WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Power, Ground, MIL, Communication
Courtesy of GENERAL MOTORS CORP.
Fig 2: 5-Volt and Low Reference Bus
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Fig 3: Engine Data Sensors - Pressure, Temperature, MAF/IAT
Courtesy of GENERAL MOTORS CORP.
Fig 4: Engine Data Sensors - HO2S
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Fig 5: Engine Data Sensors - APP, TAC
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Fig 6: Ignition Controls - Ignition System
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Fig 7: Ignition Controls - Sensors
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Fig 8: Fuel Controls - Fuel Injectors
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Fig 9: Fuel Controls - EVAP Controls
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Fig 10: Controlled/Monitored Subsystem References
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Fig 11: Secondary Air Injection (AIR) System (NU6)