Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 250
EN(H4DOTC)(diag)-224
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK POWER SUPPLY OF CAMSHAFT
POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from camshaft
position sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between camshaft
position sensor connector and engine ground.
Connector & terminal
(E65) No. 1 (+) — Engine ground (–):
Is the voltage 10 V or more?
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit or
short circuit to
ground in harness
between main re-
lay connector and
camshaft position
sensor connector
• Poor contact of
coupling connector
2
CHECK HARNESS BETWEEN ECM AND
CAMSHAFT POSITION SENSOR CONNEC-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance between ECM con-
nector and camshaft position sensor connector.
Connector & terminal
(B137) No. 29 — (E65) No. 2:
(B137) No. 30 — (E65) No. 3:
Is the resistance less than 1 Ω? Go to step
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ECM
connector
and camshaft posi-
tion sensor con-
nector
• Poor contact of
coupling connector
3
CHECK HARNESS BETWEEN ECM AND
CAMSHAFT POSITION SENSOR CONNEC-
TOR.
Measure the resistance between camshaft
position sensor connector and engine ground.
Connector & terminal
(E65) No. 2 — Engine ground:
Is the resistance 1 MΩ or
more?
Repair short circuit
to ground in har-
ness between
ECM connector
and camshaft posi-
tion sensor con-
nector.
4
CHECK HARNESS BETWEEN ECM AND
CAMSHAFT POSITION SENSOR CONNEC-
TOR.
Measure the voltage between camshaft posi-
tion sensor connector and engine ground.
Connector & terminal
(E65) No. 2 (+) — Engine ground (–):
Is the voltage 5 V or more?
Repair the short
circuit to power in
the harness
between ECM con-
nector and cam-
shaft position
sensor connector.
5
CHECK CONDITION OF CAMSHAFT POSI-
TION SENSOR.
Is the camshaft position sensor
installation bolt tightened
securely?
6
CHECK CAMSHAFT POSITION SENSOR.
Check the waveform of the camshaft position
sensor. <Ref. to EN(H4DOTC)(diag)-23,
Engine Control Module (ECM) I/O Signal.>
Is there any abnormality in
waveform?
Replace the cam-
shaft position sen-
sor. <Ref. to
FU(STI)-37, Cam-
shaft Position Sen-
sor.>
Repair the follow-
ing item.
• Poor contact of
ECM connector
• Poor contact of
camshaft position
sensor connector
• Poor contact of
coupling connector
EN(H4DOTC)(diag)-225
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
BY:DTC P0391 CAMSHAFT POSITION SENSOR B CIRCUIT RANGE/PERFOR-
MANCE (BANK 2)
NOTE:
For the diagnostic procedure, refer to DTC P0390. <Ref. to EN(H4DOTC)(diag)-223, DTC P0390 CAM-
SHAFT POSITION SENSOR “B” CIRCUIT (BANK 2), Diagnostic Procedure with Diagnostic Trouble Code
EN(H4DOTC)(diag)-226
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
BZ:DTC P0410 SECONDARY AIR INJECTION SYSTEM
DTC DETECTING CONDITION:
• Detected when 2 consecutive driving cycles with fault occur.
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-139, DTC P0410 SECONDARY AIR INJECTION SYS-
TEM, 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)-227
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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