Subaru IMPREZA 2002 Service Manual page 647

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Check
IS the voltage less than 3 V?
Does the voltage change more
than 10 V by shaking harness
and connector of ECM while
monitoring the value with volt-
age meter?
~~
step
CHECK OUTPUT SIGNAL FROM ECM.
1)Start the engine, and warm-up the engine.
2)Turn the ignition swtich to OFF.
3)Disconnect the connector from TCM.
4)Turn the ignition switch to ON.
5)Measure the voltage between ECM and
chassis ground.
Connector & terminal
(8134) No. 31 (+)
-
Chassis ground ( - ) :
Yes No
Go to step 2. Repair battery
short circuit in har-
ness between
ECM and TCM
connector. After
repair, replace the
ECM. <Ref. to
Engine Control
Module.>
FU(S0HC)-47,
Repair battery Contact with SOA
short circuit in har- (distributor) ser-
ness between vice.
ECM and TCM NOTE:
connector. After Inspection by DTM
repair, replace the is required, be-
ECM. <Ref. to cause probable
FU(SOHC)-47, cause is deteriora
Engine Control tion of multiple
Module.> parts.
!
CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
1)Turn the ignition switch to OFF.
2)Measure the voltage between ECM and
chassis ground.
Connector & terminal
(8134) No. 31 (+)
-
Chassis ground (-):
EN( SOH C)-323