Mitsubishi Galant 9G. Manual — part 1095
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-680
STEP 4. 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: Is the chamber in good condition?
YES : Go to Step 5.
NO : Replace the chamber. Then go to Step 15.
STEP 5. Check for leaks in evaporative emission hoses E
through G.
Use a hand vacuum pump to test each hose from hose E to
hose G.
Q: Do the hoses hold vacuum?
YES : Go to Step 6.
NO : Replace any damaged hose. Then go to Step 15.
AC306388
AC306389AC
CHAMBER
AC306710
HOSE E
AC
AC306401
HOSE G
HOSE F
AD
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-681
STEP 6. Using scan tool MB991958, check data list item 29:
Evaporative emission ventilation solenoid.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Remove the fuel tank filler tube protector (Refer to GROUP
).
(3) Disconnect the hose G and evaporative emission canister
connection, and connect the hand vacuum pump to the
hose G.
(4) Turn the ignition switch to the "ON" position.
(5) Set scan tool MB991958 to actuator test mode.
• Item 29: 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, and
disconnect scan tool MB991958.
(7) Disconnect the hand vacuum pump, and connect hose G to
the evaporative emission canister.
(8) Reinstall the fuel tank filler tube protector (Refer to GROUP
).
Q: Did the evaporative emission ventilation solenoid hold
vacuum?
YES : Go to Step 7.
NO : Replace the evaporative emission ventilation solenoid
(Refer to GROUP 17, Evaporative emission canister
and fuel tank pressure relief valve removal and
installation
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC306777
AC
HOSE G
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-682
STEP 7. Pressure test the evaporative emission system
lines from hoses H to M.
(1) Disconnect hose H from the evaporative emission canister,
and plug hose H securely.
(2) 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.
(3) Remove the fuel cap.
(4) Connect the evaporative emission system pressure pump
(Miller number 6872A) to the fuel tank filler tube by using
fuel tank adapter (MLR-8382).
(5) 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.
(6) Remove the evaporative emission system pressure pump
(Miller number 6872A) and the fuel tank adapter
(MLR-8382), and reinstall the fuel cap.
(7) Connect hose H to the evaporative emission canister.
Q: Is the evaporative emission system line free of leaks?
YES : Go to Step 13.
NO : Go to Step 8.
AC306778
AC
HOSE H
PLUG
AC306661
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-683
STEP 8. Check for leaks in evaporative emission hoses H
through J.
(1) Remove the fuel tank filler tube protector (Refer to GROUP
).
(2) Use a hand vacuum pump to test each hose from hose H to
hose J.
Q: Do the hoses hold vacuum?
YES : Go to Step 9.
NO : Replace any damaged hose. Then go to Step 15.
STEP 9. Test check valve.
(1) Check valve is a one-way check valve.
(2) Check valve should allow air to flow in only one direction.
Q: Does check valve allow air to pass in one direction
only?
YES : Go to Step 10.
NO : Replace check valve, and reinstall the fuel tank filler
tube protector (Refer to GROUP 13C, Fuel Tank
AC306401
HOSE H
AE
AC306800
AC
HOSE I
HOSE J
AC306800
AD
CHECK VALVE
AC306332
AB
CHECK VALVE
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