Mitsubishi Eclipse. Manual - part 520

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-623

STEP 3. Using scan tool MB991958, check data list item 11: 
Heated Oxygen Sensor Bank 2, Sensor 1 (left 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 Bank 2, Sensor 1 (left 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 P0150 

− Heated Oxygen Sensor Circuit 

(bank 2, sensor 1) 

P.13B-331

, DTC P0151 

− Heated 

Oxygen Sensor Circuit Low Voltage (bank 2, sensor 
1) 

P.13B-350

, DTC P0152 

− Heated Oxygen Sensor 

Circuit High Voltage (bank 2, sensor 1) 

P.13B-358

, 

DTC P0153 

− Heated Oxygen Sensor Circuit Slow 

Response (bank 2, sensor 1) 

P.13B-364

, DTC P0154 

− Heated Oxygen Sensor No Activity Detected (bank 

2, sensor 1) 

P.13B-370

.

STEP 4. Using scan tool MB991958, check data list item 11: 
Heated Oxygen Sensor Bank 2, Sensor 1 (left 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 Bank 2, Sensor 1 (left 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 left bank 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) <3.0L>

13B-624

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.13B-7

.

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

YES : Replace the left bank 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.13B-7

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0431 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.13B-7

.

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

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

DTC P0441: Evaporative Emission Control System Incorrect Purge Flow

AK300069AB

CONNECTOR: B-33 <WITHOUT INTAKE 
MANIFOLD TUNING  SYSTEM>

EVAPORATIVE
EMISSION
PURGE
SOLENOID
VALVE

B-33 (B)

AK300077

CONNECTOR: B-33 <WITH INTAKE 
MANIFOLD TUNING  SYSTEM>

AB

EVAPORATIVE
EMISSION PURGE
SOLENOID VALVE

B-33 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-625

.

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.

.

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

.

AK300115

CONNECTOR: D-10

EVAPORATIVE EMISSION
VENTILATION SOLENOID

AB

D-10 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-626

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.13B-7

.

.

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

• Evaporative emission purge solenoid failed.

• Evaporative emission ventilation solenoid 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