Subaru LEGACY 2003 Service Manual page 89

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 CHECK OPERATION SOUND OF PURGE
CONTROL SOLENOID VALVE.
1) Turn ignition switch to OFF.
2) Connect test mode connector.
3) Turn ignition switch to ON.
4) Make sure that the ON/OFF operating
sound of purge control solenoid valve
occurs at about 10 Hz.
Does purge control solenoid valve produce
operating sound?
2 CHECK POOR CONTACT.
Check poor contact in ECM connector.
Is there poor contact in ECM connector?
3 CHECK HARNESS BETWEEN PURGE CON-
TROL SOLENOID VALVE AND ECM CON-
NECTOR.
1) Turn ignition switch to OFF.
2) Disconnect test mode connector.
3) Disconnect connector from purge control
solenoid valve.
4) Turn ignition switch to ON.
5) Measure voltage between ECM and chas-
sis ground.
Connector & terminal
(B134) No. 2 (+) — Chassis ground (–):
Does the measured value exceed the spec-
ified value?
4 CHECK HARNESS BETWEEN PURGE CON-
TROL SOLENOID VALVE AND ECM CON-
NECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance of harness between
ECM and purge control solenoid valve of
harness connector.
Connector & terminal
(B134) No. 2 — (E4) No. 2:
Is the measured value less than the speci-
fied value?
5 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
value?
Value
The valve produces operating
sound.
There is poor contact.
10 V
1 Ω
23 — 27 Ω
EN(H4SOw/oOBD)-87
ENGINE (DIAGNOSTICS)
Yes
Go to step 2. Go to step 3.
Repair poor con- Replace ECM.
tact in ECM. <Ref. to
FU(H4SOw/
oOBD)-42, Engine
Control Module.>
Repair battery Go to step 4.
short circuit in har-
ness between
ECM and purge
control solenoid
valve connector.
After repair,
replace ECM.
Go to step 5. Repair open circuit
in harness
between ECM and
purge control sole-
noid valve connec-
tor.
Go to step 6. Replace purge
control solenoid
valve. <Ref. to
EC(H4SOw/
oOBD)-8, Purge
Control Solenoid
Valve.>
No