Subaru Legacy 2003 Service Manual page 24

DIAGNOSTIC PROCEDURE WITH TROUBLE CODE (DTC)
IMMOBILIZER (DIAGNOSTICS)
8 CHECK ECM BY INTERFACE CHECK.
1) Connect harness connector to ECM.
2) Disconnect harness connector from IMM
ECM.
3) Perform interface check. <Ref. to IM-7,
INTERFACE CHECK, OPERATION,
Subaru Select Monitor.>
Does "Commun. Line Shorted to Ground"
appear on screen?
9 CHECK ECM BY INTERFACE CHECK.
Perform interface check.
Does "Commun. Line Shorted to Battery"
appear on screen?
10 CHECK ECM BY INTERFACE CHECK.
Perform interface check.
Does "Communication Line not Shorted"
appear on screen?
Step Value
"Commun. Line Shorted to
Ground" appears on screen.
"Commun. Line Shorted to Bat-
tery" appears on screen.
"Communication Line not
Shorted" appears on screen.
IM-22
Yes
Replace ECM. Go to step 9.
<Ref. to
FU(H4SO)-45,
Engine Control
Module.> or <Ref.
to FU(H4SOw/
oOBD)-42, Engine
Control Module.>
or <Ref. to
FU(H6DO)-46,
Engine Control
Module.> or <Ref.
to FU(H4DOSTC)-
40, Engine Con-
trol Module.>Then
perform teaching
operation. Refer to
teaching opera-
tion manual (Pub.
No. S0820GZ).
Replace ECM. Go to step 10.
<Ref. to
FU(H4SO)-45,
Engine Control
Module.> or <Ref.
to FU(H4SOw/
oOBD)-42, Engine
Control Module.>
or <Ref. to
FU(H6DO)-46,
Engine Control
Module.> or <Ref.
to FU(H4DOSTC)-
40, Engine Con-
trol Module.> Then
perform teaching
operation. Refer to
teaching opera-
tion manual (Pub.
No. S0820GZ).
Replace IMM ECM When "Check
<Ref. to SL-36, (Time Out)"
Immobilizer Con- appears on
trol Module.> and screen, perform
then replace all interface check
ignition keys again.
(including the tran-
sponder). Then
perform teaching
operation. Refer to
teaching opera-
tion manual (Pub.
No. S0820GZ).
No