Subaru Legacy (2005 year). Manual - part 449

EN(H6DO)(diag)-109

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK HARNESS BETWEEN ECM AND OIL 
SWITCHING SOLENOID VALVE.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM and oil 
switching solenoid valve.
3) Measure the resistance between oil switch-
ing solenoid valve and engine ground.

Connector & terminal

(E70) No. 1 — Engine ground:
(E70) No. 2 — Engine ground:

Is the resistance more than 1 
M

Ω?

Go to step 2.

Repair the short 
circuit between 
ECM and oil 
switching solenoid 
valve connector.

2

CHECK OIL SWITCHING SOLENOID VALVE.
1) Remove the oil switching solenoid valve 
connector.
2) Measure the resistance between oil switch-
ing solenoid valve terminals.

Terminal

No. 1 — No. 2:

Is the resistance 6 — 12 

Ω

Repair the poor 
contact in ECM 
and oil switching 
solenoid valve.

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

EN(H6DO)(diag)-110

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

S: DTC P0101 MASS OR VOLUME AIR FLOW CIRCUIT RANGE/PERFOR-

MANCE

DTC DETECTING CONDITION:
Detects when malfunction occurs in 2 continuous driving cycles.
TROUBLE SYMPTOM:
• Erroneous idling
• Engine stalls.
• Poor driving performance

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, Inspection 
Mode.>.
WIRING DIAGRAM:

EN-03496

B83

B3

BATTERY

E

B83

1

B3

MASS AIR FLOW AND INTAKE 
AIR TEMPERATURE SENSOR

ECM

B136

SBF-7

1 2 3 4 5

3

4

1

2

5

6

B136

B47

*

*

2

4

3

5

31

13

23

35

32

MAIN  RELAY

B47

1 2 3 4
5 6 7 8

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

6
4

 : TERMINAL No.
   RANDOM ARRANGEMENT

*

EN(H6DO)(diag)-111

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK ANY OTHER DTC ON DISPLAY.

Is any other DTC displayed?

Inspect the rele-
vant DTC using 
“List of Diagnostic 
Trouble Code 
(DTC)”. <Ref. to 
EN(H6DO)(diag)-
66, List of Diag-
nostic Trouble 
Code (DTC).>

NOTE:
In this case, it is
not necessary to
inspect DTC
P0101.

Replace the mass 
air flow and intake 
air temperature 
sensor. <Ref. to 
FU(H6DO)-24, 
Mass Air Flow and 
Intake Air Temper-
ature Sensor.>

EN(H6DO)(diag)-112

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

T: DTC P0102 MASS OR VOLUME AIR FLOW CIRCUIT LOW INPUT

DTC DETECTING CONDITION:
Immediately at fault recognition
TROUBLE SYMPTOM:
• Erroneous idling
• Engine stalls.
• Poor driving performance

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-03496

B83

B3

BATTERY

E

B83

1

B3

MASS AIR FLOW AND INTAKE 
AIR TEMPERATURE SENSOR

ECM

B136

SBF-7

1 2 3 4 5

3

4

1

2

5

6

B136

B47

*

*

2

4

3

5

31

13

23

35

32

MAIN  RELAY

B47

1 2 3 4
5 6 7 8

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

6
4

 : TERMINAL No.
   RANDOM ARRANGEMENT

*