Subaru Legacy 2003 Service Manual page 26

DIAGNOSTIC PROCEDURE WITH TROUBLE CODE (DTC)
IMMOBILIZER (DIAGNOSTICS)
D: DTC P0153 INCORRECT IMMOBILIZER KEY (USE OF UNREGISTERED KEY)
DIAGNOSIS:
• Use of unregistered key in IMM ECM
1 PERFORM TEACHING OPERATION ON IG-
NITION KEY.
Perform teaching operation on all keys of the
vehicle. Refer to teaching operation manual
(Pub. No. S0820GZ).
Is teaching operation for all keys completed?
2 PERFORM TEACHING OPERATION ON IG-
NITION KEY.
Perform teaching operation on all keys with
vehicle. Refer to teaching operation manual
(Pub. No. S0820GZ).
Is teaching operation for all keys completed?
Step Value
Teaching operation for all keys
is completed.
Teaching operation for all keys
is completed.
IM-24
Yes
END Replace all ignition
keys (including the
transponder). Go
to step 2.
END Replace IMM ECM
<Ref. to SL-36,
Immobilizer Con-
trol Module.> and
then replace all
ignition keys
(including the tran-
sponder). Then
perform teaching
operation. Refer to
teaching opera-
tion manual (Pub.
No. S0820GZ).
No