Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 238

EN(H4DOTC)(diag)-176

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

AV:DTC P0202 INJECTOR #2

NOTE:

For the diagnostic procedure, refer to DTC P0201. <Ref. to EN(H4DOTC)(diag)-174, DTC P0201 INJECTOR

#1, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

AW:DTC P0203 INJECTOR #3

NOTE:

For the diagnostic procedure, refer to DTC P0201. <Ref. to EN(H4DOTC)(diag)-174, DTC P0201 INJECTOR

#1, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

AX:DTC P0204 INJECTOR #4

NOTE:

For the diagnostic procedure, refer to DTC P0201. <Ref. to EN(H4DOTC)(diag)-174, DTC P0201 INJECTOR

#1, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

6

CHECK FUEL INJECTOR OPERATION.
1) Connect all connectors.
2) Start the engine.
3) Check if the corresponding fuel injector
emits operating sound.
NOTE:

Use a sound scope to check the operating
sound.

Does the fuel injector emit
operating sound?

Even if DTC is
detected, the cir-
cuit has returned to
a normal condition
at this time. Repro-
duce the failure,
and then perform
the diagnosis
again.
NOTE:

In this case, tem-
porary poor con-
tact of connector,
temporary open or
short circuit of har-
ness may be the
cause.

Repair the poor
contact of fuel
injector connector.

Step

Check

Yes

No

EN(H4DOTC)(diag)-177

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

AY:DTC P0222 THROTTLE/PEDAL POSITION SENSOR/SWITCH “B” CIRCUIT

LOW

DTC DETECTING CONDITION:

• Immediately at fault recognition

• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-102, DTC P0222 THROTTLE/PEDAL POSITION

SENSOR/SWITCH “B” CIRCUIT LOW, Diagnostic Trouble Code (DTC) Detecting Criteria.>

TROUBLE SYMPTOM:

• Improper idling

• Poor driving performance

• Engine stalls.
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.>.

EN(H4DOTC)(diag)-178

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

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.>

Step

Check

Yes

No

1

CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL CON-
NECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
electronic throttle control.
3) Measure the resistance between ECM con-
nector and chassis ground.

Connector & terminal

(B134) No. 19 — Chassis ground:
(B134) No. 28 — Chassis ground:

Is the resistance 1 MΩ or
more?

Go to step

2.

Repair the ground
short circuit of har-
ness between
ECM connector
and electronic
throttle control
connector.

ECM

EN-08727

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

B136

C:

B134

A:

36

35

34

40

B17

B7

D3

A29

6

E2

B21

A1

8

C4

A2

8

6

4

25

*

*

B122

24

3

8

39

2

8

A2

A1

A19

A6

A3

D1

A4

3

E57

2

1

5

B134

B220

B220

31

29

32

A:

B137

B136

D:

C:

B135

B:

*

30

21

22

15A

B220

3

4

B135

B:

35

34

33

32

31

30

29

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

B220

18

19

6

7

4

3
5

2

1

12

11

10

9

8

40

36 39

38

37

34

33

35

32

28 31

30

29

23

22

21

20

26

25

24

27

17

16

15

14

13

B122

8

7

6

5

4

3

2

1

B21

33

32

31

30

29

28

27

26

47

46

45

44

43

42

54

53

52

51

50

49

48

41

40

39

38

37

36

35

34

25

24

23

22

21

20

19

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

D: B137

26

25

24

23

22

18

28

27

17

16

15

14

13

31

30

29

21

20

19

12

11

10

4

3

6

5

9

8

7

2

1

E57

6

5

4

3

2

1

35

34

33

32

7

26

25

24

23

22

18

28

27

17

16

15

14

13

31

30

29

21

20

19

12

11

10

4

3

6

5

9

8

2

1

E

E

E

SBF-7

FUSE

(RELAY BLOCK)

MAIN RELAY

ELECTRONIC THROTTLE

CONTROL RELAY

BATTERY

: TERMINAL No. OPTIONAL ARRANGEMENT

ELECTRONIC THROTTLE

CONTROL

EN(H4DOTC)(diag)-179

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

2

CHECK SHORT CIRCUIT INSIDE THE ECM.
1) Connect the connector to ECM.
2) Measure the resistance between electronic
throttle control connector and engine ground.

Connector & terminal

(E57) No. 4 — Engine ground:

Is the resistance 1 MΩ or
more?

Replace the elec-
tronic throttle con-
trol. <Ref. to
FU(STI)-15, Throt-
tle Body.> <Ref. to
FU(w/o STI)-15,
Throttle Body.>

Repair the ground
short circuit of har-
ness between
ECM connector
and electronic
throttle control
connector.
Replace the ECM if
defective. <Ref. to
FU(STI)-59,
Engine Control
Module (ECM).>
<Ref. to FU(w/o
STI)-57, Engine
Control Module
(ECM).>

Step

Check

Yes

No