Subaru Legacy III (2000-2003 year). Manual - part 119

EN(H4SO)-88

ENGINE (DIAGNOSTICS)

LIST OF DIAGNOSTIC TROUBLE CODE (DTC)

P1495

EGR solenoid valve signal #2 circuit malfunction 
(high input)

<Ref. to EN(H4SO)-279, DTC P1495 — EGR SOLENOID 
VALVE SIGNAL #2 CIRCUIT MALFUNCTION (HIGH INPUT) 
—, Diagnostic Procedure with Diagnostic Trouble Code 
(DTC).>

P1496

EGR solenoid valve signal #3 circuit malfunction 
(low input)

<Ref. to EN(H4SO)-279, DTC P1496 — EGR SOLENOID 
VALVE SIGNAL #3 CIRCUIT MALFUNCTION (LOW INPUT)—
, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

P1497

EGR solenoid valve signal #3 circuit malfunction 
(high input)

<Ref. to EN(H4SO)-279, DTC P1497 — EGR SOLENOID 
VALVE SIGNAL #3 CIRCUIT MALFUNCTION (HIGH INPUT) 
—, Diagnostic Procedure with Diagnostic Trouble Code 
(DTC).>

P1498

EGR solenoid valve signal #4 circuit malfunction 
(low input)

<Ref. to EN(H4SO)-280, DTC P1498 — EGR SOLENOID 
VALVE SIGNAL #4 CIRCUIT MALFUNCTION (LOW INPUT) 
—, Diagnostic Procedure with Diagnostic Trouble Code 
(DTC).>

P1499

EGR solenoid valve signal #4 circuit malfunction 
(high input)

<Ref. to EN(H4SO)-282, DTC P1499 — EGR SOLENOID 
VALVE SIGNAL #4 CIRCUIT MALFUNCTION (HIGH INPUT) 
—, Diagnostic Procedure with Diagnostic Trouble Code 
(DTC).>

P1510

ISC solenoid valve signal #1 circuit malfunction 
(low input)

<Ref. to EN(H4SO)-220, DTC P0502 — VEHICLE SPEED 
SENSOR CIRCUIT LOW INPUT —, Diagnostic Procedure with 
Diagnostic Trouble Code (DTC).>

P1511

ISC solenoid valve signal #1 circuit malfunction 
(high input)

<Ref. to EN(H4SO)-284, DTC P1511 — ISC SOLENOID 
VALVE SIGNAL #1 CIRCUIT MALFUNCTION (HIGH INPUT) 
—, Diagnostic Procedure with Diagnostic Trouble Code 
(DTC).>

P1512

ISC solenoid valve signal #2 circuit malfunction 
(low input)

<Ref. to EN(H4SO)-284, DTC P1512 — ISC SOLENOID 
VALVE SIGNAL #2 CIRCUIT MALFUNCTION (LOW INPUT) 
—, Diagnostic Procedure with Diagnostic Trouble Code 
(DTC).>

P1513

ISC solenoid valve signal #2 circuit malfunction 
(high input)

<Ref. to EN(H4SO)-284, DTC P1513 — ISC SOLENOID 
VALVE SIGNAL #2 CIRCUIT MALFUNCTION (HIGH INPUT) 
—, Diagnostic Procedure with Diagnostic Trouble Code 
(DTC).>

P1514

ISC solenoid valve signal #3 circuit malfunction 
(low input)

<Ref. to EN(H4SO)-284, DTC P1514 — ISC SOLENOID 
VALVE SIGNAL #3 CIRCUIT MALFUNCTION (LOW INPUT) 
—, Diagnostic Procedure with Diagnostic Trouble Code 
(DTC).>

P1515

ISC solenoid valve signal #3 circuit malfunction 
(high input)

<Ref. to EN(H4SO)-284, DTC P1515 — ISC SOLENOID 
VALVE SIGNAL #3 CIRCUIT MALFUNCTION (HIGH INPUT) 
—, Diagnostic Procedure with Diagnostic Trouble Code 
(DTC).>

P1516

ISC solenoid valve signal #4 circuit malfunction 
(low input)

<Ref. to EN(H4SO)-286, DTC P1516 — ISC SOLENOID 
VALVE SIGNAL #4 CIRCUIT MALFUNCTION (LOW INPUT) 
—, Diagnostic Procedure with Diagnostic Trouble Code 
(DTC).>

P1517

ISC solenoid valve signal #4 circuit malfunction 
(high input)

<Ref. to EN(H4SO)-288, DTC P1517 — ISC SOLENOID 
VALVE SIGNAL #4 CIRCUIT MALFUNCTION (HIGH INPUT) 
—, Diagnostic Procedure with Diagnostic Trouble Code 
(DTC).>

P1518

Starter switch circuit low input

<Ref. to EN(H4SO)-290, DTC P1518 — STARTER SWITCH 
CIRCUIT LOW INPUT —, Diagnostic Procedure with Diagnos-
tic Trouble Code (DTC).>

P1560

Back-up voltage circuit malfunction

<Ref. to EN(H4SO)-294, DTC P1560 — BACK-UP VOLTAGE 
CIRCUIT MALFUNCTION —, Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>

DTC

No.

Item

Index

EN(H4SO)-89

ENGINE (DIAGNOSTICS)

LIST OF DIAGNOSTIC TROUBLE CODE (DTC)

P1570

Antenna

<Ref. to IM-26, DTC P1570 ANTENNA, Diagnostic Procedure 
with Trouble Code (DTC).>

P1571

Reference code imcompatibility

<Ref. to IM-17, DTC P1571 REFERENCE CODE INCOMPATI-
BILITY, Diagnostic Procedure with Trouble Code (DTC).>

P1572

IMM circuit failure

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

P1574

Key communication failure

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

P1576

EGI control module EEPROM

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

P1577

IMM control module

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

P1698

Engine torque control cut signal circuit malfunction 
(low input)

<Ref. to EN(H4SO)-296, DTC P1698 — ENGINE TORQUE 
CONTROL CUT SIGNAL CIRCUIT MALFUNCTION (LOW 
INPUT) —, Diagnostic Procedure with Diagnostic Trouble Code 
(DTC).>

P1699

Engine torque control cut signal circuit malfunction 
(high input)

<Ref. to EN(H4SO)-298, DTC P1699 — ENGINE TORQUE 
CONTROL CUT SIGNAL CIRCUIT MALFUNCTION (HIGH 
INPUT) —, Diagnostic Procedure with Diagnostic Trouble Code 
(DTC).>

P1700

Throttle position sensor circuit malfunction for AT

<Ref. to AT-52, DTC 31 THROTTLE POSITION SENSOR, 

Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

P1711

Engine torque control signal #1 circuit malfunction

<Ref. to EN(H4SO)-300, DTC P1711 — ENGINE TORQUE 
CONTROL SIGNAL #1 CIRCUIT MALFUNCTION —, Diagnos-
tic Procedure with Diagnostic Trouble Code (DTC).>

P1712

Engine torque control signal #2 circuit malfunction

<Ref. to EN(H4SO)-302, DTC P1712 — ENGINE TORQUE 
CONTROL SIGNAL #2 CIRCUIT MALFUNCTION —, Diagnos-
tic Procedure with Diagnostic Trouble Code (DTC).>

DTC

No.

Item

Index

EN(H4SO)-90

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

19.Diagnostic Procedure with Diagnostic Trouble Code (DTC)

A: DTC P0030 — HO2S HEATER CONTROL CIRCUIT (BANK 1 SENSOR 1) —

• DTC DETECTING CONDITION:

• Two consecutive driving cycles with fault

CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode<Ref. to EN(H4SO)-47, OPER-
ATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-40, OPERATION, Inspection 
Mode.> .
• WIRING DIAGRAM:

EN-01144

F44

B61

6

RHD

RHD

BATTERY

SBF-5

B47

MAIN RELAY

1

2

3

5

4

6

F44

1 2 3 4
5 6 7 8

C16

C5

4

8

B22

E3

ECM

C6

C17

C22

C13

B23

3

2

1

FRONT OXYGEN 

(A/F) SENSOR

B18

B135

B:

B136

C:

B22

1 2 3 4
5 6 7 8
9 10 11 12

13 14 15 16

B47

3

4

5

6

1

2

B136

5 6

7

2

1

9

8

4

3

23

21 22

24

10 11 12 13 14

25 26

15 16 17

18 19 20

B18

4

2 1

3

LHD

LHD

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

EN(H4SO)-91

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

CHECK HARNESS BETWEEN ECM AND 
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
1) Start and warm-up engine.
2) Turn ignition switch to OFF.
3) Disconnect connectors from ECM and front 

oxygen (A/F) sensor.

4) Measure harness resistance between ECM 

and front oxygen (A/F) sensor connector.

Connector & terminal

(B136) No. 6 - (B18) No. 3:
(B136) No. 17 - (B18) No. 3:

Is the measured value less than the speci-
fied value?

1 Ω

Go to step 2.

Repair open circuit 
between ECM and 
front oxygen (A/F) 
sensor connector.

2

CHECK HARNESS BETWEEN ECM AND 
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
Measure harness resistance between ECM 
and front oxygen (A/F) sensor connector.

Connector & terminal

(B136) No. 13 - (B18) No. 1:
(B136) No. 22 - (B18) No. 2:

Is the measured value less than the specified 
value?

1 Ω

Go to step 3.

Repair open circuit 
between ECM and 
front oxygen (A/F) 
sensor connector.

3

CHECK HARNESS BETWEEN ECM AND 
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
Measure harness resistance between main 
relay and front oxygen (A/F) sensor connector.

Connector & terminal

(B47) No. 4  — (B18) No. 4:

Is the measured value less than the specified 
value?

1 

Ω

Go to step 4.

Repair open circuit 
between ECM and 
front oxygen (A/F) 
sensor connector.

4

CHECK FRONT OXYGEN (A/F) SENSOR.
Measure resistance between terminals in front 
oxygen (A/F) sensor connector.

Terminal

No.3 - No.4:

Is the measured value less than the specified 
value?

5 

Ω

Go to step 5.

Replace front oxy-
gen (A/F) sensor.  
<Ref. to 
FU(H4SO)-41, 
Front Oxygen (A/
F) Sensor.>

5

CHECK POOR CONTACT.
Check ECM and front oxygen (A/F) sensor 
connector for poor contact.
Is there any poor contact in ECM and front 
oxygen (A/F) sensor connector.

There is poor contact.

Repair poor con-
tact in ECM and 
front oxygen (A/F) 
sensor connector.

Replace front oxy-
gen (A/F) sensor. 
<Ref. to 
FU(H4SO)-41, 
Front Oxygen (A/
F) Sensor.>