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

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

Courtesy of SAAB-SCANIA OF AMERICA, INC.

CHECK ANY OTHER DTC ON DISPLAY 

Does the Vehicle Diagnostic Interface or OBD-II general scan tool indicate DTC P0604? 

YES 

Replace the ECM.

NO 

A temporary poor contact.