Mitsubishi Eclipse. Manual — part 550

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-743

(2) Connect an evaporative emission system pressure pump to

the leveling valve nipple.

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

nipple connected to the fuel tank.
NOTE: If these items are not securely plugged here, the
fuel could leak in the next step.

(4) Apply pressure with the evaporative emission system

pressure pump.

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

water, etc. to each section.

Q: Are there any leaks?

There are leaks at the fuel pump module or the fuel tank
differential pressure sensor section. : After reassemble

the leaked parts, check again that there are no leaks.
Then reinstall the fuel tank. (Refer to GROUP 13C,
Fuel Tank

P.13C-13

.) Then go to Step 26.

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

reinstall the fuel tank. (Refer to GROUP 13C, Fuel
Tank

P.13C-13

.) Then go to Step 26.

There are no leaks. : Then go to Step 15.

STEP 15. Visually check for cracks in the fuel tank filler
neck.
(1) Visually check for cracks in the fuel tank filler neck.
Q: Is the fuel filler neck assembly in good condition?

YES : Reinstall the fuel tank and fuel filler neck assembly.

(Refer to GROUP 13C, Fuel Tank

P.13C-13

.) Then go

to Step 26.

NO : Replace the fuel tank filler neck assembly and

reinstall the fuel tank. (Refer to GROUP 13C, Fuel
Tank

P.13C-13

.) Then go to Step 26.

AC000197

AC000198

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-744

STEP16. Pressure test for clogging in the evaporator line
from hose I to hose P.
(1) Disconnect hose I from the evaporative emission canister

side, and unplug the hose I.

(2) On the EVAP pressure pump, set the pressure/hold valve to

OPEN, and set the vent valve to CLOSED. Turn the pump
timer to ON. You can reset the timer as required. (These
settings are listed under "Leak Test" in the pump
instructions.)

(3) Air should pass through hose G.
Q: Is air blown from hose I?

YES : Connect the hose I. Then go to Step 17.
NO : Go to Step 21.

STEP17. Pressure test for clogging in the evaporator line
from hose F to hose H.
(1) Unplug hose G.
(2) On the EVAP pressure pump, set the pressure/hold valve to

OPEN, and set the vent valve to CLOSED. Turn the pump
timer to ON. You can reset the timer as required. (These
settings are listed under "Leak Test" in the pump
instructions.)

(3) Air should pass through hose G.
Q: Is air blown from hose G?

YES : Connect the hose G. Then go to Step 18.
NO : Go to Step 19.

AC002072 AB

HOSE I

OPEN

OPEN

CLOSED

CLOSED

Pressure
Hold

Vent

ACX01806

OPEN

OPEN

CLOSED

CLOSED

Pressure
Hold

Vent

ACX01806

AC002029

HOSE E

AC

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-745

STEP 18. Using scan tool MB991958, check evaporative
emission system monitor test.

CAUTION

• To prevent damage to scan tool MB991958, always turn

the ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991958.

• With this monitor, the ECM <M/T> or PCM <A/T> auto-

matically increases the engine speed to 1,600 r/min or
more. Check that the transaxle is set to "neutral" <M/T>
or "P" <A/T> position.

(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Erase the DTCs using scan tool MB991958.
(4) Check that the fuel cap is securely closed. (Tighten until

three clicks are heard.)

(5) Start the engine.
(6) Select "System Test," and press the "YES" key.
(7) Select "Evap Leak Mon," and press the "YES" key.
(8) During the monitor, keep the accelerator pedal at the idling

position.
NOTE: If the engine speed does not reach 2,000 r/min dur-
ing the monitor test, adjustment of the Speed Adjusting
Screw may be needed. Refer to

P.13B-1105

. And adjust to

the standard value.

(9) Keep the engine speed and engine load within the specified

range. When the monitor test starts, the "In Progress" item
on the scan tool MB991958 will change from "NO" to "YES."

(10)Turn the ignition switch to the "LOCK" (OFF) position. Then

disconnect scan tool MB991958.

Q: What is displayed on scan tool MB991958?

"Evap Leak Mon. Completed. Test Passed" : The

evaporative emission system is working properly at
this time. Then go to Step 26 .

"Evap Leak Mon. Completed. Test Failed and DTCs Set"
:

Replace the ECM <M/T> or PCM <A/T>. Then go to
Step 26.

"Evap Lead Mon. discontinued. Retest again from the
first" : The monitor was discontinued for a certain reason

(vehicle speed input from ECM <M/T> or PCM <A/T>,
engine speed and engine load deviating from
specified range). Turn the ignition switch to the
"LOCK" (OFF) position once, and recheck
evaporative emission system monitor test.

AC303127

AB

MB991911

16-PIN

MB991827

MB991824

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-746

STEP 19. Check for clogging in the evaporator line hose F
to H.
(1) Remove the fuel tank. (Refer to GROUP 13C, Fuel Tank

P.13C-13

.)

(2) The clogging test with a hand vacuum pump on each hose

from hose F to H.

Q: Are the hoses good condition?

YES : Go to Step 20.
NO : Replace the inferior hose, reinstall the fuel tank.

(Refer to GROUP 13C, Fuel Tank

P.13C-13

.) Then go

to Step 26.

STEP 20. Check for clogging in the evaporative emission
canister.
(1) Connect a hand vacuum pump to the vent nipple of the

evaporative emission canister.

(2) Plug the other two nipples or loop a hose between the other

nipples.

(3) Apply a pressure on the vacuum pump.
(4) When each nipple is unplugged, air should pass through the

unplugged nipple.

Q: Is the evaporative emission canister in good condition?

YES : Reinstall the fuel tank. (Refer to GROUP 13C, Fuel

Tank

P.13C-13

.) Then go to Step 26.

NO : Replace the evaporative emission canister (Refer to

GROUP 17, Evaporative Emission Canister and Fuel
Tank Pressure Relief Valve

P.17-117

,) and reinstall

the fuel tank. (Refer to GROUP 13C, Fuel Tank

P.13C-13

.) Then go to Step 26.

AC002037

HOSE F

HOSE H

AB

HOSE G

AC000191AB

VENT
NIPPLE