Mitsubishi Eclipse. Manual — part 211
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-337
STEP 12. Check for entry of foreign matter (water,
kerosene, etc.) into fuel.
Q: Are there any abnormalities?
YES : Go to Step 13.
NO : Replace the fuel. Then go to Step 14.
STEP 13. Replace the injector.
(1) Replace the injector.
(2) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− OBD-II Drive Cycle − Procedure 2 −
Fuel Trim Monitor
(3) Check the diagnostic trouble code (DTC).
Q: Is DTC P0171 set?
YES : Replace the ECM or PCM. Then go to Step 14.
NO : The inspection is complete.
STEP 14. 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 2 −
Fuel Trim Monitor
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0171 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0172: System too Rich
.
System too Rich Circuit
• Refer to, DTC P0201 − P0204 Injector Circuit
Malfunction
.
CIRCUIT OPERATION
• Refer to, DTC P0201 − P0204 Injector Circuit
Malfunction
.
TECHNICAL DESCRIPTION
• If a malfunction occurs in the fuel system, the fuel
trim value becomes too small.
• The ECM <M/T> or PCM <A/T> checks whether
the fuel trim value is within a specified range.
.
DESCRIPTIONS OF MONITOR METHODS
Air/fuel learning value (long term fuel trim) and
air/fuel feedback integral value (short term fuel
trim) are too rich.
.
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)
• Misfire monitor
Sensor (The sensor below is determined to be
normal)
• Volume airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
• Throttle position sensor
.
AK300737
1
2
CONNECTORS: B-01, B-02, B-05, B-06
AB
B-02 (GR)
B-01 (GR)
B-05 (GR)
B-06 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-338
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Under the closed loop air/fuel ratio control.
• Engine coolant temperature is higher than 77°C
(171
°F).
• Volume airflow sensor output frequency is 88 Hz
or more.
Judgment Criteria
• Long-term fuel trim has continued to be lower
than
−12.5 percent for 5 seconds.
or
• Short-term fuel trim has continued to be lower
than
−10.0 percent for 5 seconds.
Check Conditions
• Under the closed loop air/fuel ratio control.
• Engine coolant temperature is higher than 77°C
(171
°F).
• Volume airflow sensor output frequency is 88 Hz
or less.
Judgment Criteria
• Long-term fuel trim has continued to be lower
than
−12.5 percent for 5 seconds.
or
• Short-term fuel trim has continued to be lower
than
−15.0 percent for 5 seconds.
K
LRN
: LONG-TERM TRIM
K
I
: SHORT-TERM TRIM
K0 : MAXIMUM LIMIT OF LONG-TERM TRIM
K1 : MAXIMUM LIMIT OF SHORT-TERM TRIM
K2 : MINIMUM LIMIT OF LONG-TERM TRIM
K3 : MINIMUM LIMIT OF SHORT-TERM TRIM
START
MONITORING
CONDITIONS
END
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
K
LRN
> K0
MALFUNCTION
GOOD
K
LRN
< K2
K
I
< K3
K
I
> K1
CONTINUOUS FAILURE
FOR 5secs
AK204050
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-339
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 failed.
• Incorrect fuel pressure.
• Engine coolant temperature sensor failed.
• Intake air temperature sensor failed.
• Barometric pressure sensor failed.
• ECM failed. <M/T>
• PCM failed. <A/T>
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, 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 12 and 38 Hz (between 1.7 and
4.2 g/s).
• When 2,500 r/min, between 55 and 95 Hz (between 7.9
and 12.1 g/s).
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : Go to Step 2.
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) <2.4L>
13A-340
STEP 2. 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 3.
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 3. 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 4.
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
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