Mitsubishi Eclipse. Manual - part 273

 

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Mitsubishi Eclipse. Manual - part 273

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-585

STEP 19. 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.13A-928

. 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 27  .

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

Replace the ECM <M/T> or PCM <A/T>. Then go to 
Step 27.

"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

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-586

STEP 20. Check for clogging in the evaporator line hose D 
to F.
(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 D to F.

Q: Are the hoses good condition?

YES : Go to Step 21.
NO :  Replace the inferior hose, reinstall the fuel tank. 

(Refer to GROUP 13C, Fuel Tank 

P.13C-13

.) Then go 

to Step 27.

STEP 21. 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 27.

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 27.

AC002037AE

HOSE D

HOSE F

HOSE E

AC000191AB

VENT
NIPPLE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-587

STEP 22. Check for clogging in the evaporator line from 
hose H to hose I.
(1) Remove the fuel tank. (Refer to GROUP 13C, Fuel Tank 

P.13C-13

.)

(2) Disconnect hose H at the liquid separator side, and then 

connect a hand vacuum pump to the hose.

(3) Unplug the hose I at the fuel tank side.
(4) Apply a pressure on the vacuum pump, air should pass 

through the hose I.

Q: Are the hoses good condition?

YES : Go to Step 23.
NO :  Replace the inferior hose, and reinstall the fuel tank. 

(Refer to GROUP 13C, Fuel Tank 

P.13C-13

.) Then go 

to Step 27.

STEP 23. Check for clogging in the evaporator line hose G, 
J, K, L and hose M.
(1) Remove the filler neck assembly. (Refer to GROUP 13C, 

Fuel Tank 

P.13C-13

.)

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

from hoses G, J, K, L and M.

Q: Are the hoses in good condition?

YES : Go to Step 24.
NO :  Replace the inferior hose, and reinstall the filler neck 

assembly. (Refer to GROUP 13C, Fuel Tank 

P.13C-13

.) Then go to Step 27.

AC02040 AC

HOSE H

AC002038

HOSE I

AC

AC002032

AB

HOSE G

AC

AC002039

AB

HOSE L

AC

HOSE K

HOSE M

HOSE J

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-588

STEP 24. Check the check valve A.
(1) Only when you blow the check valve from the direction 

shown, it should pass air.

(2) When you blow the check valve, air should leak from the 

check valve body.

Q: Is check valve A in good condition?

YES : Go to Step 25.
NO :  Replace check valve A, and reinstall the filler neck 

assembly. (Refer to GROUP 13C, Fuel Tank 

P.13C-13

.) Then go to Step 27.

STEP 25. Check the check valve B.
(1) When you blow the check valve from the arrow direction 

shown above, it should pass more air.

(2) When you blow the check valve from the arrow direction 

shown below, it should pass less air.

(3) When you blow the check valve, air should leak from the 

check valve body.

Q: Is check valve B in good condition?

YES : Go to Step 26.
NO :  Replace the check valve B, and reinstall the filler neck 

assembly. (Refer to GROUP 13C, Fuel Tank 

P.13C-13

.) Then go to Step 27.

AC002039

CHECK VALVE A

AE

AC002076 AB

CHECK VALVE A

AC002039

CHECK VALVE B

AF

AC002078

CHECK VALVE B

AB

 

 

 

 

 

 

 

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