Subaru Legacy (2005 year). Service manual — part 123
EN(H4SO 2.0)(diag)-81
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
F: DTC P0107 MANIFOLD ABSOLUTE PRESSURE/BAROMETRIC PRESSURE
CIRCUIT LOW INPUT
DTC DETECTING CONDITION:
Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO 2.0)(diag)-
38, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.0)(diag)-32, PRO-
CEDURE, Inspection Mode.>.
WIRING DIAGRAM:
EN-03477
18
20
17
MANIFOLD
ABSOLUTE
PRESSURE
SENSOR
19
20
7
B21
E2
1
3
2
E21
ECM
B21
B136
B83
1 2 3 4
5 6 7 8
B138
B83
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
B136
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
E21
1 2 3
:LHD
B138 :RHD
*
*
*
: TERMINAL No. RANDOM ARRANGEMENT
AMONG 1,2,5, AND 6
EN(H4SO 2.0)(diag)-82
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
Check
Yes
No
1
CHECK CURRENT DATA.
1) Start the engine.
2) Read the data of intake manifold absolute
pressure 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(H4SO 2.0)(diag)-25, Subaru Select
Monitor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
Is the value less than 13.3 kPa
(100 mmHg, 3.94 inHg)?
2
CHECK POOR CONTACT.
Check poor contact in ECM and manifold
absolute pressure sensor connector.
Is there poor contact in ECM or
manifold absolute pressure
sensor connector?
Repair the poor
contact in ECM or
manifold absolute
pressure sensor
connector.
Even if the mal-
function indicator
light illuminates,
the circuit has
returned to a nor-
mal condition at
this time.
3
CHECK OUTPUT SIGNAL FROM ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B136) No. 17 (+) — Chassis ground (
−
):
Is the voltage more than 4.5 V? Go to step 5.
4
CHECK OUTPUT SIGNAL FROM ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B136) No. 17 (+) — Chassis ground (
−
):
Does the voltage change by
shaking the ECM harness and
connector?
Repair the poor
contact in ECM
connector.
Replace the ECM.
<Ref. to FU(H4SO
2.0)-34, Engine
Control Module
(ECM).>
5
CHECK INPUT SIGNAL OF ECM.
Measure the voltage between ECM and chas-
sis ground.
Connector & terminal
(B136) No. 20 (+) — Chassis ground (
−
):
Is the voltage less than 0.2 V? Go to step 7.
6
CHECK INPUT SIGNAL OF ECM (USING
SUBARU SELECT MONITOR).
Read the data of atmospheric absolute pres-
sure signal using Subaru Select Monitor.
NOTE:
For detailed operation procedure, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4SO 2.0)(diag)-25, Subaru Select Mon-
itor.>
Is the value more than 13.3
kPa (100 mmHg, 3.94 inHg)
when shaking the ECM har-
ness and connector?
Repair the poor
contact in ECM
connector.
7
CHECK HARNESS BETWEEN ECM AND
MANIFOLD ABSOLUTE PRESSURE SEN-
SOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from manifold
absolute pressure sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between manifold
absolute pressure sensor connector and
engine ground.
Connector & terminal
(E21) No. 3 (+) — Engine ground (
−
):
Is the voltage more than 4.5 V? Go to step 8.
Repair the open
circuit of harness
between ECM and
manifold absolute
pressure sensor
connector.
EN(H4SO 2.0)(diag)-83
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
8
CHECK HARNESS BETWEEN ECM AND
MANIFOLD ABSOLUTE PRESSURE SEN-
SOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance of harness
between ECM and manifold absolute pressure
sensor connector.
Connector & terminal
(B136) No. 18 — (E21) No. 1:
Is the resistance less than 1
Ω?
Repair the open
circuit of harness
between ECM and
manifold absolute
pressure sensor
connector.
9
CHECK POOR CONTACT.
Check poor contact in manifold absolute pres-
sure sensor connector.
Is there poor contact in mani-
fold absolute pressure sensor
connector?
Repair the poor
contact in mani-
fold absolute pres-
sure sensor
connector.
Replace the mani-
fold absolute pres-
sure sensor. <Ref.
to FU(H4SO 2.0)-
26, Manifold Abso-
lute Pressure Sen-
sor.>
Step
Check
Yes
No
EN(H4SO 2.0)(diag)-84
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
G: DTC P0108 MANIFOLD ABSOLUTE PRESSURE/BAROMETRIC PRESSURE
CIRCUIT HIGH INPUT
DTC DETECTING CONDITION:
Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO 2.0)(diag)-
38, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.0)(diag)-32, PRO-
CEDURE, Inspection Mode.>.
WIRING DIAGRAM:
EN-03477
18
20
17
MANIFOLD
ABSOLUTE
PRESSURE
SENSOR
19
20
7
B21
E2
1
3
2
E21
ECM
B21
B136
B83
1 2 3 4
5 6 7 8
B138
B83
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
B136
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
E21
1 2 3
:LHD
B138 :RHD
*
*
*
: TERMINAL No. RANDOM ARRANGEMENT
AMONG 1,2,5, AND 6
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