Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.

For diagnosis, see Fig 1 and Fig 2 .

Fig 1: ECM Circuit Identification

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Fig 2: DTC P0604 Diagnostic Procedure

Courtesy of SUBARU OF AMERICA, INC.