Mitsubishi Montero Sport (2004+). Manual - part 273

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-505

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• ON duty cycle of the evaporative emission purge 

solenoid is 0 percent.

• 20 seconds have elapsed from the time the duty 

cycle of the evaporative emission purge solenoid 
has turned to 0 percent.

Judgment Criteria

• The pressure in the fuel tank is −2 kPa (-0.59 

in.Hg) or less.

.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Procedure 1 

− Evaporative Emission System 

Leak Monitor 

P.13A-4

.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this code to be set are:)

• Evaporative emission purge solenoid failed.

• Evaporative emission ventilation solenoid failed.

• Choking up of hose between evaporative emis-

sion canister and evaporative emission ventila-
tion solenoid.

• Fuel tank differential pressure sensor circuit 

related part(s) failed.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I

• MB991827: USB Cable

• MB991911: Main Harness B

START

END

NO

NO

NO

NO

YES

YES

YES

NO

MALFUNCTION

GOOD

CONTINUOUS

FAILURE FOR 100msecs

MONITORING CONDITIONS FOR

MALFUNCTION DETECTION

AK204004

FUEL-TANK PRESSURE

< -2kPa (-0.58in.Hg)

MONITORING CONDITIONS FOR

PASS JUDGEMENT?

REVERTING PRESSURE

 DETECTED DURING

EVAP MONITOR?

YES

YES

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-506

STEP1. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).

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) Turn the ignition switch to the "ON" position.
(3) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P0451 set?

YES : Refer to DTC P0451 

− Evaporative Emission Control 

System Pressure Sensor Range/Performance 

P.13A-541

.

NO :  Go to Step 2.

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 -3.3 to 3.3 

kPa (-0.97 to 0.97 in.Hg).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the fuel tank pressure between 

−3.3 and 3.3 kPa 

(

−0.97 to 0.97 inHg)?

YES : Go to Step 3.
NO :  Refer to DTC P0451 

− Evaporative Emission Control 

System Pressure Sensor Range/Performance 

P.13A-541

.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-507

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.

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.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-508

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-4

.

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

YES : Go to Step 1.
NO :  The procedure is complete.

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

AC005137

AB

A

Q

O

N

P

B

C

M*

M*

E

A

D

M

E

L

K

F

G

I

H

FUEL TANK

EVAPORATIVE
EMISSION
CANISTER

EVAPORATIVE
EMISSION
PURGE SOLENOID

EVAPORATIVE
EMISSION
VENTILATION
SOLENOID

CHECK VALVE A

CHECK VALVE B

INTAKE MANIFOLD

SYSTEM DIAGRAM

J

VENT VALVE MODULE

NOTE
*: Manifold port

FUEL TANK DIFFERENTIAL
PRESSURE SENSOR

ACX01347AB

EVAPORATIVE EMISSION
PURGE SOLENOID

AC004938AB

EVAPORATIVE EMISSION
VENTILATION SOLENOID