Mitsubishi Montero (2004+). Manual — part 291
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-651
NOTE: Check harness after checking intermediate connectors
E-113, D-111 and F-07. If intermediate connectors are dam-
aged, repair or replace them. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 6.
Q: Is the harness wire in good condition?
YES : Go to Step 5.
NO : Repair it. Then go to Step 6.
STEP 5. Retest the system.
(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 P0461 set?
YES : Replace the PCM. Then go to Step 6.
NO : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
STEP 6. Perform 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 P0461 is set?
YES : Repeat the troubleshooting.
NO : The procedure is complete.
DTC P0506: Idle Control Sytem RPM Lower Than Expected
.
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)
• Volume 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-652
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Under the closed loop idle speed control.
• The engine coolant temperature is more than
77
°C (171°F).
• Battery positive voltage is higher than 10 volts.
• Power steering pressure switch: "OFF".
• Volumetric efficiency is lower than 40 percent.
• 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
more than 255 steps.
Judgment Criteria
• The actual idle speed is more than 100 r/min
lower than the target idle speed for 12 seconds.
.
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: )
• Throttole valve area is dirty.
• PCM 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 10secs PASSED?
AK302956
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-653
DIAGNOSIS
Required Special Tools:
• MB991958: Scan tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
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) Set scan tool MB991958, read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the diagnostic trouble code other than P0506 set?
YES : Refer to Diagnostic Trouble Code Chart
NO : Go to Step 2.
STEP 2. Check the throttle body. (throttle valve area)
Q: Is the throttle valve area dirty?
YES : Perform cleaning. Refer to throttle body (throttle valve
area) cleaning
. Then go to Step 4.
NO : Go to Step 3.
STEP 3. 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 P0506 set?
YES : Replace the PCM. Then go to Step 4.
NO : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspectuin Service Points
AK302970
AB
MB991911
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-654
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
.
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)
• Volume airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
• Throttle position sensor
.
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