Subaru Legacy (2005 year). Service manual — part 312

EN(H4DOTC)(diag)-17

ENGINE (DIAGNOSTICS)

Engine Control Module (ECM) I/O Signal

GND (front oxygen (A/F)
sensor heater 1)

B134

7

0

0

—

GND (front oxygen (A/F)
sensor heater 2)

B134

6

0

0

—

Intake camshaft position
sensor (LH)

B135

8

0 or 5

0 or 5

Waveform

Intake camshaft position
sensor (RH)

B135

9

0 or 5

0 or 5

Waveform

Electronic
throttle control

Main

B136

18

0.64 — 0.72

Fully opened: 3.96

0.64 — 0.72

(After engine is

warmed-up.)

Fully closed: 0.6 Fully

opened: 3.96

Sub

B136

29

1.51 — 1.58

Fully opened: 4.17

1.51 — 1.58

(After engine is

warmed-up.)

Fully closed: 1.48 Fully

opened: 4.17

Power
supply

B136

16

5

5

—

Ground
(sensor)

B136

35

0

0

—

Electronic throttle control
motor (+)

B137

5

Duty waveform

Duty waveform

Drive frequency: 500 Hz

Electronic throttle control
motor (

−)

B137

4

Duty waveform

Duty waveform

Drive frequency: 500 Hz

Electronic throttle control
motor power supply

B137

6

10 — 13

13 — 14

—

Electronic throttle control
motor relay

B135

35

ON: 0

OFF: 10 — 13

ON: 0

OFF: 13 — 14

When ignition switch is

turned to ON: ON

Intake AVCS
solenoid (LH)

Signal (+)

B134

19

ON: 10 — 13

OFF: 0

ON: 13 — 14

OFF: 0

—

Signal (

−)

B134

29

0

0

—

Intake AVCS
solenoid (RH)

Signal (+)

B134

18

ON: 10 — 13

OFF: 0

ON: 13 — 14

OFF: 0

—

Signal (

−)

B134

28

0

0

—

Exhaust AVCS
solenoid (LH)

Signal (+)

B134

21

ON: 10 — 13

OFF: 0

ON: 13 — 14

OFF: 0

—

Signal (

−)

B134

31

0

0

—

Exhaust AVCS
solenoid (RH)

Signal (+)

B134

20

ON: 10 — 13

OFF: 0

ON: 13 — 14

OFF: 0

—

Signal (

−)

B134

30

0

0

—

Exhaust cam-
shaft position
sensor (LH)

Signal (+)

B135

20

0

−7 — +7

Waveform

Signal (

−)

B135

28

0

0

—

Shield

B135

30

0

0

—

Exhaust cam-
shaft position
sensor (RH)

Signal (+)

B135

21

0

−7 — +7

Waveform

Signal (

−)

B135

29

0

0

—

Shield

B135

30

0

0

—

DESCRIPTION

Connector

No.

Termi-

nal

No.

Signal (V)

Reference

Ignition SW ON

(engine OFF)

Engine ON

(idling)

EN(H4DOTC)(diag)-18

ENGINE (DIAGNOSTICS)

Engine Control Module (ECM) I/O Signal

Accelerator
pedal position
sensor

Main

B136

17

Fully closed: 1

Fully opened: 3.3

Fully closed: 1

Fully opened: 3.3

—

Power
supply

B136

15

5

5

—

Ground
(sensor)

B136

34

0

0

—

Sub

B136

28

Fully closed: 1

Fully opened: 3.3

Fully closed: 1

Fully opened: 3.3

—

Shield

B137

2

0

0

—

Power
supply

B136

16

5

5

—

Ground
(sensor)

B136

35

0

0

—

Starter relay

B135

32

ON: 0

OFF: 10 — 13

ON: 0

OFF: 13 — 14

ON: Cranking

A/C middle pressure switch

B136

30

ON: 0

OFF: 10 — 13

ON: 0

OFF: 13 — 14

—

Clutch switch

B134

1

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

B136

9

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

B136

8

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

—

Cruise control command
switch

B136

11

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

—

Cruise control main switch

B136

7

ON: 0

OFF: 5

ON: 0

OFF: 5

—

DESCRIPTION

Connector

No.

Termi-

nal

No.

Signal (V)

Reference

Ignition SW ON

(engine OFF)

Engine ON

(idling)

EN(H4DOTC)(diag)-19

ENGINE (DIAGNOSTICS)

Engine Condition Data

6. Engine Condition Data

A: ELECTRICAL SPECIFICATION

Measuring condition:
• After engine is warmed-up.
• Gear position is in neutral.
• Turn the A/C to OFF.
• Turn all the accessory switches to OFF.

Remarks

Specifications

Engine load

1.2 — 2.9 (%): Idling

4.7 — 12.8 (%): 2,500 rpm racing

EN(H4DOTC)(diag)-20

ENGINE (DIAGNOSTICS)

Data Link Connector

7. Data Link Connector

A: NOTE

This connector is used for connecting the Subaru Select Monitor.

CAUTION:
Do not connect any scan tools except Subaru Select Monitor or general scan tool because the circuit
for Subaru Select Monitor may be damaged.

EN-00037

1

2

3

4

5

7

6

8

9 10 11 12 13

15

14

16

Terminal No.

Remarks

Terminal No.

Remarks

1

Power supply

9

Empty

2

Empty

10

Subaru Select Monitor signal

3

Empty

11

Empty

4

Empty

12

Ground

5

Empty

13

Ground

6

Line end check signal 1

14

Empty

7

Empty

15

Empty

8

Empty

16

Empty