Mitsubishi Eclipse. Manual — part 223
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-385
STEP 9. Using the oscilloscope, check the injector.
(1) Disconnect the injector connector B-01 <No.1 cylinder> or
B-02 <No.2 cylinder> or B-05 <No.3 cylinder> or B-06
<No.4 cylinder> and connect the test harness special tool
(MB991348) in between. (All terminals should be
connected.)
(2) Connect the oscilloscope probe to the injector side
connector terminal No. 2.
NOTE: When measuring with the ECM or PCM side con-
nector, connect an oscilloscope probe to the each of the fol-
lowing terminals.
.
•
ECM terminal No. 1 or PCM terminal No. 1 when check-
ing No. 1 cylinder.
•
ECM terminal No. 14 or PCM terminal No. 9 when
checking No. 2 cylinder.
•
ECM terminal No. 2 or PCM terminal No. 24 when
checking No. 3 cylinder.
•
ECM terminal No. 15 or PCM terminal No. 2 when
checking No. 4 cylinder.
(3) Start the engine and run at idle.
(4) Measure the waveform.
• The waveform should show a normal pattern similar to
the illustration.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the waveform normal?
YES : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
NO : Replace the ECM or PCM. Then go to Step 10.
STEP 10. 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: Are DTC P0201, P0202, P0203 and P0204 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
AK102980
1 2
INJECTOR
CONNECTOR
MB991348
AB
OSCILLOSCOPE
AKX01557 AB
A
NORMAL WAVEFORM
A:INJECTOR DRIVE TIME
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-386
DTC P0300: Random/Multiple Cylinder Misfire Detected
.
Random Misfire Circuit
• Refer to, DTC P0201 − P0204 Injector Circuit
Malfunction
.
CIRCUIT OPERATION
• Refer to, DTC P0201 − P0204 Injector Circuit
Malfunction
.
TECHNICAL DESCRIPTION
• If a misfire occurs while the engine is running, the
engine speed changes for an instant.
• The ECM <M/T> or PCM <A/T> 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
• 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) <2.4L>
13A-387
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Engine speed is between 500 and 6,000 r/min.
• Engine coolant temperature is higher than −10°C
(14
°F).
• Barometric pressure is higher than 76 kPa (22.4
in.Hg).
• 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 volt/10 ms to +0.06
volt/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
(DAMAGE THE CAT.)
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) <2.4L>
13A-388
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
(1742
°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-ll DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-ll 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.
• Skipping of timing belt teeth.
• Harness damage in injector circuit, or connector
damage.
• Injector failed.
• ECM failed. <M/T>
• PCM failed. <A/T>
DIAGNOSIS
Required Special Tools:
• MB991958 (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
STEP 1. Using scan tool MB991958, check data list item 22:
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
22, Crankshaft Position Sensor.
(4) Check the waveform of the crankshaft position sensor while
keeping the engine speed constant.
• The pulse width should be constant.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : Go to Step 2.
NO : Refer to, DTC P0335
− Crankshaft Position Sensor
Circuit Malfunction
.
AK300810
AB
MB991911
16-PIN
MB991827
MB991824
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