DTC P0604 - Internal Control Module Random Access Memory (Ram) Error -

DTC DETECTING CONDITION:
- Immediately at fault recognition
- GENERAL DESCRIPTION < Ref. to DTC P0604 - INTERNAL CONTROL MODULE RANDOM ACCESS MEMORY (RAM) ERROR - , Diagnostic Trouble Code (DTC) Detecting Criteria. >
TROUBLE SYMPTOM:
- Engine does not start.
- Engine stalls.

CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode < Ref. to OPERATION , CLEAR MEMORY MODE > and INSPECTION MODE < Ref. to OPERATION , INSPECTION MODE. >

WIRING DIAGRAM:

Fig 1: Internal Control Module Random Access Memory Wiring Diagram
Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK ANY OTHER DTC ON DISPLAY.	Does the Subaru Select Monitor or general scan tool indicate DTC P0604?	Replace the ECM. < Ref. to ENGINE CONTROL MODULE (ECM) . >	A temporary poor contact.