Subaru Legacy (2005 year). Manual — part 232

EN(H4SO 2.5)(diag)-213

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE ACTUATOR
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from tumble gen-
erator valve connector.
3) Measure the voltage between tumble gen-
erator valve actuator and chassis ground.

Connector & terminal

(E51) No. 1 (+) — Chassis ground (

−

):

(E51) No. 2 (+) — Chassis ground (

−

):

Is the voltage less than 5 V?

Replace the tum-
ble generator valve
actuator. <Ref. to
FU(H4SO 2.5)-29,
Tumble Generator
Valve Actuator.>

Repair the battery
short circuit
between ECM and
tumble generator
valve actuator.

EN(H4SO 2.5)(diag)-214

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

BX:DTC P2016 INTAKE MANIFOLD RUNNER POSITION SENSOR / SWITCH

CIRCUIT LOW (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)-215

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. 27 (+) — 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.

EN(H4SO 2.5)(diag)-216

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

6

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

Connector & terminal

(E54) No. 1 (+) — Engine ground (

−

):

Is the voltage more than 4.5 V? Go to step 7.

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
tumble generator
valve position sen-
sor connector
• Poor contact in
ECM connector
• Poor contact in
coupling connector
• Poor contact in
joint connector

7

CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE POSITION
SENSOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance of harness
between ECM connector and tumble generator
valve position sensor connector.

Connector & terminal

(B136) No. 27 — (E54) No. 3:

Is the resistance less than 1
Ω?

Go to step 8.

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
ECM connector
• Poor contact in
tumble generator
valve position sen-
sor connector
• Poor contact in
coupling connector

8

CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE POSITION
SENSOR CONNECTOR.
Measure the resistance of harness between
tumble generator valve position sensor con-
nector and engine ground.

Connector & terminal

(E54) No. 3 — Engine ground:

Is the resistance more than 1
M

Ω?

Go to step 9.

Repair the ground
short circuit of har-
ness between tum-
ble generator valve
position sensor
and ECM connec-
tor.

9

CHECK POOR CONTACT.
Repair the poor contact in tumble generator
valve position sensor connector.

Is there poor contact in tumble
generator valve position sen-
sor connector?

Repair the poor
contact in tumble
generator valve
position sensor
connector.

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

Step

Check

Yes

No