Subaru Legacy 2002 Service Manual page 3359

DIAGNOSTICS CHART WITH TROUBLE CODE (DTC)
Immobilizer (Diagnostics)
8. Diagnostics Chart with
Trouble Code (DTC)
A: DTC P1571 REFERENCE CODE INCOMPATIBILITY
DIAGNOSIS:
¼ Reference code incompatibility between IMM ECM and ECM
No.
1 PERFORM TEACHING OPERATION ON
IGNITION KEY.
Perform teaching operation on all keys of the
vehicle. Refer to teaching operation manual.
S009811
Step
Is teaching operation for all
keys completed?
IM-14
S009811H45
Check Yes
END
No
Replace ECM
<Ref. to FU-51,
Engine Control
Module.> or <Ref.
to FU(w/oOBD)-
45, Engine Con-
trol Module.> or
<Ref. to FU(H6)-
47, Engine Con-
trol Module.>,
IMM ECM <Ref.
to SL-35, Immobi-
lizer Control Mod-
ule.> and then
replace all ignition
keys (including
the transponder).
Then perform
teaching opera-
tion. Refer to
teaching operation
manual (Pub. No.
S0820GZ).