECK VALVE B

AB

AC002033 AB

HOSE K

HOSE J

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-336

STEP 31. Check for clogging in the evaporator line from
hose P.
(1) Remove the filler neck assembly. (Refer to GROUP 13C,

Fuel tank

P.13C-6

.)

(2) Carry out the clogging test with a hand vacuum pump on

each hose from hose P.

Q: Is there any clogs?

YES : Replace that hose, reinstall the fuel tank, and perform

the OBD-II drive cycle

P.13B-4

.

NO : Go to step 32.

STEP 32. Evaporative Emission System Monitor Test using
scan tool MB991502.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the DTCs using the scan tool MB991502.
(3) Check that the fuel cap is securely closed. (Tighten until

three clicks are heard.)

(4) Start the engine.
(5) Select "System Test," and press the "YES" key.
(6) Select "Evap Leak Mon," and press the "YES" key.
(7) During the monitor, keep the accelerator pedal at the idling

position.

NOTE: If the engine speed does not reach 2,000 r/min
during the monitor test, adjustment of the Speed Adjusting
Screw may be needed. Refer to

P.13B-521

. and adjust to

the standard value.

(8) Keep the engine speed and engine load within the specified

range. When the monitor test starts, the "In Progress" item
on the scan tool MB991502 will change from "NO" to "YES."

Q: What kind of message is displayed on scan tool

MB991502?
When the message "Evap Leak Mon. Completed. Test
Passed" is displayed : The evaporative emission system

is working properly at this time. Explain to customer
that improperly tightened fuel cap can cause MIL to
turn on, and return the vehicle.

When the message "Evap Leak Mon. Completed. Test
Failed and DTCs Set" is displayed : Go to Step 1 .
When the message "Evap Lead Mon. discontinued.
Retest again from the first" is displayed : Turn the

ignition switch to the "LOCK" (OFF) position once,
then repeat this monitor test from the start.

AC000195 AC

HOSE P

AC003081 AB

16 PIN

MB991502