1998 MITSUBISHI LANCER EVOLUTION IV ECU

CHASSIS ELECTRICAL – Ignition Switch54-11
IGNITION SWITCH
REMOVAL AND INSTALLATION
123 4 5
67
8 9
10 11
12
9
ETACS-ECU or buzzer ECU removal
steps
1. Cowl side trim (R.H.)
2. Junction block
3. Buzzer control unit ETACS-ECUIgnition switch removal steps
4. Hood lock release handle
5. Driver side lower panel
6. Column cover, lower
7. Column cover, upper
8. Illumination ring or ring cover
9. Key hole illumination lamp bulb
A10. Steering lock cylinder
11. Key reminder switch
12. Ignition switch

CHASSIS ELECTRICAL – Ignition Switch and Immobilizer System54-13
IGNITION SWITCH AND IMMOBILIZER SYSTEM

SPECIAL TOOL
ToolNumberNameUse
MB991502MUT-II sub
assembly
Immobilizer system check
(Diagnosis display using the MUT-II)

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 itemsReference
page
11Transponder communication system54-14
12*ID code are not the same or are not registered54-14
21Communication system between MUT-II and engine-ECU54-15
31EEPROM abnormality inside immobilizer-ECU54-15
NOTE
*: Diagnosis code No. 12 is not recorded.

CHASSIS ELECTRICAL – Ignition Switch and Immobilizer System54-14
INSPECTION PROCEDURE FOR DIAGNOSIS CODES
Code No. 11 Transponder communication systemProbable cause

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

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

Malfunction of the transponder

Malfunction of the ignition key ring antenna

Malfunction of harness or connector

Malfunction of the immobilizer-ECU
No
OK
Check the following connectors.
B-100, B-101NG
Repair
OK
Check trouble symptoms.NGCheck the harness wire between immo-
bilizer-ECU and key ring antenna.NG
Repair
OK
Replace the immobilizer-ECU.
NG
Diagnosis codes checkCode No. 12 occursTo 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?Ye sRemove the extra ignition key.
Check trouble symptoms.
Does the engine start using the spare
ignition key which has had the ID code
registered?OKReplace 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 registeredProbable 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.
The ID code in the ignition key being used has not
been properly registered.

Malfunction of the immobilizer-ECU
Re-register the ID code.
(Refer to P.54-21.)Check trouble symptoms.NGReplace the immobilizer-ECU.

CHASSIS ELECTRICAL – Ignition Switch and Immobilizer System54-15
Code No. 21 Communication system between MUT-II and
engine-ECUProbable 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.
Malfunction of harness or connector

Malfunction of the engine-ECU

Malfunction of the immobilizer-ECU
Is diagnosis code No. 54 being gener-
ated by the engine-ECU?NOCheck 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-61NG
Repair
OK
Check trouble symptoms.NGCheck the harness wire between
engine-ECU and immobilizer-ECU.NG
Repair
OK
Check trouble symptoms.
NG
Replace the immobilizer-ECU.
Check trouble symptoms.NGReplace the engine-ECU.
Code No. 31 EEPROM abnormality inside immobilizer-
ECUProbable cause
No data has been written to the EEPROM inside the immobilizer-ECU.
Malfunction of the immobilizer-ECU
Check trouble symptoms.NGReplace the immobilizer-ECU.

CHASSIS ELECTRICAL – Ignition Switch and Immobilizer System54-16
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptomInspection procedure No.Reference page
Communication with MUT-II is impossible.154-16
ID code cannot be registered using the MUT-II.254-17
Engine does not start (Cranking but no initial combustion).354-17
Malfunction of the immobilizer-ECU power source and earth circuit454-18
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.
Malfunction of the diagnosis line

Malfunction of harness or connector

Malfunction of the immobilizer-ECU
Can the MUT-II communicate with the
engine-ECU?NOCheck the following connectors.
B-100, B-22NG
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.NGReplace the immobilizer-ECU.
OK

CHASSIS ELECTRICAL – Ignition Switch and Immobilizer SystemCHASSIS ELECTRICAL – Ignition Switch and Immobilizer System54-17
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.
Malfunction of the transponder

Malfunction of the ignition key ring antenna

Malfunction of harness or connector

Malfunction of the immobilizer-ECU
No ignition key can be registered.NOReplace the ignition key that cannot be
registered.Re-register the ID code.
(Refer to P.54-21.)
YES
Is a diagnosis code output?NOTo 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.)OKCheck trouble symptoms.NGReplace 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.
Malfunction of the MPI system

Malfunction of the immobilizer-ECU
Is a diagnosis code output from the
immobilizer-ECU?NOTo INSPECTION CHART FOR DIAG-
NOSIS CODE (Refer to P.54-13.)
YES
Is a diagnosis code output from the
engine-ECU?NORefer 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.)OKCheck trouble symptoms.NGReplace the immobilizer-ECU.

CHASSIS ELECTRICAL – Ignition Switch and Immobilizer System54-18
Inspection Procedure 4
Malfunction of the immobilizer-ECU power supply and earth circuit
Measure at the immobilizer-ECU con-
nector B-100.

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) NGCheck the following connectors:
B-76, B-74, B-100NG
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.NGCheck the ignition switch.
(Refer to P.54-20.)
(2) NG
Check the following connectors:
B-65, B-100NG
Repair
OK
Check trouble symptoms.NGCheck 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-100NG
Repair
OK
Check trouble symptoms.NGCheck 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.SignalChecking requirementsTerminal voltage
1Immobilizer-ECU power supplyIgnition switch: ONSystem voltage
2Ignition switch-IGIgnition switch: OFF0V
Ignition switch: ONSystem voltage
8Immobilizer-ECU earthAlways0V

CHASSIS ELECTRICAL – Ignition Switch and Immobilizer System54-19
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
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109 7
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Immobilizer-ECU removal steps
1. Hood lock release handle
2. Driver‘s side lower cover

Radio and tape player vehicles>

Heater control assembly vehicles>
3. Immobilizer-ECUIgnition 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
A9. Steering lock cylinder
10. Ignition switch