Subaru Impreza 2003 Service Manual page 3300

DIAGNOSTICS CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)
IMMOBILIZER (DIAGNOSTICS)
Step
9 CHECK ECM BY INTERFACE CHECK.
Perform interface check.
10 CHECK ECM BY INTERFACE CHECK.
Perform interface check.
Check
Does "Commun. Line Shorted
to Battery" appear on the
screen?
Does "Communication Line not
Shorted" appear on the
screen?
IM-22
Yes
Replace the ECM. Go to step 10.
<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).> Then per-
form teaching
operation. Refer to
the teaching oper-
ation manual (Pub.
No. S0820GZ).
Replace the IMM When "Check
ECM <Ref. to SL- (Time Out)"
39, Immobilizer appears on the
Control Module.> screen, perform
and then replace interface check
all ignition keys again.
(including the tran-
sponder). Then
perform teaching
operation. Refer to
the teaching oper-
ation manual (Pub.
No. S0820GZ).
No