Subaru Impreza 2003 Service Manual page 3296

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DIAGNOSTICS CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)
IMMOBILIZER (DIAGNOSTICS)
C: DTC P1571 REFERENCE CODE INCOMPATIBILITY
DIAGNOSIS:
• Reference code incompatibility between IMM ECM and ECM
Step
1
PERFORM TEACHING OPERATION ON IG-
NITION KEY.
Perform teaching operation on all keys of the
vehicle. Refer to the teaching operation man-
ual.
Check
Is teaching operation for all
keys completed?
IM-18
Yes
END
Replace the ECM
<Ref. to
FU(H4SO)-48,
Engine Control
Module (ECM).>,
<Ref. to
FU(H4SOw/
oOBD)-43, Engine
Control Module
(ECM).> or <Ref.
to FU(H4DOTC)-
49, Engine Con-
trol Module
(ECM).>, IMM
ECM <Ref. to SL-
39, Immobilizer
Control Module.>
and then replace
all ignition keys
(including the tran-
sponder). Then
perform teaching
operation. Refer to
the teaching oper-
ation manual (Pub.
No. S0820GZ).
No

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