Mitsubishi Montero (2004+). Manual — part 284
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-623
STEP 16. Check for leaks in the evaporative emission
canister.
(1) Remove the evaporative emission canister. (Refer to
GROUP 17, Evaporative Emission Canister and Fuel Tank
Pressure Relief Valve
(2) Connect a hand vacuum pump to the vent nipple of the
evaporative emission canister.
(3) Plug the other two nipples or loop a hose between them.
(4) Apply vacuum with the hand vacuum pump and confirm that
the canister holds vacuum.
Q: Does the evaporative emission canister hold vacuum?
YES : Reinstall the evaporative emission canister. (Refer to
GROUP 17, Evaporative Emission Canister and Fuel
Tank Pressure Relief Valve
). Go to Step 17
.
NO : Replace the evaporative emission canister. (Refer to
GROUP 17, Evaporative Emission Canister and Fuel
Tank Pressure Relief Valve
). Go to Step 26
.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-624
STEP 17. Pressure test for clogging in evaporative
emission system lines between hose F and R.
(1) Disconnect hose F from the evaporative emission canister
and plug hose F securely.
(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) Remove the fuel cap.
(4) Connect the evaporative emission system pressure pump
to the fuel tank filler tube.
(5) After it is confirmed that pressure maintained, unplug hose
F.
(6) Disconnect the evaporative emission system pressure
pump and reinstall the fuel cap.
(7) Connect hose F to the evaporative emission canister.
Q: Does hose F blow the air?
YES : Go to Step 23.
NO : Go to Step 18.
AC102602 AC
HOSE F
ACX01358
AC102548
HOSE F
AC
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-625
STEP 18. Check for clogging in the evaporator line hose F.
(1) Remove the fuel tank filler tube protector. (Refer to GROUP
13B, Fuel Tank
(2) Disconnect hose F from the evaporative emission canister
and plug hose F securely.
(3) Disconnect hose G from the evaporative emission canister
side, and connect a hand vacuum pump.
(4) Apply vacuum with the hand vacuum pump, unplug hose F.
(5) Disconnect the hand vacuum pump and connect hose F
and G.
Q: Does hose F blow the air?
YES : Go to Step 19.
NO : Replace hose F and reinstall the fuel tank filler tube
protector. (Refer to GROUP 13B, Fuel Tank
).
Go to Step 26.
STEP 19. Check for clogging in the evaporative emission
system hoses G through N.
(1) Remove the fuel tank filler tube. (Refer to GROUP 13B,
Fuel Tank
(2) Use a hand vacuum pump to clogging test on each hose
from hose G to hose N.
Q: Are the hoses in good condition?
YES : Go to Step 20.
NO : Replace any damaged hose, and reinstall the fuel
tank filler tube and the fuel tank filler tube protector.
(Refer to GROUP 13B, Fuel Tank
). Go to
Step 26.
AC101767 AC
HOSE F
HOSE G
AC102548
HOSE F
AC
AC102673 AC
HOSE G
HOSE L
HOSE M
HOSE N
AC102646 AC
HOSE K
HOSE I
HOSE H
HOSE J
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-626
STEP 20. Check the check valve A.
(1) Check valve A is a one-way check valve.
(2) Check valve A should allow air to flow in only one direction.
Q: Does check valve A allow air to press in one direction
only?
YES : Go to Step 21.
NO : Replace check valve A, and reinstall the fuel tank filler
tube and the fuel tank filler tube protector. (Refer to
GROUP 13B, Fuel Tank
). Go to Step 26.
STEP 21. Check the check valve B.
(1) Check valve B is a one-way check valve.
(2) Check valve B should allow air to flow in only one direction.
Q: Does check valve B allow air to press in one direction
only?
YES : Go to Step 22.
NO : Replace check valve B, and reinstall the fuel tank filler
tube and the fuel tank filler tube protector. (Refer to
GROUP 13B, Fuel Tank
). Go to Step 26.
AC102646 AD
CHECK
VALVE A
AC002076 AB
CHECK VALVE A
AC102646 AE
CHECK
VALVE B
AC002078
CHECK VALVE B
AB
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