Subaru Legacy III (2000-2003 year). Manual - part 167

EN(H4SO)-280

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

CC:DTC P1498 — EGR SOLENOID VALVE SIGNAL #4 CIRCUIT MALFUNCTION 

(LOW INPUT) —

• DTC DETECTING CONDITION:

• Immediately at fault recognition

• TROUBLE SYMPTOM:

• Erroneous idling
• Engine stalls.
• Engine breathing

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-01129

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

1

6

3

4

1

B22

E3

E58

B328

EGR

SOLENOID 

VALVE

2

5

E18

5

6

4

3

ECM

18

17

16

15

B134

B22

1 2 3 4
5 6 7 8
9 10 11 12

13 14 15 16

B47

3

4

5

6

1

2

LHD

LHD

E18

B328

1

3

4 5 6

2

B134

1 2

3 4

5 6

7 8

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

24 25

26 27 28 29

30 31 32 33

34 35

EN(H4SO)-281

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

CHECK POWER SUPPLY TO EGR SOLE-
NOID VALVE.
1) Turn ignition switch to OFF.
2) Disconnect connector from EGR solenoid 

valve.

3) Turn ignition switch to ON.
4) Measure voltage between EGR solenoid 

valve connector and engine ground.

Connector & terminal

(E18) No. 2 (+) - Engine ground (-):
(E18) No. 5 (+) - Engine ground (-):

Does the measured value exceed the spec-
ified value?

10 V

Go to step 2.

Repair harness 
and connector.

NOTE:
In this case, repair
the following:
• Open circuit in 
harness between 
EGR solenoid 
valve and main 
relay connector
• Poor contact in 
coupling connector

2

CHECK HARNESS BETWEEN ECM AND 
EGR SOLENOID VALVE CONNECTOR.
1) Turn ignition switch to OFF.
2) Measure resistance between ECM and 

EGR solenoid valve connector.

Connector & terminal

DTC P1492; (B134) No. 18 - (E18) No. 6:
DTC P1494; (B134) No. 17 - (E18) No. 1:
DTC P1496; (B134) No. 16 - (E18) No. 4:
DTC P1498; (B134) No. 15 - (E18) No. 3:

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

1 

Ω

Go to step 3.

Repair harness 
and connector.

NOTE:
In this case, repair
the following:
• Open circuit in 
harness between 
ECM and EGR 
solenoid valve 
connector
• Poor contact in 
coupling connector

3

CHECK HARNESS BETWEEN ECM AND 
EGR SOLENOID VALVE CONNECTOR.
1) Disconnect connector from ECM.
2) Measure resistance between ECM connec-

tor and chassis ground.

Connector & terminal

DTC P1492; (B134) No. 18 - Chassis 
ground:
DTC P1494; (B134) No. 17 - Chassis 
ground:
DTC P1496; (B134) No. 16 - Chassis 
ground:
DTC P1498; (B134) No. 15 - Chassis 
ground:

Does the measured value exceed the spec-
ified value?

1 M

Ω

Go to step 4.

Repair ground 
short circuit 
between ECM and 
EGR solenoid 
valve connector.

4

CHECK POOR CONTACT.
Check poor contact between ECM connector 
and EGR solenoid valve connector.
Is there poor contact of ECM connector or 
EGR solenoid valve connector?

There is poor contact.

Repair poor con-
tact of ECM con-
nector or EGR 
solenoid valve 
connector.

Replace EGR 
solenoid valve. 
<Ref. to 
FU(H4SO)-35, 
EGR Valve.>

EN(H4SO)-282

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

CD:DTC P1499 — EGR SOLENOID VALVE SIGNAL #4 CIRCUIT MALFUNCTION 

(HIGH INPUT) —

• DTC DETECTING CONDITION:

• Immediately at fault recognition

• TROUBLE SYMPTOM:

• Erroneous idling
• Engine stalls.
• Engine breathing

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-01129

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

1

6

3

4

1

B22

E3

E58

B328

EGR

SOLENOID 

VALVE

2

5

E18

5

6

4

3

ECM

18

17

16

15

B134

B22

1 2 3 4
5 6 7 8
9 10 11 12

13 14 15 16

B47

3

4

5

6

1

2

LHD

LHD

E18

B328

1

3

4 5 6

2

B134

1 2

3 4

5 6

7 8

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

24 25

26 27 28 29

30 31 32 33

34 35

EN(H4SO)-283

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

CHECK ANY OTHER DTC ON DISPLAY.
Is there any DTC on display?

Other DTC indicated on dis-
play.

Go to step 2.

Go to step 3.

2

CHECK ECM GROUND CIRCUIT.
1) Turn ignition switch to OFF.
2) Measure resistance between ECM connec-

tor and chassis ground.

Connector & terminal

(B134) No. 7 - Chassis ground:
(B137) No. 14 - Chassis ground:
(B135) No. 21 - Chassis ground:

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

5 Ω

Go to step 3.

Repair harness 
and connector.

NOTE:
In this case, repair
the following:
• Open circuit in 
harness between 
ECM connector 
and engine ground
• Poor contact in 
ECM connector
• Poor contact in 
coupling connector

3

CHECK HARNESS BETWEEN ECM AND 
EGR SOLENOID VALVE CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from EGR solenoid 

valve.

3) Turn ignition switch to ON.
4) Measure voltage between ECM connector 

and chassis ground.

Connector & terminal

DTC P1493; (B134) No. 18 - Chassis 
ground:
DTC P1495; (B134) No. 17 - Chassis 
ground:
DTC P1497; (B134) No. 16 - Chassis 
ground:
DTC P1499; (B134) No. 15 - Chassis 
ground:

Does the measured value exceed the spec-
ified value?

10 V

Repair ground 
short circuit 
between ECM and 
EGR solenoid 
valve connector. 
After completion of 
repair, replace 
ECM. <Ref. to 
FU(H4SO)-45, 
Engine Control 
Module.>

Replace ECM. 
<Ref. to 
FU(H4SO)-45, 
Engine Control 
Module.>