CHASSIS ELECTRICAL ± Ignition Switch and Immobilizer System
54A-10
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
Inspection Procedure 1
Diagnosis code No. 54 has been generated by the
engine-ECU.
Probable cause
There is a problem with communication between the engine-ECU and the
immobilizer-ECU.
D Malfunction of harness or connector
D Malfunction of the immobilizer-ECU
D Malfunction of the engine-ECU
Check the following connectors:
C-19, C-29, C-62
NG
Repair
OK
Check trouble symptoms.
NG
Check the harness wire between en-
gine-ECU and immobilizer-ECU.
NG
Repair
NO
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.
Check trouble symptoms.
NG
Replace the engine-ECU.
Register the password (secret code)
and encrypted code (Refer to
P.54A-15.)
Inspection Procedure 2
Encrypted code cannot be registered using the MUT-II.
Probable cause
The cause is probably that there is no encrypted 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.
YES
Is a normal diagnosis code output?
NO
To INSPECTION CHART FOR DIAG-
NOSIS CODE (Refer to P.54A-8.)
YES
Check the immobilizer-ECU power
source and earth circuit. (Refer to IN-
SPECTION PROCEDURE 4.)
OK
Check trouble symptoms.
Register the password (secret code)
and encrypted code (Refer to
P.54A-15.)
NG
Replace the immobilizer-ECU.
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