Mitsubishi Outlander GS45X. Manual - part 905

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-553

STEP 8. Check for leaks in evaporative emission hose F 
and G.
(1) Remove the fuel tank assembly (Refer to GROUP 13C, 

Fuel Tank <FWD> 

P.13C-15

 or Fuel Tank <AWD> 

P.13C-20

).

(2) Use a hand vacuum pump to test each hose F and G.
Q: Do the hose hold vacuum?

YES : Go to Step 9 .
NO :  Replace any damaged hose. Then go to Step 12 .

STEP 9. Check for leaks in the fuel tank.
(1) Visually check for cracks or other leaks in the fuel tank.

NOTE: Carefully check the fuel pump module and the fuel 
tank differential pressure sensor installation in the fuel tank.

AK704167

Hose F

Hose G

AC

AK704168

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-554

(2) Connect the evaporative emission system pressure pump 

(Miller number 6872A) to the fuel filler hose.

(3) Plug the hose and the nipple shown in the illustration.

NOTE: If these items are not securely plugged now, the fuel 
could leak in the next step.

(4) Pressurize the fuel tank with the evaporative emission 

system pressure pump.

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

soapy water solution to each section and look for bubbles.

Q: Are any leaks found?

YES <When there is a leak from the attachment points of 
the fuel pump module, fuel tank differential pressure 
sensor, fuel level sensor (sub) or leveling valve.> : 

Repair or replace the leaked parts and check again 
that there are no leaks. Then reinstall the fuel tank 
(Refer to GROUP 13C, Fuel Tank <FWD> 

P.13C-15

 

or Fuel Tank <AWD> 

P.13C-20

). Then go to Step 12 .

YES <When there is a leak from the fuel tank.> : Replace 

the fuel tank (Refer to GROUP 13C, Fuel Tank 
<FWD> 

P.13C-15

 or Fuel Tank <AWD> 

P.13C-20

). 

Go to Step 12 

NO :  When there is no leak, reinstall the fuel tank (Refer to 

GROUP 13C, Fuel Tank <FWD> 

P.13C-15

 or Fuel 

Tank <AWD> 

P.13C-20

). Then go to Step 12 .

STEP 10. Check the evaporative emission canister for 
vacuum leaks.
(1) Connect a hand vacuum pump to the evaporative emission 

canister and plug the other nipples.

(2) Apply a pressure on the hand vacuum pump, and confirm 

that air is maintained.

(3) Disconnect the hand vacuum pump and remove the plugs.
Q: Is the evaporative emission canister in good condition?

YES : Go to Step 11 .
NO :  Replace the evaporative emission canister (Refer to 

GROUP 17, Evaporative emission canister and fuel 
tank pressure relief valve removal and installation 

P.17-87

). Then go to Step 12 .

AK704169

AK704170AC

AK704171

Plugs

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-555

STEP 11. Using scan tool MB991958, check the 
evaporative emission system monitor test.

CAUTION

• During this test, the ECM automatically increases the 

engine speed to 1,600 r/min or greater. Check that the 
transaxle is set to "P" position.

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

three clicks are heard).

(4) Start the engine.
(5) Select "System Test."
(6) Select "Evap Leak Mon."
(7) During the test, keep the accelerator pedal at the idle 

position.

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

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

(9) Turn the ignition switch to the "LOCK" (OFF) position. 
Q: Is "Evap Leak Mon. Completed. Test Failed and DTCs 

Set" displayed on scan tool MB991958?
YES : Replace the ECM. When the ECM is replaced, 

register the ID code. Refer to GROUP 42B, Diagnosis 
− ID Code Registration Judgment Table <Vehicles 

with KOS> 

P.42B-15

 or GROUP 42C, Diagnosis 

− ID 

Code Registration Judgment Table <Vehicles with 
WCM> 

P.42C-10

. Then go to Step 12 .

NO <"Evap Leak Mon. Completed. Test Passed" is 
displayed on scan tool MB991958.> : The evaporative 

emission system is working properly at this time. Go 
to Step 12  .

NO <"Evap Leak Mon. Discontinued. Retest again from 
the first" is displayed on scan tool MB991958.> : The 

EVAP monitor has been interrupted during the test. 
Turn the ignition switch to the "LOCK" (OFF) position 
once, and repeat the monitoring from Step 11 .

STEP 12. Perform the OBD-II drive cycle.
(1) Confirm the repair by performing the appropriate drive cycle 

(Refer to Diagnostic Function 

− OBD-ll Drive Cycle − 

Pattern 6 

P.13B-11

).

(2) Read the DTC.
Q: Is DTC P0456 set?

YES : Repeat the troubleshooting.
NO :  The procedure is complete.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-556

DTC P0461: Fuel Level Sensor <FWD> or Fuel Level Sensor (main) <AWD> Circuit 
Range/Performance

.

TECHNICAL DESCRIPTION

• The fuel level sensor converts the rest of the fuel 

to a voltage and seconds it to the combination 
meter.

• The combination meter sends the data regarding 

the rest of the fuel to the ECM.

• The ECM checks whether this data is within a 

specified range.

.

DESCRIPTIONS OF MONITOR METHODS

Detect malfunction if change of fuel level sensor out-

put voltage is small when sum of fuel injection is 
large.

.

MONITOR EXECUTION

Continuous

.

MONITOR EXECUTION CONDITIONS 
(Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.