Mitsubishi Outlander GS45X. Manual — part 868
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-405
STEP 4. Using scan tool MB991958, check data list item 15:
Throttle Position Sensor (sub).
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) Detach the intake air hose at the throttle body.
(4) Disconnect the connector of the throttle position sensor.
(5) Use test harness special tool (MB991658) to connect only
terminals No. 3, No. 4, No. 5, and No. 6.
(6) Set scan tool MB991958 to the data reading mode for item
15, Throttle Position Sensor (sub).
• Output voltage should be 4.0 volts or more when the
throttle valve is fully closed with your finger.
• Output voltage should be 1.0 volt or less when the throt-
tle valve is fully open with your finger.
(7) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : 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
.
NO : Go to Step 5.
STEP 5. Replace the throttle 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 P0223 set?
YES : Replace the ECM. When the ECM is replaced,
register the ID code. Refer to GROUP 42B, Diagnosis
− ID Codes Registration Judgment Table <Vehicles
or GROUP 42C, Diagnosis
− ID
Codes Registration Judgment Table <Vehicles with
WCM>
NO : The inspection is complete.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-406
STEP 6. 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 the DTC again.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P0223 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0300: Random/Multiple Cylinder Misfire Detected
.
TECHNICAL DESCRIPTION
• If a misfire occurs while the engine is running, the
engine speed changes for an instant.
• The ECM 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) <3.0L ENGINE>
13B-407
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Engine speed is between 438 and 6,500 r/min.
• Engine coolant temperature is higher than −10°C
(14
°F).
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) <3.0L ENGINE>
13B-408
• 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
• The occurrence rate of engine misfiring within the
1,000 engine revolutions is more than 1.7 %
<Except for California> or 1.8 % <California>.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
.
.
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.
• Poor crankshaft position sensor.
• Incorrect air/fuel ratio.
• Spark plug failed.
• Low compression pressure.
• Skipping of timing belt teeth.
• EGR valve (stopper motor) 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
• MB992110: Power Plant ECU Check Harness
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.
STEP 2. Check the EGR system
Refer to GROUP 17, Emission Control
− Exhaust Gas Recircu-
lation (EGR) System
− General Information (Exhaust Gas
Q: Are there any abnormalities?
YES : Replace the EGR valve (stopper motor). Then go to
Step 10.
NO : Go to Step 3.
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