Subaru Legacy (2005 year). Service manual — part 137
EN(H4SO 2.0)(diag)-137
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
22
GROUP OF #1 AND #2 CYLINDERS
Are there any faults in #1 and
#2 cylinders?
Repair or replace
faulty parts.
NOTE:
(1) Check the fol-
lowing items.
• Spark plug
• Fuel injector
• Ignition coil
• Compres-
sion ratio
(2) If no abnormal
is discovered,
check for “IGNI-
TION CONTROL
SYSTEM” of #1
and #2 cylinders
side. <Ref. to
EN(H4SO
2.0)(diag)-56,
IGNITION CON-
TROL SYSTEM,
Diagnostics for
Engine Starting
Failure.>
Go to DTC P0171.
<Ref. to EN(H4SO
2.0)(diag)-123,
DTC P0171 SYS-
TEM TOO LEAN
(BANK 1), Diag-
nostic Procedure
with Diagnostic
Trouble Code
(DTC).>
23
GROUP OF #3 AND #4 CYLINDERS
Are there any faults in #3 and
#4 cylinders?
Repair or replace
faulty parts.
NOTE:
(1) Check the fol-
lowing items.
• Spark plug
• Fuel injector
• Ignition coil
(2) If no abnormal
is discovered,
check for “16. D:
IGNITION CON-
TROL SYSTEM”
of #3 and #4 cylin-
ders side. <Ref. to
EN(H4SO
2.0)(diag)-56,
IGNITION CON-
TROL SYSTEM,
Diagnostics for
Engine Starting
Failure.>
Go to DTC P0171.
<Ref. to EN(H4SO
2.0)(diag)-123,
DTC P0171 SYS-
TEM TOO LEAN
(BANK 1), Diag-
nostic Procedure
with Diagnostic
Trouble Code
(DTC).>
24
GROUP OF #1 AND #3 CYLINDERS
Are there any faults in #1 and
#3 cylinders?
Repair or replace
faulty parts.
NOTE:
Check the follow-
ing items.
• Spark plug
• Fuel injector
• Skipping timing
belt teeth
Go to DTC P0171.
<Ref. to EN(H4SO
2.0)(diag)-123,
DTC P0171 SYS-
TEM TOO LEAN
(BANK 1), Diag-
nostic Procedure
with Diagnostic
Trouble Code
(DTC).>
Step
Check
Yes
No
EN(H4SO 2.0)(diag)-138
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
25
GROUP OF #2 AND #4 CYLINDERS
Are there any faults in #2 and
#4 cylinders?
Repair or replace
faulty parts.
NOTE:
Check the follow-
ing items.
• Spark plug
• Fuel injector
• Compression
ratio
• Skipping timing
belt teeth
Go to DTC P0171.
<Ref. to EN(H4SO
2.0)(diag)-123,
DTC P0171 SYS-
TEM TOO LEAN
(BANK 1), Diag-
nostic Procedure
with Diagnostic
Trouble Code
(DTC).>
26
CYLINDER AT RANDOM
Is the engine idle rough?
Go to DTC P0171.
<Ref. to EN(H4SO
2.0)(diag)-123,
DTC P0171 SYS-
TEM TOO LEAN
(BANK 1), Diag-
nostic Procedure
with Diagnostic
Trouble Code
(DTC).>
Repair or replace
faulty parts.
NOTE:
Check the follow-
ing items.
• Spark plug
• Fuel injector
• Compression
ratio
Step
Check
Yes
No
EN(H4SO 2.0)(diag)-139
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AE:DTC P0327 KNOCK SENSOR 1 CIRCUIT LOW (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)-140
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
Check
Yes
No
1
CHECK HARNESS BETWEEN KNOCK SEN-
SOR AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance between ECM har-
ness connector and chassis ground.
Connector & terminal
(B136) No. 23 — Chassis ground:
Is the resistance more than
700 k
Ω?
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following item:
• Open circuit of
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 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 more than
700 k
Ω?
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following item:
• Poor contact in
knock sensor con-
nector
3
CHECK INSTALLATION CONDITION OF
KNOCK SENSOR.
Is the knock sensor installation
bolt tightened securely?
Replace the knock
sensor. <Ref. to
FU(H4SO 2.0)-23,
Knock Sensor.>
Tighten the knock
sensor installation
bolt securely.
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