Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 297
EN(H4DOTC)(diag)-412
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
28
CHECK CRANK SPROCKET.
Remove the timing belt cover. <Ref. to ME(STI)-
49, REMOVAL, Timing Belt Cover.> <Ref. to
ME(w/o STI)-47, REMOVAL, Timing Belt
Cover.>
Is the crank sprocket rusted or
does it have broken teeth?
29
CHECK INSTALLATION CONDITION OF
TIMING BELT.
Turn the crankshaft using ST, and align the
alignment mark on crank sprocket with align-
ment mark on cylinder block.
ST 499987500
CRANKSHAFT
SOCKET
Is the timing belt dislocated
from its proper position?
30
CHECK FUEL LEVEL.
Is the fuel meter indication
higher than the “Lower” level?
31
CHECK STATUS OF MALFUNCTION INDI-
CATOR LIGHT.
1) Clear the memory using the Subaru Select
Monitor or general scan tool. <Ref. to
EN(H4DOTC)(diag)-63, Clear Memory Mode.>
2) Start the engine, and drive the vehicle 10
minutes or more.
Does the malfunction indicator
light illuminate or blink?
32
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 of
fuel injector con-
nector on faulty
cylinders
• Poor contact of
ECM connector
• Poor contact of
coupling connector
33
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?
Step
Check
Yes
No
EN(H4DOTC)(diag)-413
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
34
CHECK MISFIRE SYMPTOM.
1) Turn the ignition switch to ON.
2) Check for DTC. <Ref. to
EN(H4DOTC)(diag)-48, Read Diagnostic Trou-
ble Code (DTC).>
Does the Subaru Select Moni-
tor or general scan tool indicate
only one DTC?
35
CHECK DTC.
Is DTC P0301 and P0303 dis-
played on the Subaru Select
Monitor or general scan tool?
36
CHECK DTC.
Is DTC P0302 and P0304 dis-
played on the Subaru Select
Monitor or general scan tool?
37
ONLY ONE CYLINDER.
Is there any fault in the cylin-
der?
Repair or replace
faulty parts.
NOTE:
Check the follow-
ing items.
• Spark plug
• Ignition coil
• Fuel injector
• Compression ra-
tio
38
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
• Ignition coil
• Fuel injector
• Compression ra-
tio
• Skipping timing
belt teeth
39
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
• Ignition coil
• Fuel injector
• Compression ra-
tio
• Skipping timing
belt teeth
40
CYLINDER AT RANDOM.
Is the engine idle rough?
Repair or replace
faulty parts.
NOTE:
Check the follow-
ing items.
• Spark plug
• Ignition coil
• Fuel injector
• Compression ra-
tio
Step
Check
Yes
No
EN(H4DOTC)(diag)-414
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
FA:DTC P2257 AIR SYSTEM CONTROL "A" CIRCUIT LOW
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-274, DTC P2257 AIR SYSTEM CONTROL "A" CIR-
CUIT LOW, Diagnostic Trouble Code (DTC) Detecting Criteria.>
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-
EN(H4DOTC)(diag)-415
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
WIRING DIAGRAM:
• Models without SI-DRIVE <Ref. to WI-32, WITHOUT SI-DRIVE, WIRING DIAGRAM, Engine Electrical
EN-08734
F9
13
12
11
14
1
2
2
1
3
4
16
15
5
6
B143
F37
B144
B21
E2
E41
E40
B134
A:
A:
B135
B:
B135
B:
B137
D:
F37
F11
B144
F9
B143
F37
E41
10A
60A
9
10
8
7
11
5
20
8
B8
B20
B27
A19
D9
A29
6
1
2
8
47
3
2
1
6
4
1
2
9
2
16
18
14
12
10
4
14
4
E40
B134
46
B220
24
23
22
21
B137
D:
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
1 2
F11
29
4
3
1
2
7
6
5
10 11 12 13 14 15
25
24
16
30
9
8
17 18 19
20
28
21 22 23
32
31
26 27
33
34 35
B220
18
19
6
7
4
3
5
2
1
12
11
10
9
8
40
36 39
38
37
34
33
35
32
28 31
30
29
23
22
21
20
26
25
24
27
17
16
15
14
13
4
3
B220
15A
16
15
8
7
4
14
13
11
12
10
9
2
1
3
6
5
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
3
8
2
6
7
1
5
4
9
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
2
6
5
4
3
1
2
1
54
52 53
50 51
48 49
46 47
45
44
42 43
40 41
38 39
36 37
34 35
33
32
31
30
29
28
27
26
25
24
23
22
21
20
11
10
9
19
18
17
16
8
7
6
5
15
14
13
12
4
3
2
1
B21
E
E
E
ECM
SBF-7
FUSE
(RELAY BLOCK)
MAIN RELAY
SECONDARY
AIR COMBINATION
VALVE RELAY 2
MAIN SBF
SECONDARY
AIR PUMP
RELAY
SECONDARY
AIR COMBINATION
VALVE LH
SECONDARY
AIR COMBINATION
VALVE RH
(WITH BUILT-IN
PRESSURE SENSOR)
SECONDARY
AIR COMBINATION
VALVE RELAY 1
SECONDARY
AIR PUMP
MAIN FUSE BOX
(M/B)
RELAY HOLDER
BATTERY
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