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
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