Subaru Legacy 2003 Service Manual page 4053

DIAGNOSTIC PROCEDURE WITH TROUBLE CODE (DTC)
IMMOBILIZER (DIAGNOSTICS)
7 CHECK IGNITION KEY (TRANSPONDER).
1) Remove key from ignition switch.
2) Start engine using other keys that have
undergone the teaching operation, fur-
nished with vehicle.
Does engine start?
Step Value
Engine starts.
IM-28
Yes
Replace ignition Replace IMM ECM
key (including the <Ref. to SL-36,
transponder). Immobilizer Con-
Then perform trol Module.> and
teaching opera- then replace all
tion. Refer to ignition keys
teaching opera- (including the tran-
tion manual (Pub. sponder). Then
No. S0820GZ). perform teaching
operation. Refer to
teaching opera-
tion manual (Pub.
No. S0820GZ).
No