Subaru Legacy III (2000-2003 year). Service manual — part 146
EN(H4SO)-196
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AO:DTC P0458 — EVAPORATIVE EMISSION CONTROL SYSTEM PURGE CON-
TROL VALVE CIRCUIT LOW —
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• TROUBLE SYMPTOM:
• Erroneous idling
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode<Ref. to EN(H4SO)-47, OPER-
ATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-40, OPERATION, Inspection
Mode.> .
• WIRING DIAGRAM:
EN-01131
F44
B61
6
RHD
RHD
PURGE CONTROL
SOLENOID VALVE
E4
B22
E3
B47
B47
3
4
1
2
5
6
B134
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
B22
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
SBF-5
BATTERY
MAIN RELAY
1
2
3
5
4
6
29
2
1
1
2
B134
ECM
F44
1 2 3 4
5 6 7 8
E4
1 2
LHD
LHD
EN(H4SO)-197
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chas-
sis ground.
Connector & terminal
(B134) No. 29 (+) — Chassis ground (
−−−−
):
Does the measured value exceed the spec-
ified value?
10 V
Even if MI lights
up, the circuit has
returned to a nor-
mal condition at
this time. Contact
SUBARU distribu-
tor service.
NOTE:
Inspection by DTM
is required, be-
cause probable
cause is deteriora-
tion of multiple
parts.
2
CHECK HARNESS BETWEEN PURGE CON-
TROL SOLENOID VALVE AND ECM CON-
NECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connectors from purge control
solenoid valve and ECM.
3) Measure resistance of harness between
purge control solenoid valve connector and
engine ground.
Connector & terminal
(E4) No. 2 — Engine ground:
Does the measured value exceed the spec-
ified value?
1 M
Ω
Repair ground
short circuit in har-
ness between
ECM and purge
control solenoid
valve connector.
3
CHECK HARNESS BETWEEN PURGE CON-
TROL SOLENOID VALVE AND ECM CON-
NECTOR.
Measure resistance of harness between ECM
and purge control solenoid valve of harness
connector.
Connector & terminal
(B134) No. 29 — (E4) No. 2:
Is the measured value less than the specified
value?
1
Ω
Repair open circuit
in harness
between ECM and
purge control sole-
noid valve connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and purge
control solenoid
valve connector
• Poor contact in
coupling connector
4
CHECK PURGE CONTROL SOLENOID
VALVE.
1) Remove purge control solenoid valve.
2) Measure resistance between purge control
solenoid valve terminals.
Terminals
No. 1 — No. 2:
Is the measured value within the specified
range?
10 - 100
Ω
Replace purge
control solenoid
valve. <Ref. to
EC(H4SO)-7,
Purge Control
Solenoid Valve.>
EN(H4SO)-198
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
5
CHECK POWER SUPPLY TO PURGE CON-
TROL SOLENOID VALVE.
1) Turn ignition switch to ON.
2) Measure voltage between purge control
solenoid valve and engine ground.
Connector & terminal
(E4) No. 1 (+) — Engine ground (
−−−−
):
Does the measured value exceed the spec-
ified value?
10 V
Repair open circuit
in harness
between main
relay and purge
control solenoid
valve connector.
6
CHECK POOR CONTACT.
Check poor contact in purge control solenoid
valve connector.
Is there poor contact in purge control solenoid
valve connector?
There is poor contact.
Repair poor con-
tact in purge con-
trol solenoid valve
connector.
Contact SUBARU
distributor service.
NOTE:
Inspection by DTM
is required, be-
cause probable
cause is deteriora-
tion of multiple
parts.
Step
Value
Yes
No
EN(H4SO)-199
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
MEMO:
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