Subaru Legacy IV (2008 year). Service manual — part 560
EN(H6DO)(diag)-213
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
13
CHECK CAUSE OF MISFIRE.
Was the cause of misfire identi-
fied when the engine is run-
ning?
Finish diagnostics
operation, if the
engine has no
abnormality.
Repair the poor
contact of connec-
tor.
NOTE:
In this case, repair
the following item:
• Poor contact of
ignition coil con-
nector
• Poor contact in
fuel injector con-
nector on faulty
cylinders
• Poor contact in
ECM connector
• Poor contact of
coupling connector
14
CHECK AIR INTAKE SYSTEM.
Is there any fault in air intake
system?
Repair the air
intake system.
NOTE:
Check the follow-
ing items.
• Are there air
leaks or air suction
caused by loose or
dislocated nuts
and bolts?
• Are there cracks
or any disconnec-
tion of hoses?
Go to step 15.
15
CHECK MISFIRE SYMPTOM.
1) Turn the ignition switch to ON.
2) Read the DTC.
NOTE:
• SUBARU SELECT MONITOR
For detailed operation procedure, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H6DO)(diag)-34, Subaru Select Moni-
tor.>
• General Scan Tool
For detailed operation procedures, refer to the
general scan tool operation manual.
Does the Subaru Select Moni-
tor or general scan tool indicate
only one DTC?
Go to step 21.
Go to step 16.
16
CHECK FOR ANY OTHER DTC ON DISPLAY. Are DTCs P0301 and P0302
displayed?
Go to step 22.
Go to step 17.
17
CHECK DTC ON DISPLAY.
Are DTCs P0303 and P0304
displayed?
Go to step 23.
Go to step 18.
18
CHECK DTC ON DISPLAY.
Are DTC P0305 and P0306 dis-
played?
Go to step 24.
Go to step 19.
19
CHECK DTC ON DISPLAY.
Are DTC P0301, P0303 and
P0305 displayed?
Go to step 25.
Go to step 20.
20
CHECK DTC ON DISPLAY.
Are DTC P0302, P0304 and
P0306 displayed?
Go to step 26.
Go to step 27.
Step
Check
Yes
No
EN(H6DO)(diag)-214
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
21
ONLY ONE CYLINDER.
Is there any fault in the cylin-
der?
Repair or replace
faulty parts.
NOTE:
Check the follow-
ing items.
• Spark plug
• Fuel injector
• Compression ra-
tio
Check DTC
P0171, P0172,
P0174 or P0175
using “List of Diag-
nostic Trouble
Code (DTC)”.
<Ref. to
EN(H6DO)(diag)-
81, List of Diagnos-
tic 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:
• Check the fol-
lowing items.
• Spark plug
• Fuel injector
• Ignition coil
• Compression
ratio
• If any fault is not
found, check the
“IGNITION CON-
TROL SYSTEM” of
#1 and #2 cylin-
ders side. <Ref. to
EN(H6DO)(diag)-
73, IGNITION
CONTROL SYS-
TEM, Diagnostics
for Engine Starting
Failure.>
Check DTC
P0171, P0172,
P0174 or P0175
using “List of Diag-
nostic Trouble
Code (DTC)”.
<Ref. to
EN(H6DO)(diag)-
81, List of Diagnos-
tic 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:
• Check the fol-
lowing items.
• Spark plug
• Fuel injector
• Ignition coil
• Compression
ratio
• If any fault is not
found, check the
“IGNITION CON-
TROL SYSTEM” of
#3 and #4 cylin-
ders side. <Ref. to
EN(H6DO)(diag)-
73, IGNITION
CONTROL SYS-
TEM, Diagnostics
for Engine Starting
Failure.>
Check DTC
P0171, P0172,
P0174 or P0175
using “List of Diag-
nostic Trouble
Code (DTC)”.
<Ref. to
EN(H6DO)(diag)-
81, List of Diagnos-
tic Trouble Code
(DTC).>
Step
Check
Yes
No
EN(H6DO)(diag)-215
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
24
GROUP OF #5 AND #6 CYLINDERS.
Are there any faults in #5 and
#6 cylinders?
Repair or replace
faulty parts.
NOTE:
• Check the fol-
lowing items.
• Spark plug
• Fuel injector
• Ignition coil
• Compression
ratio
• If any fault is not
found, check the
“IGNITION CON-
TROL SYSTEM” of
#5 and #6 cylin-
ders side. <Ref. to
EN(H6DO)(diag)-
73, IGNITION
CONTROL SYS-
TEM, Diagnostics
for Engine Starting
Failure.>
Check DTC
P0171, P0172,
P0174 or P0175
using “List of Diag-
nostic Trouble
Code (DTC)”.
<Ref. to
EN(H6DO)(diag)-
81, List of Diagnos-
tic Trouble Code
(DTC).>
25
GROUP OF #1, #3 AND #5 CYLINDERS.
Is there any fault in #1, #3 and
#5 cylinders?
Repair or replace
faulty parts.
NOTE:
Check the follow-
ing items.
• Spark plug
• Fuel injector
• Compression ra-
tio
• Skipping timing
chain teeth
Check DTC
P0171, P0172,
P0174 or P0175
using “List of Diag-
nostic Trouble
Code (DTC)”.
<Ref. to
EN(H6DO)(diag)-
81, List of Diagnos-
tic Trouble Code
(DTC).>
26
GROUP OF #2, #4 AND #6 CYLINDERS.
Is there any fault in #2, #4 and
#6 cylinders?
Repair or replace
faulty parts.
NOTE:
Check the follow-
ing items.
• Spark plug
• Fuel injector
• Compression ra-
tio
• Skipping timing
chain teeth
Check DTC
P0171, P0172,
P0174 or P0175
using “List of Diag-
nostic Trouble
Code (DTC)”.
<Ref. to
EN(H6DO)(diag)-
81, List of Diagnos-
tic Trouble Code
(DTC).>
27
CYLINDER AT RANDOM.
Is the engine idle rough?
Check DTC
P0171, P0172,
P0174 or P0175
using “List of Diag-
nostic Trouble
Code (DTC)”.
<Ref. to
EN(H6DO)(diag)-
81, List of Diagnos-
tic Trouble Code
(DTC).>
Repair or replace
faulty parts.
NOTE:
Check the follow-
ing items.
• Spark plug
• Fuel injector
• Compression ra-
tio
Step
Check
Yes
No
EN(H6DO)(diag)-216
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
BT:DTC P0327 KNOCK SENSOR 1 CIRCUIT LOW (BANK 1 OR SINGLE SENSOR)
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H6DO)-94, 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 repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H6DO)(diag)-52,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H6DO)(diag)-44, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:
EN-06875
B21
1 2 3 4 5 6 7 8 9 10 11
12 13 14 15 16 17 18 19 20 21 22
23 24 25 26 27 28 29 30 31 32 33
34
35
42
43
36
37
38
39
48
49
50
51
52
53
54
40
41
44
45
46
47
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
1 2
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
E
2
1
E14
2
1
E48
13
B20
E1
B21
E2
14
15
25
ECM
B134
16
29
E14
E48
B134
B20
19
KNOCK
SENSOR
2 (LH)
KNOCK
SENSOR
1 (RH)
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