WARNING: This page is about a different car, the 2005 Pontiac Pursuit and 2005 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Power, Ground, MIL, and DLC Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 2: Engine Data Sensors Schematic (5-Volt and Reference Bussing)
Courtesy of GENERAL MOTORS CORP.
Fig 3: Engine Data Sensors Schematic (Pressure, Temperature, and MAF/IAT)
Courtesy of GENERAL MOTORS CORP.
Fig 4: Engine Data Sensors Schematic (HO2S)
Courtesy of GENERAL MOTORS CORP.
Fig 5: Engine Data Sensors Schematic (APP and TAC)