Subaru 2002 IMPREZA Service Manual page 929

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 CHECK OPERATION SOUND OF PURGE
CONTROL SOLENOID VALVE.
1)Turn the ignition switch to OFF.
2)Connect the test mode connector at lower
portion of instrument panel (on driver's side).
3)Turn the ignition switch to ON.
4)Make sure that the ON/OFF operating sound
of purge control solenoid valve occurs at about
10 Hz.
2 CHECK POOR CONTACT.
Check poor contact in ECM connector.
3 CHECK HARNESS BETWEEN PURGE CON-
TROL SOLENOID VALVE AND ECM CON-
NECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the test mode connector.
3)Disconnect the connector from purge control
solenoid valve.
4)Turn the ignition switch to ON.
5)Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B134) No. 2 (+) — Chassis ground (–):
4 CHECK HARNESS BETWEEN PURGE CON-
TROL SOLENOID VALVE AND ECM CON-
NECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ECM.
3)Measure the resistance of harness between
ECM and purge control solenoid valve of har-
ness connector.
Connector & terminal
(B134) No. 2 — (E4) No. 2:
5 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:
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
Does the purge control sole-
noid valve produce operating
sound?
Is there poor contact in ECM
connector?
Is the voltage more than 10 V? Repair the battery
Is the resistance less than 1
Ω?
Is the resistance between 23
and 27 Ω?
Is the voltage more than 10 V? Go to step 7.
EN(w/oOBD)-95
ENGINE (DIAGNOSTICS)
Yes
Go to step 2. Go to step 3.
Repair the poor Replace the ECM.
contact in ECM. <Ref. to FU(w/
oOBD)-48, Engine
Control Module.>
Go to step 4.
short circuit in har-
ness between
ECM and purge
control solenoid
valve connector.
After repair,
replace the ECM.
Go to step 5. Repair the open
circuit in harness
between ECM and
purge control sole-
noid valve connec-
tor.
Go to step 6. Replace the purge
control solenoid
valve. <Ref. to
EC(w/oOBD)-8,
Purge Control
Solenoid Valve.>
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
main relay and
purge control sole-
noid valve connec-
tor
• Poor contact in
main relay con-
nector
• Poor contact in
coupling connector
(B22)
No