Subaru Legacy III (2000-2003 year). Service manual — part 1010
IM-24
IMMOBILIZER (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH TROUBLE CODE (DTC)
D: DTC P0153 INCORRECT IMMOBILIZER KEY (USE OF UNREGISTERED KEY)
DIAGNOSIS:
• Use of unregistered key in IMM ECM
Step
Value
Yes
No
1
PERFORM TEACHING OPERATION ON IG-
NITION KEY.
Perform teaching operation on all keys of the
vehicle. Refer to teaching operation manual
(Pub. No. S0820GZ).
Is teaching operation for all keys completed?
Teaching operation for all keys
is completed.
END
Replace all ignition
keys (including the
transponder). Go
to step 2.
2
PERFORM TEACHING OPERATION ON IG-
NITION KEY.
Perform teaching operation on all keys with
vehicle. Refer to teaching operation manual
(Pub. No. S0820GZ).
Is teaching operation for all keys completed?
Teaching operation for all keys
is completed.
END
Replace IMM ECM
<Ref. to SL-36,
Immobilizer Con-
trol Module.> and
then replace all
ignition keys
(including the tran-
sponder). Then
perform teaching
operation. Refer to
teaching opera-
tion manual (Pub.
No. S0820GZ).
IM-25
IMMOBILIZER (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH TROUBLE CODE (DTC)
E: DTC P1576 EGI CONTROL MODULE EEPROM
DIAGNOSIS:
• ECM malfunctioning
1. REPLACE ECM.
Replace ECM.
<Ref. to FU(H4SO)-45, Engine Control Module.>
<Ref. to FU(H4SOw/oOBD)-42, Engine Control Module.>
<Ref. to FU(H6DO)-46, Engine Control Module.>
<Ref. to FU(H4DOSTC)-40, Engine Control Module.>
Then perform teaching operation. Refer to teaching operation manual (Pub. No. S0820GZ).
F: DTC P1577 IMM CONTROL MODULE EEPROM
DIAGNOSIS:
• IMM ECM malfunctioning
1. REPLACE IMM ECM.
Replace IMM ECM <Ref. to SL-36, Immobilizer Control Module.> and then replace all ignition keys (includ-
ing the transponder). Then perform teaching operation. Refer to teaching operation manual (Pub. No.
S0820GZ).
IM-26
IMMOBILIZER (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH TROUBLE CODE (DTC)
G: DTC P1570 ANTENNA
DIAGNOSIS:
• Faulty antenna
WIRING DIAGRAM:
IM-00066
2
1
B142
IMMOBILIZER
CONTROL
MODULE
ANTENNA
B142
1 2
IM-27
IMMOBILIZER (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK ANTENNA CIRCUIT.
1) Turn ignition switch OFF.
2) Disconnect harness antenna connector
from IMM ECM. <Ref. to SL-37, Immobi-
lizer Antenna.>
3) Measure resistance of antenna circuit.
Connector & terminal
(B142) No. 1 — No. 2:
Is the measured value less than the speci-
fied value?
10
Ω
Replace antenna.
<Ref. to SL-37,
Immobilizer
Antenna.>
2
CHECK ANTENNA CIRCUIT.
Measure resistance between antenna harness
connector and chassis ground.
Connector & terminal
(B142) No. 1 — Chassis ground
Is the measured value less than the specified
value?
10
Ω
Replace antenna.
<Ref. to SL-37,
Immobilizer
Antenna.>
3
CHECK ANTENNA CIRCUIT.
Measure resistance between antenna harness
connector and chassis ground.
Connector & terminal
(B142) No. 2 — Chassis ground
Is the measured value less than the specified
value?
10
Ω
Replace antenna.
<Ref. to SL-37,
Immobilizer
Antenna.>
4
CHECK ANTENNA CIRCUIT.
1) Turn ignition switch ON. (Engine OFF.)
2) Measure voltage between antenna harness
connector and chassis ground.
Connector & terminal
(B142) No. 1 (+) — Chassis ground (
−−−−
):
Is the measured value same as the speci-
fied value?
0 V
Replace antenna.
<Ref. to SL-37,
Immobilizer
Antenna.>
5
CHECK ANTENNA CIRCUIT.
Measure voltage between antenna harness
connector and chassis ground.
Connector & terminal
(B142) No. 2 (+) — Chassis ground (
−−−−
):
Is the measured value same as the specified
value?
0 V
Replace antenna.
<Ref. to SL-37,
Immobilizer
Antenna.>
6
CHECK IMM ECM FUNCTION.
1) Turn ignition switch OFF.
2) Connect antenna harness connector to
IMM ECM.
3) Insert the key to ignition switch, measure
changes in voltage between antenna har-
ness connector terminals.
Connector & terminal
(B142) No. 1 (+) — No. 2 (
−−−−
):
Is the measured value same as the speci-
fied value?
−
30 to 30 V (Approximately 0.1
second after inserting the key.)
0 V (Approximately 1 second
after inserting the key.)
Replace IMM ECM
<Ref. to SL-36,
Immobilizer Con-
trol Module.> and
then replace all
ignition keys
(including the tran-
sponder). Then
perform teaching
operation. Refer to
teaching opera-
tion manual (Pub.
No. S0820GZ).
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