Mitsubishi Lancer Evolution VI. Manual - part 102

CHASSIS ELECTRICAL – 

Ignition Switch

54-12

REMOVAL SERVICE POINT

A

A

"

STEERING LOCK CYLINDER REMOVAL

1.

Insert the key in the steering lock cylinder and turn it
to the “ACC” position.

2.

Using a cross-tip (+) screwdriver (small) or a similar tool,
push the lock pin of the steering lock cylinder inward
and then remove the steering lock cylinder.

INSPECTION

IGNITION SWITCH CONTINUITY CHECK

Disconncect the ignition switch connector without removing
the ignition switch from the vehicle. Then, check the continuity
between the following terminals.

Ignition key 

Terminal No.

Ignition key 
position

1

2

3

4

5

6

LOCK

ACC

ON

START

KEY REMINDER SWITCH CONTINUITY CHECK

Disconnect the key reminder switch connector with the switch
installed on the vehicle, and then check continuity.

Ignition key

Terminal No.

1

2

Removed

Inserted

Cross-tip (+)
screwdriver

Lock pin

CHASSIS ELECTRICAL – 

Ignition Switch and Immobilizer System

54-13

IGNITION SWITCH AND IMMOBILIZER SYSTEM
<EVOLUTION-VI WITH IMMOBILIZER SYSTEM>

SPECIAL TOOL

Tool

Number

Name

Use

MB991502

MUT-

II

 sub 

assembly

D

Immobilizer system check 
(Diagnosis display using the MUT-

II

)

D

Registration of the ID code

TROUBLESHOOTING

Caution
The ID code should always be re-registered when replacing the immobilizer-ECU.

STANDARD FLOW OF DIAGNOSIS TROUBLESHOOTING

Refer to GROUP 00 – How To Use Troubleshooting/Inspection  Service  Points.

DIAGNOSIS FUNCTION

DIAGNOSIS CODES CHECK

Refer to GROUP 00 – How To Use Troubleshooting/Inspection  Service  Points.

ERASING DIAGNOSIS CODES

Refer to GROUP 00 – How To Use Troubleshooting/Inspection  Service  Points.

Caution
The diagnosis codes which result from disconnecting the battery cables cannot be erased.

INSPECTION CHART FOR DIAGNOSIS CODES

Diagnosis code No.

Inspection items

Reference
page

11

Transponder communication system

54-14

12*

ID code are not the same or are not registered

54-14

21

Communication system between MUT-

II

 and engine-ECU

54-15

31

EEPROM abnormality inside immobilizer-ECU

54-15

NOTE
*: Diagnosis code No. 12 is not recorded.

CHASSIS ELECTRICAL – 

Ignition Switch and Immobilizer System

54-14

INSPECTION PROCEDURE FOR DIAGNOSIS CODES

Code No. 11 Transponder communication system

Probable cause

D

The ID code of the transponder is not sent to the immobilizer-ECU immediately
after the ignition switch is turned to the ON position.

D

When starting the engine, one ignition key’s ID code interferes with another ignition
key’s code.

D

Radio interference of ID codes

D

Malfunction of the transponder

D

Malfunction of the ignition key ring antenna

D

Malfunction of harness or connector

D

Malfunction of the immobilizer-ECU

No

OK

Check the following connectors.
B-100, B-101

NG

Repair

OK

Check trouble symptoms.

NG

Check the harness wire between immo-
bilizer-ECU and key ring antenna.

NG

Repair

OK

Replace the immobilizer-ECU.

NG

Diagnosis codes check

Code No. 12 occurs

To INSPECTION PROCEDURE FOR
DIAGNOSIS CODE No. 12 
(Refer to P.54-14.)

Code No. 11 occurs

Check the continuity of the ignition key
ring antenna. (Refer to P.54-20.)

NG

Replace

Is there another ignition key near the
ignition key that is inserted in the ignition
switch?

Yes

Remove the extra ignition key.

Check trouble symptoms.

Does the engine start using the spare
ignition key which has had the ID code
registered?

OK

Replace the ignition key that does not
work.

Re-register the ID code. 
(Refer to P.54-21.)

NG

Code No. 12 ID code are not the same or are not registered

Probable cause

The ID code which is sent from the transponder is not the same as the ID code
which is registered in the immobilizer-ECU.

D

The ID code in the ignition key being used has not
been properly registered.

D

Malfunction of the immobilizer-ECU

Re-register the ID code.
(Refer to P.54-21.)

Check trouble symptoms.

NG

Replace the immobilizer-ECU.

CHASSIS ELECTRICAL – 

Ignition Switch and Immobilizer System

54-15

Code No. 21 Communication system between MUT-

II

 and

engine-ECU

Probable cause

After the ignition switch is turned to the ON position, the confirmation code is not
received from the engine-ECU within the allowable time, or an abnormal code is received.

D

Malfunction of harness or connector

D

Malfunction of the engine-ECU

D

Malfunction of the immobilizer-ECU

Is diagnosis code No. 54 being gener-
ated by the engine-ECU?

NO

Check the engine-ECU power source
and the earth circuit.
(Refer to GROUP 13A – Troubleshoot-
ing.)

YES

Check the following connectors.
B-100, B-65, B-61

NG

Repair

OK

Check trouble symptoms.

NG

Check the harness wire between
engine-ECU and immobilizer-ECU.

NG

Repair

OK

Check trouble symptoms.

NG

Replace the immobilizer-ECU.

Check trouble symptoms.

NG

Replace the engine-ECU.

Code No. 31 EEPROM abnormality inside immobilizer-
ECU

Probable cause

No data has been written to the EEPROM inside the immobilizer-ECU.

D

Malfunction of the immobilizer-ECU

Check trouble symptoms.

NG

Replace the immobilizer-ECU.