Subaru 2002 IMPREZA Service Manual page 717

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 CHECK OUTPUT SIGNAL FROM ECM.
1)Start the engine and warm-up engine.
2)Turn the ignition switch 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
(B134) No. 31 (+) — Chassis ground ( − − − − ):
2 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
(B134) No. 31 (+) — Chassis ground ( − − − − ):
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?
EN-285
ENGINE (DIAGNOSTICS)
Yes
Go to step 2. Repair the battery
short circuit in har-
ness between
ECM and TCM
connector. After
repair, replace the
ECM. <Ref. to FU-
51, Engine Con-
trol Module.>
Repair the battery Contact with your
short circuit in har- Subaru distributor
ness between service.
ECM and TCM
NOTE:
connector. After
Inspection by DTM
repair, replace the
is required,
ECM. <Ref. to FU-
cause
51, Engine Con-
cause is deteriora-
trol Module.>
tion of
parts.
No
be-
probable
multiple