Mitsubishi Lancer (4A9 engine). Manual — part 18
AC608435
MB991827
MB991824
MB991910
AB
Diagnosis connector
<LH drive vehicles>
AC700191
MB991827
MB991824
AB
Diagnosis connector
<RH drive vehicles>
MB991910
PRECAUTIONS BEFORE SERVICE
GENERAL
00-69
4. Connect the M.U.T.-III to the diagnosis connector
(But do not start the engine).
5. Turn the ignition switch to the ON position.
6. Select "MPI/GDI/DIESEL" from System select
Screen of the M.U.T.-III.
7. Select "Special Function" from MPI/GDI/DIESEL
Screen.
8. Select "Learning" from Special Function Screen.
9. Select "Battery current SNSR.calibration" from
Learning Screen.
10.Start the calibration by pressing the "OK" button.
11.Confirm that the M.U.T.-III data list item No. 119
<Low CO
2
specification, FFV> No. 452 <4N1>
Battery current sensor calibration is "Completed".
12.After the ignition switch is in "LOCK" (OFF)
position, disconnect the M.U.T.-III.
13.Install the battery current sensor.
FORCED LEARNING OF ESTIMATED
ETHANOL CONCENTRATION <FFV>
M1001018200048
PURPOSE
When carrying out the learning of the estimated etha-
nol concentration every time the engine starts or the
fuel is supplied, the Flexible Fuel Vehicle (FFV) con-
trols the injection amount according to the ethanol
concentration in the fuel tank. The difference, how-
ever, arises between the ethanol concentration
stored by the engine-ECU and the actual ethanol
concentration when performing the following driving
or work. This can possibly impact on the poor cold
engine starting or the drivability in the cold state.
Using the M.U.T.-III, this malfunction can be solved
by carrying out the forced learning of the estimated
ethanol concentration.
• Repeating the short distance run that cannot
switch to the estimating concentration mode.
• Replacing the fuel of the fuel tank
• Outputting the diagnosis code
• Replacing the fuel gauge unit and the fuel supply
line
• Replacing the engine-ECU
PRECAUTIONS BEFORE SERVICE
GENERAL
00-70
LEARNING PROCEDURE
AC608435
MB991827
MB991824
MB991910
AB
Diagnosis connector
<LH drive vehicles>
AC700191
MB991827
MB991824
AB
Diagnosis connector
<RH drive vehicles>
MB991910
NOTE: Confirm that the diagnosis code is not output
by the engine-ECU before performing the forced
learning of the estimated ethanol concentration. If
the diagnosis code is output, carry out the work after
solving the malfunction.
1. After the ignition switch is in "LOCK" (OFF)
position, connect the M.U.T.-III to the diagnosis
connector.
2. After confirming that the engine control relay is in
the OFF position, start the engine.
3. Select "MPI/GDI/DIESEL" from System select
Screen of the M.U.T.-III.
4. Select "Special Function" from MPI/GDI/DIESEL
Screen.
5. Select "Learning" from Special Function Screen.
6. Select "Ethanol forced learning mode" from
Learning Screen
7. Press the "OK" button and drive the vehicle for
approximately 15 minutes.
8. Confirm that the M.U.T.-III data list item No. 120
Ethanol percentage learning is "Completed". If it is
"Not completed", drive the vehicle for several
minutes more.
TIMING CHAIN MAINTENANCE <4B11-
Turbo>
M1001016500292
AK800500
If the vehicle equipped with 4B11-turbo engine con-
tinues the rough driving like competitive running
*1
,
the amount of carbon mixed into the engine oil tends
to increase. This can possibly cause the timing chain
to gradually elongate. To prevent this, the function or
logic monitoring the amount of elongation of the tim-
ing chain is integrated into the engine-ECU. When
the engine-ECU detects the elongation of the timing
chain, the warning is shown on the multi-information
display of combination meter as shown in the illustra-
tion. This gives the driver the information that the vis-
ual check of the elongation of the timing chain is
necessary. If this warning is continuously neglected,
the timing chain can possibly interfere with the other
engine components, resulting in the engine dam-
aged.
NOTE: *1: The competitive running means the run-
ning that constantly repeats the cycle of the full
opened position of the accelerator pedal and the full
closed position of the accelerator pedal.
PRECAUTIONS BEFORE SERVICE
GENERAL
00-71
The engine-ECU stores the timing chain conditions as the initial learning value when the timing chain is
installed. The engine-ECU stores the amount of elongation of the timing chain in the EEPROM as the current
learning value, compared with the initial learning value. The engine-ECU judges that the visual check of the
elongation of the timing chain is necessary when the current learning value exceeds the specified value.
Thus, use the M.U.T.-III to always carry out the maintenance of the initial learning value related to the timing
chain that is stored by the engine-ECU after the following service.
Service
Maintenance items
by M.U.T.-III
Maintenance purpose
Engine-ECU
replacement
• Learned value
Read&Save
*2
• Write learned
value (Changed
ECU)
*2
The purpose is that the initial learning value regarding the
amount of elongation of the timing chain stored by the current
engine-ECU is loaded in the M.U.T.-III, and then written into
the new engine-ECU. This allows the engine-ECU to
appropriately monitor the amount of elongation of the timing
chain after the engine-ECU replacement.
Visual check of
elongation of timing
chain
Learned value reset
The purpose is that the initial learning value stored by the
current engine-ECU is initialised after the visual check of the
elongation of the timing chain by illuminating the warning
lamp, whether or not the timing chain is replaced. This allows
the engine-ECU to appropriately monitor the amount of
elongation of the timing chain.
Timing chain or
engine assembly
replaced
Learned value reset
The purpose of this procedure is that the initial learning value
stored by the current engine-ECU is initialised when the
timing chain or the engine assembly (the timing chain is also
replaced with a new one.) is replaced. This allows the
engine-ECU to appropriately monitor the amount of
elongation of the timing chain.
NOTE: *2: The visual check of the elongation of the timing chain must be carried out under the following con-
ditions: when the initial learning value cannot be written into M.U.T.-III from the current engine-ECU because
of the engine-ECU malfunction and when the initial learning value cannot be written into the new engine-ECU
(Refer to GROUP 11I
−
On-vehicle Service
−
Timing Chain Elongation Visual Check ). If elongated more than
the specified length at this time, the timing chain can possibly interferes with the other engine components
before the new engine-ECU detects the elongation of the timing chain. The timing chain must be replaced
with a new one to prevent engine damage.
PRECAUTIONS BEFORE SERVICE
GENERAL
00-72
LEARNED VALUE READ&SAVE AND
WRITE LEARNED VALUE (CHANGED
ECU)
AK800862AB
MB991827
MB991824
MB991910
Diagnosis connector
<L.H. drive vehicles>
AK800863
AB
MB991827
MB991824
Diagnosis connector
<R.H. drive vehicles>
MB991910
1. After the ignition switch is in "LOCK" (OFF)
position, connect the M.U.T.-III to the diagnosis
connector.
2. Turn the ignition switch to the "ON" position.
3. Select "MPI/GDI/DIESEL" from System select
Screen of the M.U.T.-III.
4. Select "Special Function" from MPI/GDI/DIESEL
Screen.
5. Select "Timing chain maintenance" from Special
Function Screen.
6. Select "Learned value Read&Save" from Timing
chain maintenance Screen.
7. Press "OK" to store the initial learning value file.
NOTE: When the initial learning value file is appropri-
ately stored, "Learned value Save Complete" is
shown on the screen of the M.U.T.-III.
NOTE: Calculating the amount of elongation of the
timing chain by the engine-ECU takes the time.
Thus, the file cannot be stored for a while after the
engine-ECU initialisation or replacement.
8. Replace the engine-ECU.
9. Select "Write learned value (Changed ECU)" from
Timing chain maintenance Screen.
10.Select the initial learning value file stored during
Step 7 to write the initial learning value.
NOTE: Use only the initial learning value file stored
during Step 7 without using any other files.
NOTE: When the initial learning value is appropri-
ately written, "Learned value writing Completed." is
shown on the screen of the M.U.T.-III.
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