Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 260
EN(H4DOTC)(diag)-264
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK OUTPUT SIGNAL OF ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM connec-
tor and chassis ground.
Connector & terminal
(B137) No. 6 (+) — Chassis ground (–):
Is the voltage 10 V or more?
2
CHECK FOR POOR CONTACT.
Check for poor contact of ECM connector.
Is there poor contact of ECM
connector?
Repair the poor
contact of ECM
connector.
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 open or
short circuit of har-
ness or temporary
poor contact of
connector may be
the cause.
3
CHECK POWER SUPPLY TO PURGE CON-
TROL SOLENOID VALVE CONNECTOR.
Measure the voltage between purge control
solenoid valve connector and engine ground.
Connector & terminal
(E4) No. 1 (+) — Engine ground (–):
Is the voltage 10 V or more?
Repair the power
supply circuit.
4
CHECK HARNESS BETWEEN ECM AND
PURGE CONTROL SOLENOID VALVE CON-
NECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
purge control solenoid valve.
3) Measure the resistance between the purge
control solenoid valve connector and engine
ground.
Connector & terminal
(E4) No. 2 — Engine ground:
Is the resistance 1 MΩ or
more?
Repair the short
circuit to ground in
harness between
ECM connector
and purge control
solenoid valve
connector.
5
CHECK HARNESS BETWEEN ECM AND
PURGE CONTROL SOLENOID VALVE CON-
NECTOR.
Measure the resistance of harness between
ECM connector and purge control solenoid
valve connector.
Connector & terminal
(B137) No. 6 — (E4) No. 2:
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 purge control
solenoid
valve
connector
• Poor contact of
coupling connector
EN(H4DOTC)(diag)-265
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
6
CHECK PURGE CONTROL SOLENOID
VALVE.
1) Remove the purge control solenoid valve.
2) Measure the resistance between purge con-
trol solenoid valve terminals.
Terminals
No. 1 — No. 2:
Is the resistance 10 — 100 Ω? Repair the poor
contact of purge
control solenoid
valve connector.
Step
Check
Yes
No
EN(H4DOTC)(diag)-266
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
CN:DTC P0459 EVAPORATIVE EMISSION SYSTEM PURGE CONTROL VALVE
CIRCUIT HIGH
DTC DETECTING CONDITION:
• Detected when 2 consecutive driving cycles with fault occur.
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-170, DTC P0459 EVAPORATIVE EMISSION SYS-
TEM PURGE CONTROL VALVE CIRCUIT HIGH, Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
Improper idling
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
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:
B21
1 2 3 4 5 6 7 8 9 10 11
12 13 14 15 16 17 18 19 20 21 22
23 24 25 26 27 28 29 30 31 32 33
34 35
42 43
36 37 38 39
48 49 50 51 52 53 54
40 41
44 45
46 47
E52
E4
1 2
B3
D15
D6
E2
B21
44
11
4
8
E4
2
1
E52
2
1
R68
2
1
B135
B:
R57
R15
10
11
R1
B97
R2
B98
7
10
R68
1 2
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
R57
B97
1 2
3 4 5
6 7 8 9 10 11 12
EN-09251
B98
2 3 4 5
6 7 8 9
11 12 13 14
17 18 19 20
1
10
15 16
B220
24
23
22
21
B220
4
3
B137
D:
SBF-7
E
FUSE
(RELAY BLOCK)
MAIN RELAY
BATTERY
PRESSURE CONTROL
SOLENOID VALVE ASSY
PURGE CONTROL
SOLENOID VALVE 2
PURGE CONTROL
SOLENOID VALVE 1
EN(H4DOTC)(diag)-267
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK HARNESS BETWEEN ECM AND
PURGE CONTROL SOLENOID VALVE CON-
NECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
purge control solenoid valve.
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM connec-
tor and chassis ground.
Connector & terminal
(B137) No. 6 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Repair the short
circuit to power in
the harness
between ECM con-
nector and purge
control solenoid
valve connector.
2
CHECK PURGE CONTROL SOLENOID
VALVE.
1) Turn the ignition switch to OFF.
2) Measure the resistance between purge con-
trol solenoid valve terminals.
Terminals
No. 1 — No. 2:
Is the resistance less than 1 Ω? Replace the purge
Repair the poor
contact of ECM
connector.
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