Mitsubishi Galant. Manual — part 144
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-257
STEP 18. Check for leaks in the fuel tank.
(1) Visually check for cracks and leaks, etc.
NOTE: Carefully check the fuel pump assembly and the
inner pressure sensor installation section in the fuel tank.
(2) Connect an evaporative emission system pressure pump to
the leveling valve nipple.
(3) Plug the filler hose, feed pipe, return pipe and rollover valve
nipple connected to the fuel tank.
NOTE: If these items are not securely plugged here, the
fuel could leak in the next step.
(4) Apply pressure with the evaporative emission system
pressure pump.
(5) In the pressurized state, check for the leak by applying soap
water, etc. to each section.
Q: Can the leaks be pinpointed?
There is leaks at the fuel pump assembly or the inner
pressure sensor installation section : Reassemble the
parts, check again that there are no leaks, reinstall
the fuel tank. Then go to Step 34.
There is leaks at another section : Go to Step 19.
STEP 19. Visually check for cracks in the fuel tank filler
neck.
(1) Visually check for cracks in the fuel tank filler neck.
Q: Can the leaks be found out?
YES : Replace the fuel tank filler neck assembly and
reinstall the fuel tank. Then go to Step 34.
NO : Reinstall the fuel tank.Then go to Step 34.
AC000196
AC000197
AC000198
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-258
STEP 20. Check for leaks in the evaporator line from hose
H to hose I.
(1) The leakage test with a hand vacuum pump on each hose
from hose H to hose I.
Q: Can the leaks be pin pointed?
YES : Replace that hose, and go to Step 34.
NO : Go to Step 34.
STEP 21. Check for clogging in the evaporator line from
hose E to hose G.
(1) Unplug hose E.
(2) On the EVAP pressure pump, set the pressure/hold valve to
OPEN, and set the vent valve to CLOSED. Turn the pump
timer to ON. You can reset the timer as required. (These
settings are listed under "Leak Test" in the pump
instructions.)
(3) Air should pass through hose E.
Q: Does air pass through hose E?
YES : Go to Step 25.
NO : Go to Step 22.
AC002033 AD
HOSE H
HOSE I
OPEN
OPEN
CLOSED
CLOSED
Pressure
Hold
Vent
ACX01806
AC002029
HOSE E
AC
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-259
STEP 22. Check for clogging in the evaporator line from
hose G to hose N.
(1) Disconnect hose G from the evaporative emission canister
side, and unplug the hose G.
(2) On the EVAP pressure pump, set the pressure/hold valve to
OPEN, and set the vent valve to CLOSED. Turn the pump
timer to ON. You can reset the timer as required. (These
settings are listed under "Leak Test" in the pump
instructions.)
(3) Air should pass through hose G.
Q: Does air pass through hose G?
YES : Go to Step 23.
NO : Go to Step 29.
STEP 23. Check for clogging in the evaporator line from
hose E and hose F.
(1) Remove the fuel tank. (Refer to GROUP 13C, Fuel
Tank
(2) The clogging test with a hand vacuum pump on each hose
from hose E and hose F.
Q: Are there any clogs?
YES : Replace that hose, and perform the OBD-II drive
cycle
NO : Go to Step 24.
AC002036 AC
HOSE G
OPEN
OPEN
CLOSED
CLOSED
Pressure
Hold
Vent
ACX01806
AC002037
HOSE E
HOSE F
AF
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-260
STEP 24. 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 34.
NO : Replace the evaporative emission canister, reinstall
the fuel tank. Then perform the OBD-II drive
cycle
STEP 25. Check for clogging in the evaporator line hose D.
(1) Disconnect hose D at the intake manifold side, and then
connect a hand vacuum pump to hose D 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 26.
NO : Go to Step 28.
STEP 26. Check for clogging in the evaporator line hose B
to hose C.
(1) The clogging test with a hand vacuum pump on each hose
from hose B to hose C.
Q: Are there any clogs?
YES : Replace that hose, and perform the purge flow check.
(Refer to GROUP 17, Purge Control System
Check
.)
NO : Go to step 27.
STEP 27. Check for clogging in the chamber.
(1) Connect a hand vacuum pump to the nipple.
(2) Plug the other nipple.
(3) Apply vacuum. When the nipple is unplugged, the vacuum
should fluctuate.
Q: Does the vacuum pump gauge reading fluctuates?
YES : Go to Step 34.
NO : Replace the chamber, and perform OBD-II drive
cycle
AC000191AB
VENT
NIPPLE
AC000227
HOSE D
AC
AC000223
HOSE B
AC
HOSE C
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