Subaru IMPREZA 2002 Service Manual page 517

I
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
1
~
Step
CHECK OUTPUT SIGNAL FROM ECM.
1)Turn the ignition switch to ON.
2)Measure the voltage between ECM and
chassis ground.
Connector & terminal
(8134)
No.
2 (+)
-
Chassis ground (-):
!
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 connector and
engine ground.
Connector & terminal
(€4) No.
2
-
Errgine ground:
1
CHECK HARNESS BETWEEN PURGE CON
TROL SOLENOID VALVE AND ECM CON-
NECTOR.
Measure the resistance of harness between
ECM and purge control solenoid valve of har-
ness connector.
Connector & terminal
(8134)
NO.
2
-
(E4)
NO.
2:
I
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:
)
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
s the voltage more than 10 V?
s the resistance less than 10
3?
s the resistance less than 1
n?
s the resistance between 10
m d 100
n?
s the voltage more than 10 V?
Yes
iven if MIL lights
ip, the circuit has
eturned to a nor-
nal condition at
his time. Contact
vith SOA (distribu-
Dr) service.
JOTE:
nspection by DTM
;
required, be-
:ause probable
:ause is deteriora-
ion of multiple
iarts.
Iepair ground
;hort circuit in har-
less between
ICM and purge
:ontrol solenoid
ralve connector.
So to step 4.
20 to step 5.
So to step 6.
No
30 to step 2.
30 to step 3.
3epair open circui
n harness
letween ECM anc
)urge control sole
ioid valve connec
or.
\IOTE:
n this case, repai
he following:
b
Open circuit in
iarness between
ECM and purge
:ontrol solenoid
ialve connector
1
Poor contact in
:oupling connect0
822)
3eplace the purge
:ontrol solenoid
ialve. <Ref. to
>urge Control
Solenoid Valve.>
IC(S0HC)-6,
3epair open circui
n harness
letween main
'elay and purge
:ontrol solenoid
ialve connector.
EN(S0HC)-193