Mitsubishi Lancer Evolution X. Manual - part 339

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-421

STEP 3. Using scan tool MB991958, check actuator test 
item 10: Evaporative Emission Purge Solenoid.
(1) Turn the ignition switch to the "ON" position.
(2) Set scan tool MB991958 to the actuator test mode for item 

10, Evaporative emission purge solenoid.

• An operation sound should be heard and vibration 

should be felt when the evaporative emission purge 
solenoid is operated.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the solenoid operating properly?

YES : Go to Step 4.
NO :  Replace the evaporative emission purge solenoid. 

Then go to Step 5.

STEP 4. Using scan tool MB991958, check actuator test 
item 15: Evaporative Emission Ventilation Solenoid.
(1) Turn the ignition switch to the "ON" position.
(2) Set scan tool MB991958 to the actuator test mode for item 

15, Evaporative emission ventilation solenoid.

• An operation sound should be heard and vibration 

should be felt when the evaporative emission ventilation 
solenoid is operated.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the solenoid operating properly?

YES : Repair or replace the vent hose and air filter. Then go 

to Step 5.

NO :  Replace the evaporative emission ventilation 

solenoid. Then go to Step 5.

STEP 5. Test the OBD-II drive cycle. 
(1) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function − OBD-II Drive Cycle − Pattern 4 

P.13A-9

.

(2) Read the diagnostic trouble code.
Q: Is DTC P0441 set?

YES : Retry the troubleshooting.
NO :  The inspection is complete.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-422

DTC P0442: Evaporative Emission Control System Leak Detected (Small Leak)

.

AK704684

L

A

B

C

D

E

F

H

G

I

J

K

AB

Intake manifold

Fuel tank

Check valve

Evaporative emission
purge solenoid

Evaporative emission
ventilation solenoid

Evaporative emission
canister

Fuel tank differential 
pressure sensor

System diagram

Air filter

Vent pipe

AK704685

Evaporative emission canister

AB

AK704687

AB

Evaporative emission purge solenoid

AK704686

Evaporative emission
ventilation solenoid

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-423

TECHNICAL DESCRIPTION

• The ECM monitors the Evaporative Emission 

(EVAP) System pressure.

• The ECM controls the evaporative emission ven-

tilation solenoid. It closes the evaporative emis-
sion ventilation solenoid to seal the evaporative 
emission canister side of the system.

• The evaporative emission purge solenoid is 

opened to allow manifold vacuum to create low 
pressure (vacuum) in the EVAP system.

• When the EVAP system develops a vacuum of 2 

kPa (0.29 psi), the evaporative emission purge 
solenoid is closed and the fuel system vacuum is 
maintained at 2 kPa (0.29 psi).

• The ECM determines whether there is a leak in 

the EVAP system by monitoring the vacuum 
inside the fuel tank.

• The test is stopped when fuel vapor pressure 

exceeds predetermined limits.

.

DESCRIPTIONS OF MONITOR METHODS

Measure reverting pressure after depressurizing by 
intake manifold negative pressure and detect mal-
function if reverting pressure rises largely.

.

MONITOR EXECUTION

Once per driving cycle

.

MONITOR EXECUTION CONDITIONS 
(OTHER MONITOR AND SENSOR)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Evaporative emission purge solenoid monitor
• Evaporative emission purge system monitor
• Fuel tank differential pressure sensor monitor
• Evaporative emission ventilation solenoid monitor
• Fuel level sensor monitor
• Fuel tank temperature sensor monitor

 Sensor (The sensors below are determined to be 

normal)

• Mass airflow sensor
• Barometric pressure sensor
• Intake air temperature sensor
• Engine coolant temperature sensor

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-424

DTC SET CONDITIONS
Logic Flow Chart  (Monitor Sequence)

.

Check Conditions

• Amount of remaining fuel is 15 − 40 percent of 

capacity when the engine is started.

• Engine coolant temperature is less than 36° C 

(97° F) when the engine is started.

• Intake air temperature is less than 36° C (97° F) 

when the engine is started.

• Engine coolant temperature is more than 60° C 

(140° F).

• Intake air temperature is more than −10° C (14° F).
• Fuel temperature is less than 36° C (97° F).
• Power steering pressure switch: "OFF"
• When the evaporative emission purge solenoid 

and evaporative emission ventilation solenoid are 
closed, the change of the pressure in the fuel 
tank is less than 451 Pa (0.13 in.Hg).

• The pressure fluctuation is less than 647 Pa (0.19 

in.Hg).

AK604523

Start

Yes

No

Monitoring 
conditions?

Depressurize fuel tank pressure

Yes

Yes

No

No

Gross leak 

monitoring conditions

Shut purge line

Specified times

have passed

Malfunction

(Gross leak)

Measure reverting
pressure:     PFT  

Yes

Yes

No

No

PFT > PT

Specified times

monitored

Malfunction

End

Good

AB