Mitsubishi Lancer Evolution X. Manual — part 327
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-373
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 14
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0301 set?
YES : Replace the ECM. When the ECM is replaced,
register the ID code. Refer to GROUP 42B, ID Code
Registration Necessity Judgment Table <Vehicles
with KOS>
or GROUP 42C, ID Codes
Registration Judgment Table <Vehicles with WCM>
. Then go to Step 5.
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 14
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0301 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0302: Cylinder 2 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)
13A-374
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
• Engine speed is between 438 and 7,000 r/min.
• Engine coolant temperature is higher than −10° C
(14° F).
• Barometric pressure is higher than 76 kPa (22.4
in.Hg).
• The engine load is with in the positive torque
load.
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)
13A-375
• Adaptive learning is complete for the vane which
generates a crankshaft position signal.
• While the engine is running, excluding rough road
driving <M/T>, sudden acceleration/deceleration
and fuel shut-off operation.
Judgement Criteria (change in the angular accel-
eration of the crankshaft is used for misfire
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
• Misfire has occurred in 2.0 percent or more of the
last 1,000 revolutions (corresponding to 1.5 times
the limit of emission standard).
.
FAIL-SAFE AND BACKUP FUNCTION
• The supply of fuel to the misfiring cylinder can
possibly be cut.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function − OBD-II Drive Cycle −
Pattern 14
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Ignition system related part(s) failed.
• Low compression pressure.
• ECM failed.
DIAGNOSIS
STEP 1. Visual check on ignition spark of No. 2 cylinder.
(1) Remove the spark plug and install it to the ignition coil.
(2) Connect the ignition coil connector.
(3) Remove all injector connector.
(4) At the engine start, check spark plug produces a spark.
Q: Did it spark?
YES : Go to Step 3.
NO : Go to Step 2.
STEP 2. Check the No. 2 cylinder spark plug.
Refer to GROUP 16, Ignition System − On-vehicle Service −
Spark Plug Check And Cleaning
.
Q: Is the spark plug normal?
YES : Refer to, Symptom Procedures 26 − Ignition Circuit
System
NO : Replace the No. 2 cylinder spark plug. Then go to
Step 5.
STEP 3. Check the compression.
Refer to GROUP 11A, On-vehicle Service − Compression Pres-
.
Q: Are there any abnormalities?
YES : Repair or replace it. Then go to Step 5.
NO : Go to Step 4.
AK704268 AB
Spark plug
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-376
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 14
(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, ID Code
Registration Necessity Judgment Table <Vehicles
with KOS>
or GROUP 42C, ID Codes
Registration Judgment Table <Vehicles with WCM>
. Then go to Step 5.
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 14
(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
.
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