Mitsubishi Outlander GS45X. Manual — part 631
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-347
DTC SET CONDITIONS
Logic Flow Chart
Calculate crankshaft
angular acceleration (An)
Misfire
Calculate percent misfire (R
MF
)
End
No
No
No
No
No
No
Yes
Good
Within 1000rev
Malfunction
(exceed std × 1.5)
Good
Malfunction (catalytic
converter is damaged.)
Good
Calculate percent misfire (R
MF
)
Within 200rev
Ne
Ec : Charge efficiency
TH
MF
: Threshold value for misfire
TH
CD
: Threshold value for catalyst damage
AK800585
Start
Yes
Yes
Yes
Yes
Yes
Monitoring
conditions
An < TH
MF
(Ne, Ec)
R
MF
>= specified value
R
MF
>= TH
CD
(Ne, Ec)
: Engine speed
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-348
Check Conditions
• Engine speed is between 438 and 6,594 r/min.
• Engine coolant temperature is higher than −10°C
(14
°F).
• Barometric pressure is higher than 76 kPa (22.4
in.Hg).
• The engine load is with in the positive torque
load.
• Adaptive learning is complete for the vane which
generates a crankshaft position signal.
• While the engine is running, excluding sudden
acceleration/deceleration and fuel shut-off opera-
tion.
Judgement Criterion (change in the angular
acceleration of the crankshaft is used for mis-
fire detection)
• Misfire has occurred more frequently than
allowed during the last 200 revolutions [when the
catalyst temperature is higher than 1,000
°C
(1,832
°F)].
or
• Misfire has occurred in 2.0 percent 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 −
Pattern 15
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Included air due to lack of fuel
• Ignition system related part(s) failed.
• Crankshaft position sensor failed.
• Incorrect air/fuel ratio.
• Low compression pressure.
• Skipping of timing belt teeth.
• EGR system and EGR valve failed.
• ECM failed.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
STEP 1. Check whether air is included due to the lack of
fuel or not.
• Check whether users have experienced the lack of fuel or
not.
Q: Has the user ever experienced the lack of fuel?
YES : Erase the diagnosis codes to finish the check.
NO : Go to Step 2.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-349
STEP 2. Using scan tool MB991958, check data list item 2:
Crankshaft Position Sensor.
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) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item
2, Crankshaft Position Sensor.
• The tachometer and engine speed indicated on the scan
tool should match.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : Go to Step 3.
NO : Refer to, DTC P0335
− Crankshaft Position Sensor
Circuit
STEP 3. Using scan tool MB991958, check data list item 26:
Long-Term Fuel Trim.
(1) Start the engine and run at idle.
(2) Set scan tool MB991958 to the data reading mode for item
26, Long-Term Fuel Trim.
• The fuel trim should be between −12.5 and +12.5 per-
cent when the engine is 2,500 r/min (during closed loop)
after the engine is warmed.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the specification normal?
YES : Go to Step 4.
NO : Refer to DTC P0171
− System too Lean
,
DTC P0172
− System too Rich
.
STEP 4. Using scan tool MB991958, check data list item 28:
Short-Term Fuel Trim.
(1) Start the engine and run at idle.
(2) Set scan tool MB991958 to the data reading mode for item
28, Short-Term Fuel Trim.
• The fuel trim should be between −7.4 and +7.4 percent
when the engine is 2,500 r/min (during closed loop) after
the engine is warmed.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the specification normal?
YES : Go to Step 5.
NO : Refer to DTC P0171
− System too Lean
,
DTC P0172
− System too Rich
.
AK700568AB
MB991824
MB991827
MB991910
Data link
connector
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-350
STEP 5. Visual check of ignition spark.
(1) Remove the spark plug and install it to the ignition coil.
(2) Connect the ignition coil connector.
(3) Remove all injector connector.
(4) At the engine start, check each spark plug produces a
spark.
Q: Did it spark?
YES : Go to Step 7.
NO : Go to Step 6.
STEP 6. Check the spark plugs.
Refer to GROUP 16, Ignition System
− On-vehicle Service −
Spark Plug Check And Cleaning.
Q: Is the spark plug normal?
YES : Refer to Symptom Procedures 24
− Ignition Circuit
System
NO : Replace the faulty spark plug. Then go to Step 9.
STEP 7. 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 9.
NO : Go to Step 8.
STEP 8. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− OBD-II Drive Cycle − Pattern 15
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0300 set?
YES : Replace the ECM. When the ECM is replaced,
register the ID code. Refer to GROUP 42B, Diagnosis
− ID Code Registration Judgment Table <Vehicles
or GROUP 42C, Diagnosis
− ID
Codes Registration Judgment Table <Vehicles with
WCM>
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
AC
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