Subaru Legacy III (2000-2003 year). Service manual — part 141
EN(H4SO)-176
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AG:DTC P0327 — KNOCK SENSOR 1 CIRCUIT LOW INPUT (BANK 1 OR SIN-
GLE SENSOR) —
• DTC DETECTING CONDITION:
• Immediately at fault recognition
• TROUBLE SYMPTOM:
• Poor driving performance
• Knocking occurs.
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode<Ref. to EN(H4SO)-47, OPER-
ATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-40, OPERATION, Inspection
Mode.> .
• WIRING DIAGRAM:
EN-00728
16
27
KNOCK
SENSOR
16
2
ECM
B135
B21
E2
E14
B21
E14
1 2
1 2
5
6 7
8
13
14 15
16
9 10
11 12
3 4
17 18
19 20
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
B135
EN(H4SO)-177
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK HARNESS BETWEEN KNOCK SEN-
SOR AND ECM CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance between ECM harness
connector and chassis ground.
Connector & terminal
(B135) No. 16 — Chassis ground:
Does the measured value exceed the spec-
ified value?
700 k
Ω
Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
knock sensor and
ECM connector
• Poor contact in
knock sensor con-
nector
• Poor contact in
coupling connector
2
CHECK KNOCK SENSOR.
1) Disconnect connector from knock sensor.
2) Measure resistance between knock sensor
connector terminal and engine ground.
Terminal
No. 2 — Engine ground:
Does the measured value exceed the spec-
ified value?
700 k
Ω
Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
knock sensor and
ECM connector
• Poor contact in
knock sensor con-
nector
• Poor contact in
coupling connector
3
CHECK CONDITION OF KNOCK SENSOR
INSTALLATION.
Is the knock sensor installation bolt tightened
securely?
Tightened securely.
Replace knock
sensor. <Ref. to
FU(H4SO)-29,
Knock Sensor.>
Tighten knock
sensor installation
bolt securely.
EN(H4SO)-178
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AH:DTC P0328 — KNOCK SENSOR 1 CIRCUIT HIGH INPUT (BANK 1 OR SIN-
GLE SENSOR) —
• DTC DETECTING CONDITION:
• Immediately at fault recognition
• TROUBLE SYMPTOM:
• Poor driving performance
• Knocking occurs.
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode<Ref. to EN(H4SO)-47, OPER-
ATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-40, OPERATION, Inspection
Mode.> .
• WIRING DIAGRAM:
EN-00728
16
27
KNOCK
SENSOR
16
2
ECM
B135
B21
E2
E14
B21
E14
1 2
1 2
5
6 7
8
13
14 15
16
9 10
11 12
3 4
17 18
19 20
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
B135
EN(H4SO)-179
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK HARNESS BETWEEN KNOCK SEN-
SOR AND ECM CONNECTOR.
Measure resistance of harness between ECM
connector and chassis ground.
Connector & terminal
(B135) No. 16 — Chassis ground:
Is the measured value less than the specified
value?
400 k
Ω
2
CHECK KNOCK SENSOR.
1) Disconnect connector from knock sensor.
2) Measure resistance between knock sensor
connector terminal and engine ground.
Terminal
No. 2 — Engine ground:
Is the measured value less than the speci-
fied value?
400 k
Ω
Replace knock
sensor. <Ref. to
FU(H4SO)-29,
Knock Sensor.>
Repair ground
short circuit in har-
ness between
knock sensor con-
nector and ECM
connector.
NOTE:
The harness be-
tween both con-
nectors is
shielded. Repair
short circuit of har-
ness together with
shield.
3
CHECK INPUT SIGNAL FOR ECM.
1) Connect connectors to ECM and knock
sensor.
2) Turn ignition switch to ON.
3) Measure voltage between ECM and chas-
sis ground.
Connector & terminal
(B135) No. 16 (+) — Chassis ground (
−−−−
):
Does the measured value exceed the spec-
ified value?
2 V
Even if MI lights
up, the circuit has
returned to a nor-
mal condition at
this time. (How-
ever, the possibil-
ity of poor contact
still remains.)
NOTE:
In this case, repair
the following:
• Poor contact in
knock sensor con-
nector
• Poor contact in
ECM connector
• Poor contact in
coupling connector
Repair poor con-
tact in ECM con-
nector.
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