Subaru Legacy III (2000-2003 year). Service manual — part 462

EN(H4DOSTC)-18

ENGINE (DIAGNOSTICS)

ELECTRICAL COMPONENTS LOCATION

• SENSOR

(1) Rear vehicle speed sensor (for AT vehicles)
(2) Front vehicle speed sensor (for MT vehicles)
(3) Front vehicle speed sensor (for AT vehicles)
(4) Torque converter turbine speed sensor
(5) ATF temperature sensor (for AT vehicles)
(6) Brake light switch

EN-00881

( 1 )

( 3 )

EN-00882

( 2 )

EN-00883

( 4 )

EN-00884

( 5 )

EN-00885

( 6 )

EN(H4DOSTC)-19

ENGINE (DIAGNOSTICS)

ELECTRICAL COMPONENTS LOCATION

• SOLENOID VALVE AND SWITCH (AT VEHICLES)

(1) Dropping resistor
(2) Inhibitor switch
(3) Shift solenoid valve 1
(4) Shift solenoid valve 2
(5) Line pressure duty solenoid
(6) Lock-up duty solenoid
(7) Transfer duty solenoid
(8) 2-4 brake duty solenoid
(9) Low clutch timing solenoid valve
(10) 2-4 brake timing solenoid valve

• SOLENOID VALVE AND SWITCH (MT VEHICLES)

(1) Neutral position switch

EN-00886

( 1 )

EN-00887

( 2 )

EN-00888

( 3 )

( 4 )

( 5 )

( 6 )

( 8 )

( 9 )

(10)

EN-00889

( 7 )

EN-00996

( 1 )

EN(H4DOSTC)-20

ENGINE (DIAGNOSTICS)

ENGINE CONTROL MODULE (ECM) I/O SIGNAL

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

A: ELECTRICAL SPECIFICATION

Content

Con-

nector

No.

Termi-

nal No.

Signal (V)

Note

Ignition SW ON

(Engine OFF)

Engine ON (Idling)

Crank-
shaft posi-
tion sensor

Signal (+)

B135

2

0

−

7 — +7

Sensor output waveform

Signal (

−

)

B135

11

0

0

—

Shield

B135

21

0

0

—

Camshaft
position
sensor

Signal (+)

B135

1

0

−

7 — +7

Sensor output waveform

Signal (

−

)

B135

10

0

0

—

Shield

B135

21

0

0

—

Throttle
position
sensor

Signal

B135

7

Fully closed: 0.2 — 1.0

Fully opened: 4.2 — 4.7

—

Power
supply

B135

9

5

5

—

GND (sen-
sor)

B135

19

0

0

—

Rear oxy-
gen sen-
sor

Signal

B135

17

0

0 — 0.9

—

Shield

B135

26

0

0

—

GND (sen-
sor)

B135

19

0

0

—

Front oxy-
gen (A/F)
sensor
heater

Signal 1

B137

4

0 — 1.0

0 — 1.0

—

Signal 2

B137

5

0 — 1.0

0 — 1.0

—

Rear oxygen sensor
heater signal

B136

13

0 — 1.0

0 — 1.0

—

Engine
coolant
tempera-
ture sen-
sor

Signal

B135

18

1.0 — 1.4

1.0 — 1.4

After warm-up the engine.

GND (sen-
sor)

B135

19

0

0

After warm-up the engine.

Vehicle speed signal

B134

1

0 or 5

0 or 5

“5” and “0” are repeatedly dis-
played when the vehicle is
driven.

EN-00997

B134

To

1

2

3

4

10

11

12
19

20

21

13

5

6

14

15

7

8

9

16

17

18

22

B135

To

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

To

B136

1

2

7

8

9

5

6

3

4

10

11

12

19

20

21

13

14

15

16

17

18

22

23

24

To

B137

1

2

7

8

9

5

6

3

4

10

11

12

19

20

21

29

30

31

13

14

15

16

17

27

28

18

22

23

24

25

26

B84

To

1

2

3

8

9

10

4

11

12

13

14

15

16

5

6

7

17

EN(H4DOSTC)-21

ENGINE (DIAGNOSTICS)

ENGINE CONTROL MODULE (ECM) I/O SIGNAL

Mass air
flow sen-
sor

Signal

B84

13

—

0.3 — 4.5

—

Shield

B84

8

0

0

—

GND

B84

7

0

0

—

Intake air temperature
sensor signal

B135

27

—

—

—

Wastegate control sole-
noid valve

B137

24

10 — 13

13 — 14

—

Starter switch

B134

16

0

0

Cranking: 8 — 14

A/C switch

B134

6

ON: 10 — 13

OFF: 0

ON: 13 — 14

OFF: 0

—

Ignition switch

B134

14

10 — 13

13 — 14

—

Neutral position switch
(MT)

B134

8

ON: 12

±

0.5

OFF: 0

Switch is ON when gear is in
neutral position.

Neutral position switch
(AT)

B134

8

ON: 0

OFF: 12

±

0.5

Switch is ON when shift is in “N”
or “P” position.

Test mode connector

B134

5

5

5

When connected: 0

Knock
sensor

Signal

B135

4

2.8

2.8

—

Shield

B135

22

0

0

—

Back-up power supply

B137

10

10 — 13

13 — 14

Ignition switch “OFF”: 10 — 13

Control unit power sup-
ply

B137

2

10 — 13

13 — 14

—

B137

3

10 — 13

13 — 14

—

Sensor power supply

B135

9

5

5

—

Line end check

B134

10

0

0

—

Ignition
control

#1

B136

24

0

13 — 14

Waveform

#2

B136

23

0

13 — 14

Waveform

#3

B136

22

0

13 — 14

Waveform

#4

B136

21

0

13 — 14

Waveform

Fuel injec-
tor

#1

B137

1

10 — 13

1 — 14

Waveform

#2

B136

6

10 — 13

1 — 14

Waveform

#3

B136

5

10 — 13

1 — 14

Waveform

#4

B136

4

10 — 13

1 — 14

Waveform

Idle air
control
solenoid
valve

Signal

B136

10

0 or 13 — 14

0 or 13 — 14

Waveform

Fuel pump
controller

Signal 1

B134

13

—

—

—

Signal 2

B136

16

—

—

—

A/C relay control

B137

27

ON: 0.5, or less

OFF: 10 — 13

ON: 0.5, or less

OFF: 13 — 14

—

Radiator fan relay 1
control

B137

17

ON: 0.5, or less

OFF: 10 — 13

ON: 0.5, or less

OFF: 13 — 14

—

Radiator fan relay 2
control

B137

28

ON: 0.5, or less

OFF: 10 — 13

ON: 0.5, or less

OFF: 13 — 14

With A/C vehicles only

Malfunction indicator
lamp

B137

15

—

—

Light “ON”: 1, or less
Light “OFF”: 10 — 14

Engine speed output

B136

9

—

0 — 13, or more

Waveform

Torque control signal 1

B134

19

5

5

—

Torque control signal 2

B134

18

5

5

—

Torque control cut sig-
nal

B136

14

8

8

—

Purge control solenoid
valve

B137

16

ON: 1, or less

OFF: 10 — 13

ON: 1, or less

OFF: 13 — 14

—

Content

Con-

nector

No.

Termi-

nal No.

Signal (V)

Note

Ignition SW ON

(Engine OFF)

Engine ON (Idling)