Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 309
EN(H4DOTC)(diag)-460
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
FO:DTC P2444 SECONDARY AIR INJECTION SYSTEM PUMP STUCK ON
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-288, DTC P2444 SECONDARY AIR INJECTION SYS-
TEM PUMP STUCK ON, 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)-461
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
EN(H4DOTC)(diag)-462
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
• Models with SI-DRIVE <Ref. to WI-48, WITH SI-DRIVE, WIRING DIAGRAM, Engine Electrical System.>
EN-08735
F9
13
12
11
14
1
2
2
1
3
4
16
15
5
6
B143
F37
B144
B21
E2
E40
E41
B134
A:
A:
B135
B:
B135
B:
B137
D:
F37
F11
F9
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
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
F11
1 2
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
B143
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
F37
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
B144
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
E40
2
6
5
4
3
1
E41
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 SBF
MAIN RELAY
SECONDARY
AIR COMBINATION
VALVE RELAY 2
SECONDARY
AIR PUMP
RELAY
SECONDARY
AIR COMBINATION
VALVE RH
SECONDARY
AIR COMBINATION
VALVE LH
(WITH BUILT-IN
PRESSURE SENSOR)
SECONDARY
AIR COMBINATION
VALVE RELAY 1
SECONDARY
AIR PUMP
MAIN FUSE BOX
(M/B)
RELAY HOLDER
BATTERY
EN(H4DOTC)(diag)-463
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK SECONDARY AIR PIPING PRES-
SURE.
1) Turn the ignition switch to ON.
2) Using the Subaru Select Monitor, read the
value of «Sec. Air Piping Pressure», and com-
pare with the actual atmospheric pressure.
NOTE:
Is the difference between «Sec.
Air Piping Pressure» and atmo-
spheric pressure 50 mmHg (6.7
kPa, 2.0 inHg, 0.97 psig) or
less?
2
CHECK HARNESS BETWEEN ECM AND
SECONDARY AIR PUMP RELAY CONNEC-
TOR.
1) Turn the ignition switch to OFF.
2) Remove the secondary air pump relay from
the relay holder.
3) Measure the resistance between the sec-
ondary air pump relay connector and engine
ground terminals.
Connector & terminal
(F9) No. 13 — Engine ground:
Is the resistance 1 MΩ or
more?
3
CHECK SECONDARY AIR PUMP FUSE.
1) Disconnect the secondary air pump connec-
tor.
2) Install the secondary air pump relay to the
relay holder.
3) Check the MAIN SBF and the secondary air
pump fuse (60 A) for blown out.
Is the fuse blown out?
Replace the fuse
with a new part,
and go to the next
step. Go to step
4
CHECK SECONDARY AIR PUMP POWER
SUPPLY.
1) Disconnect the positive (+) terminal after
disconnecting the negative (–) terminal of bat-
tery.
2) Measure the resistance between secondary
air pump connector and battery cable positive
terminal.
Connector & terminal
(F11) No. 2 — battery cable positive ter-
minal:
Is the resistance 1 MΩ or
more?
5
CHECK SECONDARY AIR PUMP RELAY.
1) Remove the secondary air pump relay from
the relay holder.
2) Measure the resistance between the sec-
ondary air pump relay terminals.
Terminals
No. 11 — No. 14:
Is the resistance 1 MΩ or
more?
Repair the short
circuit to power of
the secondary air
pump, and go to
the next step. Go
to step
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