Subaru Legacy (2005 year). Manual - part 233

EN(H4SO 2.5)(diag)-217

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

BY:DTC P2017 INTAKE MANIFOLD RUNNER POSITION SENSOR / SWITCH 

CIRCUIT HIGH (BANK 1)

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(H4SO 2.5)(diag)-
40, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.5)(diag)-33, Inspection Mode.>.
WIRING DIAGRAM:

EN-03467

E2

E54

B21

TUMBLE GENERATOR VALVE
      POSITION SENSOR RH

B136 ECM

B136

E54

1 2 3

B21

B138

B122

B83

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

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

E2

B21

B83

B122 : RHD

B138 : LHD

20

10

19

16

35

27

1

3

2

*

: TERMINAL No. RANDOM ARRANGEMENT

1

*

: TERMINAL No. RANDOM ARRANGEMENT
  AMONG 1,2,5, AND 6

2

2

2

*

*

*

*

1
1

EN(H4SO 2.5)(diag)-218

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 tumble generator valve 
position sensor 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(H4SO 2.5)(diag)-25, Subaru Select 
Monitor.>
• General scan tool
For detailed operation procedure, refer to the 
general scan tool operation manual.

Is the voltage more than 4.9 V? Go to step 2.

Even if the mal-
function indicator 
light illuminates, 
the circuit has 
returned to a nor-
mal condition at 
this time. A tempo-
rary poor contact 
of the connector 
may be the cause.

NOTE:
In this case, repair
the following:
• Poor contact in 
tumble generator 
valve position sen-
sor connector
• Poor contact in 
ECM connector
• Poor contact in 
coupling connector

2

CHECK HARNESS BETWEEN TUMBLE 
GENERATOR VALVE POSITION SENSOR 
CONNECTOR AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from tumble gen-
erator valve position sensor.
3) Measure the resistance of harness 
between tumble generator valve position sen-
sor connector and engine ground.

Connector & terminal

(E54) No. 2 — Engine ground:

Is the resistance less than 5 
Ω?

Go to step 3.

Repair the har-
ness and connec-
tor.

NOTE:
In this case, repair
the following:
• Open circuit of 
harness between 
tumble generator 
valve position sen-
sor and ECM con-
nector
• Poor contact in 
coupling connector
• Poor contact in 
joint connector

3

CHECK HARNESS BETWEEN TUMBLE 
GENERATOR VALVE POSITION SENSOR 
CONNECTOR AND ECM CONNECTOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between tumble gen-
erator valve position sensor connector and 
engine ground.

Connector & terminal

(E54) No. 3 (+) — Engine ground (

−

):

Is the voltage more than 4.9 V? Repair the battery 

short circuit of har-
ness between tum-
ble generator valve 
position sensor 
and ECM connec-
tor. After repair, 
replace the ECM. 
<Ref. to FU(H4SO 
2.5)-37, Engine 
Control Module 
(ECM).>

Replace the tum-
ble generator valve 
position sensor. 
<Ref. to FU(H4SO 
2.5)-30, Tumble 
Generator Valve 
Position Sensor.>

EN(H4SO 2.5)(diag)-219

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

BZ:DTC P2021 INTAKE MANIFOLD RUNNER POSITION SENSOR / SWITCH CIR-

CUIT LOW (BANK 2)

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(H4SO 2.5)(diag)-
40, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.5)(diag)-33, Inspection Mode.>.
WIRING DIAGRAM:

EN-03466

E2

E50

B21

B136 ECM

TUMBLE GENERATOR VALVE
      POSITION SENSOR LH

B83

2

2

B122 : RHD

B138 : LHD

16

35

26

20

11

19

1

3

2

B136

E50

1 2 3

B21

B138

B122

B83

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

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

*

*

*

*

1
1

*

: TERMINAL No. RANDOM ARRANGEMENT

1

*

: TERMINAL No. RANDOM ARRANGEMENT
  AMONG 1,2,5, AND 6

2

EN(H4SO 2.5)(diag)-220

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 tumble generator valve 
position sensor 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(H4SO 2.5)(diag)-25, Subaru Select 
Monitor.>
• General scan tool
For detailed operation procedure, refer to the 
general scan tool operation manual.

Is the voltage less than 0.1 V? Go to step 2.

Even if the mal-
function indicator 
light illuminates, 
the circuit has 
returned to a nor-
mal condition at 
this time. A tempo-
rary poor contact 
of the connector 
may be the cause.

NOTE:
In this case, repair
the following:
• Poor contact in 
tumble generator 
valve position sen-
sor connector
• Poor contact in 
ECM connector
• Poor contact in 
coupling connector

2

CHECK INPUT SIGNAL OF 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 4.

Go to step 3.

3

CHECK INPUT 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 harness and con-
nector of ECM while monitor-
ing the value with voltage 
meter?

Repair the poor 
contact in ECM 
connector.

Contact the SUB-
ARU dealer.

4

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

Connector & terminal

(B136) No. 26 (+) — Chassis ground (

−

):

Is the voltage less than 0.1 V? Go to step 6.

Go to step 5.

5

CHECK INPUT SIGNAL OF ECM (USING 
SUBARU SELECT MONITOR).
Measure the voltage between ECM connector 
and chassis ground.

Does the voltage change by 
shaking the harness and con-
nector of ECM while monitor-
ing the value with Subaru 
Select Monitor?

Repair the poor 
contact in ECM 
connector.

Go to step 6.