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Home › Subaru › 2001 › Outback Base, Standard › Repair and Diagnosis › External Pages › Different car › Section 42 (Engine Controls - Self-Diagnostics - 2.5L) › Diagnostic Tests › DTC P0604: Internal Control Module Memory Check Sum Error › Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Subaru Outback, 2003 Subaru Legacy, 2003 Subaru Impreza, 2003 Subaru Forester, and 2003 Subaru Baja. However, it is still accessible from the selected car via links, so may be relevant.

Perform basic diagnostic procedure. See BASIC DIAGNOSTIC PROCEDURE . If any DTCs other than P0604 exist, repair those DTCs first. Do not diagnose DTC P0604. If only DTC P0604 exists, check for poor contact at ECM harness connectors. Repair as necessary. If contact at ECM harness connectors is okay, replace ECM. Clear memory and perform verification procedure. See CLEARING DIAGNOSTIC TROUBLE CODES  and VERIFICATION PROCEDURE  .

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