Mitsubishi Galant (2004+). Manual - part 946

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-601

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 3 − 

Catalytic Converter Monitor 

P.13A-5

.

(2) Read the diagnostic trouble code.
Q: Is DTC P0431 set?

YES : Replace the cylinder 2, 3 side catalytic converter. 

Then go to Step 6.

NO :  The inspection is complete.

STEP 6. 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 3 − 

Catalytic Converter Monitor 

P.13A-5

.

(2) Read the diagnostic trouble code.
Q: Is DTC P0431 set?

YES : Replace the PCM. Then go to Step 7.
NO :  The inspection is complete.

STEP 7. 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 3 − 

Catalytic Converter Monitor 

P.13A-5

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0431 set?

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-602

DTC P0441: Evaporative Emission Control System Incorrect Purge Flow

.

TECHNICAL DESCRIPTION

• PCM detects stuck open condition of evaporative 

emission purge solenoid and stuck close condi-
tion of evaporative emission ventilation solenoid 
by pressure change in fuel tank.

• Stuck open evaporative emission purge solenoid 

is judged through monitoring leak of evaporative 
emission system.

• Stuck closed evaporative emission ventilation 

solenoid is judged after 20 seconds from end of 
monitoring leak of evaporative emission system, 
or of usual operation of evaporative emission 
purge solenoid from ON to OFF.

.

DESCRIPTIONS OF MONITOR METHODS
Fuel tank pressure decreases largely during 

purge-cut.

.

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)

• Fuel tank pressure sensor monitor

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.

AK303867AB

CONNECTOR: B-05

B-05 (B)

EVAPORATIVE
EMISSION
PURGE
SOLENOID

INTAKE 
MANIFOLD

AK303868AB

EVAPORATIVE 
EMISSION
VENTILATION 
SOLENOID

CONNECTOR: F-08

F-08 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-603

DTC SET CONDITIONS

Logic Flow Chart

Check Conditions

• Engine is running.

• ON duty cycle of the evaporative emission purge 

solenoid is 0 percent.

• 20 seconds have elapsed since the duty cycle of 

the evaporative emission purge solenoid has 
turned to 0 percent.

Judgment Criteria

• The pressure in the fuel tank is −1.96 kPa (−0.58 

in.Hg) or less for 0.1 second.

.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Procedure 1 

− Evaporative Emission System 

Leak Monitor 

P.13A-5

.

.

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

• Evaporative emission purge solenoid failed.

• Evaporative emission ventilation solenoid failed.

• Fuel tank differential pressure sensor circuit 

related part(s) failed.

START

END

NO

NO

NO

NO

YES

YES

YES

NO

MALFUNCTION

GOOD

CONTINUOUS

FAILURE FOR 100msecs

MONITORING CONDITIONS FOR

MALFUNCTION DETECTION

AK302230

FUEL-TANK PRESSURE

< -1.96kPa (-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) <2.4L ENGINE>

13A-604

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

STEP 1. 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-644

.

NO :  Go to Step 2. 

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827