Mitsubishi Evolution X. Manual - part 314

PRECAUTIONS BEFORE SERVICE

TSB Revision

GENERAL

00-31

10.Select "VIN Writing" on "Coding" screen.

11.Push the OK button after the VIN written in the engine 

control module is displayed.

12.Push the OK button after "VIN Writing will start. Are you 

sure?" is displayed.

13.Push the OK button after "Completed." is displayed.

14.Result of VIN writing is displayed.
15.Resister the other ID code. (Refer to GROUP 42B, 

Troubleshooting 

− ID Code Registration Judgment Table 

P.42B-12

 <Vehicles with KOS> or GROUP 42C, 

Troubleshooting 

− ID Code Registration Judgment Table 

P.42C-9

 <Vehicles with WCM>.)

INITIALIZATION PROCEDURE FOR LEARNING 
VALUE IN MFI ENGINE

M1001011700826

When the following service is performed, initialize the learning 
value.

• At replacing engine assembly

• At replacing throttle body and at cleaning

• At replacing knock sensor

.

INITIALIZATION PROCEDURE

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

System Select

Please select function.

F.A.S.T./IMMOBI/Keyless/TPMS

Coding

VIN Writing

AC609799

AB

Press the OK button to execute.

VIN Writing

VIN currently written in ECM is displayed.

Write the number displayed on the screen in Immobilizer KOS/ECU.

VIN (Engine ECU)

00000000000000000

Coding

VIN Writing

F.A.S.T./IMMOBI/Keyless/TPMS

AC609798

OK button

AB

F.A.S.T./IMMOBI/Keyless/TPMS

Coding

VIN Writing

Result of VIN Writing

VIN Writing

00000000000000000

AC609285

AB

PRECAUTIONS BEFORE SERVICE

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GENERAL

00-32

CAUTION

• To prevent damage to scan tool MB991958, always turn 

the ignition switch to the "LOCK" (OFF) position before 
connecting or disconnecting scan tool MB991958.

• When the learning value for MFI engine is initialized, 

the initial learning value for engine timing chain elonga-
tion is also initialized. Thus, the initial learning value for 
timing chain elongation must be stored in scan tool 
MB991958 before working. If the initial learning value 
for timing chain elongation is not stored and the learn-
ing value for MFI engine is initialized, the visual check 
of the timing chain elongation must be carried out 
(Refer to GROUP 11A, Engine Mechanical 

− On-vehicle 

Service 

− Timing Chain Elongation Visual Check 

P.11A-17

). At that time, if the timing chain elongates 

more than the specified value, the timing chain can 
possibly interfere the other parts and damage the 
engine before the ECM detects the timing chain elonga-
tion.

NOTE: When the engine ASSY is replaced, the timing chain is 
simultaneously replaced. Thus, it is not necessary to perform 
Step 3 and 9.
1. After the ignition switch is in "LOCK" (OFF) position, connect 

scan tool MB991958 to the diagnosis connector.

2. Turn the ignition switch to the "ON" position.
3. The initial learning value for timing chain elongation must be 

stored in scan tool MB991958 (Refer to Timing Chain 
Maintenance 

P.00-33

).

4. Select "MFI" from System select Screen of scan tool 

MB991958.

5. Select "Special Function" from MFI Screen.
6. Select "Learned value reset" from Special Function Screen.
7. Select "All learned value" from Learned value reset Screen
8. Initialize the learning value by pressing the "OK" button.
9. The stored initial learning value for timing chain elongation 

during Step 3 must be written into the ECM (Refer to Timing 
Chain Maintenance 

P.00-33

).

10.After initializing the learning value, the learning value of MFI 

engine idling is necessary.  (Refer to Learning Procedure 
For Idling In MFI Engine 

P.00-32

).

ENGINE IDLING LEARNING PROCEDURE

M1001011800920

PURPOSE

When the ECM is replaced, or when the learned value is initial-
ized, the idle may not be stabilized. Carry out the learning 
method by following the procedures below.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

PRECAUTIONS BEFORE SERVICE

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GENERAL

00-33

LEARNING PROCEDURE

1. Start the engine and warm to reach 80

° C (176° F) or more.

NOTE: When the engine coolant temperature is 80

°

C 

(176

°

F) or more, the warm-up is not needed if the ignition 

switch is in "ON" position once.

2. Turn the ignition switch to "LOCK" (OFF) position.
3. After 10 seconds or more, start the engine again.
4. For 10 minutes, carry out the idling under the condition 

shown below and then confirm the engine idles normally.

• Transaxle: Neutral (P range on vehicles with TC-SST)

• Operation in ignition-related, fan and attachments: Not to be 

operated

• Engine coolant temperature: 80° C (176° F) or more

NOTE: If the engine stalls while idling, check for a dirty (on 
the throttle valve) of the throttle body and clean if needed. 
Then perform the service from Procedure 1 again.

INITIALIZATION PROCEDURE FOR THROTTLE 
ACTUATOR CONTROL MOTOR

When the battery cable is disconnected and reconnected, throt-
tle actuator control motor valve (Fully closed position) is elimi-
nated, so that the throttle valve opening angle control would not 
be performed correctly. When the battery cable is disconnected 
and reconnected, initialize the throttle actuator control motor 
using the following procedure.
1. Turn the ignition switch to the "ON" position then, turn the 

ignition switch to "LOCK" (OFF) position.

2. For 10 seconds or more, keep the ignition switch in "LOCK" 

(OFF) position.

TIMING CHAIN MAINTENANCE

M1001016500021

.

If the vehicle equipped with 4B11-T/C engine continues 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 
timing chain is integrated into the ECM. When the ECM detects 
the elongation of the timing chain, the warning is shown on the 
multi-information display of combination meter as shown in the 
illustration. This gives the driver the information that the visual 
check of the elongation of the timing chain is necessary. If this 
warning is continuously neglected, the timing chain can possi-
bly interfere with the other engine components, resulting in the 
engine damaged.
NOTE: *1: The competitive running means the running that 
constantly repeats the cycle of the full opened position of the 
accelerator pedal and the full closed position of the accelerator 
pedal.

AK704218

PRECAUTIONS BEFORE SERVICE

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GENERAL

00-34

The ECM stores the timing chain conditions as the learning value when the timing chain is installed. The ECM 
stores the amount of elongation of the timing chain in the EEPROM as the current learning value, compared 
with the learning value. The ECM judges that the visual check of the elongation of the timing chain is neces-
sary when the current learning value exceeds the specified value. Thus, use the scan tool MB991958 to 
always carry out the maintenance of the learning value related to the timing chain that is stored by the ECM 
after the following service.

NOTE: 

*2

: The visual check of the elongation of the timing chain must be carried out using the scan tool 

MB991958 under the following conditions (Refer to GROUP 11A, Engine Mechanical 

−

 On-vehicle Service 

−

 

Timing Chain Elongation Visual Check 

P.11A-17

). When the initial value cannot be written into the new ECM 

because of the ECM malfunction.

LEARNED VALUE READ&SAVE AND WRITE 
LEARNED VALUE (CHANGED ECU)

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

Service

Maintenance items 
by scan tool 
MB991958

Maintenance purpose

ECM replacement

• Learned value 

Read&Save

 *2

 

• Write learned 

value (Changed 
ECU)

*2

The purpose is that the initial value regarding the amount of 
elongation of the timing chain stored by the current ECM is 
loaded in the scan tool MB991958, and then written into the 
new ECM. This allows the ECM to appropriately monitor the 
amount of elongation of the timing chain after the ECM 
replacement.

Visual check of 
elongation of timing 
chain

Learned value reset

The purpose is that the initial value stored by the current 
ECM is initialized after the visual check of the elongation of 
the timing chain by illuminating the warning lamp, whether or 
not the timing chain is replaced.

Timing chain or 
engine ASSY 
replaced

Learned value reset

The purpose of this procedure is that the initial learning value 
stored by the current ECM is initialized when the timing chain 
or the engine ASSY (the timing chain is also replaced with a 
new one.) is replaced. This allows the ECM to appropriately 
monitor the amount of elongation of the timing chain.

Initializing learning 
value for MFI engine

• Learned value 

Read&Save

• Write learned 

value (Changed 
ECU)

When learning value for MFI engine is initialized, initial 
learning value for timing chain elongation is also initialized. 
Thus, initial learning value for timing chain elongation must 
be stored before initializing learning value for MFI engine.