DTC P0604 Internal Control Module Random Access Memory (Ram) Error: Wiring Diagram

Fig 1: Internal Control Module Random Access Memory (RAM) Error - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSIS PROCEDURE CHART

Step	Check	Yes	No
1 CHECK ANY OTHER DTC ON DISPLAY.	Is DTC P0604 displayed on the Subaru Select Monitor or general scan tool?	Replace the ECM. <Ref. to ENGINE CONTROL MODULE (ECM) . >	Temporary poor contact occurs.