Mitsubishi Lancer Evolution-IV - Page 357

CHASSIS ELECTRICAL – Ignition Switch and Immobilizer SystemCHASSIS 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.