Mitsubishi Galant (2004+). Manual — part 926
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-521
STEP 10. 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 6 −
Other Monitor
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0300 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0301: Cylinder 1 Misfire Detected
CAUTION
If DTC P0301 has been set, TCL related DTC
U1120 is also set. After P0301 has been diag-
nosed, don't forget to erase DTC U1120.
.
TECHNICAL DESCRIPTION
• If a misfire occurs while the engine is running, the
engine speed changes for an instant.
• The PCM 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) <2.4L ENGINE>
13A-522
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
• Engine speed is between 500 and 6,500 r/min.
• Engine coolant temperature is higher than −10°C
(14
°F).
• Barometric pressure is higher than 76 kPa (22.4
in.Hg).
• Volumetric efficiency is at between 30 and 55
percent.
• Adaptive learning is complete for the vane which
generates a crankshaft position signal.
• While the engine is running, excluding gear shift-
ing, deceleration, sudden acceleration/decelera-
tion and A/C compressor switching.
• The throttle deviation is −0.06 V/10 ms to +0.06
V/10 ms.
START
MONITORING
CONDITIONS
CALCULATE CRANKSHAFT
ANGULAR ACCELERATION (A
N
)
A
N
< TH
MF
(Ne, v)
MISFIRE
CALCULATE PERCENT MISFIRE (R
MF
)
END
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
GOOD
WITHIN 1000rev
R
MF
> SPECIFIED VALUE
MALFUNCTION
(EXCEED STD ×1.5)
GOOD
MALFUNCTION
(CATALYTIC CONVERTER
IS DAMAGED.)
GOOD
R
MF
> TH
CD
(Ne, v)
CALCULATE PERCENT MISFIRE (R
MF
)
WITHIN 200rev
Ne: ENGINE SPEED
v: VOLUMETRIC EFFICIENCY
AK302033
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-523
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 950
°C
(1,742
°F)].
or
• Misfire has occurred in 15 or more of the last
1,000 revolutions (corresponding to 1.5 times the
limit of emission standard). <Federal>
or
• Misfire has occurred in 10 or more of the last
1,000 revolutions (corresponding to 1.5 times the
limit of emission standard). <California>
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Procedure 6
.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• Ignition system related part(s) failed.
• Low compression pressure.
• PCM failed.
DIAGNOSIS
STEP 1. Check the No. 1 cylinder ignition coil spark.
(1) Remove the No. 1 cylinder ignition coil.
(2) Remove the No. 1 cylinder spark plug and connect to the
No. 1 cylinder ignition coil.
(3) 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. 1 cylinder spark plug.
CAUTION
Do not attempt to adjust the gap of the iridium plug. Clean-
ing of the iridium plug may result in damage to the iridium
and platinum tips. Therefore, if carbon deposits must be
removed, use a plug cleaner and complete cleaning within
20 seconds to protect the electrode. Do not use a wire
brush.
(1) Check the plug gap and replace if the limit is exceeded.
Standard value: 0.7
− 0.8 mm (0.028 − 0.031 inch)
Limit: 1.0 mm (0.039 inch)
Q: Is the plug gap at the standard value?
YES : Refer to, INSPECTION PROCEDURE 31
− Ignition
Circuit System
NO : Replace the No. 1 cylinder spark plug. Then go to
Step 5.
AKX00432
SPARK PLUG
AB
AKX01327AB
IRIDIUM
TIP
PLATINUM
TIP
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-524
STEP 3. Check the compression.
Refer to GROUP 11A, On-Vehicle Service
− Compression
Pressure Check
Q: Are there any abnormalities?
YES : Repair or replace it. Then go to Step 5.
NO : Go to Step 4.
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 − Procedure 6 −
Other Monitor
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0301 set?
YES : Replace the PCM. 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
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 − Procedure 6 −
Other Monitor
(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
CAUTION
If DTC P0302 has been set, TCL related DTC
U1120 is also set. After P0302 has been diag-
nosed, don't forget to erase DTC U1120.
.
TECHNICAL DESCRIPTION
• If a misfire occurs while the engine is running, the
engine speed changes for an instant.
• The PCM 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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