Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 279

EN(H4DOTC)(diag)-340

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

Step

Check

Yes

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. 34 (+) — Chassis ground (–):
(B134) No. 27 (+) — Chassis ground (–):

Is the voltage less than 1 V?

Go to step

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

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. 34 — (E38) No. 1:
(B134) No. 27 — (E38) No. 2:

Is the resistance less than 1 Ω? Go to step

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

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 ME(STI)-
61, Camshaft.>
<Ref. to ME(w/o
STI)-59, Cam-
shaft.>

EN(H4DOTC)(diag)-341

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

EE:DTC P2090 EXHAUST CAMSHAFT POSITION ACTUATOR CONTROL CIR-

CUIT LOW (BANK 1)

DTC DETECTING CONDITION:

• Immediately at fault recognition

• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-236, DTC P2090 EXHAUST CAMSHAFT POSITION

ACTUATOR CONTROL CIRCUIT LOW (BANK 1), 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

B134

B21

E63

E66

19 20 21 22 23

24 25

28 29

30 31

B134

15 16 17 18 19 20 21 22

23 24 25 26 27 28 29 30 31 32 33

13 14

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)-342

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

Step

Check

Yes

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 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

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

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

Connector & terminal

(B134) No. 7 — Chassis ground:
(B134) No. 15 — Chassis ground:

Is the resistance 1 MΩ or
more?

Go to step