Mitsubishi Galant (2004+). Manual — part 1219
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-569
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Engine speed is between 440 and 6,200 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 60
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 (An)
An < 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
AK204053
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-570
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 20 or more of the last
1,000 revolutions (corresponding to 1.5 times the
limit of emission standard).
.
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.5 cylinder ignition coil spark.
(1) Remove the No.5 cylinder intake manifold.
(2) Remove the No.5 cylinder ignition coil.
(3) Remove the No.5 cylinder spark plug and connect to the
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.5 cylinder 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) Remove the intake manifold.
(2) 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.5 cylinder spark plug. Then go to Step
AKX00432
SPARK PLUG
AB
AKX01327AB
IRIDIUM
TIP
PLATINUM
TIP
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-571
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 P0305 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 P0305 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0306: Cylinder 6 Misfire Detected
CAUTION
If DTC P0306 has been set, TCL related DTC
U1120 is also set. After P0306 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) <3.8L ENGINE>
13B-572
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Engine speed is between 440 and 6,200 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 60
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 (An)
An < 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
AK204053
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