Subaru Legacy 2002 Service Manual page 1540

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
1 CHECK OUTPUT SIGNAL FROM ECM.
1) Start engine, and warm-up the engine.
2) Turn ignition switch to OFF.
3) Disconnect connector from TCM.
4) Turn ignition switch to ON.
5) Measure voltage between ECM and chas-
sis ground.
Connector & terminal
(B136) No. 14 (+) — Chassis ground
(−):
2 CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
1) Turn ignition switch to OFF.
2) Measure voltage between ECM and chas-
sis ground.
Connector & terminal
(B136) No. 14 (+) — Chassis ground
(−):
Step
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 voltage meter?
EN(H6)-333
Check Yes
Go to step 2.
Repair battery
short circuit in
harness between
ECM and TCM
connector. After
repair, replace
ECM. <Ref. to
FU(H6)-47,
Engine Control
Module.>
Engine (DIAGNOSTICS)
No
Repair battery
short circuit in
harness between
ECM and TCM
connector. After
repair, replace
ECM. <Ref. to
FU(H6)-47,
Engine Control
Module.>
Contact with your
Subaru distributor
service.
NOTE:
Inspection by
DTM is required,
because probable
cause is deterio-
ration of multiple
parts.