Subaru LEGACY 2004 Service Manual page 704

IMMOBILIZER (DIAGNOSTICS)
2. BODY INTEGRATED UNIT
DTC Item
B0401 M collation NG
Immobilizer Key colla-
B0402
tion NG
B0403 E/G request NG
NOTE:
• Immobilizer system of 2.5 L EC, EK model and 3.0 L model perform the starter relay control. When the
body integrated unit detect the inconformity of reference code, immediately out put the starter relay cut signal
to ECM, and then ECM stop the starter relay operation. In this case, engine does not start, and DTC is not
recorded in ECM. Check that the engine does not start on the DTC of body integrated unit.
• DTC B0402 is recorded as freeze frame data when the ignition switch is turned to OFF. When trying to start
the engine with unregistered immobilizer key, DTC is not displayed on Subaru Select Monitor immediately.
Turn the ignition switch to OFF once and turn to ON again before checking DTC. At this time (when turning
the ignition switch to ON again), be careful that the DTC is displayed as freeze frame data even with the reg-
istered immobilizer key.
List of Diagnostic Trouble Code (DTC)
Contents of diagnosis
Reference code incompatibil-
ity between body integrated
unit and combination meter
• Incorrect immobilizer key
(Use of unregistered key in
body integrated unit)
• Faulty antenna
Communication failure
between body integrated unit
and ECM
IM(diag)-16
Index No.
<Ref. to IM(diag)-26, DTC
P1578 METER FAILURE, Diag-
nostic Procedure with Diagnos-
tic Trouble Code (DTC).>
<Ref. to IM(diag)-17, DTC
P0513 INCORRECT IMMOBI-
LIZER KEY, Diagnostic Proce-
dure with Diagnostic Trouble
Code (DTC).> <Ref. to IM(diag)-
18, DTC P1570 ANTENNA,
Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).> or
<Ref. to IM(diag)-25, DTC
P1574 KEY COMMUNICA-
TION FAILURE, Diagnostic Pro-
cedure with Diagnostic Trouble
Code (DTC).>
<Ref. to IM(diag)-22, DTC
P1572 IMM CIRCUIT FAILURE
(EXCEPT ANTENNA CIR-
CUIT), Diagnostic Procedure
with Diagnostic Trouble Code
(DTC).>
Relation between ECM and
DTC
P1578
• P0513
• P1570
• P1574
P1572