Mitsubishi Galant (2004+). Manual — part 1275
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-793
STEP 4. 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 P0506 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0507: Idle Control Sytem RPM Higher Than Expected
CAUTION
If DTC P0507 has been set, TCL related DTC
U1120 is also set. After P0507 has been diag-
nosed, don't forget to erase DTC U1120.
.
TECHNICAL DESCRIPTION
• The amount of air taken in during idling is regu-
lated by the opening and closing of the throttle
valve.
• The PCM checks the difference between the
actual engine speed and the target engine speed.
.
DESCRIPTIONS OF MONITOR METHODS
Difference between actual and target idle speed is
over the specified value.
.
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)
• Misfire monitor
• Exhaust gas recirculation (EGR) system monitor
• Fuel system monitor
Sensor (The sensor below is determined to be
normal)
• 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-794
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Vehicle speed has reached 1.5 km/h (1.0 mph) or
more at least once.
• Under the closed loop idle speed control.
• Engine coolant temperature is higher than 77°C
(171
°F).
• Battery positive voltage is higher than 10 volts.
• Barometric pressure is higher than 76 kPa (22.4
in.Hg).
• Intake air temperature is higher than −10°C
(14
°F).
• 60 seconds have elapsed from the start of the
previous monitoring.
• Target throttle actuator control motor position is 0
steps.
Judgment Criteria
• Actual idle speed has continued to be higher than
the target idle speed by 200 r/min (300 r/min*) or
more for 12 seconds.
*: Specs in parentheses are applicable if the max-
imum air temperature during the previous
operation was more than 45
°C (113°F).
.
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: )
• Intake system vacuum leak.
• PCM failed.
• Throttle body assy failed.
END
NO
NO
NO
YES
YES
YES
MALFUNCTION
GOOD
START
CALCULATE
Ne
MONITORING
CONDITIONS
Ne = (ACTUAL-Ne) - (TARGET-Ne)
Ne: ENGINE SPEED
Ne < -100 r/min OR
> 200 r/min
HAVE 12secs PASSED?
AK302408
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-795
DIAGNOSIS
Required Special Tools
• MB991958: Scan tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
STEP 1. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) After the DTC has been deleted, read th eDTC again.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the diagnostic trouble code other than P0507 set?
YES : Refer to Diagnostic Trouble Code Chart
NO : Go to Step 2.
STEP 2. Check the intake system vacuum leak.
Q: Are there any abnormalities?
YES : Repair or replace it. Then go to Step 4.
NO : Go to Step 3.
STEP 3. Replace the throttlre body assembly.
(1) Replace the throttle body assembly .
(2) Turn the ignition switch to the " ON " position.
(3) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the " LOCK " (OFF) position.
Q: Is DTC P0507 set?
YES : Replace the PCM. Then go to Step 4.
NO : The procegure is complete.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-796
STEP 4. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Procedure 6
− Other Monitor
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0507 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0513: Immobilizer Malfunction
.
TECHNICAL DESCRIPTION
• PCM monitors the communication condition with
the immobilizer-ECU. When an abnormality in
communication is found, PCM prevents engine
start.
.
DTC SET CONDITIONS
Check Conditions
• Ignition switch: ON
Judgment Criteria
• When the communication error between PCM
and the immobilizer-ECU continues for 2 seconds
or more.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Malfunction of harness or connector.
• Malfunction of immobilizer-ECU.
• Malfunction of PCM.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
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