Mitsubishi Lancer (4A9 engine). Manual — part 16

PRECAUTIONS BEFORE SERVICE

GENERAL

00-61

INJECTOR IDENTIFICATION CODE REGISTRATION PROCEDURE <4N1>

M1001012600220

CAUTION

1. If the injector identification code is not regis-

tered, the engine warning lamp goes on and
diagnosis code No. P1626 is logged.

2. Failure to register the injector identification

code correctly will cause rough idling, abnor-
mal noise, and emission deterioration.

PURPOSE

AK802951AB

Identification code

Because individual injectors have different injection
characteristics, the engine-ECU corrects injection
time for each cylinder to improve injection accuracy.
For this reason, when the injector or engine-ECU is
replaced, injector correction data must be registered
afterwards in the engine-ECU using the M.U.T.-III.
Correction data is converted into an identification
code consisting of 30 alphanumeric characters and
printed on the injector connector.

REGISTRATION PROCEDURE (DURING
ENGINE ECU REPLACEMENT)

CAUTION

To prevent damage to M.U.T.-III, always turn the
ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting M.U.T.-III.

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.

PRECAUTIONS BEFORE SERVICE

GENERAL

00-62

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 "Inj.ID Writing (Exchanging ECU)" from

Special Function Screen.

6. Select "Injector ID Read&Save" from Inj.ID Writing

(Exchanging ECU) Screen to read data from the
current engine-ECU and save the data.

NOTE: If the injector identification code cannot be
read and cannot be stored from the engine ECU that
is not replaced yet, register the identification code in
the same procedures as the injector replacement.
7. Turn the ignition switch to the "LOCK" (OFF)

position.

8. Replace the engine-ECU.
9. Turn the ignition switch to the "ON" position.
10.Select "MPI/GDI/DIESEL" from System select

Screen of the M.U.T.-III.

11.Select "Special Function" from MPI/GDI/DIESEL

Screen.

12.Select "Inj.ID Writing (Exchanging ECU)" from

Special Function Screen.

13.Select "Saved Injector ID Writing " from Inj.ID

Writing (Exchanging ECU) Screen to write the
data, which was saved previously, to the engine-
ECU.

NOTE: When the registration is completed, the lit
engine warning lamp begins to blink.
14.Execute small injection quantity learning (Refer to

P.00-63

).

15.Confirm that the engine warning lamp is off.

Confirm also that the diagnosis code is not stored.

REGISTRATION PROCEDURE (DURING
INJECTOR REPLACEMENT)

NOTE: If the injector identification code cannot be
read when the engine-ECU is replaced, input the
identification code in the following procedures:

CAUTION

To prevent damage to M.U.T.-III, always turn the
ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting M.U.T.-III.

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.

PRECAUTIONS BEFORE SERVICE

GENERAL

00-63

5. Select "Inj.ID Writing (Exchanging INJ.)" from

Special Function Screen.

6. From the Inj.ID Writing (Exchanging INJ.) Screen,

select the injector to which the identification code
is registered.

Content

M.U.T.-III registered
items

No. 1 injector only
registered

No. 1 Injector ID Writing

No. 2 injector only
registered

No. 2 Injector ID Writing

No. 3 injector only
registered

No. 3 Injector ID Writing

No. 4 injector only
registered

No. 4 Injector ID Writing

All injector registered

All Injectors ID Writing

CAUTION

Even if the number of the cylinder to be regis-
tered does not match the actual injector mount-
ing location, registration ends normally. Specify
the cylinder number correctly.

AK802952

Frame 1

(4 digits)

Frame 3

(4 digits)

Frame 5

(4 digits)

Frame 7

(4 digits)

Frame 2

(4 digits)

Frame 4

(4 digits)

Frame 6

(4 digits)

Frame 8

(4 digits)

AB

7. Register the injector identification code. Input the

identification code printed on the upper plane of
the injector.

NOTE: The identification code is divided into eight
parts. Input the identification code into the specified
parts.
8. Push "OK" to register it.
NOTE: When the registration is completed, the lit
engine warning lamp should begin to blink.
9. Execute small injection quantity learning (Refer to

P.00-63

).

NOTE: When the injector is replaced, executing the
write operation clears the values of small injection
quantity learning.
10.Confirm that the engine warning lamp is off.

Confirm also that the diagnosis code is not stored.

SMALL INJECTION QUANTITY LEARNING PROCEDURE <4N1>

M1001014300300

CAUTION

1. If small injection quantity learning has not

been executed, the engine warning lamp
blinks.

2. When the requirements for learning are satis-

fied by operation after replacement of the
engine-ECU, learning is automatically exe-
cuted even if no instruction is given from the
M.U.T.-III. Accordingly, the malfunction indica-
tor lamp goes off. However, the learning thus
executed is tentative and limited. Be sure to
complete leaning using the M.U.T.-III.

PURPOSE

To keep emission and noise level at adequate levels,
the engine-ECU must learn injector fuel injection in
idle mode.

During learning, the engine-ECU calculates actual
injection from each cylinder based on changes in
engine speeds and corrects pilot injection control. It
then keeps records of this amount of correction as a
learned value.
For this reason, after the engine-ECU or injector is
replaced, learning must be executed using the
M.U.T.-III.

PRECAUTIONS BEFORE SERVICE

GENERAL

00-64

NOTE: Engine friction changes or injector deteriora-
tion over time may cause fluctuation in pilot injection.
After use over time, it may prevent injection of an
accurate amount of fuel according to the indication
by the engine-ECU. This is why learning must be
executed again periodically.
For this reason, the engine-ECU periodically leans
injection according to the cumulative mileage.
Note that making the M.U.T.-III learn again resets the
cumulative mileage.
NOTE: The engine sound may change or idling
engine speeds may increase during injection learn-
ing. These are not abnormalities.

LEARNING PROCEDURE

CAUTION

To prevent damage to M.U.T.-III, always turn the
ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting M.U.T.-III.

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. Put the vehicle in the following idling stable

conditions:

• Engine coolant temperature: 76 − 100°C

• Fuel temperature: 30 − 100°C