Subaru Legacy (2005 year). Manual - part 311

EN(H4DOTC)(diag)-13

ENGINE (DIAGNOSTICS)

Electrical Component Location

(1)

Inhibitor switch

(4)

Fuel pump relay

(7)

Radiator sub fan relay

(2)

Fuel pump

(5)

Electronic throttle control relay

(8)

Radiator main fan relay 2

(3)

Main relay

(6)

Radiator main fan relay 1

(9)

Starter

EN-01935

(1)

(2)

EN-01936

(3)

EN-01937

(4)

EN-01938

(5)

EN-01898

(3)

(5)

(8) (7)

(2)

(6)

(9)

(4)

(1)

EN(H4DOTC)(diag)-14

ENGINE (DIAGNOSTICS)

Electrical Component Location

EN-00178

(2)

EN-02093

EN-02094

(3)

(4)

(5)

EN-02095

(8)

(7)

(6)

EN-02096

(9)

EN(H4DOTC)(diag)-15

ENGINE (DIAGNOSTICS)

Engine Control Module (ECM) I/O Signal

5. Engine Control Module (ECM) I/O Signal

A: ELECTRICAL SPECIFICATION

DESCRIPTION

Connector 

No.

Termi-

nal 

No.

Signal (V)

Reference

Ignition SW ON

(engine OFF)

Engine ON

(idling)

Crankshaft 
position sen-
sor

Signal (+)

B135

10

0

−7 — +7

Waveform

Signal (

−)

B135

22

0

0

—

Shield

B135

31

0

0

—

Rear oxygen 
sensor

Signal

B137

25

0

0 — 0.9

—

Shield

B137

31

0

0

—

Ground
(sensor)

B136

35

0

0

—

Front oxygen 
(A/F) sensor 
heater

Signal 1

B134

3

—

—

Waveform

Signal 2

B134

2

—

—

Waveform

Rear oxygen sensor heater 
signal

B135

2

0 — 13

—

Waveform

Engine cool-
ant tempera-
ture sensor

Signal

B136

14

1.0 — 1.4

1.0 — 1.4

After engine is warmed-up.

Ground
(sensor)

B136

35

0

0

After engine is warmed-up.

Air flow sensor

Signal

B136

23

—

0.3 — 4.5

—

Shield

B136

32

0

0

—

Ground

B136

31

0

0

—

Intake air temperature sen-
sor signal

B136

13

0.3 — 4.6

0.3 — 4.6

—

Wastegate control solenoid 
valve

B134

32

0 or 10 — 13

0 or 13 — 14

Waveform

Starter switch

B137

8

0

0

Cranking: 8 —14

A/C switch

B137

17

ON: 10 — 13

OFF: 0

ON: 13 — 14

OFF: 0

—

Ignition switch

B137

14

10 — 13

13 — 14

—

Neutral position switch

B137

9

ON: 0

OFF: 10 —13

ON: 0

OFF: 13 —14

—

Test mode connector

B137

15

10 — 13

13 — 14

When connected: 0

EN-01812

B134

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

33

34

29

32

30

31

B136

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

33

34

29

32

30

31

35

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
29

30

31

32

33

34

35

B137

5

6

7

8

2

1

9

4

3

10

22

23

11

12

13

14

15

24

25

26

16

17

18

19

20

21

27

28

29

30

31

To

To

To

To

EN(H4DOTC)(diag)-16

ENGINE (DIAGNOSTICS)

Engine Control Module (ECM) I/O Signal

Knock sensor

Signal

B136

25

2.8

2.8

—

Shield

B136

33

0

0

—

Backup power supply

B135

19

10 — 13

13 — 14

Ignition switch “OFF”: 10 

— 13

Control module power sup-
ply

B135

5

10 — 13

13 — 14

—

B135

6

10 — 13

13 — 14

—

Sensor power supply

B136

16

5

5

—

Ignition control

#1

B135

18

0

13 — 14

Waveform

#2

B135

17

0

13 — 14

Waveform

#3

B135

16

0

13 — 14

Waveform

#4

B135

16

0

13 — 14

Waveform

Fuel injector

#1

B136

6

10 — 13

1 — 14

Waveform

#2

B136

5

10 — 13

1 — 14

Waveform

#3

B136

4

10 — 13

1 — 14

Waveform

#4

B136

3

10 — 13

1 — 14

Waveform

Fuel pump 
control unit

Signal 1

B137

28

10 — 13

13 — 14

—

Signal 2

B135

27

0 or 5

0 or 5

Waveform

A/C relay control

B135

33

ON: 0.5 or less

OFF: 10 — 13

ON: 0.5 or less

OFF: 13 — 14

—

Radiator fan relay 1 control

B135

25

ON: 0.5 or less

OFF: 10 — 13

ON: 0.5 or less

OFF: 13 — 14

—

Radiator fan relay 2 control

B135

24

ON: 0.5 or less

OFF: 10 — 13

ON: 0.5 or less

OFF: 13 — 14

Model with A/C only

Malfunction indicator light

B134

17

—

—

Light ON: 1 or less

Light OFF: 10 — 14

Engine speed output

B134

23

—

0 — 13 or more

Waveform

Purge control solenoid valve

B134

14

ON: 1 or less

OFF: 10 — 13

ON: 1 or less

OFF: 13 — 14

Waveform

Manifold abso-
lute pressure 
sensor

Signal

B136

22

1.7 — 2.4

1.1 — 1.6

—

Power 
supply

B136

16

5

5

Ground
(sensor)

B136

35

0

0

Blower fan switch

B137

13

ON: 0

OFF: 10 — 13

ON: 0

OFF: 13 — 14

Model with manual A/C 

only

Power steering oil pressure 
switch

B137

10

10 — 13

ON: 0

OFF: 13 — 14

—

Front oxygen (A/F) sensor 
signal (+)

B134

33

2.8 — 3.2

2.8 — 3.2

—

Front oxygen (A/F) sensor 
signal (

−)

B134

26

2.4 — 2.7

2.4 — 2.7

—

Front oxygen (A/F) sensor 
shield

B134

25

0

0

—

SSM communication line

B137

20

1 or less 

←→ 4 or more

1 or less 

←→ 4 or 

more

—

GND (injector)

B137

7

0

0

—

GND (sensor)

B136

35

0

0

—

GND (ignition system)

B135

12

0

0

—

GND (power supply)

B135

4

0

0

—

B135

1

0

0

—

GND (control system)

B137

1

0

0

—

B137

2

0

0

—

DESCRIPTION

Connector 

No.

Termi-

nal 

No.

Signal (V)

Reference

Ignition SW ON

(engine OFF)

Engine ON

(idling)