Subaru Legacy (2005 year). Manual - part 464

EN(H6DO)(diag)-169

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK HARNESS BETWEEN OIL TEMPER-
ATURE SENSOR AND ECM CONNECTOR.
1) Disconnect the ECM connector and oil tem-
perature sensor connector.
2) Measure the resistance of harness 
between oil temperature sensor connector and 
engine ground.

Connector & terminal

(B136) No. 27 — Engine ground:
(B136) No. 35 — Engine ground:

Is the resistance more than 1 
M

Ω?

Go to step 2.

Repair the ground 
short circuit 
between ECM and 
oil temperature 
sensor connector.

2

CHECK POOR CONTACT.
Check poor contact in oil temperature sensor 
connector.

Is there poor contact in oil tem-
perature sensor connector?

Repair the poor 
contact.

Replace the oil 
temperature sen-
sor. <Ref. to 
FU(H6DO)-29, Oil 
Temperature Sen-
sor.>

EN(H6DO)(diag)-170

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AV:DTC P0198 ENGINE OIL TEMPERATURE SENSOR HIGH

DTC DETECTING CONDITION:
Immediately at fault recognition
TROUBLE SYMPTOM:
• Hard to start
• Erroneous idling
• 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-03500

E75

E2

B21

B136

ECM

B83

1

19

35

E1

B20

2

3

27

*

  : TERMINAL No. 
    RANDOM ARRANGEMENT

*

*

E75

1 2

B20

1 2 3 4
5 6 7 8
9 10 11 12

13 14 15 16

B21

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

1 2 3 4
5 6 7 8

B83

OIL 

TEMPERATURE

SENSOR

EN(H6DO)(diag)-171

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK HARNESS BETWEEN OIL TEMPER-
ATURE SENSOR AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from oil tempera-
ture sensor.
3) Measure the voltage between oil tempera-
ture sensor connector and engine ground.

Connector & terminal

(E75) No. 2 (+) — Engine ground (

−

):

Is the voltage more than 10 V? Repair the battery 

short circuit of har-
ness between 
ECM and oil tem-
perature sensor 
connector.

Go to step 2.

2

CHECK HARNESS BETWEEN OIL TEMPER-
ATURE SENSOR AND ECM CONNECTOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between oil tempera-
ture sensor connector and engine ground.

Connector & terminal

(E75) No. 2 (+) — Engine ground (

−

):

Is the voltage more than 10 V? Repair the battery 

short circuit of har-
ness between 
ECM and oil tem-
perature sensor 
connector.

Go to step 3.

3

CHECK HARNESS BETWEEN OIL TEMPER-
ATURE SENSOR AND ECM CONNECTOR.
Measure the voltage between oil temperature 
sensor connector and engine ground.

Connector & terminal

(E75) No. 2 (+) — Engine ground (

−

):

Is the voltage more than 4 V?

Go to step 4.

Repair the har-
ness and connec-
tor.

NOTE:
In this case, repair
the following:
• Open circuit of 
harness between 
ECM and oil tem-
perature sensor 
connector
• Poor contact in 
oil temperature 
sensor connector
• Poor contact in 
ECM connector
• Poor contact in 
coupling connector

4

CHECK HARNESS BETWEEN OIL TEMPER-
ATURE SENSOR AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance of harness 
between oil temperature sensor connector and 
engine ground.

Connector & terminal

(E75) No. 1 — Engine ground:

Is the resistance less than 5 
Ω?

Replace the oil 
temperature sen-
sor. <Ref. to 
FU(H6DO)-29, Oil 
Temperature Sen-
sor.>

Repair the har-
ness and connec-
tor.

NOTE:
In this case, repair
the following:
• Open circuit of 
harness between 
ECM and oil tem-
perature sensor 
connector
• Poor contact in 
oil temperature 
sensor connector
• Poor contact in 
ECM connector
• Poor contact in 
coupling connector
• Poor contact in 
joint connector

EN(H6DO)(diag)-172

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AW:DTC P0222 THROTTLE/PEDAL POSITION SENSOR/SWITCH “B” CIRCUIT 

LOW

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

EN-03499

SBF-7

B135

B:

B137

B136

D:

B362

E1

B20

B83

B122

C:

E

E

E

D6

B35

38

39

20

19

16

15

*
*

E2

B21

E57

4

6

1

2

3

5

D4

D5

C35

C16

B1

B4

D1

D2

D3

36

35

37

C29

C18

ECM

5
6

B362

B20

B21

E57

B122

B83

B138

1 2

7 8

3
4

5
6

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

34 35

36 37 38 39 40 41

48 49

50 51 52 53 54

42 43

44 45

46 47

26 27 28 29 30 31 32 33

1 2 3 4
5 6 7 8

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

1

2

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

7

32 33 34 35

B136

C:

B137

D:

BATTERY

MAIN RELAY

ELECTRONIC
THROTTLE 
CONTROL RELAY

ELECTRONIC
THROTTLE CONTROL

1 2 3 4
5 6 7 8
9 10 11 12

13 14 15 16

1 2 3 4 5 6

*

*

1

*

2

*

2

1

1

1

*

1  : TERMINAL No. 

   RANDOM ARRANGEMENT

B135

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

B:

8

7

RHD

RHD

LHD

*

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

2

B122

B138

: LHD

: RHD