CHASSIS ELECTRICAL -
Immobilizer System
54-2
Inspection Procedure 2
Encrypted code cannot be registered using the MUT-
II
Probable cause
The cause is probably that there is no encryptedcode registeredin theimmobilizer-ECU
or there is a malfunction of the immobilizer-ECU.
D
Malfunction of transponder
D
Malfunction of ignition key ring antenna
D
Malfunction of harness or connector
D
Malfunction of immobilizer-ECU
No ignition key can be registered.
NO
Replace the ignition key that cannot be
registered.
Re-register the encrypted code.
YES
Is a diagnosis code displayed?
YES
To INSPECTION CHART FOR DIAG-
NOSIS CODE.
NO
Check the immobilizer-ECU power
source and the earth circuit. (Refer to
P.54-3, Inspection Procedure 4.)
OK
Check trouble symptom.
NG
Replace the immobilizer-ECU.
Register the password (secret code)
and the encrypted code.
Inspection Procedure 3
Engine does not start (Cranking but no initial combus-
tion).
Probable cause
If no fuel injection, there might be a problem with the fuel injection 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 diesel fuel injection system
D
Malfunction of immobilizer-ECU
Check the system voltage during crank-
ing
OK:
8 V or more
NG
Check the battery.
OK
Is a diagnosis code displayed from the
immobilizer-ECU?
YES
To INSPECTION CHART FOR DIAG-
NOSIS CODE.
OK
Checktheelectricallycontrolledsystem.
(Refer to GROUP 13 - Troubleshoot-
ing.)
OK
Check the immobilizer-ECU power sup-
ply and the earth circuit. (Refer to P.54-3
, Inspection Procedure 4.)
OK
Check trouble symptom.
NG
Replace the immobilizer-ECU.
Register the password (secret code),
and encrypted code.
Check the following connectors:
C-24, C-120, C-126
NG
Repair
NO
Measureat immobilizer-ECUconnector
C-120.
D
Disconnect the connector and
measure at the harness side.
D
Ignition switch: ON
D
Voltage between terminal No. 7 and
body earth.
OK:
System voltage
NG
OK
Check trouble symptoms.
Check the harness wire between the
immobilizer-ECU and engine control
relay, and repair if necessary.
NG