Mitsubishi Lancer Evolution VI. Manual - part 103

CHASSIS ELECTRICAL – 

Ignition Switch and Immobilizer System

54-16

INSPECTION CHART FOR TROUBLE SYMPTOMS

Trouble symptom

Inspection procedure No.

Reference page

Communication with MUT-

II

 is impossible.

1

54-16

ID code cannot be registered using the MUT-

II

.

2

54-17

Engine does not start (Cranking but no initial combustion).

3

54-17

Malfunction of the immobilizer-ECU power source and earth circuit

4

54-18

INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS

Inspection Procedure 1

Communication with MUT-

II

 is impossible.

Probable cause

The cause is probably that a malfunction of the diagnosis line or the immobilizer-ECU
is not functioning.

D

Malfunction of the diagnosis line

D

Malfunction of harness or connector

D

Malfunction of the immobilizer-ECU

Can the MUT-

II

 communicate with the

engine-ECU?

NO

Check the following connectors.
B-100, B-22

NG

Repair

YES

Check the immobilizer-ECU connector
B-100.
(Short-circuited harness wire between
terminal No. 13 and No. 14)

NG

Repair

OK

Check trouble symptoms.

NG

Check the harness wire between immo-
bilizer-ECU and diagnosis connector.

NG

Repair

OK

Check the immobilizer-ECU power sup-
ply and earth circuit. (Refer to INSPEC-
TION PROCEDURE 4.)

OK

Check trouble symptoms.

NG

Replace the immobilizer-ECU.

OK

CHASSIS ELECTRICAL – 

Ignition Switch and Immobilizer System

CHASSIS ELECTRICAL – 

Ignition Switch and Immobilizer System

54-17

Inspection Procedure 2

ID code cannot be registered using the MUT-

II

.

Probable cause

The cause is probably that there is no ID code registered in the immobilizer-ECU,
or there is a malfunction of the immobilizer-ECU.

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 ignition key can be registered.

NO

Replace the ignition key that cannot be
registered.

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

YES

Is a diagnosis code output?

NO

To INSPECTION CHART FOR DIAG-
NOSIS CODE (Refer to P.54-13.)

YES

Check the immobilizer-ECU power
source and earth circuit. (Refer to
INSPECTION PROCEDURE 4.)

OK

Check trouble symptoms.

NG

Replace the immobilizer-ECU.

Inspection Procedure 3

Engine does not start (cranking but no initial combustion).

Probable cause

If the fuel injectors are not operating, there might be a problem with the MPI system
in addition to a malfunction of the immobilizer system.
It is normal for this to occur if an attempt is made to start the engine using a key
that has not been properly registered.

D

Malfunction of the MPI system

D

Malfunction of the immobilizer-ECU

Is a diagnosis code output from the
immobilizer-ECU?

NO

To INSPECTION CHART FOR DIAG-
NOSIS CODE (Refer to P.54-13.)

YES

Is a diagnosis code output from the
engine-ECU?

NO

Refer to GROUP 13A – Troubleshoot-
ing.

YES

To inspection procedure for when there
is no initial combustion. (Refer to
GROUP 13A – Troubleshooting.)

OK

Check trouble symptoms.

NG

Check the immobilizer-ECU power sup-
ply and earth circuit (Refer to INSPEC-
TION PROCEDURE 4.)

OK

Check trouble symptoms.

NG

Replace the immobilizer-ECU.

CHASSIS ELECTRICAL – 

Ignition Switch and Immobilizer System

54-18

Inspection Procedure 4

Malfunction of the immobilizer-ECU power supply and earth circuit

Measure at the immobilizer-ECU con-
nector B-100.

D

Disconnect the connector and
measure at the harness side.

(1) Voltage between 2 and body earth

(Ignition switch: ON)
OK:  System voltage

(2) Voltage between 1 and body earth

OK:  System voltage

(3) Continuity between 8 and body earth

OK:  Continuity

(1) NG

Check the following connectors:
B-76, B-74, B-100

NG

Repair

OK

Check trouble symptoms.

NG

Check the fuse and the harness wire
between the ignition switch (IG) and
immobilizer-ECU.

NG

OK

Check trouble symptoms.

NG

Check the ignition switch. 
(Refer to P.54-20.)

(2) NG

Check the following connectors:
B-65, B-100

NG

Repair

OK

Check trouble symptoms.

NG

Check the harness wire between the
immobilizer-ECU and the engine control
relay, and repair if necessary.

(3) NG

Check the following connectors.
B-50, B-100

NG

Repair

OK

Check trouble symptoms.

NG

Check the harness wire between the
immobilizer-ECU and body earth, and
repair if necessary.

Repair

CHECK AT IMMOBILIZER-ECU

TERMINAL VOLTAGE CHECK CHART

Terminal No.

Signal

Checking requirements

Terminal voltage

1

Immobilizer-ECU power supply

Ignition switch: ON

System voltage

2

Ignition switch-IG

Ignition switch: OFF

0V

Ignition switch: ON

System voltage

8

Immobilizer-ECU earth

Always

0V

CHASSIS ELECTRICAL – 

Ignition Switch and Immobilizer System

54-19

IGNITION SWITCH AND IMMOBILIZER SYSTEM

Caution: SRS
Before removal of air bag module and clock spring, refer to GROUP 52B – SRS Service Precautions
and Air Bag Module and Clock Spring.

REMOVAL AND INSTALLATION

4

5

8

6

10

9

7

2

1

3

<L.H. drive vehicles>

<R.H. drive vehicles>

3

4

Immobilizer-ECU removal steps

1. Hood lock release handle
2. Driver‘s side lower cover

D

Radio and tape player <R.H drive
vehicles>

D

Heater control assembly <R.H. drive
vehicles>

3. Immobilizer-ECU

Ignition switch and ignition key
ring antenna removal steps

1. Hood lock release handle
2. Driver‘s side lower cover
4. Steering wheel
5. Column cover, lower
6. Column cover, upper
7. Column switch
8. Ignition key ring antenna

A

A

"

9. Steering lock cylinder

10. Ignition switch