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.