Subaru Legacy III (2000-2003 year). Service manual — part 147
EN(H4SO)-200
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AP:DTC P0459 — EVAPORATIVE EMISSION CONTROL SYSTEM PURGE CON-
TROL VALVE CIRCUIT HIGH —
• 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)-201
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to OFF.
2) Connect test mode connector at the lower
portion of instrument panel (on the driver's
side), to the side of the center console box.
3) Turn ignition switch to ON.
4) While operating purge control solenoid
valve, measure voltage between ECM and
chassis ground.
NOTE:
Purge control solenoid valve operation can be
executed using Subaru Select Monitor. For pro-
cedure, refer to “Compulsory Valve Operation
Check Mode”. <Ref. to EN(H4SO)-48, Compul-
sory Valve Operation Check Mode.>
Connector & terminal
(B134) No. 29 (+) — Chassis ground (
−−−−
):
Does the measured value exceed the spec-
ified value?
10 V
Even if MI light up,
the circuit has
returned to a nor-
mal condition at
this time. In this
case, repair poor
contact in ECM
connector.
2
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
3
CHECK POOR CONTACT.
Check poor contact in ECM connector.
Is there poor contact in ECM connector?
There is poor contact.
Repair poor con-
tact in ECM con-
nector.
Replace ECM.
<Ref. to
FU(H4SO)-45,
Engine Control
Module.>
4
CHECK HARNESS BETWEEN PURGE CON-
TROL SOLENOID VALVE AND ECM CON-
NECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from purge control
solenoid valve.
3) Turn ignition switch to ON.
4) 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
Repair battery
short circuit in har-
ness between
ECM and purge
control solenoid
valve connector.
After repair,
replace ECM.
<Ref. to
FU(H4SO)-45,
Engine Control
Module.>
5
CHECK PURGE CONTROL SOLENOID
VALVE.
1) Turn ignition switch to OFF.
2) Measure resistance between purge control
solenoid valve terminals.
Terminals
No. 1 — No. 2:
Is the measured value less than the speci-
fied value?
1
Ω
Replace purge
control solenoid
valve <Ref. to
EC(H4SO)-7,
Purge Control
Solenoid Valve.>
and ECM <Ref. to
FU(H4SO)-45,
Engine Control
Module.>
EN(H4SO)-202
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
6
CHECK POOR CONTACT.
Check poor contact in ECM connector.
Is there poor contact in ECM connector?
There is poor contact.
Repair poor con-
tact in ECM con-
nector.
Replace ECM.
<Ref. to
FU(H4SO)-45,
Engine Control
Module.>
Step
Value
Yes
No
EN(H4SO)-203
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
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