Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 281

EN(H4DOTC)(diag)-348

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK HARNESS BETWEEN ECM AND OIL
FLOW CONTROL SOLENOID VALVE LH
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
oil flow control solenoid valve LH.
3) Measure the voltage between ECM connec-
tor and chassis ground.

Connector & terminal

(B134) No. 17 (+) — Chassis ground (–):
(B134) No. 16 (+) — Chassis ground (–):

Is the voltage less than 1 V?

Go to step

2.

Repair the short
circuit to power in
harness between
ECM connector
and oil flow control
solenoid valve LH
connector.

2

CHECK HARNESS BETWEEN ECM AND OIL
FLOW CONTROL SOLENOID VALVE LH
CONNECTOR.
Measure the resistance of harness between
ECM connector and oil flow control solenoid
valve LH connector.

Connector & terminal

(B134) No. 17 — (E37) No. 1:
(B134) No. 16 — (E37) No. 2:

Is the resistance less than 1 Ω? Go to step

3.

Repair the harness
and connector.
NOTE:

In this case, repair
the following item:
• Open circuit in
harness between
ECM

connector

and oil flow control
solenoid valve LH
connector
• Poor contact of
coupling connector

3

CHECK OIL FLOW CONTROL SOLENOID
VALVE.
Measure the resistance between oil flow control
solenoid valve terminals.

Terminals

No. 1 — No. 2:

Is the resistance 6 — 12 Ω?

Repair the poor
contact of ECM
and oil flow control
solenoid valve LH
connector.

Replace the oil
flow control sole-
noid valve LH.
<Ref. to ME(STI)-
61, Camshaft.>
<Ref. to ME(w/o
STI)-59, Cam-
shaft.>

EN(H4DOTC)(diag)-349

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

EI: DTC P2094 EXHAUST CAMSHAFT POSITION ACTUATOR CONTROL CIR-

CUIT LOW (BANK 2)

DTC DETECTING CONDITION:

• Immediately at fault recognition

• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-238, DTC P2094 EXHAUST CAMSHAFT POSITION

ACTUATOR CONTROL CIRCUIT LOW (BANK 2), Diagnostic Trouble Code (DTC) Detecting Criteria.>

TROUBLE SYMPTOM:

Improper idling
CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-63,

OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-49, PROCE-

DURE, Inspection Mode.>.

WIRING DIAGRAM:

Engine electrical system, with SI-DRIVE <Ref. to WI-48, WITH SI-DRIVE, WIRING DIAGRAM, Engine Elec-

trical System.>

ECM

E66

E63

1 2

5

14

B134

7

15

17

7

B21

E2

43

42

2

1

E63

2

1

E66

18

27

19 20 21 22 23

26

24 25

28 29

33

32

34

30 31

9

8

15

14

13

12

11

10

17

16

1

2

3

4

5

6

7

B134

15 16 17 18 19 20 21 22

23 24 25 26 27 28 29 30 31 32 33

13 14

11

12

9 10

7 8

5 6

3 4

1 2

34 35 36 37 38 39 40 41
42 43

44 45

46 47

48 49 50 51 52 53 54

B21

EN-09255

EXHAUST OIL FLOW

CONTROL

SOLENOID VALVE LH

EXHAUST OIL FLOW

CONTROL

SOLENOID VALVE RH

EN(H4DOTC)(diag)-350

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK HARNESS BETWEEN ECM AND OIL
FLOW CONTROL SOLENOID VALVE LH
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
oil flow control solenoid valve LH.
3) Measure the resistance of harness between
ECM connector and oil flow control solenoid
valve LH connector.

Connector & terminal

(B134) No. 5 — (E66) No. 1:
(B134) No. 14 — (E66) No. 2:

Is the resistance less than 1 Ω? Go to step

2.

Repair the harness
and connector.
NOTE:

In this case, repair
the following item:
• Open circuit in
harness between
ECM

connector

and oil flow control
solenoid valve LH
connector
• Poor contact of
coupling connector

2

CHECK HARNESS BETWEEN ECM AND OIL
FLOW CONTROL SOLENOID VALVE LH
CONNECTOR.
Measure the resistance between ECM connec-
tor and chassis ground.

Connector & terminal

(B134) No. 5 — Chassis ground:
(B134) No. 14 — Chassis ground:

Is the resistance 1 MΩ or
more?

Go to step

3.

Repair the short
circuit to ground in
harness between
ECM connector
and oil flow control
solenoid valve LH
connector.

3

CHECK OIL FLOW CONTROL SOLENOID
VALVE.
Measure the resistance between oil flow control
solenoid valve terminals.

Terminals

No. 1 — No. 2:

Is the resistance 6 — 12 Ω?

Repair the poor
contact of ECM
and oil flow control
solenoid valve LH
connector.

Replace the oil
flow control sole-
noid valve LH.
<Ref. to FU(STI)-
50, Oil Flow Con-
trol Solenoid
Valve.>

EN(H4DOTC)(diag)-351

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

EJ:DTC P2095 EXHAUST CAMSHAFT POSITION ACTUATOR CONTROL CIR-

CUIT HIGH (BANK 2)

DTC DETECTING CONDITION:

• Immediately at fault recognition

• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-238, DTC P2095 EXHAUST CAMSHAFT POSITION

ACTUATOR CONTROL CIRCUIT HIGH (BANK 2), Diagnostic Trouble Code (DTC) Detecting Criteria.>

TROUBLE SYMPTOM:

Improper idling
CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-63,

OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-49, PROCE-

DURE, Inspection Mode.>.

WIRING DIAGRAM:

Engine electrical system, with SI-DRIVE <Ref. to WI-48, WITH SI-DRIVE, WIRING DIAGRAM, Engine Elec-

trical System.>

ECM

E66

E63

1 2

5

14

B134

7

15

17

7

B21

E2

43

42

2

1

E63

2

1

E66

18

27

19 20 21 22 23

26

24 25

28 29

33

32

34

30 31

9

8

15

14

13

12

11

10

17

16

1

2

3

4

5

6

7

B134

15 16 17 18 19 20 21 22

23 24 25 26 27 28 29 30 31 32 33

13 14

11

12

9 10

7 8

5 6

3 4

1 2

34 35 36 37 38 39 40 41
42 43

44 45

46 47

48 49 50 51 52 53 54

B21

EN-09255

EXHAUST OIL FLOW

CONTROL

SOLENOID VALVE LH

EXHAUST OIL FLOW

CONTROL

SOLENOID VALVE RH