Mitsubishi Outlander GS45X. Manual — part 871
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-417
STEP 4. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− OBD-II Drive Cycle − Pattern 15
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0302 set?
YES : Replace the ECM. When the ECM is replaced,
register the ID code. Refer to GROUP 42B, Diagnosis
− ID Codes Registration Judgment Table <Vehicles
or GROUP 42C, Diagnosis
− ID
Codes Registration Judgment Table <Vehicles with
WCM>
NO : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunctions
.
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 − Pattern 15
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0302 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0303: Cylinder 3 Misfire Detected
.
TECHNICAL DESCRIPTION
• If a misfire occurs while the engine is running, the
engine speed changes for an instant.
• The ECM checks for such changes in engine
speed.
.
DESCRIPTIONS OF MONITOR METHODS
Monitor angular acceleration of crankshaft and
detect malfunction when negative variation of the
angular acceleration is large.
.
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)
• Not applicable
Sensor (The sensor below is determined to be
normal)
• Camshaft position sensor
• Mass airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
• Throttle position sensor
.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-418
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Engine speed is between 438 and 6,500 r/min.
• Engine coolant temperature is higher than −10°C
(14
°F).
Calculate crankshaft
angular acceleration (An)
Misfire
Calculate percent misfire (R
MF
)
End
No
No
No
No
No
No
Yes
Good
Within 1000rev
Malfunction
(exceed std × 1.5)
Good
Malfunction (catalytic
converter is damaged.)
Good
Calculate percent misfire (R
MF
)
Within 200rev
Ne
Ec : Charge efficiency
TH
MF
: Threshold value for misfire
TH
CD
: Threshold value for catalyst damage
AK800585
Start
Yes
Yes
Yes
Yes
Yes
Monitoring
conditions
An < TH
MF
(Ne, Ec)
R
MF
>= specified value
R
MF
>= TH
CD
(Ne, Ec)
: Engine speed
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-419
• Barometric pressure is higher than 76 kPa (22.4
in.Hg).
• The engine load is with in the positive torque
load.
• Adaptive learning is complete for the vane which
generates a crankshaft position signal.
• While the engine is running, excluding sudden
acceleration/deceleration and fuel shut-off opera-
tion.
Judgement Criterion (change in the angular
acceleration of the crankshaft is used for mis-
fire detection).
• Misfire has occurred more frequently than
allowed during the last 200 revolutions [when the
catalyst temperature is higher than 1,000
°C
(1,832
°F)].
or
• The occurrence rate of engine misfiring within the
1,000 engine revolutions is more than 1.7 %
<Except for California> or 1.8 % <California>.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Spark plug failed.
• Ignition system related part(s) failed.
• Low compression pressure.
• ECM failed.
DIAGNOSIS
STEP 1. Check the No. 3 cylinder ignition coil spark.
(1) Remove the intake manifold.
(2) Remove the No. 3 cylinder ignition coil.
(3) Remove the spark plug and connect to the No.3 cylinder
ignition coil.
(4) Ground the spark plug side electrode securely.
• When the engine is cranked, the spark plug should
spark.
Q: Did it spark?
YES : Go to Step 3.
NO : Go to Step 2.
STEP 2. Check the No. 3 cylinder spark plugs.
Refer to GROUP 16, Ignition System
− On-vehicle Service −
Spark Plug Check And Cleaning
.
Q: Is the spark plug normal?
YES : Refer to INSPECTION PROCEDURE 24
− Ignition
Circuit System
.
NO : Replace the No. 3 cylinder spark plug. Then go to
Step 5.
STEP 3. Check the compression.
Refer to GROUP 11C, On-vehicle Service
− Compression
Pressure Check
Q: Are there any abnormalities?
YES : Replace it. Then go to Step 5.
NO : Go to Step 4.
AK700310AB
Spark plug
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-420
STEP 4. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− OBD-II Drive Cycle − Pattern 15
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0302 set?
YES : Replace the ECM. When the ECM is replaced,
register the ID code. Refer to GROUP 42B, Diagnosis
− ID Codes Registration Judgment Table <Vehicles
or GROUP 42C, Diagnosis
− ID
Codes Registration Judgment Table <Vehicles with
WCM>
NO : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunctions
.
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 − Pattern 15
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0303 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0304: Cylinder 4 Misfire Detected
.
TECHNICAL DESCRIPTION
• If a misfire occurs while the engine is running, the
engine speed changes for an instant.
• The ECM checks for such changes in engine
speed.
.
DESCRIPTIONS OF MONITOR METHODS
Monitor angular acceleration of crankshaft and
detect malfunction when negative variation of the
angular acceleration is large.
.
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)
• Not applicable
Sensor (The sensor below is determined to be
normal)
• Camshaft position sensor
• Mass airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
• Throttle position sensor
.
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