Subaru 2002 IMPREZA Service Manual page 395

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step Check
1
CHECK OUTPUT SIGNAL FROM ECM.
1)Turn the ignition switch to ON.
2)Measure the voltage between ECM and
chassis ground.
Is the voltage more than 10 V?
Connector & terminal
(8137) No. 24 (+)
-
Chassis ground (-):
2 CHECK POOR CONTACT. Is there poor contact in ECM
Check poor contact in ECM connector. connector?
Yes
Go to step
3 .
Repair poor con-
tact in ECM con-
nector.
3
CHECK HARNESS BETWEEN WASTEGATE
CONTROL SOLENOID VALVE AND ECM
CONNECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from wastegate
control solenoid valve.
3)Turn the ignition switch to
ON.
4)Measure the voltage between ECM and
chassis ground.
Connector & terminal
(8137) No. 24 (+)
-
Chassis ground (-):
4 CHECK WASTEGATE CONTROL SOLE-
NOlD VALVE.
1)Turn the ignition switch to OFF.
2)Measure the resistance between wastegate
control solenoid valve terminals.
Terminals
NO. 1 -NO. 2:
5 CHECK POOR CONTACT.
Check poor contact in ECM connector.
Is the voltage more than 10 V? Repair battery
short circuit in har-
ness between
ECM and waste-
gate control sole-
noid valve
connector. After
repair, replace the
ECM. <Ref. to
FU(D0HC
Engine Control
Module.>
Is the resistance less than 1 Replace the
a?
wastegate control
solenoid valve
<Ref. to FU(D0HC
Wastegate Con-
trol Solenoid
Valve.> and ECM
<Ref. to FU(D0HC
Engine Control
Module.>
Is there poor contact in ECM Repair poor con-
connector? tact in ECM con-
nector.
TURBO)-47,
TURBO)-41,
TURBO)-47,
No
Go to step 2.
Replace the ECM.
<Ref. to FU(D0HC
Engine Control
Module.>
Go to step 4.
TURBO)-47,
Go to step 5.
Replace the ECM.
<Ref. to FU(D0HC
Engine Control
Module.>
TURBO)-47,
EN(D0HC TURBO)-I71