Mitsubishi Galant 9G. Manual — part 771
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-526
STEP 6. Check the each ignition coil spark.
(1) Remove the spark plug and connect to the ignition coil.
(2) 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 8.
NO : Go to Step 7.
STEP 7. Check the spark plugs.
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 faulty spark plug. Then go to Step 10.
STEP 8. Check the following items.
(1) Check the following items, and repair or replace the
defective component.
a. Check for skipped timing belt teeth.
b. Check compression.
c. EGR valve failed.
Q: Are there any abnormalities?
YES : Repair or replace it. Then go to Step 10.
NO : Go to Step 9.
STEP 9. 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 −
.
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0300 set?
YES : Replace the PCM. Then go to Step 10.
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
.
AKX00432
SPARK PLUG
AB
AKX01327AB
IRIDIUM
TIP
PLATINUM
TIP
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-527
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 −
(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-528
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-529
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
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