Subaru Legacy (2005 year). Manual - part 451

EN(H6DO)(diag)-117

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

V: DTC P0107 MANIFOLD ABSOLUTE PRESSURE/BAROMETRIC PRESSURE 

CIRCUIT LOW INPUT

DTC DETECTING CONDITION:
Immediately at fault recognition

CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H6DO)(diag)-41, 
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)(diag)-34, PROCEDURE, 
Inspection Mode.>.
WIRING DIAGRAM:

EN-03497

35

22

16

MANIFOLD

ABSOLUTE
PRESSURE

SENSOR

19

20

7

B21

E2

1

3

2

E28

ECM

B21

B136

B83

B122

1 2 3 4
5 6 7 8

B122

B83

1 2 3 4

12 13 14 15

5 6 7 8

16 17 18 19

9 10 11

20 21 22

23 24 25 26 27 28 29 30 31 32 33

35

34

37

36

39

38

41

40

43

42

44

45

47

46

49

48

51

50

53

52

54

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

5

8

1

E77

E76

E28

1 2 3

*

: TERMINAL No. RANDOM ARRANGEMENT

E77

1 2

3 4

5

6

7

8

9

10

RHD

RHD

LHD

*

*

1

*

2

*

2

1

*

: TERMINAL No. RANDOM ARRANGEMENT 
  AMONG 3, 4, 7, AND 8

2

1

EN(H6DO)(diag)-118

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK CURRENT DATA.
1) Start the engine.
2) Read the data of intake manifold absolute 
pressure signal using Subaru Select Monitor or 
general scan tool.

NOTE:

• Subaru Select Monitor
For detailed operation procedure, refer to 
“READ CURRENT DATA FOR ENGINE”. <Ref. 
to EN(H6DO)(diag)-26, Subaru Select Moni-
tor.>
• General scan tool
For detailed operation procedure, refer to the 
general scan tool operation manual.

Is the value less than 13.3 kPa 
(100 mmHg, 3.94 inHg)?

Go to step 3.

Go to step 2.

2

CHECK POOR CONTACT.
Check poor contact in ECM and manifold 
absolute pressure sensor connector.

Is there poor contact in ECM or 
manifold absolute pressure 
sensor connector?

Repair the poor 
contact in ECM or 
manifold absolute 
pressure sensor 
connector.

Even if the mal-
function indicator 
light illuminates, 
the circuit has 
returned to a nor-
mal condition at 
this time.

3

CHECK OUTPUT SIGNAL FROM ECM.
Measure the voltage between ECM connector 
and chassis ground.

Connector & terminal

(B136) No. 16 (+) — Chassis ground (

−

):

Is the voltage more than 4.5 V? Go to step 5.

Go to step 4.

4

CHECK OUTPUT SIGNAL OF ECM.
Measure the voltage between ECM connector 
and chassis ground.

Connector & terminal

(B136) No. 16 (+) — Chassis ground (

−

):

Does the voltage change by 
shaking the ECM harness and 
connector?

Repair the poor 
contact in ECM 
connector.

Replace the ECM. 
<Ref. to 
FU(H6DO)-34, 
Engine Control 
Module (ECM).>

5

CHECK INPUT SIGNAL OF ECM.
Measure the voltage between ECM and chas-
sis ground.

Connector & terminal

(B136) No. 22 (+) — Chassis ground (

−

):

Is the voltage less than 0.2 V? Go to step 7.

Go to step 6.

6

CHECK INPUT SIGNAL OF ECM (USING 
SUBARU SELECT MONITOR).
Read the data of atmospheric absolute pres-
sure signal using Subaru Select Monitor.

NOTE:

For detailed operation procedure, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H6DO)(diag)-26, Subaru Select Moni-
tor.>

Is the value more than 13.3 
kPa (100 mmHg, 3.94 inHg) 
when shaking the ECM har-
ness and connector?

Repair the poor 
contact in ECM 
connector.

Go to step 7.

7

CHECK HARNESS BETWEEN ECM AND 
MANIFOLD ABSOLUTE PRESSURE SEN-
SOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from manifold 
absolute pressure sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between manifold 
absolute pressure sensor connector and 
engine ground.

Connector & terminal

(E28) No. 3 (+) — Engine ground (

−

):

Is the voltage more than 4.5 V? Go to step 8.

Repair the open 
circuit of harness 
between ECM and 
manifold absolute 
pressure sensor 
connector.

EN(H6DO)(diag)-119

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

8

CHECK HARNESS BETWEEN ECM AND 
MANIFOLD ABSOLUTE PRESSURE SEN-
SOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance of harness 
between ECM and manifold absolute pressure 
sensor connector.

Connector & terminal

(B136) No. 35 — (E28) No. 1:

Is the resistance less than 1 
Ω?

Go to step 9.

Repair the open 
circuit of harness 
between ECM and 
manifold absolute 
pressure sensor 
connector.

9

CHECK POOR CONTACT.
Check poor contact in manifold absolute pres-
sure sensor connector.

Is there poor contact in mani-
fold absolute pressure sensor 
connector?

Repair the poor 
contact in mani-
fold absolute pres-
sure sensor 
connector.

Replace the mani-
fold absolute pres-
sure sensor. <Ref. 
to FU(H6DO)-23, 
Manifold Absolute 
Pressure Sensor.>

Step

Check

Yes

No

EN(H6DO)(diag)-120

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

W: DTC P0108 MANIFOLD ABSOLUTE PRESSURE/BAROMETRIC PRESSURE 

CIRCUIT HIGH INPUT

DTC DETECTING CONDITION:
Immediately at fault recognition

CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H6DO)(diag)-41, 
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)(diag)-34, PROCEDURE, 
Inspection Mode.>.
WIRING DIAGRAM:

EN-03497

35

22

16

MANIFOLD

ABSOLUTE
PRESSURE

SENSOR

19

20

7

B21

E2

1

3

2

E28

ECM

B21

B136

B83

B122

1 2 3 4
5 6 7 8

B122

B83

1 2 3 4

12 13 14 15

5 6 7 8

16 17 18 19

9 10 11

20 21 22

23 24 25 26 27 28 29 30 31 32 33

35

34

37

36

39

38

41

40

43

42

44

45

47

46

49

48

51

50

53

52

54

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

5

8

1

E77

E76

E28

1 2 3

*

: TERMINAL No. RANDOM ARRANGEMENT

E77

1 2

3 4

5

6

7

8

9

10

RHD

RHD

LHD

*

*

1

*

2

*

2

1

*

: TERMINAL No. RANDOM ARRANGEMENT 
  AMONG 3, 4, 7, AND 8

2

1