WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Module Power, Ground, Serial Data And MIL Schematics
Courtesy of GENERAL MOTORS CORP.
Fig 2: Engine Data Sensors Schematics - 5-Volt And Low Reference
Courtesy of GENERAL MOTORS CORP.
Fig 3: Engine Data Sensors Schematics - Pressure, Temperature And VSS
Courtesy of GENERAL MOTORS CORP.
Fig 4: Engine Data Sensors Schematics - MAF And Extended Brake Travel Switch