Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 258
EN(H4DOTC)(diag)-256
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
CH:DTC P0451 EVAPORATIVE EMISSION SYSTEM PRESSURE SENSOR/
SWITCH RANGE/PERFORMANCE
DTC DETECTING CONDITION:
• Detected when 2 consecutive driving cycles with fault occur.
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-155, DTC P0451 EVAPORATIVE EMISSION SYS-
TEM PRESSURE SENSOR/SWITCH RANGE/PERFORMANCE, 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-
Step
Check
Yes
No
1
CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
2
CHECK CURRENT DATA.
1) Turn the ignition switch to ON (engine OFF).
2) Using the Subaru Select Monitor or general
scan tool, read the value in «Atmosphere Pres-
sure» and «Mani. Absolute Pressure», and
compare them with the actual atmospheric
pressure.
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.
• To read the actual atmospheric pressure,
connect the Subaru Select Monitor or general
scan tool to the other known good vehicle.
Is the difference with the actual
atmospheric pressure 3.3 kPa
(24.5 mmHg, 1 inHg) or more?
Replace the part
that showed larger
deviation from the
actual atmospheric
pressure than the
other.
• If deviations in
value for «Atmo-
sphere Pressure»
is larger: Replace
the leak check
valve assembly.
<Ref. to EC(STI)-
19, Leak Check
Valve Assembly.>
<Ref. to EC(w/o
STI)-20, Leak
Check Valve
Assembly.>
• If deviations in
value for «Mani.
Absolute Pres-
sure» is larger:
Replace the mani-
fold absolute pres-
sure sensor. <Ref.
to FU(STI)-43,
Manifold Absolute
Pressure Sen-
sor.> <Ref. to
FU(w/o STI)-43,
Manifold Absolute
Pressure Sensor.>
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.
EN(H4DOTC)(diag)-257
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
CI: DTC P0452 EVAPORATIVE EMISSION SYSTEM PRESSURE SENSOR/
SWITCH LOW
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-157, DTC P0452 EVAPORATIVE EMISSION SYS-
TEM PRESSURE SENSOR/SWITCH LOW, 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
B97
R1
10
B92
2 3 4 5
6 7 8 9
11 12 13 14
17 18 19 20
1
10
15 16
B97
R82
1 2
3 4 5
6 7 8 9 10 11 12
B220
B83
4
1 2 3
6
5
*
B83
*
*
D27
B22
C21
B30
B4
B135
B:
B136
C:
B137
D:
14
17
15
16
13
8
R81
R82
1
5
8
7
6
4
3
R400
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
B135
B:
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
B137
D:
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
C:
1 2
4
5 6 7 8
3
R400
24
23
22
21
B220
13
14
15 16
17
27
24
25
26
20
21
22
23
29
30
31
28
32 35
33
34
37
38
39
36
40
8
9
10
11 12
1
2
5
3
4
7
6
19
18
B220
4
3
EN-09250
R5
B92
E
SBF-7
BATTERY
FUSE
(RELAY BLOCK)
MAIN RELAY
LEAK CHECK VALVE ASSY
VACUUM
PUMP
PRESSURE
SENSOR
SWITCHING
VALVE
: TERMINAL No. OPTIONAL ARRANGEMENT
EN(H4DOTC)(diag)-258
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK CURRENT DATA.
1) Turn the ignition switch to ON.
2) Read the value of «Atmosphere Pressure»
using the Subaru Select Monitor or a general
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 in «Atmosphere
Pressure» 34 kPa (255 mmHg,
10 inHg) or less?
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 POWER SUPPLY OF LEAK CHECK
VALVE ASSEMBLY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the leak
check valve assembly.
3) Turn the ignition switch to ON.
4) Measure the voltage between the leak
check valve assembly connector and chassis
ground.
Connector & terminal
(R400) No. 6 (+) — Chassis ground (–):
Is the voltage 4.5 V or more?
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ECM
connector
and the leak check
valve
assembly
connector
• Poor contact of
ECM connector
• Poor contact of
coupling connector
3
CHECK HARNESS BETWEEN ECM AND
LEAK CHECK VALVE ASSEMBLY CONNEC-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance between ECM con-
nector and chassis ground.
Connector & terminal
(B136) No. 21 — Chassis ground:
Is the resistance 1 MΩ or
more?
Repair the short
circuit to ground in
harness between
ECM connector
and leak check
valve assembly
connector.
4
CHECK FOR POOR CONTACT.
Check for poor contact of leak check valve
assembly connector.
Is there poor contact in the leak
check valve assembly connec-
tor?
Repair the poor
contact in the leak
check valve
assembly connec-
tor.
EN(H4DOTC)(diag)-259
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
CJ:DTC P0453 EVAPORATIVE EMISSION SYSTEM PRESSURE SENSOR/
SWITCH HIGH
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-159, DTC P0453 EVAPORATIVE EMISSION SYS-
TEM PRESSURE SENSOR/SWITCH HIGH, 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
B97
R1
10
B92
2 3 4 5
6 7 8 9
11 12 13 14
17 18 19 20
1
10
15 16
B97
R82
1 2
3 4 5
6 7 8 9 10 11 12
B220
B83
4
1 2 3
6
5
*
B83
*
*
D27
B22
C21
B30
B4
B135
B:
B136
C:
B137
D:
14
17
15
16
13
8
R81
R82
1
5
8
7
6
4
3
R400
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
B135
B:
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
B137
D:
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
C:
1 2
4
5 6 7 8
3
R400
24
23
22
21
B220
13
14
15 16
17
27
24
25
26
20
21
22
23
29
30
31
28
32 35
33
34
37
38
39
36
40
8
9
10
11 12
1
2
5
3
4
7
6
19
18
B220
4
3
EN-09250
R5
B92
E
SBF-7
BATTERY
FUSE
(RELAY BLOCK)
MAIN RELAY
LEAK CHECK VALVE ASSY
VACUUM
PUMP
PRESSURE
SENSOR
SWITCHING
VALVE
: TERMINAL No. OPTIONAL ARRANGEMENT
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