Subaru Legacy IV (2008 year). Manual — part 538

EN(H6DO)(diag)-125

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

U: DTC P0083 INTAKE VALVE CONTROL SOLENOID CIRCUIT HIGH (BANK 2)

DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H6DO)-30, DTC P0083 INTAKE VALVE CONTROL SOLENOID
CIRCUIT HIGH (BANK 2), Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
Improper idling

CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H6DO)(diag)-52,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H6DO)(diag)-44, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:

EN-06871

E70

1 2

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

B21

1 2 3 4 5 6 7 8 9 10 11

12 13 14 15 16 17 18 19 20 21 22
23 24 25 26 27 28 29 30 31 32 33

34

35

42

43

36

37

38

39

48

49

50

51

52

53

54

40

41

44

45

46

47

B21

E2

B137

E70

30

2

1

30

29

31

ECM

OIL SWITCHING

SOLENOID VALVE LH

EN(H6DO)(diag)-126

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK HARNESS BETWEEN ECM AND OIL
SWITCHING SOLENOID VALVE.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from the ECM
and oil switching solenoid valve.
3) Measure the voltage between ECM and
chassis ground.

Connector & terminal

(B137) No. 31 (+) — Chassis ground (–):
(B137) No. 30 (+) — Chassis ground (–):

Is the voltage less than 1 V?

Go to step 2.

Repair the short
circuit of harness
to power supply
between ECM and
oil switching sole-
noid valve connec-
tor.

2

CHECK HARNESS BETWEEN ECM AND OIL
SWITCHING SOLENOID VALVE.
Measure the resistance between ECM and oil
switching solenoid valve connector.

Connector & terminal

(B137) No. 31 — (E70) No. 1:
(B137) No. 30 — (E70) No. 2:

Is the resistance less than 1

:? Go to step 3.

Repair the harness
and connector.

NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and oil
switching solenoid
valve connector
• Poor contact of
coupling connector

3

CHECK OIL SWITCHING SOLENOID VALVE.
Measure the resistance between oil switching
solenoid valve terminals.

Terminals

No. 1 — No. 2:

Is the resistance between 6 —
12

:?

Repair the poor
contact of ECM
and oil switching
solenoid valve con-
nector.

Replace the oil
switching solenoid
valve. <Ref. to
ME(H6DO)-80, Oil
Switching Solenoid
Valve.>

EN(H6DO)(diag)-127

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

V: DTC P0101 MASS OR VOLUME AIR FLOW CIRCUIT RANGE/PERFORMANCE

DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H6DO)-31, DTC P0101 MASS OR VOLUME AIR FLOW CIRCUIT
RANGE/PERFORMANCE, Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
• Improper idling
• Engine stalls.
• Poor driving performance

CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H6DO)(diag)-52,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H6DO)(diag)-44, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:

EN-03920

B83

B3

BATTERY

E

B83

1

B3

MASS AIR FLOW & INTAKE
AIR TEMPERATURE SENSOR

ECM

B135

SBF-7

1 2 3 4 5

3

4

1

2

5

6

B135

B47

*

*

2

4

3

5

34

18

26

30

35

MAIN RELAY

B47

1

2

4

6

3

5

1 2 3 4
5 6 7 8

*

: TERMINAL No.
OPTIONAL ARRANGEMENT

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

EN(H6DO)(diag)-128

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?

Check the appro-
priate DTC using
the “List of Diag-
nostic Trouble
Code (DTC)”.
<Ref. to
EN(H6DO)(diag)-
81, List of Diagnos-
tic Trouble Code
(DTC).>

Replace the mass
air flow and intake
air temperature
sensor. <Ref. to
FU(H6DO)-26,
Mass Air Flow and
Intake Air Temper-
ature Sensor.>