Mitsubishi Montero (2004+). Manual — part 287

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-635

STEP 2. Check for leaks in the evaporative emission purge
solenoid.
(1) Disconnect hose B from the evaporative emission purge

solenoid and connect a hand vacuum pump to the nipple of
the evaporative emission purge solenoid.

(2) Use the hand vacuum pump to confirm that the evaporative

emission purge solenoid holds vacuum.

(3) Disconnect the hand vacuum pump and connect hose B to

the evaporative emission purge solenoid.

Q: Does the evaporative emission purge solenoid hold

vacuum?
YES : Go to Step 3.
NO : Replace the evaporative emission purge solenoid. Go

to Step 18.

STEP 3. Check for leaks in the evaporative emission
system hose A and hose B.

Perform a leakage test with a hand vacuum pump on each
hose A and B.

Q: Does the hoses hold vacuum?

YES : Go to Step 4.
NO : Replace any damaged hose. Go to Step 18.

AC203994 AB

HOSE A

HOSE B

EVAPORATIVE EMISSION

PURGE SOLENOID

AC203996

AB

EVAPORATIVE EMISSION

PURGE SOLENOID

AC203994 AB

HOSE A

HOSE B

EVAPORATIVE EMISSION

PURGE SOLENOID

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-636

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

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-637

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

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-638

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