Subaru Legacy IV (2008 year). Service manual — part 320
EN(H4DOTC)(diag)-101
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
I:
DTC P0038 HO2S HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 2)
DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-22, DTC P0038 HO2S HEATER CONTROL CIRCUIT
HIGH (BANK 1 SENSOR 2), Diagnostic Trouble Code (DTC) Detecting Criteria.>
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)-102
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK HARNESS BETWEEN ECM AND
REAR OXYGEN SENSOR.
1) Turn the ignition switch to OFF.
2) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B136) No. 4 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Repair the short
circuit to power in
the harness
between ECM and
rear oxygen sensor
connector.
Go to step 2.
2
CHECK GROUND CIRCUIT FOR ECM.
1) Disconnect the connectors from ECM.
2) Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B134) No. 5 — Chassis ground:
(B137) No. 1 — Chassis ground:
(B137) No. 2 — Chassis ground:
(B137) No. 3 — Chassis ground:
(B137) No. 7 — Chassis ground:
Is the resistance less than 5
:? Repair the poor
contact of ECM
connector.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and engine
ground
• Poor contact of
coupling connector
EN(H4DOTC)(diag)-103
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
J: DTC P0068 MAP/MAF - THROTTLE POSITION CORRELATION
DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-24, DTC P0068 MAP/MAF - THROTTLE POSITION
CORRELATION, Diagnostic Trouble Code (DTC) Detecting Criteria.>
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-05671
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
23
28
6
B21
E2
2
3
1
E21
E21
B21
B134
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
B134
1 2 3
6
29
19
MANIFOLD
ABSOLUTE
PRESSURE
SENSOR
ECM
EN(H4DOTC)(diag)-104
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK AIR INTAKE SYSTEM.
Are there holes, loose bolts or
disconnection of hose on air
intake system?
Repair the air
intake system.
Go to step 2.
2
CHECK MANIFOLD ABSOLUTE PRESSURE
SENSOR.
1) Start the engine and warm up engine until
coolant temperature is higher than 75°C
(167°F).
2) For AT models, set the select lever to “P”
range or “N” range, and for MT models, place
the shift lever in the neutral position.
3) Turn the A/C switch to OFF.
4) Turn all the accessory switches to OFF.
5) Read the data of intake manifold pressure
sensor signal using Subaru Select Monitor or
general scan tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedure, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4DOTC)(diag)-34, Subaru Select Moni-
tor.>
• General scan tool
For detailed operation procedures, refer to the
“General Scan Tool Instruction Manual”.
Is the measured value 73.3 —
106.6 kPa (550 — 800 mmHg,
21.65 — 31.50 inHg) when the
ignition is turned ON, and 20.0 —
46.7 kPa (150 — 350 mmHg,
5.91 — 13.78 inHg) during
idling?
Go to step 3.
Replace the mani-
fold absolute pres-
sure sensor. <Ref.
to FU(H4DOTC)-
37, Manifold Abso-
lute Pressure Sen-
sor.>
3
CHECK THROTTLE OPENING ANGLE.
Read the data of throttle position signal using
Subaru Select Monitor or general scan tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedure, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4DOTC)(diag)-34, Subaru Select Moni-
tor.>
• General scan tool
For detailed operation procedures, refer to the
“General Scan Tool Instruction Manual”.
Is the measured value less than
5% when throttle is fully
closed?
Go to step 4.
Replace the elec-
tronic throttle con-
trol. <Ref. to
FU(H4DOTC)-14,
Throttle Body.>
4
CHECK THROTTLE OPENING ANGLE.
Is the measured value 85% or
more when throttle is fully
open?
Replace the mani-
fold absolute pres-
sure sensor. <Ref.
to FU(H4DOTC)-
37, Manifold Abso-
lute Pressure Sen-
sor.>
Replace the elec-
tronic throttle con-
trol. <Ref. to
FU(H4DOTC)-14,
Throttle Body.>
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