Subaru Legacy (2005 year). Manual - part 138

EN(H4SO 2.0)(diag)-141

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AF:DTC P0328 KNOCK SENSOR 1 CIRCUIT HIGH (BANK 1 OR SINGLE SEN-

SOR)

DTC DETECTING CONDITION:
Immediately at fault recognition
TROUBLE SYMPTOM:
• Poor driving performance
• Knocking occurs.

CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO 2.0)(diag)-
38, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.0)(diag)-32, PRO-
CEDURE, Inspection Mode.>.
WIRING DIAGRAM:

EN-03480

23

12

KNOCK

SENSOR

13

2

ECM

B136

B20

E1

E14

E14

B20

E

B136

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

35

1 2

1 2 3 4
5 6 7 8
9 10 11 12

14

13

15 16

EN(H4SO 2.0)(diag)-142

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK HARNESS BETWEEN KNOCK SEN-
SOR AND ECM CONNECTOR.
Measure the resistance of harness between 
ECM connector and chassis ground.

Connector & terminal

(B136) No. 23 — Chassis ground:

Is the resistance less than 400 
k

Ω?

Go to step 2.

Go to step 3.

2

CHECK KNOCK SENSOR.
1) Disconnect the connector from knock sen-
sor.
2) Measure the resistance between knock 
sensor connector terminal and engine ground.

Terminals

No. 2 — Engine ground:

Is the resistance less than 400 
k

Ω?

Replace the knock 
sensor. <Ref. to 
FU(H4SO 2.0)-23, 
Knock Sensor.>

Repair the ground 
short circuit of har-
ness between 
knock sensor con-
nector and ECM 
connector.

NOTE:
The harness be-
tween both con-
nectors are
shielded. Repair
the short circuit of
harness covered
with shield.

3

CHECK INPUT SIGNAL OF ECM.
1) Connect the connectors to ECM and knock 
sensor.
2) Turn the ignition switch to ON.
3) Measure the voltage between ECM and 
chassis ground.

Connector & terminal

(B136) No. 23 (+) — Chassis ground (

−

):

Is the voltage more than 2 V?

Even if the mal-
function indicator 
light illuminates, 
the circuit has 
returned to a nor-
mal condition at 
this time. (How-
ever, the possibility 
of poor contact still 
remains.)

NOTE:
In this case, repair
the following item:
• Poor contact in 
knock sensor con-
nector
• Poor contact in 
ECM connector
• Poor contact in 
coupling connector

Repair the poor 
contact in ECM 
connector.

EN(H4SO 2.0)(diag)-143

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AG:DTC P0335 CRANKSHAFT POSITION SENSOR “A” CIRCUIT

DTC DETECTING CONDITION:
Immediately at fault recognition
TROUBLE SYMPTOM:
• Engine stalls.
• Failure of engine to start

CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO 2.0)(diag)-
38, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.0)(diag)-32, PRO-
CEDURE, Inspection Mode.>.
WIRING DIAGRAM:

EN-03481

1

2

8

7

24

32

B20

E1

E10

E10

1 2

B136

ECM

CRANKSHAFT

POSITION

SENSOR

E

B20

1 2 3 4
5 6 7 8

*

2

2

B136

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

35

B138

B122

B138 :LHD

B122 :RHD

*
*

1

: TERMINAL No. RANDOM ARRANGEMENT
  AMONG 3,4,7, AND 8

*

 : WITH IMMOBILIZER: 27
   WITHOUT IMMOBILIZER: 26

1

2

*

1 2 3 4
5 6 7 8
9 10 11 12

14

13

15 16

EN(H4SO 2.0)(diag)-144

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK HARNESS BETWEEN CRANK-
SHAFT POSITION SENSOR AND ECM CON-
NECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from crankshaft 
position sensor.
3) Measure the resistance of harness 
between crankshaft position sensor connector 
and engine ground.

Connector & terminal

(E10) No. 1 — Engine ground:

Is the resistance more than 
100 k

Ω?

Repair the har-
ness and connec-
tor.

NOTE:
In this case, repair
the following item:
• Open circuit of 
harness between 
crankshaft posi-
tion sensor and 
ECM connector
• Poor contact in 
ECM connector
• Poor contact in 
coupling connector

Go to step 2.

2

CHECK HARNESS BETWEEN CRANK-
SHAFT POSITION SENSOR AND ECM CON-
NECTOR.
Measure the resistance of harness between 
crankshaft position sensor connector and 
engine ground.

Connector & terminal

(E10) No. 1 — Engine ground:

Is the resistance less than 10 
Ω?

Repair the ground 
short circuit of har-
ness between 
crankshaft posi-
tion sensor and 
ECM connector.

NOTE:
The harness be-
tween both con-
nectors are
shielded. Repair
the ground short
circuit of harness
with shield.

Go to step 3.

3

CHECK HARNESS BETWEEN CRANK-
SHAFT POSITION SENSOR AND ECM CON-
NECTOR.
Measure the resistance of harness between 
crankshaft position sensor connector and 
engine ground.

Connector & terminal

(E10) No. 2 — Engine ground:

Is the resistance less than 5 
Ω?

Go to step 4.

Repair the har-
ness and connec-
tor.

NOTE:
In this case, repair
the following item:
• Open circuit of 
harness between 
crankshaft posi-
tion sensor and 
ECM connector
• Poor contact in 
ECM connector
• Poor contact in 
coupling connector

4

CHECK CONDITION OF CRANKSHAFT PO-
SITION SENSOR.

Is the crankshaft position sen-
sor installation bolt tightened 
securely?

Go to step 5.

Tighten the crank-
shaft position sen-
sor installation bolt 
securely.

5

CHECK CRANKSHAFT POSITION SENSOR.
1) Remove the crankshaft position sensor.
2) Measure the resistance between connector 
terminals of crankshaft position sensor.

Terminals

No. 1 — No. 2:

Is the resistance 1 — 4 k

Ω?

Repair the poor 
contact in crank-
shaft position sen-
sor connector.

Replace the crank-
shaft position sen-
sor. <Ref. to 
FU(H4SO 2.0)-21, 
Crankshaft Posi-
tion Sensor.>