Mitsubishi Montero (2002-2004). Manual — part 698

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-489

STEP 9. Check for leaks in the evaporative emission
system hoses G through N.
(1) Remove the fuel tank filler tube. (Refer to GROUP 13B,

Fuel Tank

P.13B-11

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

hose from hose G to N.

Q: Does the hoses hold vacuum?

YES : Go to Step 10.
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

P.13B-11

). Go to

Step 26.

STEP 10. 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 11.
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

P.13B-11

). Go to Step 26.

AC102673 AC

HOSE G

HOSE L

HOSE M

HOSE N

AC102646 AC

HOSE K

HOSE I

HOSE H

HOSE J

AC102646 AD

CHECK
VALVE A

AC002076 AB

CHECK VALVE A

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DIAGNOSTIC TROUBLE CODE PROCEDURES

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STEP 11. 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 12.
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

P.13B-11

). Go to Step 26.

STEP 12.Check for cracks in the fuel tank filler tube
assembly.

Visually check for cracks in the fuel tank filler tube
assembly.

Q: Is the fuel tank filler tube assembly in good condition?

YES : Go to Step 13.
NO : Replace the fuel tank filler tube assembly and reinstall

the fuel tank filler tube protector. (Refer to GROUP
13B, Fuel Tank

P.13B-11

). Go to Step 26 .

AC102646 AE

CHECK
VALVE B

AC002078

CHECK VALVE B

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DIAGNOSTIC TROUBLE CODE PROCEDURES

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STEP 13. Check for leaks in the evaporative emission
system hoses O through R.
(1) Remove the fuel tank. (Refer to GROUP 13B, Fuel Tank

P.13B-11

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

hose from hose O to R.

Q: Does the hoses hold vacuum?

YES : Go to Step 14.
NO : Replace any damaged hose, and reinstall the fuel

tank, the fuel tank filler tube and the fuel tank filler
tube protector. (Refer to GROUP 13B, Fuel Tank

P.13B-11

). Go to Step 26.

STEP 14. Check for leaks in the fuel tank.
(1) Visually check for cracks and leaks, etc.

NOTE: Carefully check the fuel pump assembly, the fuel
level sensor, the fuel tank rollover valve and fuel tank level-
ing valve installation section in the fuel tank.

AC101748

HOSE P

HOSE R

HOSE O

ACX01353 AC

HOSE Q

ACX01357

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DIAGNOSTIC TROUBLE CODE PROCEDURES

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(2) Connect the evaporative emission system pressure pump

to the filler hose.

(3) Plug the filler hose, feed pipe, return pipe and rollover valve

nipple that are connected to the fuel tank.
NOTE: If these items are not securely plugged at this time,
the fuel could leak from the tank.

(4) Pressurize the fuel tank with the evaporative emission

system pressure pump.

(5) In the pressurized state, check for the leaks by applying

soapy water solution to each section and look for bubbles.

Q: Is the fuel tank free of leaks?

There are leaks at the fuel pump assembly, the fuel level
sensor, the fuel tank rollover valve or the fuel tank
leveling valve installation section. : After reassemble the

leaked parts, check again that there are no leaks.
Reinstall the fuel tank, the fuel tank filler tube and the
fuel tank filler tube protector. (Refer to GROUP 13B,
Fuel Tank

P.13B-11

). Go to Step 26.

There are leaks at the fuel tank. : Replace the fuel tank,

and reinstall the fuel tank filler tube and the fuel tank
filler tube protector. (Refer to GROUP 13B, Fuel Tank

P.13B-11

). Go to Step 26.

There are no leaks. : Reinstall the fuel tank, the fuel tank

filler tube and the fuel tank filler tube protector. (Refer
to GROUP 13B, Fuel Tank

P.13B-11

). Go to Step 25 .

STEP 15. Check for leaks in the evaporative emission
system hose C and hose D.
(1) Remove the fuel tank. (Refer to GROUP 13B, Fuel Tank

P.13B-11