Subaru IMPREZA 2002 Service Manual page 599

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
CHECK POOR CONTACT.
Check poor contact in ECM connector.
CHECK HARNESS BETWEEN FUEL TANK
PRESSURE CONTROL SOLENOID VALVE
AND ECM CONNECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connectors from fuel tank
pressure control solenoid valve and ECM.
3)Measure the resistance of harness between
fuel tank pressure control solenoid valve con-
nector and chassis ground.
Connector & terminal
(R68)
No.
2
-
Chassis ground:
CHECK HARNESS BETWEEN FUEL TANK
PRESSURE CONTROL SOLENOID VALVE
AND ECM CONNECTOR.
Measure the resistance of harness between
ECM and fuel tank pressure control solenoid
valve connector.
Connector & terminal
(8134)
NO.
1
-
(R68) NO. 2 :
I
CHECK FUEL TANK PRESSURE CONTROL
SOLENOID VALVE.
Measure the resistance between fuel tank
pressure control solenoid valve terminals.
Terminals
NO.
1
-
NO.
2:
I
CHECK POWER SUPPLY TO FUEL TANK
PRESSURE CONTROL SOLENOID VALVE.
1)Turn the ignition switch to
ON.
2)Measure the voltage between fuel tank pres-
sure control solenoid valve and chassis
ground.
Connector & terminal
(R68)
No. 1 (+)
-
Chassis ground (-):
Check
s there poor contact in ECM
:onnector?
s the resistance less than 10
3?
s
the voltage less than 1
R?
s
the resistance between 10
and 100 R?
s
the voltage more than 10 V?
Yes
lepair poor con-
act in ECM con-
lector.
lepair ground
;hort circuit in har-
less between
X M and fuel tank
vessure control
;olenoid valve
:onnector.
20 to step 5.
30 to step 6.
30 to step 7.
No
;ontact with SOA
distibutor) ser-
rice.
\IOTE:
nspection by-DTN
s required, be.
:ause probabk
:ause is deteriora
ion of multiple
iarts.
20 to step 4.
3epair harness
and connector.
VOTE:
n this case, repai
he following:
1
Open circuit in
iarness between
X M and fuel tank
iressure control
;olenoid valve
:onnector
1
Poor contact in
:oupling connec-
ors (R57 and B98
qeplace the fuel
lank pressure con,
rol solenoid valve.
:Ref. to
purge Control
Solenoid Valve.>
3epair harness
and connector.
VOTE:
n this case, repai
:he following:
1
Open circuit in
iarness between
nain relay and fuel
:ank pressure con.
trol solenoid valve
:onnector
D
Poor contact in
:oupling connec-
tors (R57 and 898
1
Poor contact in
nain relay connec
tor
ZC(SOHC)-S,
EN(S0HC)-275