Mitsubishi Eclipse. Manual - part 245

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-473

STEP 2. Using scan tool MB991958, check data list item 73: 
Fuel Tank Differential Pressure Sensor.
(1) Turn the ignition switch to the "ON" position.
(2) Remove the fuel cap.
(3) Set scan tool MB991958 to the data reading mode for item 

73, Fuel Tank Differential Pressure Sensor.

• The fuel tank differential pressures should be −1.5 to 1.5 

kPa ( 

−0.44 to 0.44 in.Hg).

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

YES : Go to Step 3.
NO :  Refer to, DTC P0451 - Evaporative Emission Control 

System Pressure Sensor Range/Performance 

P.13A-517

.

STEP 3. Using scan tool MB991958, check actuator test 
item 08: 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 

08, 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.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-474

STEP 4. Using scan tool MB991958, check actuator test 
item 29: 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 

29, 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 − Procedure 1 − 

Evaporative Emission System Leak Monitor 

P.13A-5

.

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

YES : Go to Step 1.
NO :  This diagnosis is complete.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-475

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

.

TECHNICAL DESCRIPTION

• To judge if there is leak in the fuel system, ECM 

<M/T> or PCM <A/T> measure the change of the 
pressure inside the fuel tank.

• The ECM <M/T> or PCM <A/T> turns on the 

evaporative emission ventilation solenoid to shot 
off the evaporative emission canister outlet port.

AC001943AB

A

B

C

EVAPORATIVE EMISSION 
PURGE SOLENOID

EVAPORATIVE 
EMISSION CANISTER

EVAPORATIVE 
EMISSION 
VENTILATION 
SOLENOID

FUEL TANK

CHECK VALVE A

CHECK 
VALVE B

INTAKE MANIFOLD

SYSTEM DIAGRAM

D

E

F

G

I

H

L

N

M

K

J

O

P

CHAMBER

AC000183AB

EVAPORATIVE EMISSION CANISTER

FUEL TANK

AC000182

EVAPORATIVE EMISSION
PURGE SOLENOID

AB

AC002035AB

EVAPORATIVE EMISSION 
VENTILATION SOLENOID

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-476

• Then the evaporative emission purge solenoid is 

driven to set the fuel system into a negative pres-
sure.

• When the fuel system develops a vacuum of 2 

kPa (0.29 psi), the evaporative emission purge 
solenoid is turned "off" and the fuel system vac-
uum is maintained at 2 kPa (0.29 psi).

• The ECM <M/T> or PCM <A/T> determines if 

there is leak in the fuel system by measuring the 
change of vacuum inside the fuel tank.

• The test is stopped when fuel vapor pressure is 

judged as too high.

.

DESCRIPTIONS OF MONITOR METHODS

• Measure reverting pressure after depressurizing 

by intake manifold negative pressure and detect 
malfunction 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 temperature sensor monitor

 Sensor (The sensors below are determined to be 

normal)

• Volume airflow sensor

• Barometric pressure sensor

• Intake air temperature sensor

• Engine coolant temperature sensor

.