Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 245
EN(H4DOTC)(diag)-204
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
BJ:DTC P0327 KNOCK SENSOR 1 CIRCUIT LOW (BANK 1 OR SINGLE SEN-
SOR)
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-124, DTC P0327 KNOCK SENSOR 1 CIRCUIT LOW
(BANK 1 OR SINGLE SENSOR), Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
• Poor driving performance
• Knocking occurs
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-
WIRING DIAGRAM:
• Engine electrical system, without SI-DRIVE <Ref. to WI-32, WITHOUT SI-DRIVE, WIRING DIAGRAM,
• Engine electrical system, with SI-DRIVE <Ref. to WI-48, WITH SI-DRIVE, WIRING DIAGRAM, Engine
ECM
EN-08730
D2
D
8
A29
B21
B137
D:
A:
31
30
29
28
27
21
20
19
18
17
16
26
25
24
15
14
13
12
11
23
22
10
3
4
9
1
2
8
7
6
5
2
1
E14
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
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
B134
E14
E2
B21
B137
B134
D:
A:
6
4
2
1
E
KNOCK SENSOR
EN(H4DOTC)(diag)-205
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK HARNESS BETWEEN ECM AND
KNOCK SENSOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance between ECM con-
nectors.
Connector & terminal
(B137) No. 2 — (B134) No. 29:
Is the resistance less than 500
kΩ?
2
CHECK KNOCK SENSOR.
1) Disconnect the connector from the knock
sensor.
2) Measure the resistance between knock
sensor connectors.
Terminals
No. 1 — No. 2:
Is the resistance less than 500
kΩ?
Repair the short
circuit to ground in
harness between
ECM connector
and knock sensor
connector.
NOTE:
The harness be-
tween both con-
nectors
are
shielded. Remove
the shield and re-
pair the short cir-
cuit of harness.
3
CHECK INPUT SIGNAL OF ECM.
1) Connect the connector to ECM.
2) Turn the ignition switch to ON.
3) Measure the voltage between ECM connec-
tor and chassis ground.
Connector & terminal
(B137) No. 2 (+) — Chassis ground (–):
Is the voltage 2 V or more?
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 short
circuit to ground in
harness between
ECM connector
and knock sensor
connector.
NOTE:
The harness be-
tween both con-
nectors
are
shielded. Remove
the shield and re-
pair the short cir-
cuit of harness.
EN(H4DOTC)(diag)-206
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
BK:DTC P0328 KNOCK SENSOR 1 CIRCUIT HIGH (BANK 1 OR SINGLE SEN-
SOR)
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-126, DTC P0328 KNOCK SENSOR 1 CIRCUIT HIGH
(BANK 1 OR SINGLE SENSOR), Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
• Poor driving performance
• Knocking occurs
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-
WIRING DIAGRAM:
• Engine electrical system, without SI-DRIVE <Ref. to WI-32, WITHOUT SI-DRIVE, WIRING DIAGRAM,
• Engine electrical system, with SI-DRIVE <Ref. to WI-48, WITH SI-DRIVE, WIRING DIAGRAM, Engine
ECM
EN-08730
D2
D
8
A29
B21
B137
D:
A:
31
30
29
28
27
21
20
19
18
17
16
26
25
24
15
14
13
12
11
23
22
10
3
4
9
1
2
8
7
6
5
2
1
E14
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
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
B134
E14
E2
B21
B137
B134
D:
A:
6
4
2
1
E
KNOCK SENSOR
EN(H4DOTC)(diag)-207
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK HARNESS BETWEEN ECM AND
KNOCK SENSOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance between ECM con-
nectors.
Connector & terminal
(B137) No. 2 — (B134) No. 29:
Is the resistance 600 kΩ or
more?
Repair the poor
contact of ECM
connector.
2
CHECK KNOCK SENSOR.
1) Disconnect the connector from the knock
sensor.
2) Measure the resistance between knock
sensor terminals.
Terminals
No. 1 — No. 2:
Is the resistance 600 kΩ or
more?
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ECM
connector
and knock sensor
connector
• Poor contact of
knock sensor con-
nector
• Poor contact of
coupling connector
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