Subaru Legacy III (2000-2003 year). Service manual — part 1008
IM-16
IMMOBILIZER (DIAGNOSTICS)
LIST OF DIAGNOSTIC TROUBLE CODE (DTC)
9. List of Diagnostic Trouble Code (DTC)
A: LIST
NOTE:
When a DTC except for the above immobilizer trouble code has been output, carry out diagnosis for the en-
gine trouble code. <Ref. to EN(H4SO)-83, List of Diagnostic Trouble Code (DTC).> or <Ref. to EN(H4SOw/
oOBD)-57, List of Diagnostic Trouble Code (DTC).> or <Ref. to EN(H6DO)-89, List of Diagnostic Trouble
Code (DTC).> or<Ref. to EN(H4DOSTC)-62, List of Diagnostic Trouble Code (DTC).>
Item appearing on select monitor screen
Contents of diagnosis
Index No.
DTC
Item
Without
OBD
With
OBD
53
P1571
Reference Code Incompati-
bility
Reference code incompatibility
between IMM ECM and ECM
P1572
IMM Circuit Failure
(Except Antenna Circuit)
Communication failure between
IMM ECM and ECM
P1574
Key Communication Failure
Failure of IMM ECM to verify key
(transponder) ID code
P0153
Use of Unregistered Key
Incorrect immobilizer key (Use of
unregistered key in IMM ECM)
P1576
EGI Control Module
EEPROM
ECM malfunctioning
P1577
IMM Control Module
EEPROM
IMM ECM malfunctioning
P1570
ANTENNA
Faulty antenna
<Ref. to IM-26, DTC P1570 ANTENNA,
Diagnostic Procedure with Trouble
Code (DTC).>
IM-17
IMMOBILIZER (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH TROUBLE CODE (DTC)
10.Diagnostic Procedure with Trouble Code (DTC)
A: DTC P1571 REFERENCE CODE INCOMPATIBILITY
DIAGNOSIS:
• Reference code incompatibility between IMM ECM and 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.
Is teaching operation for all keys completed?
Teaching operation for all keys
is completed.
END
Replace ECM
<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.> and
IMM ECM <Ref.
to SL-36, Immobi-
lizer Control Mod-
ule.> and then
replace all ignition
keys (including the
transponder).
Then perform
teaching opera-
tion. Refer to
teaching opera-
tion manual (Pub.
No. S0820GZ).
IM-18
IMMOBILIZER (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH TROUBLE CODE (DTC)
B: DTC P1572 IMM CIRCUIT FAILURE (EXCEPT ANTENNA CIRCUIT)
DIAGNOSIS:
• Communication failure between IMM ECM and ECM
WIRING DIAGRAM:
• Non-TURBO
IM-00056
: WITH OBD MODEL
: WITHOUT OBD MODEL
WO
OO
12
2
3
10
6
1
11
B141
F44
B61
IMMOBILIZER
CONTROL
MODULE
BATTERY
F/B No. 11
L
R
6
: LHD MODEL
: RHD MODEL
L
R
: 4-CYLINDER ENGINE MODEL
: 6-CYLINDER ENGINE MODEL
H4
H6
B141
1 2 3
4 5
6 7 8 9 10 11 12
SBF-1
SBF-5
SBF-4
IGNITION
SWITCH
C16
B23
B22
B19
D17
OO
WO
D18
B135
B:
B136
C:
B137
D:
ENGINE
CONTROL
MODULE
B135
ENGINE
CONTROL
MODULE
B19
B14
B5
R
L
H6
H6
H6
H4
H4
H4
1 2 3 4
5 6 7 8
F44
5 6 7
8
2
1
9
4
3
10
24
22 23
25
11 12 13 14 15
26
27 28
16 17 18 19
20 21
B135
B135
5 6
7 8
2
1
9
4
3
10
24
22
23
25
11 12 13 14 15
26 27 28
16 17 18 19
20 21
5
4
6 7
8
2
1
9
3
10
22
23
11 12 13 14 15
24 25
26 27
16 17 18
28 29
19 20
21
30
B136
H6
H4
H4
H6
C:
H6
B:
H4
B:
D:
B:
B137
4
1
5
3
2
6
18
15
16
7 8 9 10 11
17
19 20
12 13
14
IM-19
IMMOBILIZER (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH TROUBLE CODE (DTC)
• TURBO model
IM-00061
12
2
3
10
6
1
11
B141
IMMOBILIZER
CONTROL
MODULE
BATTERY
F/B No. 11
B141
1 2 3
4 5
6 7 8 9 10 11 12
SBF-1
SBF-5
SBF-4
IGNITION
SWITCH
B135
ENGINE
CONTROL
MODULE
B19
B14
B5
B135
5 6
7 8
2
1
9
4
3
10
24
22
23
25
11 12 13 14 15
26 27 28
16 17 18 19
20 21
B:
B:
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