Subaru Legacy (2005 year). Manual — part 107

EN(H4SO 2.0)(diag)-17

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)

NOTE

Ignition SW ON

(engine OFF)

Engine ON

(idling)

Crankshaft
position sen-
sor (Model
with immobi-
lizer)

Signal (+)

B136

27

0

−7 — +7

Sensor output waveform

Signal (

−)

B136

24

0

0

—

Shield

B136

32

0

0

—

Crankshaft
position sen-
sor (Model
without immo-
bilizer)

Signal (+)

B136

26

0

−7 — +7

Sensor output waveform

Signal (

−)

B136

24

0

0

—

Shield

B136

32

0

0

—

Camshaft
position sen-
sor (Model
with immobi-
lizer)

Signal (+)

B136

26

0

−7 — +7

Sensor output waveform

Signal (

−)

B136

25

0

0

—

Shield

B136

32

0

0

—

Camshaft
position sen-
sor (Model
without immo-
bilizer)

Signal (+)

B136

27

0

−7 — +7

Sensor output waveform

Signal (

−)

B136

25

0

0

—

Shield

B136

32

0

0

—

Electronic
throttle control

Main

B137

23

0.4 — 1.1

Fully opened:

3.7 — 4.3

0.3 — 0.9

(After engine is

warmed-up.)

—

Sub

B137

24

3.9 — 4.8

Fully opened:

0.65 — 1.5

4.05 — 4.95

(After engine is

warmed-up.)

—

Electronic throttle control
motor 1 (+)

B137

2

Duty waveform

Duty waveform

Drive frequency: 1 kHz

Electronic throttle control
motor 2 (+)

B137

3

Duty waveform

Duty waveform

Drive frequency: 1 kHz

Electronic throttle control
motor 1 (

−)

B137

4

Duty waveform

Duty waveform

Drive frequency: 1 kHz

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(H4SO 2.0)(diag)-18

ENGINE (DIAGNOSTICS)

Engine Control Module (ECM) I/O Signal

Electronic throttle control
motor 2 (

−)

B137

5

Duty waveform

Duty waveform

Drive frequency: 1 kHz

Electronic throttle control
motor 1 power supply

B137

6

10 — 13

13 — 14

—

Electronic throttle control
motor 2 power supply

B137

7

10 — 13

13 — 14

—

Electronic throttle control
motor relay

B137

9

ON: 0

OFF: 10 — 13

ON: 0

OFF: 13 — 14

When ignition switch is

turned to ON: ON

Accelerator
pedal position
sensor

Main

B137

29

Fully closed: 0.5 — 1.5

Fully opened: 3 — 5

Fully closed:

0.5 — 1.5

Fully opened: 3 — 5

—

Power
supply

B137

25

5

5

—

Ground

B137

31

0

0

—

Sub

B137

30

Fully closed: 0.5 — 1.5

Fully opened: 3 — 5

Fully closed:

0.5 — 1.5

Fully opened: 3 — 5

—

Shield

B137

19

0

0

—

Rear oxygen
sensor

Signal

B136

19

0

0 — 0.9

—

Shield

B136

30

0

0

—

Front oxygen
(A/F) sensor
heater

Signal 1

B135

2

0 — 1.0

13 — 14

—

Signal 2

B135

3

0 — 1.0

13 — 14

—

Rear oxygen sensor heater
signal

B134

1

0 — 1.0

13 — 14

—

Engine coolant temperature
sensor

B136

22

1.0 — 1.6

1.0 — 1.6

After engine is warmed-up.

Starter switch

B135

23

OFF: 0

ON: 10 — 13

OFF: 0

ON: 13 — 14

—

A/C switch

B135

20

ON: 10 — 13

OFF: 0

ON: 13 — 14

OFF: 0

—

Ignition switch

B135

13

10 — 13

13 — 14

—

Neutral position switch

B135

12

ON: 0

OFF: 10 — 14

• For AT model switch is
ON when shifted into “P”
or “N” range.
• For MT model switch is
ON when shifted into “N”
range.

Test mode connector

B135

24

5

5

When connected: 0

Knock sensor

Signal

B136

23

2.8

2.8

—

Shield

B136

12

0

0

—

Backup power supply

B136

7

10 — 13

13 — 14

Ignition switch “OFF”: 10

— 13

Control module power sup-
ply

B136

3

10 — 13

13 — 14

—

B136

4

10 — 13

13 — 14

—

Sensor power supply 1

B136

17

5

5

—

Sensor power supply 2

B137

25

5

5

—

Ignition control

1

B134

23

0

1 — 3.4

Waveform

2

B134

24

0

1 — 3.4

Waveform

Blower fan switch

B135

11

ON: 0

OFF: 10 — 13

ON: 0

OFF: 13 — 14

—

A/C middle pressure switch

B135

8

ON: 0

OFF: 10 — 13

ON: 0

OFF: 13 — 14

—

DESCRIPTION

Connector

No.

Termi-

nal

No.

Signal (V)

NOTE

Ignition SW ON

(engine OFF)

Engine ON

(idling)

EN(H4SO 2.0)(diag)-19

ENGINE (DIAGNOSTICS)

Engine Control Module (ECM) I/O Signal

Fuel injector

#1

B134

17

10 — 13

1 — 14

Waveform

#2

B134

27

10 — 13

1 — 14

Waveform

#3

B134

34

10 — 13

1 — 14

Waveform

#4

B134

33

10 — 13

1 — 14

Waveform

Fuel pump relay control
(Model with immobilizer)

B135

17

0.5 or less

0.5 or less

—

Fuel pump relay control
(Model without immobilizer)

B134

18

0.5 or less

0.5 or less

—

A/C relay control

B135

35

ON: 0.5 or less

OFF: 10 — 13

ON: 0.5 or less

OFF: 13 — 14

—

Radiator fan relay 1 control

B134

10

ON: 0.5 or less

OFF: 10 — 13

ON: 0.5 or less

OFF: 13 — 14

—

Radiator fan relay 2 control

B134

9

ON: 0.5 or less

OFF: 10 — 13

ON: 0.5 or less

OFF: 13 — 14

—

Self-shutoff control

B135

14

10 — 13

13 — 14

—

Malfunction indicator light

B135

15

1 or less

—

Light ON: 1 or less

Light OFF: 10 — 14

Engine speed output

B135

27

—

0 — 13 or more

Waveform

Purge control solenoid valve

B134

8

ON: 1 or less

OFF: 10 — 13

ON: 1 or less

OFF: 13 — 14

—

EGR solenoid
valve

Signal A+

B134

13

0 or 10 — 13

0 or 13 — 14

—

Signal A

−

B134

12

0 or 10 — 13

0 or 13 — 14

—

Signal B+

B134

3

0 or 10 — 13

0 or 13 — 14

—

Signal B

−

B134

4

0 or 10 — 13

0 or 13 — 14

—

Power steering switch

B135

8

ON: 1 or less

OFF: 10 — 13

ON: 1 or less

OFF: 13 — 14

—

Front oxygen (A/F) sensor
signal 1

B136

35

—

2.05 — 2.25

—

Front oxygen (A/F) sensor
signal 2

B136

33

—

2.05 — 2.25

—

Front oxygen (A/F) sensor
shield

B136

34

0

0

—

Manifold absolute pressure
sensor

B136

20

4.0 — 4.8

1.1 — 1.9

—

Intake air temperature sen-
sor

B136

28

3.3 — 3.5

3.3 — 3.5

Intake air temperature:

25

°C (75°F)

Generator control

B135

16

0 — 6.5

0 — 6.5

—

SSM communication line

B135

32

1 or less

←→ 4 or more

1 or less

←→ 4 or

more

—

Cruise control main switch

B137

14

ON: 0

OFF: 10 — 13

ON: 0

OFF: 13 — 14

—

Cruise control clutch switch

B137

22

When clutch pedal is

depressed: 0

When clutch pedal is

released: 10 — 13

When clutch pedal is

depressed: 0

When clutch pedal is

released: 13 — 14

—

Brake switch 1

B137

12

When brake pedal is

depressed: 0

When brake pedal is

released: 10 — 13

When brake pedal is

depressed: 0

When brake pedal is

released: 13 — 14

—

Brake switch 2

B137

13

When brake pedal is

depressed: 10 — 13

When brake pedal is

released: 0

When brake pedal is

depressed: 13 — 14

When brake pedal is

released: 0

—

DESCRIPTION

Connector

No.

Termi-

nal

No.

Signal (V)

NOTE

Ignition SW ON

(engine OFF)

Engine ON

(idling)

EN(H4SO 2.0)(diag)-20

ENGINE (DIAGNOSTICS)

Engine Control Module (ECM) I/O Signal

Cruise control command
switch

B136

21

When operating noth-

ing: 3.5 — 4.5

When operating RES/

ACC: 2.5 — 3.5

When operating SET/

COAST: 0.5 — 1.5

When operating CAN-

CEL: 0 — 0.5

When operating

nothing: 3.5 — 4.5

When operating

RES/ACC:

2.5 — 3.5

When operating

SET/COAST:

0.5 — 1.5

When operating

CANCEL: 0 — 0.5

—

GND (sensor 1)

B136

18

0

0

—

GND (sensor 2)

B137

31

0

0

—

GND (injector)

B134

7

0

0

—

GND (power supply)

B134

2

0

0

—

B137

1

0

0

—

GND (control system)

B136

5

0

0

—

B136

6

0

0

—

GND (oxygen sensor heater
1)

B135

5

0

0

—

GND (oxygen sensor heater
2)

B135

6

0

0

—

GND (electronic throttle
control)

B136

1

0

0

—

B136

2

0

0

—

DESCRIPTION

Connector

No.

Termi-

nal

No.

Signal (V)

NOTE

Ignition SW ON

(engine OFF)

Engine ON

(idling)