Subaru Legacy III (2000-2003 year). 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

<Ref. to IM-17, DTC P1571 REFER-
ENCE CODE INCOMPATIBILITY, 
Diagnostic Procedure with Trouble 
Code (DTC).>

P1572

IMM Circuit Failure 
(Except Antenna Circuit)

Communication failure between 
IMM ECM and ECM

<Ref. to IM-18, DTC P1572 IMM CIR-
CUIT FAILURE (EXCEPT ANTENNA 
CIRCUIT), Diagnostic Procedure with 
Trouble Code (DTC).>

P1574

Key Communication Failure

Failure of IMM ECM to verify key 
(transponder) ID code

<Ref. to IM-23, DTC P1574 KEY COM-
MUNICATION FAILURE, Diagnostic 
Procedure with Trouble Code (DTC).>

P0153

Use of Unregistered Key

 Incorrect immobilizer key (Use of 
unregistered key in IMM ECM)

<Ref. to IM-24, DTC P0153 INCOR-
RECT IMMOBILIZER KEY (USE OF 
UNREGISTERED KEY), Diagnostic 
Procedure with Trouble Code (DTC).>

P1576

EGI Control Module 
EEPROM

ECM malfunctioning

<Ref. to IM-25, DTC P1576 EGI CON-
TROL MODULE EEPROM, Diagnostic 
Procedure with Trouble Code (DTC).>

P1577

IMM Control Module 
EEPROM

IMM ECM malfunctioning

<Ref. to IM-25, DTC P1577 IMM CON-
TROL MODULE EEPROM, Diagnostic 
Procedure with Trouble Code (DTC).>

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: