Subaru Legacy 2003 Service Manual page 2027

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
6 CHECK OUTPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B137) No. 29 (+) — Chassis ground ( − − − − ):
Does the measured value exceed the specified
value?
Step
EN(H4DOSTC)-188
Value
10 V
Yes
Repair the battery Repair the poor
short circuit in har- contact in ECM
ness between connector.
ECM and front
oxygen (A/F) sen-
sor connector.
After repair,
replace the ECM.
<Ref. to
FU(H4DOSTC)-
40, Engine Con-
trol Module.>
No