Mitsubishi Eclipse. Manual — part 476
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-447
Judgment Criteria
• Long-term fuel trim has continued to be higher
than +12.5 percent for 5 seconds.
or
• Short-term fuel trim has continued to be higher
than +7.4 percent for 5 seconds.
Check Conditions
• Engine coolant temperature is lower than approx-
imately 100
°C (212°F) when the engine is
started.
• Intake air temperature is lower 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.
or
• 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.
or
• Short-term fuel trim has continued to be higher
than +17.6 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 less.
Judgment Criteria
• Long-term fuel trim has continued to be higher
than +12.5 percent for 5 seconds.
or
• 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.
or
• 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
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Volume airflow sensor failed.
• Injector (Number 1, 3, 5) failed.
• Incorrect fuel pressure.
• Air drawn in from gaps in gasket, seals, etc.
• Right 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.
• Harness damage in right bank injector circuit, or
connector damage.
• ECM failed. <M/T>
• PCM failed. <A/T>
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-448
STEP 1. Check the exhaust leaks.
Q: Are there any abnormalities?
YES : Go to Step 2.
NO : Repair it. Then go to Step 16.
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 16.
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
, DTC P0102
− Volume Airflow Circuit Low Input
.
AK300810
AB
MB991911
16-PIN
MB991827
MB991824
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-449
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
, DTC P0112
− Intake Air Temperature Circuit Low Input
, DTC P0113
− Intake Air Temperature
Circuit High Input
.
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
P0117
− Engine Coolant Temperature Circuit Low
, DTC P0118
− Engine Coolant
Temperature Circuit High Input
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-450
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
, DTC P2228
− Barometric Pressure Circuit Low Input
DTC P2229
− Barometric Pressure Circuit High Input
STEP 7. Check connector B-48 at injector intermediate
connector 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
. Then go to Step 16.
AK300810
AB
MB991911
16-PIN
MB991827
MB991824
AK300751
1
2
3
4
CONNECTOR: B-48
AB
B-48 (B)
HARNESS CONNECTOR:
COMPONENT SIDE
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