Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 226
EN(H4DOTC)(diag)-128
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
5
CHECK FOR POOR CONTACT.
Check for poor contact of ECM and manifold
absolute pressure sensor connector.
Is there poor contact of ECM or
manifold absolute pressure
sensor connector?
Repair the poor
contact of ECM or
manifold absolute
pressure sensor
connector.
Step
Check
Yes
No
EN(H4DOTC)(diag)-129
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
S: DTC P0108 MANIFOLD ABSOLUTE PRESSURE/BAROMETRIC PRESSURE
CIRCUIT HIGH INPUT
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-42, DTC P0108 MANIFOLD ABSOLUTE PRESSURE/
BAROMETRIC PRESSURE CIRCUIT HIGH INPUT, 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-
WIRING DIAGRAM:
• Engine electrical system, without SI-DRIVE <Ref. to WI-32, WITHOUT SI-DRIVE, WIRING DIAGRAM,
• Engine electrical system, with SI-DRIVE <Ref. to WI-48, WITH SI-DRIVE, WIRING DIAGRAM, Engine
ECM
EN-08724
6
2
8
23
1
3
2
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
A:
A29
D20
A19
2
3
1
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
3
2
1
B137
D:
B134
A:
B21
E21
E21
E2
B21
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
ES
SI
SI
ES
: WITHOUT SI-DRIVE
: WITH SI-DRIVE
MANIFOLD
ABSOLUTE
PRESSURE
SENSOR
EN(H4DOTC)(diag)-130
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK CURRENT DATA.
1) Start the engine.
2) Read the value of «Mani. Absolute Pres-
sure» using the Subaru Select Monitor or a gen-
eral scan tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedures, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4DOTC)(diag)-40, Subaru Select Moni-
tor.>
• General scan tool
For detailed operation procedures, refer to the
general scan tool operation manual.
Is the value of «Mani. Absolute
Pressure» 119.5 kPa (896.5
mmHg, 35.29 inHg) 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,
temporary open or
short circuit of har-
ness may be the
cause.
2
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) Start the engine.
4) Read the value of «Mani. Absolute Pres-
sure» using the Subaru Select Monitor or a gen-
eral scan tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedures, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4DOTC)(diag)-40, Subaru Select Moni-
tor.>
• General scan tool
For detailed operation procedures, refer to the
general scan tool operation manual.
Is the value of «Mani. Absolute
Pressure» 119.5 kPa (896.5
mmHg, 35.29 inHg) or more?
Repair the short
circuit to power in
harness between
ECM connector
and manifold abso-
lute pressure sen-
sor connector.
3
CHECK HARNESS BETWEEN ECM AND
MANIFOLD ABSOLUTE PRESSURE SEN-
SOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance of harness between
manifold absolute pressure sensor connector
and engine ground.
Connector & terminal
Models without SI-DRIVE
(E21) No. 1 — Engine ground:
Models with SI-DRIVE
(E21) No. 2 — Engine ground:
Is the resistance less than 5 Ω? Go to step
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM
connector
and manifold abso-
lute pressure sen-
sor connector
• Poor contact of
ECM connector
• Poor contact of
coupling connector
EN(H4DOTC)(diag)-131
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
4
CHECK FOR POOR CONTACT.
Check for poor contact of manifold absolute
pressure sensor connector.
Is there poor contact of mani-
fold absolute pressure sensor
connector?
Repair the poor
contact of manifold
absolute pressure
sensor connector.
Step
Check
Yes
No
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