Subaru Legacy IV (2008 year). Manual - part 104

EN(H4SO)(diag)-19

Engine Control Module (ECM) I/O Signal

ENGINE (DIAGNOSTICS)

Fuel pump relay control

B136

12

ON: 0.5 or less

OFF: 10 — 13

ON: 0.5 or less

OFF: 12 — 14

 — 

A/C relay control

B136

9

ON: 0.5 or less

OFF: 10 — 13

ON: 0.5 or less

OFF: 12 — 14

 — 

Radiator fan relay 1 control

B136

18

ON: 0.5 or less

OFF: 10 — 13

ON: 0.5 or less

OFF: 12 — 14

 — 

Radiator fan relay 2 control

B136

29

ON: 0.5 or less

OFF: 10 — 13

ON: 0.5 or less

OFF: 12 — 14

 — 

Self-shutoff control

B136

23

0.5 or less

0.5 or less

 — 

Malfunction indicator light

B136

11

 — 

 — 

Light “ON”: 1 or less

Light “OFF”: 10 — 14

Engine speed output

B136

22

 — 

0 — 13 or more

Waveform

Oil temperature sensor signal

B134

23

1.0 — 1.4

1.0 — 1.4

After engine is 

warmed up.

PCV diagnosis connector

B134

30

0

0

 — 

Purge control solenoid valve

B137

29

ON: 1 or less

OFF: 10 — 13

ON: 1 or less

OFF: 12 — 14

Duty waveform

EGR valve

Signal 1

B134

8

0 or 10 — 13

0 or 12 — 14

Waveform

Signal 2

B134

9

0 or 10 — 13

0 or 12 — 14

Waveform

Signal 3

B134

10

0 or 10 — 13

0 or 12 — 14

Waveform

Signal 4

B134

20

0 or 10 — 13

0 or 12 — 14

Waveform

Power steering oil pressure 
switch

B134

33

ON: 1 or less

OFF: 10 — 13

ON: 1 or less

OFF: 12 — 14

 — 

Blower fan switch

B135

11

ON: 0

OFF: 10 — 13

ON: 0

OFF: 12 — 14

 — 

A/C middle pressure switch

B136

33

ON: 0

OFF: 10 — 13

ON: 0

OFF: 12 — 14

 — 

Oil switching 
solenoid valve 
RH

Signal (+)

B137

25

0

Duty waveform

Drive frequency: 

300 Hz

Signal (–)

B137

24

0

0

 — 

Oil switching 
solenoid valve 
LH

Signal (+)

B137

31

0

Duty waveform

Drive frequency: 

300 Hz

Signal (–)

B137

30

0

0

 — 

Variable valve lift diagnosis oil 
pressure switch RH

B134

31

0

0

 — 

Variable valve lift diagnosis oil 
pressure switch LH

B134

32

0

0

 — 

Front oxygen 
(A/F) sensor

Signal (+)

B135

9

 — 

2.7 — 2.9

 — 

Signal (–)

B135

8

 — 

2.35 — 2.25

 — 

Shield

B135

1

0

0

 — 

Manifold absolute pressure sensor

B134

6

3.4 — 3.8

1.4 — 1.8

 — 

Air flow sensor

Signal

B135

26

 — 

0.3 — 4.5

 — 

Shield

B135

35

0

0

 — 

Ground

B135

34

0

0

 — 

Intake air temperature sensor 
signal

B135

18

0.3 — 4.6

0.3 — 4.6

 — 

Immobilizer communication 1

B136

26

1 or less 

mo 4 or 

more

1 or less 

mo 4 or 

more

 — 

Immobilizer communication 2

B136

34

1 or less 

mo 4 or 

more

1 or less 

mo 4 or 

more

 — 

Contents

Connector 

No.

Terminal 

No.

Signal (V)

Note

Ignition SW ON

(engine OFF)

Engine ON

(idling)

EN(H4SO)(diag)-20

Engine Control Module (ECM) I/O Signal

ENGINE (DIAGNOSTICS)

SSM communication line

B136

16

1 or less 

mo 4 or 

more

1 or less 

mo 4 or 

more

 — 

Sensor power supply

B134

19

5

5

 — 

B135

22

5

5

 — 

GND (sensor)

B134

29

0

0

 — 

B135

30

0

0

 — 

Ground

(Engine 1)

B134

5

0

0

 — 

(Engine 2)

B137

7

0

0

 — 

(Engine 3)

B137

2

0

0

 — 

(Engine 4)

B137

1

0

0

 — 

(Engine 5)

B137

3

0

0

 — 

(Ignition 1)

B137

26

0

0

 — 

(Ignition 2)

B137

6

0

0

 — 

(Body)

B136

6

0

0

 — 

Clutch switch

B136

25

When clutch pedal is 

depressed: 0

When clutch pedal is 

released: 10 — 13

When clutch pedal is 

depressed: 0

When clutch pedal is 

released: 12 — 14

 — 

Brake switch 1

B135

20

When brake pedal is 

depressed: 0

When brake pedal is 

released: 10 — 13

When brake pedal is 

depressed: 0

When brake pedal is 

released: 12 — 14

 — 

Brake switch 2

B135

28

When brake pedal is 

depressed: 10 — 13

When brake pedal is 

released: 0

When brake pedal is 

depressed: 12 — 14

When brake pedal is 

released: 0

 — 

Cruise control main switch

B135

12

ON: 0

OFF: 5

ON: 0

OFF: 5

 — 

Cruise control command switch

B135

24

When not operating: 

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

When not operating: 

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

 — 

Fuel temperature sensor

B135

17

2.5 — 3.8

2.5 — 3.8

Ambient temperature: 

25°C (77°F)

Fuel tank pressure sensor

B135

32

2.3 — 2.7

2.3 — 2.7

Value after removing 

fuel filler cap and 

installing again

Pressure control solenoid valve

B136

28

ON: 1 or less

OFF: 10 — 13

ON: 1 or less

OFF: 12 — 14

 — 

Drain valve

B136

17

ON: 1 or less

OFF: 10 — 13

ON: 1 or less

OFF: 12 — 14

 — 

CAN communication line (+)

B136

27

2.5 — 3.5

2.5 — 3.5

Waveform

CAN communication line (–)

B136

35

1.5 — 2.5

1.5 — 2.5

Waveform

AT/MT identification line

B136

15

 — 

 — 

MT model: 1 or less

Contents

Connector 

No.

Terminal 

No.

Signal (V)

Note

Ignition SW ON

(engine OFF)

Engine ON

(idling)

EN(H4SO)(diag)-21

Engine Control Module (ECM) I/O Signal

ENGINE (DIAGNOSTICS)

Input/output name

Measuring condition

Waveform

1. Crankshaft position sensor

At idling

2. Camshaft position sensor

At idling

EN-05322

ONE CRANK ROTATION

5V

10ms

0

EN-05323

ONE CAM ROTATION

5V

50ms

0

EN(H4SO)(diag)-22

Engine Control Module (ECM) I/O Signal

ENGINE (DIAGNOSTICS)

EN-06829

JOINT

CONNECTOR

MT

1

9

14

3

AT

1

POWER STEERING

OIL PRESSURE 

SWITCH

DELIVERY (TEST) 

MODE CONNECTOR

A

CCELERA

T

OR PED

AL

POSITION SENSOR

JOINT
CONNECTOR 

NEUTRAL
POSITION SWITCH

INHIBITOR 

SWITCH

CLUTCH

SWITCH

STARTER 

RELAY

IGNITION SWITCH

STARTER MOTOR

FUEL

PUMP

FUEL

PUMP

CONDENSER

FUEL

PUMP

RELAY

C25

C16

C6

B21

B29

B22

B32

B30

B31

B27

B23

M/B FUSE No. 13

M/B FUSE No. 11

F/B FUSE No. 4

F/B FUSE No. 21

F/B FUSE No. 12

MT

MT

MT

MT

DATA LINK 

CONNECTOR

MT

MT

AT

CLUTCH

START 

SWITCH

A33

C32

B5

B19

C12

C31

C20

FUEL TANK 

PRESSURE SENSOR

 : SEDAN MODEL

 :

SD

SD

SD