WARNING: This page is about a different car, the 2004 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Engine Control Module (ECM) I/O Signal (1 Of 6)
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Fig 2: Identifying Engine Control Module (ECM) I/O Signal (2 Of 6)
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Fig 3: Identifying Engine Control Module (ECM) I/O Signal (3 Of 6)
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Fig 4: Identifying Engine Control Module (ECM) I/O Signal (4 Of 6)
Courtesy of SUBARU OF AMERICA, INC.
Fig 5: Identifying Engine Control Module (ECM) I/O Signal (5 Of 6)
Courtesy of SUBARU OF AMERICA, INC.
Fig 6: Identifying Engine Control Module (ECM) I/O Signal (6 Of 6)