Mitsubishi Montero (2004+). Manual — part 261

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-531

STEP 4. Check the evaporative emission ventilation
solenoid using scan tool MB991958 (Actuator test item 29).

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) Disconnect hose S from the evaporative emission

ventilation solenoid and connect a hand vacuum pump.

(3) Turn the ignition switch to the "ON" position.
(4) Set scan tool MB991958 to actuator test mode.

Item 29: Evaporative Emission Ventilation Solenoid Valve.

While the evaporative emission ventilation solenoid is
energized, operate the hand vacuum pump and confirm
that solenoid holds vacuum.

• While the evaporative emission ventilation solenoid

is energized, operate the hand vacuum pump and
confirm that solenoid holds vacuum.

(5) Turn the ignition switch to the "LOCK" (OFF) position and

disconnect scan tool MB991958.

(6) Disconnect the hand vacuum pump and connect hose S to

the evaporative emission ventilation solenoid.

Q: Does the evaporative emission ventilation solenoid hold

vacuum?
YES : Go to Step 5.
NO : Replace the evaporative emission ventilation

solenoid. (Refer to GROUP 17, Evaporative Emission
Canister and Fuel Tank Pressure Relief Valve

P.17-72

). Go to Step 18.

AC306409AF

MB991911

MB991824

MB991827

AC101769

HOSE S

AC

EVAPORATIVE EMISSION

VENTILATION SOLENOID

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-532

STEP 5. Check for leaks in the evaporative emission
system hose S.

Perform a leakage test with a hand vacuum pump on hose
S.

Q: Does hose S hold vacuum?

YES : Go to Step 6.
NO : Replace hose S. Go to Step 18.

STEP 6. Check for leaks in the evaporative emission
system hose E.

Perform a leakage test with a hand vacuum pump on hose
E.

Q: Does hose E hold vacuum?

YES : Go to Step 7.
NO : Replace hose E. Go to Step 18.

AC102452

HOSE S

AC

OVER VENT

VALVE

MODULE

AC101772

HOSE E

AC

EVAPORATIVE EMISSION

CANISTER

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-533

STEP 7. Pressure test the 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) 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) Disconnect the evaporative emission system pressure

pump and reinstall the fuel cap.

(7) Connect hose F to the evaporative emission canister.
Q: Is the evaporative emission system line free of leaks?

YES : Go to Step 15.
NO : Go to Step 8.

STEP 8. Check for leaks in the evaporator line hose F.
(1) Remove the fuel tank filler tube protector. (Refer to GROUP

13B, Fuel Tank

P.13B-8

).

(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 and confirm that

the vacuum holds.

(5) Disconnect the hand vacuum pump and connect hose F

and G.

Q: Does hose F hold vacuum?

YES : Go to Step 9.
NO : Replace hose F and reinstall the fuel tank filler tube

protector. (Refer to GROUP 13B, Fuel Tank

P.13B-8

).

Go to Step 18.

AC102602 AC

HOSE F

ACX01358

AC101767 AC

HOSE F

HOSE G

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-534

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-8

).

(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-8

). Go to

Step 18.

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-8

). Go to Step 18.

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