Subaru Legacy 2004 Service Manual page 1440

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AT:DTC P0600 SERIAL COMMUNICATION LINK
NOTE:
For the diagnostic procedure, refer to LAN system.
AU:DTC P0604 INTERNAL CONTROL MODULE READ ACCESS MEMORY
(RAM) ERROR
NOTE:
For the diagnostic procedure, refer to DTC P0607. <Ref. to EN(H4DOTC)(diag)-152, DTC P0607 CONTROL
MODULE PERFORMANCE, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
AV:DTC P0605 INTERNAL CONTROL MODULE READ ONLY MEMORY (ROM)
ERROR
NOTE:
For the diagnostic procedure, refer to DTC P0607. <Ref. to EN(H4DOTC)(diag)-152, DTC P0607 CONTROL
MODULE PERFORMANCE, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
EN(H4DOTC)(diag)-151
ENGINE (DIAGNOSTICS)