Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 268

EN(H4DOTC)(diag)-296

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?

Check DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H4DOTC)(diag)
-87, List of Diagnos-
tic Trouble Code
(DTC).>

Go to step

2.

2

CHECK HARNESS BETWEEN ECM AND
STARTER RELAY CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
starter motor.
3) Remove the starter relay.
4) Measure the resistance of harness between
ECM connector and starter relay connector.

Connector & terminal

(B136) No. 16 — (B225) No. 10:

Is the resistance less than 1 Ω? Go to step

3.

Repair the open
circuit of harness
between ECM con-
nector and starter
relay connector.

3

CHECK HARNESS BETWEEN ECM AND
STARTER RELAY CONNECTOR.
Measure the resistance between ECM connec-
tor and chassis ground.

Connector & terminal

(B136) No. 16 — Chassis ground:

Is the resistance 1 MΩ or
more?

Repair the poor
contact of ECM
connector.

Repair the short
circuit to ground in
harness between
ECM connector
and starter relay
connector.

EN(H4DOTC)(diag)-297

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

DG:DTC P0617 STARTER RELAY CIRCUIT HIGH

DTC DETECTING CONDITION:

• Detected when 2 consecutive driving cycles with fault occur.

• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-200, DTC P0617 STARTER RELAY CIRCUIT HIGH,

Diagnostic Trouble Code (DTC) Detecting Criteria.>

TROUBLE SYMPTOM:

Failure of engine to start
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

13
14

15 16

17

27

24

25
26

20

21
22

23

29
30

31

28

32 35

33
34

37
38

39

36

40

8

9

10

11 12

1

2

5

3

4

7

6

19

18

B225

1
2

B106

B106

1

2

5

6

7

2

1

3

4

29

10 11 12 13 14 15

25

24

16

30

9

8

17 18 19

20
28

21 22 23

32

31

26 27

33

34 35

EN-09249

16

10 11 12 13 14 15

25

24

30

9

8

7

17 18 19 20
28

21 22 23

29

32

31

1

2

3

4

5

6

27

26

33 34 35

B72

1

3

4 5 6

2

6

2

3

B14

B72

C: B136

C: B136

B: B135

B: B135

0

1

2

1

9

1

1

B225

C16

B26

SBF-6

E

M

F/B No. 21

MAIN SBF

BATTERY

IGNITION

SWITCH

STARTER

RELAY

STARTER MOTOR

CLUTCH

START

SWITCH

EN(H4DOTC)(diag)-298

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

DH:DTC P062F INTERNAL CONTROL MODULE EEPROM ERROR

NOTE:

For the diagnostic procedure, refer to DTC P0606. <Ref. to EN(H4DOTC)(diag)-293, DTC P0606 CONTROL

MODULE PROCESSOR, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

Step

Check

Yes

No

1

CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?

Check the appropri-
ate DTC using the
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H4DOTC)(diag)
-87, List of Diagnos-
tic Trouble Code
(DTC).>

Go to step

2.

2

CHECK HARNESS BETWEEN ECM AND IG-
NITION SWITCH CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM connec-
tor and chassis ground.

Connector & terminal

(B136) No. 16 (+) — Chassis ground (–):

Is the voltage 10 V or more?

Repair the short
circuit to power
supply in harness
between ECM con-
nector and ignition
switch connector.

Repair the poor
contact of ECM
connector.

EN(H4DOTC)(diag)-299

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

DI: DTC P0851 NEUTRAL SWITCH INPUT CIRCUIT LOW (MT MODEL)

DTC DETECTING CONDITION:

• Detected when 2 consecutive driving cycles with fault occur.

• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-203, DTC P0851 NEUTRAL SWITCH INPUT CIRCUIT

LOW (MT MODEL), 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.>

EN-08739

35

B128

B128

T9

*

3

B136

B122

4

T12

B122

*

3

*

2

*

1

5M

6M

*

1

*

1

T12

1

2

B136

*

2

B128

3 4

1 2

6M

5M

2

6

5

4

3

1

2

1

35

31

30

32

29

34

33

21

20

19

18

17

16

28

27

26

15

14

13

12

11

25

23

22

24

10

3

4

9

1

2

8

7

6

5

8

7

6

5

4

3

2

1

:

:

ECM

: 5MT MODEL

: 6MT MODEL

: TERMINAL No.

OPTIONAL ARRANGEMENT

: 5MT MODEL : 1

6MT MODEL : 2

: 5MT MODEL : 3

6MT MODEL : 5

NEUTRAL

POSITION

SWITCH