Mitsubishi Eclipse. Manual - part 546

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-727

STEP 19. Check connectors D-16 at intermediate 
connector and D-18 at fuel tank differential pressure 
sensor for damage.
Q: Are the connectors in good condition?

YES : Go to Step 20.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 22.

STEP 20. Check the harness wire between intermediate 
connector D-16 terminal 5 and fuel tank differential 
pressure sensor connector D-18 terminal 1 for damage.
Q: Is the harness wire in good condition?

YES : Replace the fuel tank differential pressure sensor. 

Then go to Step 22.

NO :  Repair it. Then go to 22.

AC001787AD

CONNECTOR: D-16

AC103356

FUEL TANK

AD

CONNECTOR: D-18
FUEL TANK DIFFERENTIAL 
PRESSURE SENSOR

AC001787AD

CONNECTOR: D-16

AC103356

FUEL TANK

AD

CONNECTOR: D-18
FUEL TANK DIFFERENTIAL 
PRESSURE SENSOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-728

STEP 21. Using scan tool MB991958, check data list item 
73: Fuel Tank Differential Pressure Sensor.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.

(2) Disconnect hose I from the evaporative emission canister 

side, and plug the hose from which the pipes have been 
disconnected.

(3) Turn the ignition switch to the "ON" position.
(4) Remove the fuel cap.
(5) Set scan tool MB991958 to the data reading mode for item 

73, Fuel Tank Differential Pressure Sensor.

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

(

−0.443 to 0.443 inHg.)

(6) Connect an evaporative emission system pressure pump to 

the fuel filler neck, and apply pressure.

• The scan tool reading should increase.

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

disconnect scan tool MB991958.

Q: Is the scan tool reading within the specified value?

YES : This malfunction is intermittent malfunction. Refer to 

GROUP 00, How to Use Troubleshooting/Inspection 
Service Points 

P.00-6

. Then go to Step 22.

NO :  Replace the ECM <M/T> or PCM <A/T>. Then go to 

Step 22.

AC303127

AB

MB991911

16-PIN

MB991827

MB991824 

AC002072 AB

HOSE I

AC000186

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-729

STEP 22. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern (Refer to 

Diagnostic Function 

− OBD-ll Drive Cycle − Procedure 1 − 

Evaporative Emission System Leak Monitor 

P.13B-7

).

(2) Read the diagnostic trouble code.
Q: Is diagnostic trouble code P0453 set?

YES : Go to Step 2.
NO :  This diagnosis is complete.

DTC P0455: Evaporative Emission Control System Leak Detected (Gross Leak)

AC001944

CHECK VALVE A

CHECK 
VALVE B

EVAPORATIVE 
EMISSION CANISTER

FUEL TANK

EVAPORATIVE 
EMISSION 
VENTILATION 
SOLENOID

EVAPORATIVE EMISSION 
PURGE SOLENOID

INTAKE MANIFOLD

SYSTEM DIAGRAM <VEHICLES WITHOUT INTAKE MANIFOLD TUNING SYSTEM>

B

C

E

F

G

Q

R

I

H

K

J

L

N

O

M

AB

P

A

D

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-730

.

TECHNICAL DESCRIPTION

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

the ECM <M/T> or PCM <A/T> measures 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 shut 
off the evaporative emission canister outlet port.

• 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).

AC106496

CHECK VALVE A

CHECK 
VALVE B

EVAPORATIVE 
EMISSION CANISTER

FUEL TANK

EVAPORATIVE 
EMISSION 
VENTILATION 
SOLENOID

EVAPORATIVE EMISSION 
PURGE SOLENOID

INTAKE MANIFOLD

SYSTEM DIAGRAM <VEHICLES WITH INTAKE MANIFOLD TUNING SYSTEM>

B

C

E

F

G

Q

R

I

H

K

J

L

N

O

M

AD

P

AC000183AB

EVAPORATIVE EMISSION CANISTER

FUEL TANK

AC002073AD

EVAPORATIVE EMISSION PURGE 
SOLENOID <VEHICLES WITHOUT 
INTAKE MANIFOLD TUNING SYSTEM>

AC106497

AC

EVAPORATIVE EMISSION PURGE SOLENOID
<VEHICLES WITH INTAKE MANIFOLD TUNING 
SYSTEM>

AIR INTAKE HOSE

AC002035AB

EVAPORATIVE EMISSION 
VENTILATION SOLENOID