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Mitsubishi Eclipse. Manual - part 480

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-463

• Engine coolant temperature is higher than 77°C

(171

°F).

• Volume airflow sensor output frequency is 75 Hz

or less.

Judgment Criteria

• Long-term fuel trim has continued to be higher

than +12.5 percent for 5 seconds.

• Short-term fuel trim has continued to be higher

than +12.5 percent for 5 seconds.

Check Conditions

• Engine coolant temperature is higher than

approximately 100

°C (212°F) when the engine is

started.

• Intake air temperature is higher than 60°C

(140

°F) when the engine is started.

• Under the closed loop air/fuel ratio control.

• Engine coolant temperature is higher than 77°C

(171

°F).

• Volume airflow sensor output frequency is 75 Hz

or more.

Judgment Criteria

• Long-term fuel trim has continued to be higher

than +12.5 percent for 5 seconds.

• Short-term fuel trim has continued to be higher

than +17.6 percent for 5 seconds.

Check Area

• Engine coolant temperature is higher than

approximately 100

°C (212°F) when the engine is

started.

• Intake air temperature is higher than 60°C

(140

°F) when the engine is started.

• Under the closed loop air/fuel ratio control.

• Engine coolant temperature is higher than 77°C

(171

°F).

• Volume airflow sensor output frequency is 75 Hz

or less.

Judgment Criteria

• Long-term fuel trim has continued to be higher

than +12.5 percent for 5 seconds.

• Short-term fuel trim has continued to be higher

than +22.3 percent for 5 seconds.

Check Conditions

• Engine coolant temperature is higher than 77°C

(171

°F).

• Under the closed loop air/fuel ratio control.

Judgment Criteria

• Long-term fuel trim has continued to be +12.5

percent for 5 seconds.

• Short-term fuel trim has continued to be +25.0

percent for 5 seconds.

OBD-ll DRIVE CYCLE PATTERN
Refer to , Diagnostic Function

− OBD-ll Drive Cycle −

Procedure 2

− Fuel Trim Monitor

P.13B-7

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

• Volume airflow sensor failed.

• Injector (Number 2, 4, 6) failed.

• Incorrect fuel pressure.

• Air drawn in from gaps in gasket, seals, etc.

• Left bank heated oxygen sensor failed.

• Engine coolant temperature sensor failed.

• Intake air temperature sensor failed.

• Barometric pressure sensor failed.

• Use of incorrect or contaminated fuel.

• ECM failed. <M/T>

• PCM failed. <A/T>

• Harness damage in left bank injector circuit, or

connector damage.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

STEP 1. Check the exhaust leaks.
Q: Are there any abnormalities?

YES : Go to Step 2.
NO : Repair it. Then go to Step 14.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-464

STEP 2. Check the intake system vacuum leak.
Q: Are there any abnormalities?

YES : Go to Step 3.
NO : Repair it. Then go to Step 14.

STEP 3. Using scan tool MB991958, check data list item 12:
Volume Airflow Sensor.

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) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item

12, Volume Airflow Sensor.

(4) Warm up the engine to normal operating temperature: 80

°C

to 96

°C (176°F to 205°F).

• When idling, between 17 and 46 Hz (between 2.2 and

5.7 g/s).

• When 2,500 r/min, between 63 and 103 Hz (between

9.0 and 14.7 g/s).

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

YES : Go to Step 4.
NO : Refer to DTC P0101

− Volume Airflow Circuit

Range/Performance Problem

P.13B-30

, DTC P0102

− Volume Airflow Circuit Low Input

P.13B-41

AK300810

MB991911

16-PIN

MB991827

MB991824

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-465

STEP 4. Using scan tool MB991958, check data list item 13:
Intake Air Temperature Sensor.
(1) Turn the ignition switch to the "ON" position.
(2) Set scan tool MB991958 to the data reading mode for item

13, Intake Air Temperature Sensor.

• The intake air temperature and temperature shown with

the scan tool should approximately match.

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

YES : Go to Step 5.
NO : Refer to DTC P0111

− Intake Air Temperature Circuit

Range/Performance Problem

P.13B-101

, DTC P0112

− Intake Air Temperature Circuit Low Input

P.13B-111

, DTC P0113

− Intake Air Temperature

Circuit High Input

P.13B-118

STEP 5. Using scan tool MB991958, check data list item 21:
Engine Coolant Temperature Sensor.
(1) Turn the ignition switch to the "ON" position.
(2) Set scan tool MB991958 to the data reading mode for item

21, Engine Coolant Temperature Sensor.

• The engine coolant temperature and temperature

shown with the scan tool should approximately match.

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

YES : Go to Step 6.
NO : Refer to DTC P0116

− Engine Coolant Temperature

Circuit Range/Performance Problem

P.13B-130

, DTC

P0117

− Engine Coolant Temperature Circuit Low

Input

P.13B-144

, DTC P0118

− Engine Coolant

Temperature Circuit High Input

P.13B-151

AK300810

MB991911

16-PIN

MB991827

MB991824

AK300810

MB991911

16-PIN

MB991827

MB991824

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-466

STEP 6. Using scan tool MB991958, check data list item 25:
Barometric Pressure Sensor.
(1) Turn the ignition switch to the "ON" position.
(2) Set scan tool MB991958 to the data reading mode for item

25, Barometric Pressure Sensor.

• When altitude is 0 m (0 foot), 101 kPa (29.8 in.Hg).

• When altitude is 600 m (1,969 feet), 95 kPa (28.1 in.Hg).

• When altitude is 1,200 m (3,937 feet), 88 kPa (26.0

in.Hg).

• When altitude is 1,800 m (5,906 feet), 81 kPa (23.9

in.Hg).

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

YES : Go to Step 7.
NO : Refer to DTC P2227

− Barometric Pressure Circuit

Range/Performance Problem

P.13B-867

, DTC P2228

− Barometric Pressure Circuit Low Input

P.13B-877

DTC P2229

− Barometric Pressure Circuit High Input

P.13B-897

STEP 7. Check connector B-02, B-06, B-25 at left bank
injector for damage.
Q: Is the connector in good condition?

YES : Go to Step 8.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 14.

AK300810

MB991911

16-PIN

MB991827

MB991824

AK300753

CONNECTORS: B-02, B-06, B-25

B-02 (GR)

B-06 (GR) B-25 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

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