Subaru 2009 IMPREZA, Service Manual

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IM(diag)-22
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
IMMOBILIZER (DIAGNOSTICS)
E: DTC P1574 KEY COMMUNICATION FAILURE
DTC DETECTING CONDITION:
Communication failure between key and body integrated unit
F: DTC P1576 EGI CONTROL MODULE EEPROM
DTC DETECTING CONDITION:
• ECM malfunctioning
• Inaccessible ROM in ECM during key registration.
Step Check Yes No
1 CHECK BODY INTEGRATED UNIT FUNC-
TION.
Insert the key into the ignition switch (LOCK
position), then measure changes in voltage
between the antenna connectors.
Connector & terminal
(B415) No. 1 (+) — No. 2 (–):
Is the voltage –30 — 30 V?
(Approx. 0.1 second after
inserting the key) Is the voltage
0 V? (Approx. 1 second after
inserting the key) Go to step 2 . Replace the body
integrated unit
<Ref. to SL-50,
Body Integrated
Unit.> Replace all
ignition keys
(including the tran-
sponder). Execute
the registration
procedure next.
Refer to the “PC
application help for
Subaru Select
Monitor”.
2 CHECK IGNITION KEY (TRANSPONDER).
1) Remove the key from ignition switch.
2) Start the engine using other key which is
already registered.
Does the engine start? Replace the igni-
tion key (including
the transponder).
Execute the regis-
tration procedure
next. Refer to the
“PC application
help for Subaru
Select Monitor”. Replace the body
integrated unit
<Ref. to SL-50,
Body Integrated
Unit.> Replace all
ignition keys
(including the tran-
sponder). Execute
the registration
procedure next.
Refer to the “PC
application help for
Subaru Select
Monitor”.
Step Check Yes No
1 PERFORM REGISTRATION ON IGNITION
KEY.
Perform registration on all keys of the vehicle.
Refer to the “PC application help for Subaru
Select Monitor”.
Is registration for all keys com-
plete? Make sure it is pos-
sible to start the
engine with all keys
that have been
taught. This com-
pletes the work. Go to step 2 .
2 PERFORM REGISTRATION ON IGNITION
KEY.
Perform registration on all keys of the vehicle.
Refer to the “PC application help for Subaru
Select Monitor”.
Is registration for all keys com-
plete? Make sure it is pos-
sible to start the
engine with all keys
that have been
taught. This com-
pletes the work. Go to step 3 .
3 PERFORM REGISTRATION ON IGNITION
KEY.
Perform registration on all keys of the vehicle.
Refer to the “PC application help for Subaru
Select Monitor”.
Is registration for all keys com-
plete? Make sure it is pos-
sible to start the
engine with all keys
that have been
taught. This com-
pletes the work. Replace the ECM.
<Ref. to
FU(H4DOTC)-52,
Engine Control
Module (ECM).>