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