Subaru Legacy IV (2008 year). Service manual — part 347
EN(H4DOTC)(diag)-209
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
WIRING DIAGRAM:
EN-05678
B47
1
2
4
6
3
5
SBF-7
E
F9
13
12
11
14
1
2
2
1
3
4
16
15
5
6
B143
F37
B144
B21
E2
E41
E40
B134
A:
B136
C:
F37
F11
B21
E40
B47
B144
F9
B143
F37
E41
1 2 3 4
12 13 14 15
5 6 7 8
16 17 18 19
9 10 11
20 21 22
23 24 25 26 27 28 29 30 31 32 33
35
34
37
36
39
38
41
40
43
42
44
45
47
46
49
48
51
50
53
52
54
MAIN
SBF
10A
60A
9
10
8
7
E
E
11
5
20
8
C30
C19
C8
A19
A27
A29
6
1
28
47
3
2
1
6
4
1
2
9
2
16
18
14
12
10
4
14
4
F11
1 2
3
4
1
2
5
6
1
3
4 5 6
2
B134
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
16
10 11 12 13 14 15
25
24
30
9
8
7
17 18 19 20
28
21 22 23
29
32
31
1
2
3
4
5
6
27
26
33 34 35
B136
1
5
7
6
2
8
3
4
9
1 2 3 4
5 6 7 8 9
10 11 12 13 14
15 16 17 18 19 20
1 2 3 4
5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20
5
6
3
1
2
9
10
12
11
13
14
4
7 8
15
16
46
MAIN RELAY
BATTERY
RELAY HOLDER
SECONDARY
AIR
COMBINATION
VALVE RELAY1
SECONDARY
AIR
COMBINATION
VALVE RELAY2
SECONDARY
AIR PUMP
RELAY
SECONDARY
AIR PUMP
MAIN FUSE
BOX (M/B)
ECM
SECONDARY AIR
COMBINATION VALVE RH
(WITH BUILT-IN PRESSURE SENSOR)
SECONDARY AIR
COMBINATION
VALVE LH
EN(H4DOTC)(diag)-210
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK HARNESS BETWEEN ECM AND
SECONDARY AIR PUMP RELAY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the ECM
and secondary air pump relay.
3) Measure the resistance of the harness
between the ECM and secondary air pump
relay.
Connector & terminal
(B136) No. 8 — (F9) No. 13:
Is the resistance less than 1
:? Go to step 2.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ECM and second-
ary air pump relay
• Poor contact of
coupling connector
2
CHECK HARNESS BETWEEN ECM AND
SECONDARY AIR PUMP RELAY.
Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B136) No. 8 — Chassis ground:
Is the resistance 1 M
: or
more?
Even if DTC is
detected, the cir-
cuit has returned to
a normal condition
at this time. Repro-
duce the failure,
and then perform
the diagnosis
again.
NOTE:
In this case, tem-
porary poor con-
tact of connector
may be the cause.
Repair ground
short circuit of the
harness between
the ECM and sec-
ondary air pump
relay.
EN(H4DOTC)(diag)-211
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
BJ:DTC P0420 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK 1)
DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-105, DTC P0420 CATALYST SYSTEM EFFICIENCY
BELOW THRESHOLD (BANK 1), Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
• Engine stalls.
• Idle mixture is out of specifications.
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-
52, OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-43, PRO-
CEDURE, Inspection Mode.>.
WIRING DIAGRAM:
EN-05670
B83
1 2 3 4
5 6 7 8
B138
B47
1
2
4
6
3
5
E
*
*
B138
B83
3
4
1
2
5
6
B135
B47
B19
B136
B:
C:
B137
D:
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
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
29 30 31
32 33
34 35
5
6
7
8
2
1
9
4
3
10
22 23
11 12 13 14 15
24 25
26
16 17
18 19 20 21
27
28 29
30 31
B19
T5
2
2
T5
B19
3
1
4
B21
1 2 3 4
12 13 14 15
5 6 7 8
16 17 18 19
9 10 11
20 21 22
23 24 25 26 27 28 29 30 31 32 33
35
34
37
36
39
38
41
40
43
42
44
45
47
46
49
48
51
50
53
52
54
T6
SBF-5
*
1
*
2
1
1
*
*
2
2
C4
B4
B30
B1
B134
T6
B134
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
A:
B135
B:
B136
C:
B137
D:
A:
D2
A5
D3
E2
B21
E
35
34
40
D7
36
D1
37
1 2
3 4
3
1
4
MAIN RELAY
REAR
OXYGEN SENSOR
BATTERY
ECM
: TERMINAL No. OPTIONAL
ARRANGEMENT
: TERMINAL No. OPTIONAL
ARRANGEMENT
AMONG 1, 2, 5 AND 6
EN(H4DOTC)(diag)-212
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK EXHAUST SYSTEM.
Check for gas leaks or air suction caused by
loose or dislocated nuts and bolts, and open
hole at exhaust pipes.
NOTE:
Check the following positions.
• Between cylinder head and front exhaust
pipe
• Between front exhaust pipe and front catalytic
converter
• Between front catalytic converter and rear
catalytic converter
• Looseness and improper attachment of front
oxygen (A/F) sensor or rear oxygen sensor
Is there any fault in exhaust
system?
Repair or replace
the exhaust sys-
tem. <Ref. to
EX(H4DOTC)-2,
General Descrip-
tion.>
Go to step 2.
2
CHECK WAVEFORM DATA ON THE SUBA-
RU SELECT MONITOR (WHILE DRIVING).
1) Drive at a constant speed between 80 —
112 km/h (50 — 70 MPH).
2) After 5 minutes have elapsed in the condi-
tion of step 1), use the Subaru Select Monitor
while still driving to read the waveform data.
• At normal condition
• At abnormal condition (numerous inversion)
Is normal waveform pattern dis-
played?
Even if DTC is
detected, the cir-
cuit has returned to
a normal condition
at this time. Repro-
duce the failure,
and then perform
the diagnosis
again.
NOTE:
In this case, tem-
porary poor con-
tact of connector
may be the cause.
Go to step 3.
EN-06666
1
0
1.5
0.5
10 sec/div
REAR OXYGEN
SENSOR VOLTAGE
(V)
A/F SENSOR
OUTPUT LAMBDA 1
EN-06667
1
0
1.5
0.5
10 sec/div
REAR OXYGEN
SENSOR VOLTAGE
(V)
A/F SENSOR
OUTPUT LAMBDA 1
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