Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 301
EN(H4DOTC)(diag)-428
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
2
CHECK ELCM PUMP.
Operate the ELCM pump using the Subaru
Select Monitor.
NOTE:
Does the ELCM pump operate? Go to step
3
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. 3 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
the main relay and
the leak check
valve
assembly
connector
• Poor contact of
main relay connec-
tor
• Poor contact of
coupling connector
4
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 of harness between
ECM connector and the leak check valve
assembly connector.
Connector & terminal
(B137) No. 27 — (R400) No. 4:
Is the resistance less than 1 Ω? Go to step
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
coupling connector
5
CHECK HARNESS BETWEEN ECM AND
LEAK CHECK VALVE ASSEMBLY CONNEC-
TOR.
1) Measure the resistance of harness between
ECM connector and chassis ground.
Connector & terminal
(B137) No. 27 — 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.
EN(H4DOTC)(diag)-429
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
6
CHECK ELCM SWITCHING VALVE.
Operate the ELCM switching valve using the
Subaru Select Monitor.
NOTE:
Does the ELCM switching valve
operate?
7
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. 5 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
the main relay and
the leak check
valve
assembly
connector
• Poor contact of
main relay connec-
tor
• Poor contact of
coupling connector
8
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 of harness between
ECM connector and the leak check valve
assembly connector.
Connector & terminal
(B135) No. 4 — (R400) No. 1:
Is the resistance less than 1 Ω? Go to step
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
coupling connector
9
CHECK HARNESS BETWEEN ECM AND
LEAK CHECK VALVE ASSEMBLY CONNEC-
TOR.
1) Measure the resistance of harness between
ECM connector and chassis ground.
Connector & terminal
(B135) No. 4 — 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.
Step
Check
Yes
No
EN(H4DOTC)(diag)-430
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
10
CHECK EVAPORATIVE EMISSION CON-
TROL SYSTEM.
Perform drive cycle I. <Ref. to
EN(H4DOTC)(diag)-59, DRIVE CYCLE H,
PROCEDURE, Drive Cycle.>
Is DTC P2404 displayed on the
display?
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.
Step
Check
Yes
No
EN(H4DOTC)(diag)-431
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
FF:DTC P2419 EVAPORATIVE EMISSION SYSTEM SWITCHING VALVE CON-
TROL CIRCUIT LOW
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-280, DTC P2419 EVAPORATIVE EMISSION SYS-
TEM SWITCHING VALVE CONTROL CIRCUIT 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
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