Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 280

EN(H4DOTC)(diag)-344

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

Step

Check

Yes

No

1

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

Connector & terminal

(B134) No. 7 (+) — Chassis ground (–):
(B134) No. 15 (+) — 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 RH
connector.

2

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

Connector & terminal

(B134) No. 7 — (E63) No. 1:
(B134) No. 15 — (E63) 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 RH
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 RH
connector.

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

EN(H4DOTC)(diag)-345

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

EG:DTC P2092 INTAKE CAMSHAFT POSITION ACTUATOR CONTROL CIRCUIT

LOW (BANK 2)

DTC DETECTING CONDITION:

• Immediately at fault recognition

• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-238, DTC P2092 INTAKE CAMSHAFT POSITION AC-

TUATOR 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, without SI-DRIVE <Ref. to WI-32, WITHOUT SI-DRIVE, WIRING DIAGRAM,

Engine Electrical System.>

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

Electrical System.>

ECM

E38

E37

1 2

7

1

6

1

B134

4

3

7

2

2

2

1

2

B21

E2

3

3

2

3

2

1

E38

2

1

E37

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-09254

INTAKE OIL FLOW

CONTROL SOLENOID

VALVE LH

INTAKE OIL FLOW

CONTROL SOLENOID

VALVE RH

EN(H4DOTC)(diag)-346

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. 17 — (E37) No. 1:
(B134) No. 16 — (E37) 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. 17 — Chassis ground:
(B134) No. 16 — 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 ME(STI)-
61, Camshaft.>
<Ref. to ME(w/o
STI)-59, Cam-
shaft.>

EN(H4DOTC)(diag)-347

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

EH:DTC P2093 INTAKE CAMSHAFT POSITION ACTUATOR CONTROL CIRCUIT

HIGH (BANK 2)

DTC DETECTING CONDITION:

• Immediately at fault recognition

• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-238, DTC P2093 INTAKE CAMSHAFT POSITION AC-

TUATOR 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, without SI-DRIVE <Ref. to WI-32, WITHOUT SI-DRIVE, WIRING DIAGRAM,

Engine Electrical System.>

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

Electrical System.>

ECM

E38

E37

1 2

7

1

6

1

B134

4

3

7

2

2

2

1

2

B21

E2

3

3

2

3

2

1

E38

2

1

E37

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-09254

INTAKE OIL FLOW

CONTROL SOLENOID

VALVE LH

INTAKE OIL FLOW

CONTROL SOLENOID

VALVE RH