Subaru 2002 IMPREZA Service Manual page 391

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
-
Step
CHECK OUTPUT SIGNAL FROM ECM.
1)Turn the ignition switch to ON.
2)Measure the voltage between ECM and
chassis ground.
Connector & terminal
(6137) No, 24 (+)
-
Chassis ground (-):
CHECK HARNESS BETWEEN WASTEGATE
CONTROL SOLENOID VALVE AND ECM
CONNECTOR.
1)Turn the ignition switch to OFF:
2)Disconnect the connectors from wastegate
control solenoid valve and ECM.
3)Measure the resistance of harness between
wastegate control solenoid valve connector
atid engine ground.
Connector & terminal
(8127) No, 1
-
Engine ground:
CHECK HARNESS BETWEEN WASTEGATE
CONTROL SOLENOID VALVE AND ECM
CONNECTOR.
Measure the resistance of harness between
ECM and wastegate control solenoid valve of
harness connector.
Connector & terminal
(8137) NO. 24
-
(8127)
NO.
1:
CHECK WASTEGATE CONTROL SOLE-
NOID 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 WASTEGATE
CONTROL SOLENOID VALVE.
1)Turn the ignition switch to ON.
2)Measure the voltage between wastegate
. control solenoid valve and engine ground.
Connector & terminal
(8127) No. 2 (+)
-
Engine ground ( - ) :
Check
s the voltage more than 10 V?
s the resistance less than 10
3?
s
the resistance less than 1
n?
Is the resistance between 30
m d 34 R?
Is the voltage more than 10 V?
Yes
Even if MIL lights
JP, the circuit has
,eturned to a nor-
nal condition at
his time. Contact
with SOA (distribu-
or) service.
UOTE:
nspection by DTM
s
required, be-
:ause probable
:ause is deteriora-
:ion of multiple
Darts.
3epair ground
short circuit in har-
less between
ECM and waste-
aate control sole-
ioid valve
Zonnector.
%lo to step 4.
Go to step 5.
Go to step 6.
~~
No
20 to step 2.
30 to step 3 .
Repair open circuij
in harness
between ECM and
wastegate control
solenoid valve
connector.
NOTE:
In this case, repai
the following:
Open circuit in
harness between
ECM and waste-
gate control sole-
noid valve
connector
Replace the
wastegate control
solenoid valve.
<Ref. to FU(D0HC
Wastegate Con-
trol Solenoid
Valve.>
Repair open circui
in harness
between main
relay and waste-
gate control sole-
noid valve
connector.
TURBO)-41,
EN(D0HC TURBO)-167