Mitsubishi Lancer Evolution X. Manual — part 381
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-589
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. 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) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the diagnostic trouble code other than P1238 set?
YES : Refer to, Diagnostic Trouble Code Chart
NO : Go to Step 2.
STEP 2. Using scan tool MB991958, check data list item 10:
Mass Airflow Sensor.
(1) Start the engine and run at idle.
(2) Set scan tool MB991958 to the data reading mode for item
10, Mass Airflow Sensor.
(3) Warm up the engine to normal operating temperature: 80° C
to 95° C (176° F to 203° F).
• The standard value during idling should be between
1,350 and 1,670 millivolts.
• When the engine is revved, the mass airflow rate should
increase according to the increase in engine speed.
(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 P0101 − Mass Airflow Circuit
Range/Performance Problem
, DTC P0102
− Mass Airflow Circuit Low Input
, DTC
P0103 − Mass Airflow Circuit High Input
.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-590
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 − Pattern 16
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P1238 set?
YES : Replace the ECM. When the ECM is replaced,
register the ID code. Refer to GROUP 42B, ID Code
Registration Necessity Judgment Table <Vehicles
with KOS>
or GROUP 42C, ID Codes
Registration Judgment Table <Vehicles with WCM>
. Then go to Step 4.
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
.
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 − Pattern 16
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P1238 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P1239: Engine RPM Plausibility
.
TECHNICAL DESCRIPTION
Compares the actual engine speed calculated from
the crankshaft position sensor signal cycle with the
estimated engine speed calculated from the number
of the crankshaft position sensor signal pulses after a
lapse of the specified time.
.
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)
• Not applicable
.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-591
DTC SET CONDITIONS
Logic Flow Chart
Check Condition
• The engine speed monitored with a 180 degree-
cycle pulse is 500 r/min or more.
Judgment Criterion
• The difference between the engine speed moni-
tored with a 180 degree-cycle pulse and the
engine speed monitored with a 10 degree-cycle
pulse is 500 r/min or more.
Check Condition
• The engine speed monitored with a 180 degree-
cycle pulse is 500 r/min or less.
Judgment Criterion
• The engine speed monitored with a 10 degree-
cycle pulse is 1,000 r/min or more.
.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree position is in default
position.
.
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:)
• Crankshaft position sensor system failed.
• ECM failed.
AK604355
Start
End
No
No
No
Yes
Yes
Yes
Yes
No
Malfunction
Good
|Ne (180˚)-Ne (10˚)|
>= 500r/min
Ne (180˚) >= 500r/min
Ne (10˚) > 1000r/min
Continuous
failure for 0.5sec
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-592
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. 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) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the diagnostic trouble code other than P1239 set?
YES : Refer to, Diagnostic Trouble Code Chart
NO : Go to Step 2.
STEP 2. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
(1) Turn the ignition switch to the "ON" position.
(2) After the DTC has been deleted, read the DTC again.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P1239 set?
YES : Replace the ECM. When the ECM is replaced,
register the ID code. Refer to GROUP 42B, ID Code
Registration Necessity Judgment Table <Vehicles
with KOS>
or GROUP 42C, ID Codes
Registration Judgment Table <Vehicles with WCM>
. Then go to Step 3.
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
.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
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