Mitsubishi Eclipse. Manual - part 244

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-469

STEP 3. Using scan tool MB991958, check data list item 11: 
Heated Oxygen Sensor (front).
(1) Start the engine and run at idle.
(2) Set scan tool MB991958 to the data reading mode for item 

11, Heated Oxygen Sensor (front).

• Warming up the engine. When the engine is revved, the 

output voltage should be 0.6 to 1.0 volt.

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

YES : Go to Step 4.
NO :  Refer to, DTC P0130 

− Heated Oxygen Sensor Circuit 

(sensor 1) 

P.13A-214

, DTC P0131 

− Heated Oxygen 

Sensor Circuit Low Voltage (sensor 1) 

P.13A-233

, 

DTC P0132 

− Heated Oxygen Sensor Circuit High 

Voltage (sensor 1) 

P.13A-241

, DTC P0133 

− Heated 

Oxygen Sensor Circuit Slow Response (sensor 1) 

P.13A-247

, DTC P0134 

− Heated Oxygen Sensor 

Circuit No Activity Detected (sensor 1) 

P.13A-253

.

STEP 4. Using scan tool MB991958, check data list item 11: 
Heated Oxygen Sensor (front).
(1) Start the engine and run at idle.
(2) Set scan tool MB991958 to the data reading mode for item 

11, Heated Oxygen Sensor (front).

(3) Keep the engine speed at 2,000 r/min.

• 0 − 0.4 and 0.6 − 1.0 volt should alternate 15 times or 

more within 10 seconds.

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

YES : Go to Step 5.
NO :  Replace the heated oxygen sensor (front). Then go to 

Step 7.

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-470

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) Check the diagnostic trouble code (DTC).
Q: Is DTC P0421 set?

YES : Replace the 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) Check the diagnostic trouble code (DTC).
Q: Is DTC P0421 set?

YES : Replace the ECM or 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 P0421 set?

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

DTC P0441: Evaporative Emission Control System Incorrect Purge Flow

.

TECHNICAL DESCRIPTION

• ECM <M/T> or PCM <A/T> detects stuck open of 

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

• Stuck open of evaporative emission purge sole-

noid valve is judged through monitoring leak of 
evaporative emission system.

• Stuck close of evaporative emission ventilation 

solenoid valve is judged after 20 seconds of end 
of monitoring leak of evaporative emission sys-
tem, or of usual operation of evaporative emis-
sion purge solenoid from ON to OFF.

.

DESCRIPTIONS OF MONITOR METHODS
Fuel tank pressure decreases largely during 

purge-cut.

.

AK300055

EVAPORATIVE
EMISSION PURGE
SOLENOID VALVE

AC

B-33 (B)

CONNECTOR: B-33

AK300115

CONNECTOR: D-10

EVAPORATIVE EMISSION
VENTILATION SOLENOID

AB

D-10 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-471

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

.

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 (-0.6 

in.Hg) or less for 0.1 second.

.

OBD-ll DRIVE CYCLE PATTERN
Refer to Diagnostic Function 

− OBD-ll 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

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) <2.4L>

13A-472

DIAGNOSIS

Required Special Tools:

• MB991958 (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

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-517

.

NO :  Go to Step 2.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824