Subaru Legacy 2004 Service Manual page 926

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK OPTION CODE.
2 CHECK OUTPUT SIGNAL FROM ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B134) No. 14 (+) — Chassis ground (
3 CHECK HARNESS BETWEEN PURGE CON-
TROL SOLENOID VALVE AND ECM CON-
NECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from purge con-
trol solenoid valve and ECM.
3) Measure the resistance of harness
between purge control solenoid valve connec-
tor and engine ground.
Connector & terminal
(E4) No. 2 — Engine ground:
4 CHECK HARNESS BETWEEN PURGE CON-
TROL SOLENOID VALVE AND ECM CON-
NECTOR.
Measure the resistance of harness between
ECM and purge control solenoid valve.
Connector & terminal
(B134) No. 14 — (E4) No. 2:
5 CHECK PURGE CONTROL SOLENOID
VALVE.
1) Remove the purge control solenoid valve.
2) Measure the resistance between purge
control solenoid valve terminals.
Terminals
No. 1 — No. 2:
6 CHECK POWER SUPPLY TO PURGE CON-
TROL SOLENOID VALVE.
1) Turn the ignition switch to ON.
2) Measure the voltage between purge control
solenoid valve and engine ground.
Connector & terminal
(E4) No. 1 (+) — Engine ground (
Check
Is the option code EC, EK or
K4?
Is the voltage more than 10 V? Even if the mal-
"
):
Is the resistance more than 1
M!?
Is the resistance less than 1
!?
Is the resistance 10 — 100 !? Go to step 6.
Is the voltage more than 10 V? Go to step 7.
"
):
EN(H4SO 2.5)(diag)-167
ENGINE (DIAGNOSTICS)
Yes
Go to step 2. Refer to EN(H4SO
2.0) section. <Ref.
to EN(H4SO
2.0)(diag)-66, List
of Diagnostic Trou-
ble Code (DTC).>
NOTE:
Fuel injection sys-
tem for KA and KS
model is the same
as 2.0 L model.
Go to step 3.
function indicator
light illuminates,
the circuit has
returned to a nor-
mal condition at
this time.
Go to step 4. Repair the ground
short circuit in har-
ness between
ECM and purge
control solenoid
valve connector.
Go to step 5. Repair the 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
Replace the purge
control solenoid
valve. <Ref. to
EC(H4SO 2.0)-7,
Purge Control
Solenoid Valve.>
Repair the open
circuit in harness
between main
relay and purge
control solenoid
valve connector.
No