Subaru Legacy 2003 Service Manual page 634
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Also See for Legacy 2003:
- Owner's manual (472 pages) ,
- Service manual (280 pages) ,
- Quick reference index (80 pages)
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DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1
CHECK ANY OTHER DTC ON DISPLAY.
Does the Subaru Select Monitor or OBD-II
general scan tool indicate DTC P0604?
Value
DTC P0604 indicated.
EN(H4SO)-237
ENGINE (DIAGNOSTICS)
Yes
Replace ECM.
It is not necessary
<Ref. to
to inspect DTC
FU(H4SO)-45,
P0604.
Engine Control
Module.>
No
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